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17
ENGINE
17.4.15
Checking/measuring the piston
17.4.16
Checking the piston ring end gap
-
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.
•
I
306591-10
-
Check the piston rings for damage.
If the piston ring is damaged:
-
Replace the piston ring.
•
I
-
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.
-
Measure the piston at the piston skirt, parallel to the gudgeon pin,at a distance
ofG.
Guideline
G
Distance
Piston - diameter
Size I
Size II
Info
•
I
Piston dimensions
-
Remove the piston ring from the piston.
-
Place the piston ring in the cylinder and align with the piston.
Guideline
I
Below the upper edge of the cylinder
-
Using special tool
Guideline
Piston ring end gap
Compression ring
304694-10
Oil scraper ring
I
Feeler gauge (590290411 00)
If the end gap is greater than the specified value:
-
Check/measure the cylinder.
If cylinder wear lies within the specified tolerance:
-
Change the piston ring.
-
Mount the piston ring with the marking facing upward.
Tip
An old piston ring can be used to clean the piston ring groove.
Info
Mount the piston ring with the marking facing upward.
7 mm (0.28 in)
94.93 ... 94.96 mm (3.7374 ...
3.7386 in)
94.94 ... 94.97 mm (3.7378 ... 3.739 in)
O
are marked on the piston head.
110 mm (0.39 in)
0,
measure the end gap.
I
:e; 1.00 mm (:e; 0.0394 in)
I
:e; 1.20 mm (:e; 0.0472 in)
(a
p. 229)
(a
p. 152)
153
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