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Cylinder / piston assy
Piston rings-cylinder clearance
It is important that piston ring (A) be perfectly square to cylinder during measurement. To this end, fit the piston (9)
without the piston rings into the cylinder and place the piston ring to be measured on top of the piston.
Measure the piston ring end gap:
Top ring and second ring (nominal):
0.20 - 0.40
mm
Wear limit:
0.80
mm.
Oil scraper ring (nominal):
0.30 - 0.60
mm
Wear limit:
1.0
mm.
Refitting cylinder / piston assy
If you are using new cylinders and pistons, match cylinders and pistons from the same class.
Cylinder class is identified by a letter punched on cylinder top face in the cylinder / head contact surface. Piston class
is punched on the piston crown, between the two valve pockets.
If piston and cylinder were separated during disassembly, rotate piston rings so that their open ends are spaced 120
degrees apart. Note that piston ring mark must be facing up (pointing to piston crown).
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