Maintenance
3425
−
1/A1
Winterthur Gas & Diesel Ltd.
3.2
Piston Rings
−
Removal
CAUTION
Damage Hazard: Do not open the piston rings too far. This will
cause damage to the piston rings.
Note: If the same piston rings will be installed again, record their positions.
1) Use the tool (94338 and 94338A,
) to remove the top, middle and bottom
piston rings (1). Make sure that you do not cause damage to the chrome-ceramic
surface.
2) Clean the piston ring grooves.
Fig. 4
94338
94338A
WCH00627
1
3.3
Piston Ring Clearance (Piston Removed)
Note: You can use a calliper gage, an inside micrometer set 94101 (paragraph
), or a piece of piston ring (paragraph
) to measure the piston
ring grooves.
3.3.1 Procedure with Calliper Gauge or Inside Micrometer Set
) or inside micrometer set (94101) to measure the
groove height at point A and point B. You must measure the groove height at a
minimum of four locations around the circumference of the piston head.
2) Record the value from the calliper gage (1) or inside micrometer set (94101).
3) If the clearance at point A or point B is more than the permitted value, you must
repair the piston head.
B
A
3
94357
WCH02244
Fig. 5
Possible Wear Shape
On Piston Groove
Note: If the clearance at point A and, or point B is more than the permitted
value, you must repair the piston head. For the maximum wear values,
refer to 0330
−
1 ,
.
Piston: Wear of Piston Rings and Ring Grooves
2016
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