30/ENGINE - WORK ON INDIVIDUAL PARTS 129
19.12Checking/measuring the cylinder
300102-10
– Check the O-ring of the chain adjuster for damage and wear.
» If there is damage or wear:
– Replace the O-ring.
– Check the cylinder bearing surface for damage.
» If the cylinder bearing surface is damaged:
– Change the cylinder and piston.
– Measure the cylinder diameter at several places in the and axes using a
micrometer to check for oval wear.
– To determine the size, measure the cylinder at a distance from the top edge of
the cylinder.
Guideline
Distance 55 mm (2.17 in)
Cylinder - bore diameter
Size I 102.000… 102.012 mm (4.01574…
4.01621 in)
Size II 102.013… 102.025 mm (4.01625…
4.01672 in)
300103-10
– The cylinder size is marked on the side of the cylinder.
400376-10
– Check the sealing area of the cylinder head for distortion using a straight edge and
the special tool.
Feeler gauge (59029041100) ( p. 248)
Cylinder/cylinder head - sealing area
distortion
≤ 0.10 mm (≤ 0.0039 in)
» If the measured value does not equal the specified value:
– Change the cylinder.
19.13Checking/measuring the piston
400484-10
– Use the special tool to measure clearance of the piston rings in the piston ring
groove.
Guideline
Piston ring - groove clearance ≤ 0.08 mm (≤ 0.0031 in)
Feeler gauge (59029041100) ( p. 248)
» If clearance is larger than the specified value:
– Change the piston and piston rings.
– Check/measure the cylinder. ( p. 129)
300099-10
– Check the piston bearing surface for damage.
» If the piston bearing surface is damaged:
– Change the piston and, if necessary, the cylinder.
– Check that the piston rings can move easily in the piston ring grooves.
» If the piston ring is stiff:
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