10 Record the values.
11 Use the formula that follows to calculate the piston ring clearance:
C = GH - RT with the values that follow:
•
C = clearance
•
GH = measured height of the piston ring groove (mm)
•
RT = nominal piston ring thickness (mm).
12 Do Step 8 to Step 11 again for the other piston rings and piston grooves.
13 Compare the calculated clearances with the maximum permitted values, refer to section
3.3 Clearances - general.
14 If a clearance is more than the permitted value, do Step 14.1 or Step 14.2 related to the
defective item.
14.1 Replace the piston rings.
14.2 Repair the piston head.
NOTE: For the repair of piston heads, speak to the nearest WinGD Service
Center.
15 Measure the diameter of the piston skirt.
16 Compare the measured value with the minimum permitted value, refer to section 3.3
Clearances - general.
17 If the piston skirt is too small, install a new piston skirt.
18 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
X72DF
AA00-3403-00AAA-360B-A
Maintenance Manual Piston (removed) - do checks of the surface and clearances
Winterthur Gas & Diesel Ltd.
- 492 - Issue 002 2020-10
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