18 ENGINE
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- The cylinder size
O
is labeled on the side of the cylinder.
- Using a straightedge and the special tool, check the sealing
area of the cylinder head for distortion.
I Feeler gauge (59029041100) (
I!!;!
p. 357)
Cylinder/cylinder head
sealing area distortion
:5 0.10 mm (:5 0.0039 in)
If the measured value does not meet specifications:
- Change the cylinder.
..
18.4.16 Checking/measuring the piston
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208
- Check the piston sliding surface for damage.
If the piston sliding surface is damaged:
- Replace the piston and, if necessary, the cylinder.
- Check that the piston rings move easily in the piston ring
grooves.
If the piston ring is stiff:
- Clean the piston ring groove.
Tip
An old piston ring can be used to clean the
piston ring groove.
- Check the piston rings for damage.
If the piston ring is damaged:
- Replace the piston ring.
•
Info
I
Mount the piston ring with the marking facing
upward.
- Check the piston pins for discoloration or signs of wear.
If the piston pin shows severe discoloration/signs of wear:
- Replace the piston pin.
- Place the piston pin in the connecting rod and check the
seating for play.
If the piston pin seating has excessive play:
- Replace the connecting rod and piston pin.