MORINI FRANCO MOTORI S.p.A.morinifrancousa.com/SLC-motor-servicemanual.pdf · Page 6 S6 /C ENGINE...

SERVICE MANUAL

S6-C COMPETITION

50cc – 2 stroke - liquid cooled

S6 /CENGINE

INDEX

TECHNICAL SPECIFICATIONS 2

SPECIAL TOOLS 3 - 4

PERIODIC MAINTENANCE 5

LUBRICANTS 6

TROUBLESHOOTING 7 - 14

TIGHTENING TORQUE TABLE 15

ENGINE DISASSEMBLY 16 - 24

ENGINE REASSEMBLY 25 - 37

SPECIAL 3-SHOE CLUTCH DISASSEMBLY/REASSEMBLY 38 - 39

SPECIAL 3-SHOE CLUTCH ADJUSTMENT PROCEDURE 40

ENGINE COMPONENT INSPECTION AND SERVICE 41 - 43

GENERAL PARTS LIST + EXPLODED VIEW TABLES xx

S6 /CENGINE

SPECIFICATIONSCYCLE ......................................................... - 2 strokeNr. of CYLINDERS....................................... - 1DISPLACEMENT.......................................... - 49.908 cc.BORE AND STROKE mm............. - 39 X 41.8CYLINDER MATERIAL ................................. - Aluminium with Ni / Si carbide coatingCOMPRESSION RATIO................................ - (15.5 ±0.3) : 1SPARK PLUG .............................................. - CHAMPION C53TIMING SYSTEM .......................................... - Reed valve with 4 carbon fibre flapsMAX. R.P.M. .................................................. - 14500 (rpm) MAXCARBURETOR ............................................ - 12/14/19 mm diameterINTAKE MANIFOLD ..................................... - AdjustableFUEL ............................................................ - EURO UNLEADED NC 623/02 - R.O.N. 95

LUBRICATION OIL MIXER TYPE ................. - 2% AGIP 2T CITYLUBRICATION WITH OIL PUMP .................. - On requestIGNITION ...................................................... - Electronic with microchipPRIMARY DRIVE GEAR ............................... - Straight-tooth gears Z 14/59..................................................................... with safety coupling..................................................................... Ratio 1:4,21

SECONDARY DRIVE GEAR......................... - Sprocket Z 10 or Z11

..................................................................... Chain type 1/2 x 3/16 roller 7.75

CLUTCH ...................................................... - Automatic centrifugal clutch in oil bath..................................................................... Adjustable

TRANSMISSION GEAR OIL ......................... - SAE 20 W quantity 250 ccSTARTER...................................................... - Kick starterCOOLING ...................................................... - With liquid pump

TECNICAL SPECIFICATIONS

S6 /CENGINE

143154

143176

143156

143179

143180

143181

CodeFigure Description

SPECIAL TOOLS

BEARING INSTALLERoutput shaft

BEARING INSTALLERcrankshaft

BEARING INSTALLERoutput shaft

OIL SEAL INSTALLERoutput shaft

OIL SEAL INSTALLERcrankshaft (flywheel + clutch)

OIL SEAL MOUNTING PROTECTIONcrankshaft (flywheel + clutch)

S6 /CENGINE

140558

143162

143155

SPECIAL TOOLS

CodeFigure Description

OIL PUMP SHAFT INSTALLER(pre-assembled)

FLYWHEEL REMOVER

CRANKCASE PULLER

143294SPECIAL CLUTCH ADJUSTMENT TOOL

S6 /CENGINE

PERIODIC MAINTENANCE

RUNNING-IN RECOMMENDATIONS:

During the running-in period, i.e. for approx. the first 500 km on the road, please note as follows:- Do never run the engine at maximum revolutions.- Do never keep the vehicle at maximum speed.- Do not keep the engine at idle speed for longer time.

FIRST MAINTENANCE SERVICE:

to be carried out after 500 - 600 km.

- Replace the engine oil- Check the carburation and adjust if necessary- Check the tightness of nuts and bolts.(See table “tightening torques” pag. 15)

S6 /CENGINE

LUBRICANTS

N.B.Use original MORINI FRANCO MOTORI spare parts only

N.B. TRANSMISSION OIL LEVEL CHECKRemove the oil filler cap on the clutch cover and check the transmission oil levelthrough window.

RECOMMENDED LUBRICANTS / ADHESIVES

DESCRIPTION CHARACTERISTICS

Transmission oil AGIP RADULA 68 SAE 20W

Assembly of various parts GR/SM2 GREASE

Special assembly GRAPHITISED MOLYCOTE type GREASE

Thread-locking glue LOXEAL 82-21

Clamping glue LOXEAL 83-54

S6 /CENGINE

TROUBLESHOOTING

Possible CAUSE of the fault

The following flow charts give a general outline of the causes and effects when the engine is notrunning correctly.Descriptions of solutions for a specific cause are general; for more details the reader shouldconsult the disassembly-reassembly manual.

LEGEND OF SYMBOLS

EFFECT (fault noticed by the user)

Possible general SOLUTION to the fault

S6 /CENGINE

YES

NO

NO

Starting problems

Faulty spark plugor wrong spark plug

heat rating

YES Check spark plug andreplace if necessary.

Engine floodedYES

Start the engine with thethrottle fully open.

Remove the spark plug,rev the engine, install adry spark plug and restartthe engine.

The enginestarts

Sparking starts athigh r.p.m.

Replace the ignition coil

NO

S6 /CENGINE

YES

YES

YES

NO

NO

YES

NO

Maximum indicated runningspeed cannot be reached

Soiled orclogged

filter

Disassemble, wash sponge with a50% solution of petrol and 2T oil;leave to dry. Clean the filter boxusing compressed air; re-assemble.

Silencerobstructed

Check the silencer for clogging.Replace if necessary.

Cylinderexhaust portsoiled with

carbondeposits

Disassemble the cylinder and checkthat the exhaust pipe is clean. If theexhaust pipe is partly obstructed bycarbon deposits, clean it thoroughlyusing a scraper.

Poorcompression

Disassemble the cylinder head,cylinder and piston.Remove the piston rings, placethem in the cylinder liner and checkthe amount of wear.Replace if excessively worn.

S6 /CENGINE

YES

YES

NO

Poor acceleration / pickup

Clutch

Irregularacceleration

Check the cluth shoe thickness andthe clutch springs for stretching.If excessively worn they should bereplaced.

Check the exact number of turnsof the air adjusting screw on thecarburetor.

S6 /CENGINE

YES

YES

YES

YES

NO

NO

YES

YES

Incorrect idling speed

Idling speedtoo high or

too low

Adjust the RPM of the idling speed(with engine warm) by adjusting thescrew on the throttle valve of thecarburetor.

Disassemble the carburetor andclean all parts (nozzles, throttle val-ve, jet needle, float chamber andbody) with solvent and dry by usingcompressed air.

False airintake fromcarburetormanifold

Check the integrity of thecarburetor manifold gaskets.

Check the integrity of the rubbercoupling sleeve that connects thecarburetor and air filter box .

Check the reed valve gasket.

False airintake

from enginecrankshaftoil seals

Check the integrity of thecrankshaft oil seals. Replaceeven if only slightly damaged.

S6 /CENGINE

YES

YES

NO

NO

YES

Noisy engine

Incorrecttransmission

gearsassembly

Loosetransmission

nut

Transmissionnoise and rearwheel drag atidling speed.

Check the assembly of all gears andparts of the transmission.

Check the tightening torque of theclutch nut.

Check the clutch unit

S6 /CENGINE

YES

YES

YES

YES

NO

NO

Noisy engine

Noisy gears

Check the oil level.Refill if necessary.

Check the teeth of the drive gearsvisually.Replace if signs of damage orwear are evident.

Noisycylinder

unit

Check the clearance between thepiston and the cylinder. If it doesnot correspond to the prescribedvalue, replace the cylinder andpiston.

Noisycrankshaftbearings

BEARING INSPECTIONRotate the bearing inner race by fin-ger to inspect for abnormal play, noiseand smooth rotation while thebearings are mounted in thecrankcase.Replace the bearing if anythingunusual is found.

S6 /CENGINE

YES

YES

YES

NO

NO

YES

NO

Smokey exhaust

Percentage ofmixer oil

Replace the fuel in the tank withnew fuel mixed with 2% of the typeof oil indicated in the handbook.

Mixer oilCheck that the oil is 100%synthetic for separate oil mixerpump use.

Carbondeposits

Disassemble the cylinder andremove any carbon deposits;check the silencer for clogging.

Oil mixerpump

Disassemble the oil mixer pumpand check the flow rate.

S6 /CENGINE

TIGHTENING TORQUES

DENOMINATION TORQUE(Nm)

Cranckcase bolts 10 - 12

Clutch cover bolts 10 - 12

Flywheel cover bolts 3 - 4

Carburetor manifold bolts 9 -10

Stator clamping bolts 3 - 4

Oil pump clamping bolts 5 - 6

Carburetor clamping screw 3 - 4

Kick starter lever bolt 8 - 10

Oil drain plug 8 - 10

Clutch nut 50 - 55+ Loxeal 83-54

Flywheel nut 8 -10+ Loxeal 83-54

Head nuts 12 - 14

Head clamping bolts 10 - 12

Pulley clamping bolts 3 - 4+ Loxeal 83-54

Water pump rotor5 - 6

+ Loxeal 83-54

Spark plug 20 - 25

S6 / C

Page 16

ENGINE

ENGINE DISASSEMBLY

CARBURETOR UNIT

TOOLCODEDIAGRAM DESCRIPTION NOTES

Disassemble the CARBURETOR

Loosen the SCREWS and remove theCARBURETOR MANIFOLD

Remove the CARBURETORMANIFOLD BASE including theREED VALVE

BEFORE LOOSENTHE SCREWSCHECK ACTUALMANIFOLD ANGLEPOSITION

THE MANIFOLD ISCOMPOSED BY 4ELEMENTS.

S6 / C

Page 17

ENGINE

CYLINDER HEAD - CYLINDER - PISTON

Remove the SPARK PLUG

Remove the 4 CYLINDER HEADBOLTS

Remove the 4 CYLINDER HEADNUTS

Remove the CYLINDER HEAD PAY ATTENTION TOTHE DOWEL PINS


Check the condition of the O-RING(HEAD GASKET).Replace if excessively worn.

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Page 18

ENGINE

Disassemble the CYLINDER andremove the CYLINDER BASEGASKET


S6 / C

Page 19

ENGINE

FLYWHEEL SIDE

Loosen the clamping BOLTS andremove the FLYWHEEL COVER

MIND THE BRACKETINSIDE THE COVER

Disassemble the FLYWHEELSTATOR

Disassemble the FLYWHEELROTOR

ROTOR LOCK NUTCLAMPED WITHLOXEAL

143151

Remove the PULLEY CLAMPINGBOLT

Remove the DRIVEN PULLEY


S6 / C

Page 20

ENGINE

The following operations can only be carried out after opening the crankcase

Unscrew the WATER PUMP ROTORBLOCK THE PUMPSHAFT

Remove the PUMP SHAFT UNITincluding the bearings.The pump shaft seal ring must bereplaced by every disassembly.The 2 bearing snap rings on thewater pump must be replaced byevery disassembly.

PAY ATTENTIONTO THE SPACERSBETWEEN THEBEARINGS

Remove the PUMP DRIVE BELT

Remove the SPECIAL SNAP RING

Remove the SPACER RING



S6 / C

Page 21

ENGINE

CLUTCH SIDE

ONLY IF CLUTCHNEEDS TO BEADJUSTED

Compass tool CLAMPED WITHLOXEAL.

MAKE SURE TODRAIN THEENGINECOMPLETELY

Disassemble the CLUTCHADJUSTING PLUG

Remove the OIL DRAIN PLUG(cross head)

Loosen the clamping BOLTS on thecover and remove the CLUTCHCOVER

Remove the SPECIAL FRONTCLUTCH NUT and theBELLEVILLE WASHER


S6 / C

Page 22

ENGINE

Disassemble the SPECIAL CLUTCHand the 2.5mm SPACER RING

Remove the CLUTCH BELL and the0.8mm SPACER RING


S6 / C

Page 23

ENGINE

143162

CRANKCASE “OPENING”

Remove the cylinder STUD BOLTS ifnecessary BLOCKED WITH

LOXEAL

Remove the 8 CRANKCASE BOLTS

Open the CRANKCASE

THE CRANKSHAFTIS DRIVEN ONTOTHE BEARINGS.OPEN THECRANKCASE FROMFLYWHEEL SIDEUSING THEPULLER TOOL

Remove the DOWEL PINS and theCRANKCASE GASKET.Remove the crankshaft if necessary


S6 / C

Page 24

ENGINE

Remove the OUTPUT SHAFT SNAPRING

Remove the OUTPUT SHAFT

Inspect the OUTPUT SHAFTBEARING for abnormal play and noise.Replace the bearing if anythingunusual occurs.

Remove the SNAP RING

Remove the BEARING by using astandard bearing remover set.

To replace the CRANKSHAFTBEARING and the OUTPUT SHAFTROLLER CAGE (flywheel side) followthe same procedure as describedabove.

THE BEARING ISDRIVEN INTO THEBEARING HOUSING


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Page 25

ENGINE

ENGINE REASSEMBLY

WATER PUMP PREASSEMBLY

Preassemble the WATER PUMPSHAFT UNIT by mounting thecomponents in the following order:snap ring + bearing + spacer + bearingand secure with the snap ring.

Insert the complete unit in the HALFCRANKCASE FLYWHEEL SIDE

Insert the SPACER RING

Insert the SPECIAL SNAP RING

Insert the SEAL RING

Reassemble theWATER PUMP ROTOR

THE SEAL RINGMUST ALWAYS BEREPLACED WITH A

NEW ONE

Tightening torque5 - 6 Nm +

Loxeal 83 - 54


143155

S6 / C

Page 26

ENGINE

CRANKCASE PREASSEMBLY

143176

143154

143156


Drive the OUTPUT SHAFT BEARINGinto the half crankcase clutch side andsecure with the snap ring

LUBRICATE THEHOUSING

LEAVE THE PRINTON THE BEARING

VISIBLE

Drive the CRANKSHAFT BEARINGSinto the half crankcase clutch side andinto the half crankcase flywheel side.



VISIBLE

Drive the ROLLER CAGE OUTPUTSHAFT into the half crankcaseflywheel side.



VISIBLE

S6 / C

Page 27

ENGINE

CRANKCASE “CLOSING”

Insert the DRIVE SHAFT in the halfcrankcase clucth side

Insert the SNAP RING onto thesecond output shaft slot (neartransmission gear)

Insert the OUTPUT SHAFT into the halfcrankcase clutch side and secure withSNAP RING

Insert the DOWEL PINS



S6 / C

Page 28

ENGINE

Fix 1 x BOLT M6X60 in the postionbetween the stud bolts and the reedvalve zone.

143179143180143181

Lubricate the CRANKCASE GASKETon both sides.

Apply the CRANKCASE GASKET onthe half crankcase clutch side usingthe 2 dowel pins for centering.

Assembly the HALF CRANKCASES

Grease the oil seal housing and theoil seal lip carefully.

Install the CRANKSHAFT OIL SEALRINGS and the OUTPUT SHAFT OILSEAL RING.

Trim the crankcase gasket (cylinderzone and carburetor zone.)

Fix the remaining 7 X BOLTS M6X50.Cross-tighten the bolts using atightening torque of 10-12 Nm.Check to make sure that thecrankshaft and output shaft rotatesmootly.

DO NOT TIGHTEN


GREASE TYPEGR/SM2

S6 / C

Page 29

ENGINE

FLYWHEEL SIDE


Loxeal 83 - 54

143151

Mount the DRIVEN PULLEY on thewater pump shaft and position thePUMP DRIVE BELT on the splinedsection of the crankshaft.

Secure the pulley with bolt M4x14

Mount the SPROCKET and securewith the SNAP RING

Place the UNDER ROTOR SPACERon the crankshaft.

Caulk the key seat on the crankshaftand insert the FLYWHEEL KEY.

Mount the FLYWHEEL ROTOR with theblack side facing the crankcase.



Loxeal 83- 54

S6 / C

Page 30

ENGINE

Drive in the 2 elastic dowel pins in thecover. and make sure that they doNOT INTERFERE with the bracketmounting face.

Assemble the BRACKET on theflywheel cover.

Assemble the FLYWHEEL COVERplacing the rubber fairleads in theirproper seats on the cover.

Secure the FLYWHEEL COVER using:

3 SCREWS M5X50 + WASHER.1 SCREW M5X20 + WASHER.

Tightening torque3-4 N.m.

Install the FLYWHEEL STATOR withthe output cable facing the crankcase.


Secure the flywheel stator with2 BOLTS M4 x 18

Tightening torque3 - 4 Nm

S6 / C

Page 31

ENGINE

CYLINDER - PISTON - HEAD UNIT

Assemble the ROLLER CAGE,PISTON and PISTON PIN andsecure with CIRCLIPS.

OIL THE PISTON

Insert the CYLINDER BASE GASKETand mount the CYLINDER

Insert the CYLINDER HEAD DOWELPINS

Apply the O-RING SEAL on theCYLINDER HEAD

Install the CYLINDER HEAD on theCYLINDER using the dowel pins ascentering reference


WHENINSTALLING THEPISTON TURNTHE ARROWMARK ON THEHEAD OF THEPISTON TO THEEXHAUST SIDE

S6 / C

Page 32

ENGINE

Install the SPARK PLUG and tighten Tightening torque20 - 25 Nm.

Fit the 4 CYLINDER HEAD NUTS onthe stud bolts and tighten

(Cross tighten)Tightening torque

12 - 14 Nm.

Fit the 4 CYLINDER HEAD BOLTS andtighten

(Cross tighten)Tightening torque

10 - 12 Nm.


S6 / C

Page 33

ENGINE

CARBURETOR UNIT

Insert the CARBURETOR MANIFOLDBASE including the REED VALVE.

Assemble the CARBURETORMANIFOLD on the base and securewith 4 BOLTS M6X25.


Check the angleposition of theMANIFOLD beforetightening thebolts.

Tightening torque9 - 10 Nm.

Assemble the CARBURETOR andtighten the CLAMP SCREW.

Tightening torque3 - 4 Nm.

S6 / C

Page 34

ENGINE

CLUTCH COVER

Assemble the SPRING on the slidinggear as shown on the figure.

Lubricate the inside of the spring usingGR MU/3 grease.

Assemble the SLIDING GEAR onthe cover and secure the SPRINGbetween the two stops.

Assemble the SPACER RING andO-RING on the KICK STARTERSHAFT.

Lubricate the O-ring area usingGR MU/3 grease.

Lubricate the KICK STARTERSHAFT in the clutch cover operatingzone using grease type MOLYCOTE.Install KICK STARTER SHAFT in theclutch cover and make sure that thegear section is engaged properly withthe sliding gear.After assembly check that the springof the sliding gear is correctlypositioned between the two stops.

Drive the WATER CIRCUIT DELIVERYPIPE into place


143167

S6 / C

Page 35

ENGINE

Install and load the RETURN SPRINGon the kick starter shaft.

Secure the spring on the backstop inthe clutch cover.

Assemble the SPRING WASHER andsecure with the SNAP RING.

Place the SPACER on the kick startershaft and secure with the snap ring.

Assemble the KICK STARTER LEVERand fasten by using the bolt M7x25.

KICK STARTER LEVER POSITION*Steel lever = 109°*Aluminium lever = 96°

Check axial clearance: 0.1 - 0.3 mm



KICK STARTER LEVER POSITION

*Aluminium lever = 96°*Steel lever = 109°

S6 / C

Page 36

ENGINE

CLUTCH SIDE

Insert the 0.8mm SPACER RING onthe crankshaft clutch side.

Lubricate the clutch bell operating zoneof the crankshaft using the grease typeROCOL ASP MOLYCOTE.

Install the CLUTCH BELL

Insert the 2.5 mm SPACER RING

Install the CLUTCH ON THECRANKSHAFT, INSERT THEBELLEVILLE WASHER and clampthe clutch using the SPECIALFRONT-CLUTCH NUT.(LEFT HAND THREAD)

Add LOXEAL 83-54 to the clutch nutand tighten

Tightening torque 50-55 N.m.

Check the axial clearance of theclutch bell: 0.3 - 0.5 mm

Assemble the clutch cover gasket.

Compass tool

CAUTION

In order to avoidany clutch hubjamming on thespline shaft and toensure any futuredisassemblyoperation of theclutch unit, makesure to applyLOXEAL 83-54exclusively on thecluth nut and NOTon shaft end.


S6 / C

Page 37

ENGINE


Tightening torque 8-10 N.m.

RecommendedOil type:

AGIP RADULA 68SAE 20W

Mount the clutch cover and securewith 6 BOLTS M6 x 30.

Insert the OIL DRAIN PLUG +WASHER and tighten.

Pour 250 cc of oil type AGIPRADULA 68 SAE 20W and fit theOIL FILLER CAP + GASKET.

AFTER COMPLETED ASSEMBLYCHECK THAT THE ENGINEROTATES SMOOTHLY


S6 / C

Page 38

ENGINE

143155

143342

S6 OIL MIXER PUMP

Preassemble the 2 BEARINGS andSPACER on the OIL MIXER PUMPDRIVE SHAFT and secure with 2SNAP RINGS.

The print on the bearings should facethe drive end of the shaft.

Lubricate the bearing housing.Drive the OIL MIXER PUMP DRIVESHAFT UNIT into the half crankcaseflywheel side.

Insert the CLEARANCE SPACER.Assemble the BEARING SNAPRING.

Insert the DRIVE BELT onto theDRIVEN PULLEY.

Install the pulley on the oil mixer pumpshaft and the drive belt onto the splinedpart of the crankshaft.

Assemble the oil mixer pump on thesupport bracket and tighten thescrew M5x12.

In order to simplify the assemblyoperation of the oil mixer pump,make sure that the timing of thedriven pulley and the oil mixerpump shaft do match.

Install the BRACKET with OILMIXER PUMP into the housing of thehalf crankcase flywheel side.


Tightening torque5 - 6 Nm

S6 / C

Page 39

ENGINE

SPECIAL 3-SHOE CLUTCH

DISASSEMBLY

Remove the 3 special clutch adjusting screws.

ATTENTIONEach screw contains 1 spring an 2 balls.

Remove the 21 Belleville washers.

Take note of the assembly configuration.

Remove the screw couplings.

Unscrew the clutch shoe retainer pawls andremove the flat spring.

Disassemble the clutch shoes, the bushingsand the 3 clutch shoe socket screws M4x14.

S6 / C

Page 40

ENGINE

SPECIAL 3-SHOE CLUTCH REASSEMBLY

Grassare = Lubricate

Apply a thin film of molycote grease on the shoe-holder plate.Insert the clutch shoe socket screws.

Lubricate the outer diameter working zone of the 3 bushings withmolycote grease.Insert the bushings in the clutch shoe fulcrums.

Position and install the clutch shoes on the shoe-holder plate usingthe bushings as centering references.Apply a thin film of molycote grease on the working area of the flatspring.

Assemble the flat spring on the clutch with the 3 clutch shoeretainer pawls and tighten.

Tightening torque 5.8 - 6.8 Nm

Lubricate the square holes in the flat spring and insert the 3 screwcoupling.

Grassare = Lubricate

Insert 7 Belleville washers in each hole maintaining the correct assembly configuration.

See figure.

S

Sede molle = Spring seat.

Place 2 balls and 1 spring in each of the 3 special clutch adjusting screws.

Install the 3 adjusting screws making sure that the balls and the the springs remain positioned correctly in the screw housings.

S6 / C

Page 41

ENGINE

SPECIAL 3-SHOE CLUTCH ADJUSTMENT PROCEDURE

Place the clutch on the special tool code 143294 and block it using the screw knob “C”.Position the clutch with one of the shoes blocked against the tool clutch shoe stop.Mount the main tool screw knob “C” and apply a constant torque of 8,5 Nm by using adynamometric spanner tool with direct torque reading.

When keeping the torque constant, check the clearance “X” between the shoe and the checkpin “A” using a thickness gauge.

CAUTIONThe thickness gauge must make minimal friction against the parts: it should not pass freelyand should not stick between the clutch shoe and the check pin.

Make sure that the thickness gauge do pass along the entire thickness “Y” of the shoes.

ADJUSTMENT PROCEDURE (1 clutch shoe at a time)1/Unload the dynamometric spanner tool.2/To increase the clearance “X” turn the screw “B” clockwise.3/To decrease the clearance “X” turn the screw “B” aniti clockwise.4/Repeat the procedure for each clutch shoe.

Clutch shoe stop

Check pin “A”

Clearance “X” = 0.25 mm

Screw knob “C”

S6/CENGINE

ENGINE COMPONENT INSPECTION AND SERVICE

CYLINDER - PISTON TABLE

PartValue (mm)

50cc

CylinderPistonPiston rings :1)Piston ring 1st slot2)Piston ring 2nd slot

Ø 39Ø 39

Ø 39 x 2 - 0.01 - 0.025Ø 39 x 1.25 - 0.01 - 0.025

S6/CENGINE

+ 0,010

+0,005

+ 0,015

+ 0,010

+ 0,020

+ 0,015

+ 0,025

+ 0,020

+ 0,030

+ 0,025

+ 0,035

+ 0,030

- 0,025

- 0,020

- 0,025

- 0,015

- 0,020

- 0,010

- 0,015

- 0,030

- 0,005

- 0,010

- 0

- 0,005

CYLINDER - PISTONASSEMBLY SELECTION TABLE

CHECK POSITIONFor correct dimension control

SIZE CODE(stamped on part)

CYLINDER - PISTONDIMENSIONS mm ASSEMBLY

CLEARANCECYLINDER PISTON

A ø 39 ø 39

B ø 39 ø 39

C ø 39 ø 39 0.030 - 0.040mm

D ø 39 ø 39

E ø 39 ø 39

F ø 39 ø 39

S6/CENGINE

+0,18

CYLINDER CHECK-Check the internal surface of the cylinder for signs of seizure or abnormal wear.-Measure the internal diameter of the cylinder using a bore gauge.-Wear limit: Minimum indicated cylinder selection diameter + 0.03mm.-Take measurements in three different positions along the axis of the cylinder.-In each position take two measurements, one parallel with and the other perpendicular to the crankshaft axis.

PISTON CHECK

-Remove the piston rings and check the piston for abnormal signs and wear.

N.B.The piston rings are fragile, handle with care.

RING-TO-GROOVE MEASUREMENT.Wear limit: 0,08 mm max.

PISTON BORE MEASUREMENT.-Maximum permitted diameter:12 + 0,18 mm

-Measure the piston outside diameter in the direction perpendicular to the piston axis at 14,5 mm from the skirt.

MORINI FRANCO MOTORI S.p.A.morinifrancousa.com/SLC-motor-servicemanual.pdf · Page 6 S6 /C ENGINE...

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Transcript of MORINI FRANCO MOTORI S.p.A.morinifrancousa.com/SLC-motor-servicemanual.pdf · Page 6 S6 /C ENGINE...