. P A R T

A

3

S E R I E S

L A

k 0 0

L A

4 0 0

L A P

4o o

L A L

4 0 0

L A

490

L A P

490

s-ER

v

I

c

E

D E P A R T 1.1 E N T

M A NU E1 D' ATELIER WORKSHOP

-

~

MANUAL

I

I - S P E C I F I C A T I O N S

ENGINES

LA

400

LAP 490

WA.IN ENGINE S P E C I F I C A T I O N S

S e r i e s Engine B o r e S t r o k e D i s p . M e t r i c HP RPM M a x . Torque F u e l U t

Mm.

-

Ph.

Cu.Cm.

DIN Std.

LA 400

80

80

402

LA 400 sn

80

80

LA400 LAP400

80

LAP400

I(gs.

-

Icgm. /RPM

--

10

3000

2.7/2100

Gas.

48

402

10

30%

2.7/2100

Gas.

48

80

402

8.3

3000

2.3/2300

Ker.

48

80

80

402

8.3

3000 2.3/2300

Ker.

48

LAL400

80

80

402

6.5

22M3

2.3/1750

Gas.

48

LA 490

88

80

487

12

3000 3.3/1800

Gas.

48

490

88

80

487

12

3000 3.3/1800

Gas.

48

88

80

487

10

3000 2.7/2300

Ker.

48

LA23490 88

80

487

10

3000

Ker.

48

sn

LA

LA49 0

sn

LAP490

2.:/2300

sn

N.B.

Engines m a r l a d 'fsn" have a n t i c l o c k r u i s e r o t a t i o n , f lyrihe e 1

.

U n l e s s o t h e m i s e indicated, apply t o a l 1 m o d e l s .

3

.

looking at

engine r e p a i r i n g i n s t r u c t i o n s

i

i

2

series~LAA&

MANUEL D'ATELIER ~~

WORKSHOP MANUAL

I1

-

MA IN T E N A N C E

ITEM

OPEUTION

FILTEB CLEANING

S

C H E DU L E

INTERVAL BASIS: DAILY

-

IIRS.

AIR

FUEL

CRANKCASE BREATHER AND CYLINDER FINS' FUEL TANK SPARX PLUG BEAD

OIL LEVEL

AIR CLEANER

SUb!P+++

CHECICING VALVES CLEARANCE

BREAImR CONTACTS CLEARANCE AIR CLEANER G A S I W

REPLACEMENT

OIL

AIR CLEANER++ SUMP'"

SPARK PLUG

OVERHAUL

)

PARTIAL++++ GENERAL

+Under particularly severe operating conditions, every day. ++Under extremely dusty conditions, every 4/5 hours. +++Use Grade SAE 20 i{Oil below IOOC; SAE 30 f r o n i 10°C. to 30°C. and SAE 50 above 30°C. '+++Includes : checlcing of cylinder, rings, valves, guides, springs - valve seats grinding - replacement of brealcer contacts. CAPACITIES Standard fuel tank, liters: Type LA - LAL 400/490 Type LAP 400/490

Gasoline 6.0 ,-

0.4

O i l sump, liters:

1,25

A i r cleaner oil b o w l t liters:

0.06

ICerosene

5-6

"For special air cleaners stick to Lornbardini's instructions. 4

MANUEL D'ATELIER

Ceri-es LA 400-

~

WORKSHOP M A N U A L 1 1 1 - D I S A S S E M B L Y

I N S T R U C T I O N S

ENGINE INSTALLATION B o l t e n g i n e t o s t a n d from e x h a u s t s i d e . D I SASSEMBLING

Disassemble a c c e s s o r i e s and e x t e r n a l p a r t s . To a v o i d any damage, c a r r y o u t d i s a s s e m b l i n g job r v i t b folio.rving special tools : Fig.

1

- P u l l e r R70.3595.26 f o r f l y w h e e l .

Gear t r a i n h o u s i n g c a n b e d i s a s s e m b l e d w i t h o u t removing c y l i n d e r h e a d . In t h i s c a s e p f u l l y l o o s e n roclcer a r m a d j u s t i n g s e r e w s b e f o r e d i s a s s e m b l i n g h o u s i n g t o p r e v e n t deforming p r o $ e i p t i o n . t u b e of pnsh

rods ,.-+d::

C r a n l c s h a f t u i u s t b e pulled out; complete with ball. bea-ring o n I l y wheel s i d e , p r o c e d i n g as f o l i o r i s :

-

remove 'ball b e a r i n g r e t a i n s r from i n s i d e (Fi,liiie ICer o sene

LA 400

LA.

Jets a r e for standard oil bath air cleaners. Iierosene t w e carburetor has another diffuser in carburetor eiboru rig1i.L at the idle jet position. After assemblirig carburetor, checl: that there are n o l e a l c s f r o m fuel lines and unions. Ii'UEL FEEDING PUbP

Pump i s installed only on request. It i s a diaplrragm type actuated by' camshaft tlrougli a push r o d Check condition of diaphragni and two valves, and replace defective parts. IGNITION CIRCUIT It i s a high voltage alternator type witith rotating inductor a d fixed armature coil. The inductor is a magnet set in a seat on the flywheel periphery. The armature i s formed by a coil fixed o n the cranlccase and rround around a core made by a paclc of magnetic sheets having two rvindings: l o r i a m i high voltage.

Fig. 37

-

Plechanical brealcer ignition.

15

I

MANUEL .D'ATELIER

S e r i e s L A 400---~

~

~

~~~

~

WORKSHOP M A N U A L The magnet r o t a t i o n c a u s e s a f l o w v a r i a t i o i i i n t h e c o i l , whicli c r e a t e s a l o w v o l t a g e c u r r e n t i n t h e primary winding. This p r o p e r l y i n t e r r u p t e d c u r r e n t d e t e r m i i i e s i n t h e s e c o n d a r y windi n g a v o l t a g e a m p l i f i c a t i o n c a p a b l e o f c a u s i n g a sparlc b e t w e e n spark plug e l e c t r o d e s : The c u r r e n t i n t e r r u p t i o n i s o b t a i n e d as folloris:

i

With m e c h a n i c a l brealcer: B r e a l c e r c o n t a c t s a r e a c t u a t e d by a C a m O n t h e c r a n l c s h a f t t h r o u g h a p u s h rod w i t h a c o n d e n s e r i n parallel. ifitli transist'or: It has n o moving c o n t a c t s and i t i s h o u s e d i n s i d e t h e c o i l c o v e r , embedded i n a p r o t e c t i v e i n s u l a t i n g compound. It i s formed b y t h r e e c i r c u i t s : a b a s e c i r c u i t i n c l u d i n g t h e c o i l and t h e c u t - o f f t r a n s i s t o r , and two p i l o t s : one o p e r a t i n g a t a l o w r . p . m . and t h e o t h e r a t a liigli r . p . m . The m e c h a n i c a l b r e a k e r i g n i t i o n c o i l and magnet a r e n o t i n - t e r c h a n g e a b l e r i i t h t h e same p a r t s for t h e t r a n s i s t o r i z e d i g n i t i o n . The t r a n s i s t o r i z e d i g n i t i o n m a y b e i d e n t i f i e d from t h e standard t y p e for d i f f e r e i i t s h a p e and s i z e o f c o i l c o v e r . P a r t s i n F i g . 38: 1 Sparlc p l u g ; 2 Stop push b u t t o n ; 3 5 - Coil; 6 T r a n s i s t o r box.

-

-

F i g . 38

-

-

- F+F&ieel;

4 - Nagnet;

Transistorized ignition.

Checlcs Coil:

Checlc i t r i i t l i a magnetonieter and r e p l a c e i t i f defectb-ve.

D a t a for e l e c t r i c riindinns: R e s i s t a n c e , 01un

Standard

Primary Secondary

0.30 2500/Lt500

Transis t o r i z e d 0.22 7500/7700

I n s u l a t i o n for s t a n d a s d c o i l i s red; t h e oiie f o r t h e t r a n s i s t o r i z e d c o i l i s g r e e n or gray. Checlc that i n s u l a t i o n i s n e i t h e r craclced n o r b r o k e n . Checlc c o n n e c t i o n of high v o l t a g e c a b l e o n c o i l and s p a - l c p l u g . For s t a i i d a r d i m i t i o n o n l y : Clieclc t h a t i i i r e b e t i i e e i i c o i l aiid b r e a l c e r c o n t a c t s i s n o t grounded or b a d l y i i i s u l a t e d .

F i g . 39

- Chedcing c o i l . ,

i

.

Nagnet: Magnet e f f i c i e n c y m a y d r o p i f f l j v h e e l . u n d e r g o e s r e p e a t e d laioclcs or i f i t becomes t o o h o t . C a r r y o u t c h e c k a$ f o l l o r i s ( F i g . 40) : P l a c e s l i d e r . . ' o f T o o l R972701 h o r i z o n t a l l y a t l e v e 1 w i t h n o t c l i (a) f o r s t a n d a r d i g n i t i o n , and n o t c h ( b ) f o r a t r a - q s i s t o r i z e d i g n i t i o n and checl; i f i t i s a t t r a c t e d by magnet. F i g . .40

- Checlcing magnet

R e m a m e t i ' z a t i o n : if magnet i s d e m a g n e t i z e d , liave i t r e m a g n e t i z e d by an E l e c t r i c a l S e r v i c e S t a t i o n e q u i p p e d r i i t l i a m a g n e t i z i n g d e v i c e having tlie f o l l o r i i n g c h a r a c t e n - i s t i c s : i

16

Nagnetomotive f o r c e lifagnetic f l u x Pole m i n i m w n d i a m e t e r

3500 Ampere turns 80/85 G a u s s 80 mm.

\

MANUEL D'ATELIER

~~

eri e

~I--~~~oo=;

LA 4

WORKSHOP MANUAL ~

\

-

Apply flywlieel t o d e v i c e . i n s e r t betrveen f l y 9 h e e l f i n s , o p p o s i t e magnet, shaped s o f t i r o n rvedges s o ad t o c l o s e t h e s p a c e between f i n s (Fig. 4 1 ) . F o r c o u n t e r c l o c k w i s e r o t a t i o n e n g i n e s do t h e same t h i n g t h e o t h e r r v a y around.

- T i g h t e n f l y w h e e l betrueen p o l e s h o e s .

-

Connect e l e c t r i c c o n t a c t t o m a g n e t i z e r f o r a f e w seconds a n d r e p e a t o p e r a t i o n trvo or t h r e e t i m e s .

F i g . 41 - Remagnetizing f l y w h e e l . Condenser: Replace c o n d e n s e r i n c a s e of brealcages o r b u r n up. This c o n d i - t i o n c a n b e d e t e c t e d b e c a u s e c o n t a c t s wear o u t q u i c k l y and i g n i t i o n s t a g g e r s . Sparlc p l u g s : See t a b l e below f o r r i g h t s p a r l c plugs:

LAP -

LA -.LAL

BRAND Elarelli

cw

Bosch ChamRion

W

95 T1

UL

15 Y

Ii L G

F

50

cv

50 NI

U

h5 TI

150 N

-

Clean e l e c t r o d e s r v i t h r i i r e brush and compresseci a i r , zuid r e s e . t gap t o 0 . S mm. Replace s p a r l c p l u g s if t h e y e-xhibit t r a c a s o? brealcage o n t h e porc e l a i n insiilator o r e x c e s s i v e ivear o n groiilid !::iectrode. i n my c a s e , r e p l a c e them a f t e r 300 h o u r s of o p e r a t i o r i .

-

F i g . 42

Checlung e l e c t i - o d e g a p .

ELECTRICAL EQUIPMENT

The most common equipment - s u p p l i e d on r e q u e s t )

BOSCH S t a r t e r g e n e r a t o r : J(R) 14V Features:

1 Metric

-

HP a t 750 r . p . m .

90 Tiatts

llA-32,

-

12V,

5s:

IPS.

startiiig motor generator

BOSCH Voltage r e g u l a t o r : Z AD 1 4 V - 11A. B a t t e r y p r e s c r i b e d : 27 A h DUCATI A l t e r n a t o r :

Volts

6

6 mixed + 6 mixed +

+i i.i t l i I

Sys t em

Current

4o

liglit ing

a.C.

40

ligliting

a.C.

18

b a t t e r y recharging"

d.c.

liatts

r e c t i f i e r and r e g u l a t o r s e t .

"BatteF i g . 43

-

p r e s c r i b e d : 18 A h . E l e c t r i c a l system with s t a r t e r g e n e r a t o r .

77

MANUEL

D'ATELIER

Series LA-W0-p

--

WORKSHOP M A N U A l

Starter generator and voitage r e w i a t o r

1

F o r overliauling alrvays contact a Bosch Electrical Service Station. Maint enanc e : Adjust belt tension. Under thumb pressure, belt must depress about 1 cm. (Fig. 44). - Check brushes condition every 2000 houixi, removing baclc protection clamp, talcing out brushes and cleaning housing. Length of new brushes 23 mm. iiear limit 12 mm. Even if only one of the brushes is under limit, replace a l l . - Check spring tension with dynamometer. Norma1 valve: 85O/lOO gms. Fig. 44 - Checlung belt tension. Tests and checlcs Load test of starting generator depends on battery condition. Malce a circuit as in Fig. 45 with a 20 Amp. d.c. ammeter. iiith a haif charged battery and lines connected for a 5 0 Watt absorption, current output should be 6 - 10 Amp. If under, verify if defect is in voitage reguiator. if necessary, repiace regulator aild repeat test. Check for positive ground contact in regulator, rvhich rvould otherwise cause immediate burn up of fuse inside regulator upon starting. in such case, restore contact and replacc fuse with 0.5 mm. dia. copper conductor. If there are no changes, the defect i s probably in the startillg generator which should be checlced on the electrical test bench.

1

-

Fig. 45 Checlcing starting generator load current. Alt ernator Fixed armature and rotating inductor type rvith permanent magnetoes. Test and checlc Checlc for perfect connection and ground insulation of stator Winding. Do not change length or cross section of rvires ( 1 . 5 mm.2).

2 Connect bulbs for a total absorption of 36-40 iiatts and bring en&.ne specd to 3 0 0 0 r.p.m. Voltage must be approximately 7 Volts, obviously shown by a good brightness o r the bulbs. Disconnect rvire from battery positive termina1 and connect a 5/10 Amp. d.c. ammeter. Sliould there b e no current, checlc fuse inside voltage regulator. Parts in Fig. 46: 1 Battery; 2 Rotor; 3 - Stator; 4 - Back lights; 5 Voltage regulator; 6 - Ilorn; 7 - Switch; 8 - Connecting plate.

-

-

1

-

-

Fig. 46 Lighting alternator with battery recharging. System rvithout battery recharging Carry out only first test made in above system. Alternator feeds bulbs directly so voltage is regulated b y load applied, rvhich must not exceed 40 Tiatts. A higher load causes little brightness in the bulbs whereas a loiver load raises voltage thus shortening bulbs life. Parts in Fig. 47: 1 Rotor; 2 - Stator; 3 Baclc lights; 4 Srvitch; 5 - Connecting plate. Fig. 47 - Lighting alternator rvith no batte- recharging.

-

18

-

-

I

MANUEL D'ATELIER

~

~

~

~

~

Series-~LAL4OO

WORKSHOP M A N U A L V - A S S E M B L Y

A N D

T U N I N G

INTRODUCTION

After checlcing p a r t s according t o i n s t r u c t i o n s outlined i n preceding chapter, assemble engiiie according t o sequence s p e c i f i e d . This r i i l l prevent drarubaclcs and damages. Before assembling p a r t s , clean them rvith Icerosene and dry them ruith coinpressed a i r . Lubricate moving p a r t s t o prevent seizure upon f i r s t s t a r t i n g . Use c l e a n o i l t o l a y a l u b r i c a t i n g coat on p a r t s . A t each reassembling replace gaslcets ma o i l seals. U s e torque wrenches f o r correct b o l t t i g h t e n i n g . OIL SEALS

)

Clieclc t h a t edges have not l o s t t1iei.r e l a s t i c i t y and have n o craclcs., Otherrvise, replace them not f o r g e t t i n g , t o :, - C l e a i and l u b r i c a t e o i l s e a l s bore; - I n s t a l l seals ruith a b u f f e r with l i p s f a c i n g i n . S e a l s sliould be mouiited i n cranlccase a t cranlcshaft end and i n gear t r a i n case cover. Dimensions a r e : 50 YL 20 x I O m . Crankc ES e ;: i d e G e a r t r a i n side 35 x 2 : >: 7 mm. CRANICSILWT iDID FLMWEEL

)

Prepaiation: Assemble centrifuga1 o i l b a f f l e matching i t s h o l e s with those i n cranlcsliaft. Heat timing gear i n oven t o 130°C. ancl inser-t i t i n s h a f t with key s e a t matching lcey. Znstall ball b e a r ing, pressiiig i n s i d e r a c e . DistLnce between ball bearings edge and gear t r a i n 1nus.t b e 135.0/135.1 mm. Assembling: Place cranlcsliaft i n cranlccase. Do not c'umage s e a l ring. R e s t outside sace o f bearing against cianlccase r m l l . Bearing should b e secured rvith locking p i n on rihich a s m a l l r u b b e r r i n g shouid b e slipped f r o m the i n s i d e . Tighten nut t o 3 ICgci. (Fig. h 8 ) . I n s t a l l a i r shsoud, i n s t a l l flyrvheel o n cranksliaft i v i t h lceyway matcliing key. Tighten loclcing nut t o 35 Kgm. To prevent r o t a t i o n during tightening operation, use a clamp o r s i m i l a r device. Fig. 48

-

Cranlrshaft ball bearing loclcing p i n .

PISTON AND CyLIhQER A s s e i n b l e p i s t o n , connecting rod, p i s t o n pin and connec.ting z m d bearing. I n s t a l l p i s t o n p i n with s l i g l i t hand pressure and secure i t with snap r i n g s . Assembling d i r e c t i o n of p a r t s i s immaterial. i n s t a l l connecting rod cap and bearing, matching marlcs on cap and b i g end (Fig. 4 9 ) . Torque nuts- t o 3 IQm. and secure with l o c l q l a t e s .

Fig.

-

Connecting r o d reference marks.

i n s t a l l r i n g s o11 p i s t o n with gap o f f s e t h a l f t u r n one w i t h r e s p e c t t o the other ( F i g . 5 0 ) . Fig. 50

-

Rings p o s i t i o n .

19

MANUEL D'ATELIER

Seriec LA-400-

WORKSHOP MANUAL

hit a yolce or a pair of pliers under piston to support it (Fig.51). insert a shim on cranlccase and mount cylinder on piston.Tlle lorver edge of the cylinder being beveled, no comprcssor is necessary for rings

i

.

Check with ruler that head of piston at TDC is leve1 rvith cylinder edge o r just 0.5 mm. over it

.

Fig.

51

-

Installing cylinder and checlung piston height.

GEAR TRAIN IIOUSING

Mesuiting NadelLa-DL ,3025 and Durlcopp RNAFF 3 0 x li0 x 26 (old style) needle bearings. Lubricate bearing seat and introduce it with Tool R~O-3595-46 using 30 mm. hub (Fig. 52). Pressure should be applied on outside edge without lmoclcs from the punched side. Center bearing in bore with utmost care. After assembling, bearings must not protrude from housing. For old type housings, bearing mounting operation is outlined in Pragraph "Cranlcshaft" (Chapter of Overhauls) Fig. 52 - Installing needle bearing.

\

.

Centrifuga1 governor: Slip in governor lever shaft setting its exact position through dorveled end pin which engages lever groove (Fig. 53). - Center interna1 lever on hole o i governor shaft housing and secure it rdth a bolt. - Elount governor controlbox and gasket, connecting spring at end of ievers (Fig. 53). - Mount complete governor gear in housing, position it in seat ruith the shaft and secure it from outside rdth an oil seal riasher and bolt. Checlc smoothness of gear and plunger, and mount b o r i l . Fig. 53

-

EIounting lever and governor.

TIMING With piston at TDC install camshaft and journal, matching reference marlcs on gears. If there are n o marlcs, install camshaft ruith cams uprvards s o that - after housing is mounted - tappets r u i l l be at same height. Insert tappets in housings, the short one (intalce) in guide near cylinder, and the long one (exhaust) in external guide.

Fig. 54 20

-

Timing.

1

.

M A N U E1 D'ATELIER ~.

~~

.

Series LA~~400-1,L-

WORKSHOP M A N U A L

.

:

M o u n t i n g gear t f a i n housing o n cranlccase

\

- Momit hoiising' w i t h ' gaslcet o n c r a n k c a s e . - T i g h t e n screivs t o 3 I i g m .

-

Mount c o v e r complete with o i l s e a l r i n g 01; h o u s i n g with p u s h . rod f o l l o r v e r on c o n t a c t brealcer s i d e ( o n l y r v i t h s t c u ù a r d i g n i tion).

m a c t p o s i t i o n of Fig.

-

55

-

C e n t e r i n g c o v e r on gear traili h o u s i n g .

I i i s t a l l valves. hfount s p r i n g s , r r i t h d i s c on b o t t o m and p l a t e o n t o p . Compress s p r i n g s w i t h T o o l R70-1460-06 (Fig. 56).

F i g . 56

-

-

c o v e r i s d e t e r m i n e d by t a p e r p i n c e n t e r i n g .

-

and i n s e r t half

cones.

I n s t a i i i n g springs.

Checlc s p r i n g s p o s i t i o n and vaives smoothness.

I n s t a l l r o c k e r arms shaft aiid o i l s e a l r i n g , roclcer arms and t T I 0 s i d e shims (LA 11.00) or a c e n t r a 1 s h i m b e t v e e i i two roclcer arms

(u490).

O i l seal r,ing. s h o u l d l o c k t o w a r d s roclcer m m s shaft i n t r o d u c t i o n

side.

o

I

-

-

On o p p o s i t e s i d e checlc e x p a n s i o n p l u g t i g h t n e s s and if n e c e c sary - seal w f t h m e t a l , s e a l i n g compound. If c y l i n d e r head has s t e e l roclcer &%I s h a f t , r e p l a c e i t r r i t h a b r o n z e one. Mount head on c y l i n d e r with m e t a l g a s k e t , m a l c i n g c e r t a i n t h a t p u s h r o d s a r e c r o s s e d . In o t h e r words, tlie i n t a k e rod r e s t s on t a p p e t c l o s e s t t o c y l i n d e r and d r i v e s l e f t r o c k e r a r m ( f a c i n g g e a r t r a i n housing); t h e e x h a u s t rod, from e x t e r n a l t a p p e t , d r i v e s right r o c l p r . a r m (Fig. 57).

Fig. 1

57

-

I n s t a l l i n g p u s h rods.

,

-

I n s t a l l push r o d t u b e , , a n d p r o p e r l y h o u s e o i l s e a i r i n g s .

Adjust c l e a r a n c e betrveen r o c k e r arms 'and valves turning a d j u s t i n g screw a f t e r loosening loclmut With c o l d e n g i n e , c l e a r a n c e f o r b o t h valves i s 0 . 2 mm.

.

F i g . 58

-

A d j u s t i n g roclcer arms c l e a r a n c e .

21

~~

~~

~~

MANUEL D'ATELIER WORKSHOP

Series LA 400-

MANUAL

I G N I T I ON

1

Standard Type : Insta11 push r o d i n g e a r t r a i n liousing with l o n g e s t guide l o o k i n g o u t s i d e .

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N o u n t c o n t a c t b r e a k e r and condenser.

I n s t a l l c o i l o n crankcase w i t h o u t t i g h t e n i n g clamping screTis.

- I n s e r t a 0.4/0.6

mm. cardboard s h i m ( C i n F i g . 59) between magnet and c o i l ( a i r gap); push c o i l towards flyruheel and t i g i i t e n screws.

F i g . 59

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S e t t i n g a i r gap,

R o t a t e f l y i i h e e l and b r i n g p i s t o n a t TDC, l o o s e n a d j u s t i n g screiv of b r e a k e r c o n t a c t s and s e t gap a t 0 . 7 mm. ( F i g . 6 0 ) .

F i g . 60

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Checking b r e a k e r c o n t a c t gap.

Connect a c i r c u i t iiith a timing l i g h t and s r i i t c h o f f through contacts (Fig. 6 1 ) . I R o t a t e ilyciheel ( c l o c l n i i s e f o r s t a n d a r d e n g i n e s , c o u n t e r c l o d k i i i i s e f o r C . C . W . e n g i n e s ) ti11 t i m i n g l i g h t s&tches o f T a t contt a c t opening. i n t h i s p o s i t i o n check t h a t d i s t a n c e ( t i m i n g advance) bctween: a ) t o p edge of magnet and i n n e r edge o f c o i l c o r e , f o r s t a n d a r d engine ; b ) bottom edge of magnet and i n n e r edge oT c o i l c o r e , f o r count e r c i o c i n i i s e engine i s 5/7 mm. Remount c o i l and b r e a k e r c o v e r s .

T r a n s i s t o r i z e d 'iVpe: i n s t a i i c o i i ( g r e e n ) on crarilccase ma acijust a i r R a p as o u t l i n e d above. Connect c o i l wire i n t r a n s i s t o r cover ana s e c u r e i t t o c r a n k c a s e . F i g . 61

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Checking niagnet t i m i n g advance

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Complete assernbling follorving p a r t s : O i l dipstick; Flywheel guard p l a t e ; Starting pulley; A i r shrouds ; Sparlc p l u g aila connecting c a b l e s ; Rocker a r m cover with b r e a t h e r c a p s ; ' F u e l f e e d i n g pump r i i t h push rod, i f s u p p l i e d ; Muf f l e r ; Tanlc, l i n e s and b r a c k e t ; Connect b u t t e r f l y valve l e v e r and governor through s p r i n g t i e r o d , and secure c a r b u r e t o r r i i t h s u p p o r t elbow; Engine s u p p o r t s ; Air c l e a n e r w i t h s u p p o r t and t u b e ; Clutch b e l l , i f provided.

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MANUEL D'ATELIER

Series LA-400

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WORKSHOP MANUAL

GOVEFWOR LEVER ADJLJSTMENT

Set governor in closed position with throttle lever fully opened (1).

Completely loosen counter lever clamp (3) and shift carburetor control lever and fully open butterfly valve ( 2 ) . Loclc clamp in this position and checli f o r lever snioothness by operating throttle control. Fig. 62

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Adjusting governor control lever

CAPSCREWS TORQUE SPECIFICATIONS

Position

Torque I-.

Thread e; Pitch mm.

Clutch bel1

'I

h

16 x 1.5

Flywhee1 Cylinder head

25

20 x 1.5

6

10 x 1 . 5

Connecting rod Gear train housing

3 3

8 s 1.0

Main bearing loclung pin Shroud Coi1 Carbure tor elbow

3 1-3

8 x 1.25

1.5

6 x 1.0

1.9

8 x 1.25

a

1.25

8 s 1.25

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~ ~ ~ M A N U~D'ATELIER EL~

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WORKSHOP MANUAL A N D

V I - S E T T I N G

T E S T I N G

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i PRE-STARTING CHECRS A f t e r assembling engine, procede with f o l l o w i n g o p e r a t i o n s :

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F i l l o i l s m p and a i r c l e a n e r t o l e v e l . Open f u e l coclc. . When r e p l a c i n g c a r b u r e t o r or rilien o v e r h a u l i n g , malce a f i r s t s e t t i n g by f u l l y c l o s i n g mix-ture a d j u s t i n k s c r e i i and t h e n unscrerii n g i t o f 3 turns.

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C l o s e cholCe'pPa-afe.. Set t h r o t t i e a t 1/3 o f i t s t r a v e i .

IDLE RUIIQJING TEST

Al1 s e t t i n g s sliould b e m a ù e w i t h h o t angine u s i n g a tachometer. Garry out t e s t as follows: ,

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S - t a r t .engine m a g r a d u a i i y open choice-piate. iceep speea a t approximateiy 2000 r . p . m . ? o r 10 minutes. Operate t l m o t t l e malcing s u r e that b u t t e r f l y valve and a l 1 l i n l c age s worlc smoot h l y

I

.

Do i i o t o p e r a t e ' b u t t e r f l y v a l v e or l i n k a g e s d i r e c t l y . B y exc.luc?iiig governol-* a c t i o n , you could cause i n c o n t r o l l e d engine speeds F o r engines w i t h remote t l i r o t t l e c o n t r o l , i t i s riee'essary t o have a f l e x i b l e c a b l e witli l e v e r o r similar . d e y i c e whic3 w i i l a l l o w a c c e l e r a t i n g through g o v e r n o r .

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S e t t i n g i d l e mixture Bring speed t o : 1200/1350 r . p . m .

.. E

Gasoline engines-

Iierosene engines 1300/1350 r e p ; m o , OLI a d j u s t i n g screw A ( F i g . 6 3 ) and at t h e same time reg,u l a t i n g mixture through screw B o n elbow ( F i g . 6 4 ) . .By t u r n i n g screw B i n , f u e l - a i r mixture g e t s l e a n e r ; b y u n s c r e k n g i t , f u e l - a i r mixture . g e t s r i c h e r . by a c t i n g

A f t e r a few a c c e l e r a t i o n s , i d l e speed should remain c o n s t a n t . Should i d l e speed change, a d j u s t agaiii through screws A and B . If engine i s slow i n responding t o t h r o t t l e a c t i o n , s l i g l i t l y unscrew screw B t o o b t a i n a r i c h e r m i x t u r e . F i g . 63

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S e t t i n g i d l e speed.

F i g . 64

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S e t t i n g i d l e mixture.

I d l e and m a x i m u m speed s e t t i n g

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Act on i d l e screw on t h e l e f t o f t h r o t t l e c o n t r o l box unti1 a s l i g l i t speed i n c r e a s e i s o b t a i n e d . Lock screw w i t h loclc n u t . This way, governor r i i l l always s t e p i n under any l o a d c o n d i t i o n . .

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A c c e l e r a t e . t o m a x i m u m a l 1 t h e way t o 3300 r . p . m . Limit l e v e r c o n t r o l t r a v e l througli maximwn,speed screw and loclc i t w i t i i iock nut (Fig. 6 5 ) . F i g . 65

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S e t t i n g i d l e and m a x i m u m speed.

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M A N U E L D'ATELIER

S e r i e s LA 400

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WORKSHOP M A N U A L VI1

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A P P E N D I X

P E E F O R Irf A X C E

L I X I T S

POTER T-UE OFFS Tlre eiigiiie i s p r o v i d e d w i t h t l m e e power talce ofrs :

1 ) Nain p . t . 0 .

011

gear t r a i n s i d e : e n t i r e r a t e d power a l l o w a b l e .

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2 ) Secoildary p . t o .

I

on flpiheel side:

d i r e c t coupling for e n t i r e r a t e d power b e l t c o u p l i n g up t o

h M e t r i c H.P.

For s p e c i a l perfoi-niances c o n t a c t o u r T e c h i c a l Department

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h g u l a r i t i e s are expressed i n degrees: An-lari

ties

Continuous

Longit u d i n a l

Transverse

Discontinuous

35O 40 o

30° 150

MAXI?.iUIrf E.ND THRUST ON CRANIZSHAFT

) &id

load

iii

b o t l i d i r e c t i o n s m u s t n o t e x c e e d 250 I&.

i U X I I m M BEbDING LOAD ON CWIISHAFT

For b e l t d r i v e gear t r a i n s i d e Lever a r m L o a d o n flywheel s i d e Lever a r m Load

011

s1

= =

P2

=

52

=

P1

120

Icg.

62 Iig. 8 0 1%. 68 I@. ( P a g e 25)

OVERALL DIPENSIONS OF ENGINES

INDUSTRIAL TYPE AUTOP.iOTIV-: TYPE I

(Page 26)

2 5 ---20

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MANUEL D'ATELIER .

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WORKSHOP

S e r i e s LA 400

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MANUAL

I N D E X CHAPTER Eiigine Cutaway View SPECl3ICATIONS

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Page

CH4PTER

Page

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15

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17

2

Ignition C i r c u i t

3

E l e c t r i c a l Equipment

.. v 19 ............ 19

...... 11

4

................

4

Introduction

I11

5

O i l Seals

.......' Disassembling . . . . . . . . . . . . . Flyrihe e 1 > l a m et ........... omra uL C ~ C I C Sg: SPECS .. IV C g l i n d e r Head . . . . . . . . . . . . . V a l v e s . Guides and S e a t s . . S p r i n g s and Valves . . . . . . . . T a p p e t s and Roclcer Arms . . . o C y l i n d e r .................. P i s t o n and Rings ...........

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C r a n l c s h a f t & Flywheel

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5

P i s t o n & Cyliiider

19

6

Gear Train Housing

7

Timing

MAINTENANCE SCEEDULE

Capacities

DISASSENBLY INSTRUCTIONS kigine Installation

Piston F i n & C o n n e c t i n g R o d

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7 7 8 6

9 9 10

................ 1O Flywheel .................. 1 1 C a m s h a f t .................. 1 1 F i l t e r s ................... 1 2 Governor .................. 1 2 L u b r i c a t i o u ............... 1 2 C r a n l c s h a f -t

................ F e e d i n g Pump . . . . . . . . .

AND TUNING

. ASSEMBLING

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... .......

19

. . . . . . 20 . . . . . . . . . . . . . . . . . . 20

........... Igni t i oii ................ Governor Lever .4cijust . . . . Torque S p e c i f i c a t i o n s . . . SETTING AND TESTING . . . V I C y i i n ù e r Head

..... T e s t ....... Piixture ....

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P r e - S t a r t i n g . Checks

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I d l e Running

24

Setting Idle I d l e & Piax QPENDM

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Speed S e t t

Ma- Oper

. a.

24

24

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( P e r f o r m Lirnits)VII 55

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25

. Angularities .

25

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25

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25

Power Talce O f f s

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M w

End Thrust On S h a f t Bending Load

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21

Carbure t o r

13

M

fiel

15

Engine O v e r a l l Dimensions 26

27

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