Specifications

Piston rings
On each piston there are:
•
1 top piston ring;
•
1 middle piston ring;
•
1 oil scraper piston ring.
Turn the rings so that the coupling ends are 120 degrees from each other.
CLEARANCE BETWEEN PISTON RINGS AND SEATS ON PISTON
Specification Desc./Quantity
Top ring 0.030 - 0.065 mm (0.00118 - 0.00256 in)
Middle ring 0.020 - 0.055 mm (0.00079 - 0.00216 in)
Oil scraper ring 0.010 - 0.045 mm (0.00039 - 0.00177 in)
Gap between the end of the piston rings inserted in the cylinder:
•
Top and middle piston ring: 0.40 - 0.65 mm (0.00158 - 0.00255 in)
•
Oil scraper piston ring: 0.30 - 0.60 mm (0.00118 - 0.00236 in).
Crankcase - crankshaft - connecting rod
CRANKSHAFT SEAT (TIMING SYSTEM SIDE)
Specification
Desc./Quantity
Diameter of crankshaft main journal, timing system side 37.975 - 37.959 mm (1.49507 - 1.49444 in)
Inside diameter of crankshaft bushing, timing system side 38.016 - 38.0 mm (1.49669 - 1.49606 in)
Clearance between bushing and main journal (timing system
side)
0.025 - 0.057 mm (0.00098 - 0.00224 in)
CRANKSHAFT SEAT ( CLUTCH SIDE)
Specification
Desc./Quantity
Diameter of crankshaft main journal, clutch side 53.97 - 53.961 mm (2.12480 - 2.12444 in)
Inside diameter of crankshaft bushing on clutch-side flange 54.019 - 54.0 mm (2.12673 - 2.12598 in)
Clearance between bushing and main journal (clutch side) 0.030 - 0.058 mm (0.00118 - 0.00228 in)
Slot packing system
•
Fit both pistons on the connecting rods.
•
Working from both sides, fit the gasket
between the crankcase and the cylin-
der on the crankcase.
•
Fit both cylinders.
•
Take the left cylinder piston to TDC and
lock crankshaft rotation.
Specific tooling
020675Y Service shaft gear lock
Characteristics GRISO 8V - 1200
CHAR - 20
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