Maintenance
3425−1/A1
RT-flex58T-D
Winterthur Gas & Diesel Ltd.
5/ 7
3.2 Measurement with piston removed from cylinder liner
The measurement of the piston ring clearance has to be carried out on at least four
positions around the complete circumference of the piston head.
⇒ Remove the piston rings as described in section 4.
⇒ Clean the piston ring grooves.
Measuring method with calliper gauge:
⇒ Measure the groove height with calliper gauge 94357 at point A and B.
D
B
A
3
94357
POSSIBLE WEAR
SHAPE ON GROOVE
WCH02244
Measuring method with a piece of a piston ring:
⇒ Measure the thickness of piece of a piston ring (1).
⇒ Place piece of piston ring into the piston ring groove.
⇒ Measure gap ’x2’ between the face of piston ring and groove with feeler gauge
94122.
⇒ Evaluate the piston ring clearance with the following data:
CL = GH − RT (mm)
− CL = CLearance
− GH = Measured piston ring Groove Height (mm)
− RT = Nominal piston Ring Thickness (mm)
E
3
94122
x2
(1)
WCH02244
If the clearance at point A and/or B exceeds the permitted value, the piston head
has to be reconditioned. For the maximum wear data see Clearance Table 0330−1
’Piston and Piston Rings’.
A piston head with clearances close to the maximum value may not be further used
as the expected remaining lifetime is too short.
2013-08
Checking Wear of Piston Rings and Ring Grooves with Four Piston Rings
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