New Holland 40 Series Repair Manual page 43

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43
Piston Ring Gap
1. Feeler Gauge 2. Ring
4. Check the piston ring gap width using a
feeler gauge, in a vertical position at the
top, middle and bottom of the bore,
Figure 43.
Top compression ring:
0.015--0.033 in (0.38--0.84mm).
2nd compression ring:
0.026--0.044 in (0.66-1.12mm).
Oil control ring:
0.015--0.033 in (0.38--0.84mm).
Piston Ring Installation
1. Piston Ring 2. Piston Ring
Expander
5 Ensure the correct expander is used to
remove or install rings, Figure 44.
25
Piston Ring Side Clearance
1. Piston Ring 3. Piston
2. Feeler Gauge
6. Using a new piston ring, check with a
feeler gauge the gap between the ring
and groove, Figure 45.
Top compression ring:
0.0044--0.0061 in (0.112--0.155mm).
2nd compression ring:
0.0039--0.0056 in (0.099--0.142mm).
Oil control ring:
0.0024--0.0041 in (0.061--0.104mm).
7. Install the piston rings, Figure 46, but
note the following:
NOTE:
Before installing new pistons and
rings into a used cylinder bore , remove the
high polish from the cylinder walls by honing
as previously described.
8. Install top and second compression rings
with the word top towards the top of the
piston. Ensure the ring gaps are stag-
gered a minimum of 40° from each other
on the diameter and with no gap on the
thrust side of the piston.