30/ENGINE - WORK ON INDIVIDUAL PARTS 104
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– Piston size is marked on the piston head.
20.14Checking the piston ring end gap
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– Remove the piston ring from the piston.
– Place the piston ring in the cylinder and align it with the piston.
Guideline
Under the upper edge of the cylinder 10 mm (0.39 in)
– Measure the end gap with special tool .
Guideline
Piston ring end gap ≤ 0.5 mm (≤ 0.02 in)
Feeler gauge (59029041100) ( p. 196)
» If the end gap is more than the specified value:
– Check/measure the cylinder. ( p. 102)
» If the cylinder wear is within the tolerance range:
– Change the piston ring.
– Mount the piston ring with the marking facing toward the piston head.
20.15Checking the piston/cylinder mounting clearance
– Check/measure the cylinder. ( p. 102)
– Check/measure the piston. ( p. 103)
– The smallest piston/cylinder mounting clearance is the result of the smallest cylinder bore diameter minus the largest piston diam-
eter. The largest piston/cylinder mounting clearance is the result of the largest cylinder bore diameter minus the smallest piston
diameter.
Guideline
Piston/cylinder - mounting clearance
New condition 0.015… 0.057 mm (0.00059… 0.00224 in)
Wear limit 0.150 mm (0.00591 in)
20.16Work on the cylinder head
Info
The following operations apply to both cylinder heads.
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– Remove oil pressure switch .
Info
This only applies to the front cylinder head!
– Remove coolant temperature sensor .
– Remove screw .
– Remove vacuum connection .
– Remove O-rings .
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