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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.
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