10 Operate the turning gear to move the piston (001, Figure 8-67) until you can see the
piston rings (002) through the scavenge ports.
Fig 8-67 Piston ring - clearance
001
X1
002
X2
001
002
003
002
001
002
001
Worn edge on
chrome-ceramic layer
X2
X1
11 Measure the clearance of the first piston ring at an applicable position as follows:
11.1 Measure the clearance X1 and X2 with the feeler gauge.
NOTE: If there is an edge of worn material on the chrome-ceramic layer or in
the piston groove, you can not fully push the feeler gauge into the
groove.
NOTE: Clearance X2 can be more than zero, if the piston ring is tilted or if
there is contamination in the piston groove.
11.2 Record the total clearance X = X1 + X2.
12 If possible do Step 11 again on different positions of the first piston ring.
13 Do Step 11 and Step 12 again for the other piston rings.
14 Compare the recorded clearances with the maximum permitted values, refer to section
3.3 Clearances - general.
15 If the clearance is more than the permitted value, do as follows related to the defective
item:
15.1 Replace the defective piston rings.
15.2 Repair the defective piston head.
NOTE: For the repair of piston heads, speak to the nearest WinGD Service
Center.
16 Record the data that follow:
•
All dimensions
•
Date of the overhaul
•
Operation hours of the different components
•
Operation hours of the engine.
CLOSE UP
• None
X62DF
AA00-3403-00AAA-360A-A
Maintenance Manual Piston (installed) - do checks of the surface and clearances
Winterthur Gas & Diesel Ltd.
- 474 - Issue 002 2020-10
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