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EFITTING

THE

CRANKSHAFT

- Check the connecting rod axial play.

- While holding the crankshaft manually, check the connec-
ting rod radial play. Measure the play with a comparator pla-
ced on the tip of the connecting rod small end while moving
the connecting rod vertically as shown in the figure.

- Check that the surface of both crankshaft halves is not sco-
red. Using a calliper, measure the width of the crankshaft as
shown in the figure.

HARACTERISTIC

Standard crankshaft width:

Fitting clearance
45

Standard axial clearance:

0,15-0,30

Standard radial clearance:

0,006 - 0,018 mm

Max allowable radial clearance:

0,25

ENGINE

- CRANKCASE - CRANKSHAFT

ENGINE

- CRANKCASE - CRANKSHAFT

EFITTING

THE

CRANKSHAFT

Содержание Dirtboy 10

Страница 1: ...MINIMOTO 50 C C 4T WORKSHOP MANUAL...

Страница 2: ...rand s dealers and sub dealers Due to its constant commitment to improving its products DERBI NACIONAL MOTOR S A U reserves the right to introduce any modifications it deems fit without prior warning...

Страница 3: ...DER PISTON SMALL END INSPECTING THE CYLINDER HEAD DISTRIBUTION CHAIN VALVES INSPECTING THE CAM SHAFT REFITTING THE TIMING CHAIN ASSEMBLING THE TIMING CHAIN TENSIONER REFITTING PICK UP REFITTING CARTER...

Страница 4: ...ons requiring special tools use only those specifically designed for this engine Always replace seals gaskets and split pins with new ones when refitting new or old components After removal clean the...

Страница 5: ...5 x 10 3 00 x 10 2 50 x 12 3 00 x 10 Front suspension 120mm travel hydraulic fork 135mm travel hydraulic fork 160mm mechanical disk 90mm mechanical drum Front brake Rear brake Rear suspension 140mm t...

Страница 6: ...41 8 mm 49 93 mm 11 5 12 5 1 PHVA Champion RG 4 HC overhead single camshaft two valves chain controlled on l h side 0 10 mm en cold 0 10 mm en cold Engine lubrication by chain driven lobe pump in cran...

Страница 7: ...e fixing screws Head cover screw Oil pump crankcase fixing screws Intake manifold fixing screws Carburettor manifold clamp screw Starter motor fixing screw Flywheel cover fixing screw Transmission cov...

Страница 8: ...Every 3 month Every 3 month Every 6 month Every 6 month Every engine oil replacement At 5 hours or 1 month At 5 hours or 1 month At 5 hours or 1 month At 5 hours or 1 month At 5 hours or 1 month At 5...

Страница 9: ...HARACTERISTICS Recommended spark plug Champion RG 4 HC MAINTENANCE M M MAINTENANCE MAINTENANCE CHART ACTION FREQUENCY Engine oil Replacement Idle speed Fuel Change Filtro aceite Sustituci n Valve clea...

Страница 10: ...fter draining the oil clean the gauze strainer with a suitable solvent and then blow it with compressed air To gain access to the gauze strainer remove plug A see figure Refit the strainer and tighten...

Страница 11: ...ucts AGIP CITY 4 T Synthetic oil 20W40 The oil level must be at the lower edge of the filler cap Therefore before starting the cold engine it is necessary to check the oil level using the inspection h...

Страница 12: ...reference marks as for the valve timing point described earlier Using a thickness gauge ensure the clearance between the valve and the valve adjuster is within the indicated values If the valve cleara...

Страница 13: ...e the manometer and refit the components following the removal procedure in the reverse order If the pressure is below the min allowable pressure check the engine speed in test conditions If this is t...

Страница 14: ...g in the crankcase and the return spring Replace any damaged part Refit the toothed segment as show in the figure pre loading the spring by hand REMOVING THE ENGINE PINION Using the special tool retai...

Страница 15: ...ION DO NOT USE TOOLS TO OPEN THE MASSES SO TO AVOID LOAD VARIATIONS IN THE SPRINGS INSPECTING THE CLUTCH DRUM Check that the clutch bell housing is not worn or damaged Measure the inside diameter of t...

Страница 16: ...gio 40 44 Nm END GEAR SHAFT Insert the chain gear shaft and secure with its circlip as shown in the figure REFITTING THE TRANSMISSION COVER Refit the gasket new Refit the cover tightening the seven sc...

Страница 17: ...G Restrain the rotation of the flywheel using the special tool Remove the M10X1 25 flanged nut Extract the flywheel with the specially designed extractor Specific tooling 020565Y Compass flywheel stop...

Страница 18: ...N THE OIL BREATER TUBE REMOVING THE TIMING SYSTEM DRIVE Remove the chain tensioner central screw together with its spring washer and O ring Loosen the chain tensioner central screw and remove it with...

Страница 19: ...KE Specific tooling 020565Y Compass flywheel stop spanner REMOVING THE CAM SHAFT Remove the bearing check screw shown in the figure Remove the camshaft complete with the bearing using the specific too...

Страница 20: ...in the figure Loosen the four cylinder head locknuts in two or three phases following a crosswise pattern Remove the cylinder head the two dowel bolts and the gasket N B SHOULD IT BE NECESSARY THE HE...

Страница 21: ...Remove the cylinder minding the aligning pin on the crank case Remove the cylinder base gasket CAUTION TO AVOID DAMAGING THE PISTON SUPPORT IT WHILE REMOVING THE CYLINDER Remove the two circlips the...

Страница 22: ...ax allowable diameter 13 030mm INSPECTING THE WRIST PIN Measure the piston pin outside diameter CHARACTERISTIC Standard diameter 13 0 0 004 mm Minimum allowable diameter 12 990 mm Calculate the mating...

Страница 23: ...ndard cylinder diameter 39 024 38 996 Maximum allowable runout 0 05 mm Pistons and cylinders are classified according to diameter Mating is obtained by matching class letters A A B B C C D D INSPECTIN...

Страница 24: ...height 57 15 0 15 Cylinder base gasket thickness 0 5 Measured value 0 40 0 25 Gasket thickness 0 25 0 05 Measured value 0 25 0 05 Gasket thickness 0 35 0 05 Carefully clean the piston ring grooves us...

Страница 25: ...cylinder axis Using a thickness gauge see figure measure the gaps of the piston rings If any measurements are greater than prescribed replace the piston rings ENGINE E E CYLINDER ASSY AND TIMING SYST...

Страница 26: ...EW PISTON RINGS USED IN COMBINATION WITH A USED CYL INDER MAY HAVE DIFFERENT BEDDING CONDITIONS THAN THE STANDARD STANDARD GAP MAXIMUM GAP ENGINE E E CYLINDER ASSY AND TIMING SYSTEM ENGINE CYLINDER AS...

Страница 27: ...the circlip into the tool by means of the drift Rest the tool on the piston taking care that the side with the 90 bevel always faces upwards as shown in the figure Fit the piston pin circlip using th...

Страница 28: ...HE CYLINDER FOR THIS REASON IT IS IMPORTANT THAT THE RINGS SHOULD BE FITTED WITH THE T FACING UPWARDS STAGGER THE PISTON RING GAPS BY 120 DE GREES AS SHOWN IN THE FIGURE LUBRICATE THE PARTS WITH ENGIN...

Страница 29: ...AREFULLY BLOW THE LUBRICATION DUCT AND OIL THE CYLINDER BARREL Specific tooling 020288Y Fork for fitting piston to cylinder Locking torques N m Timing chain tensioner screw 8 10 Nm INSPECTING THE CYLI...

Страница 30: ...e assembly Removing the central screw with the O ring and the chain tensioner spring Ensure the unidirectional mechanism is not worn Check the condition of the tensioner spring If any worn components...

Страница 31: ...direction EXHAUST GUIDE INTAKE GUIDE If the width of the impression on the valve seat or the dia meter of the valve guide exceed the prescribed limits repla ce the cylinder head Measure the width of...

Страница 32: ...t or if any bending or gaps are noted replace the valve If no anomalies are found during the above checks the same valves can be reused For best sealing results it is advisable to grind the valves Gri...

Страница 33: ...caps and the cotter halves show no signs of abnormal wear REFITTING THE VALVES Lubricate the valve guides with graphitized oil Position the valve spring lower caps on the cylinder head Using the spec...

Страница 34: ...12 0 002 0 010 mm Standard diameter Bearing B 16 0 015 0 023mm Minimum allowable diameter Bearing A 11 98mm Minimum allowable diameter Bearing B 15 96 mm Standard height Intake 25 935 mm Standard hei...

Страница 35: ...gasket with the same thickness as the old one Insert the cylinder holding down studs into the cylinder head and tighten the four locknuts with a torque indicate N B REPLACE THE CAMSHAFT BEARING WITH A...

Страница 36: ...90 FoIlo wing the order indicated REFITTING THE TIMING CHAIN N B SEE REFITTING THE TIMING CHAIN TO BE CARRIED OUT BEFORE RECOUPLING THE HALFCRANKCASES Insert the spacer on the camshaft Using the mark...

Страница 37: ...screws shown in the figure Specific tooling 020565Y Compass flywheel stop spanner Locking torques N m Camshaft pulley screw 12 14 Nm Head cover screw 8 10 Nm Set the tensioner slider in its home posit...

Страница 38: ...screws M4x16 2 3 Nm Pick up flywheel side halfcrankcase fixing screws M6x16 8 10 Nm Mounting bracket for stator assy flywheel side half crankcase fixing screws M6x20 8 10 Nm Flywhe el fixing flanged n...

Страница 39: ...graphs Remove the ten half crankcase coupling screws Split the crankcase halves with the crankshaft remaining installed in the flywheel side half Remove the crankshaft by heating the halfcrankcase up...

Страница 40: ...the three points shown in the figure Check the condition of the crankshaft cone the tab seat the oil seal bearing the knurled pin and the threaded tangs If any anomalies are found replace the cranksh...

Страница 41: ...ing rod vertically as shown in the figure Check that the surface of both crankshaft halves is not sco red Using a calliper measure the width of the crankshaft as shown in the figure CHARACTERISTIC Sta...

Страница 42: ...he chain gear shaft Refit the oil pump on the crankcase and secure it by tightening the two screws with the prescribed torque Install the two locating pins preferably on the transmission side crankcas...

Страница 43: ...icate in figura Montare la guarnizione utilizzando come riferimento i due grani Accostare i due carter e montare Ie 10 viti e bloccare alia coppia prescritta Locking torques N m Half crankcase joining...

Страница 44: ...c tooling 020340Y Flywheel side oil seal fitting drift Oil pump OIL PUMP INSPECTION Remove the two oil pump fixing screws Remove the inner rotor circlip Remove the rotors and carefully clean them with...

Страница 45: ...BODY PLANE CHARACTERISTIC Maximum allowable clearance 0 09 mm Check that the pump cover is not worn or scored If any measurement is not as specified or if any part is scored replace the part or the a...

Страница 46: ...hrottle valve cover paying attention to the attached components throttle valve conical needle and return spring CAUTION DO NOT ATTEMPT REMOVING COMPONENTS ATTACHED TO THE CARBURETTOR BODY SUCH AS FUEL...

Страница 47: ...the float and its conical needle Refit the float bowl ensuring the seal is properly positioned in its housing WARNING TO AVOID DAMAGE DO NOT INSERT METAL OBJECTS IN THE CALIBRATED SECTIONS ENGINE E E...

Страница 48: ...create by w w w ciandisseny com...

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