Chevrolet 1988 Light Duty Truck Repair Manual page 341

Figure 18— Measuring Ring Clearance
T he o il c o n tro l rin g s are th re e p ie c e ty p e s ,
consisting of two rails and an expander.
Expander.
Lower rail.
Upper rail.
Upper compression ring. Use J 25220 (figure 5).
Lower compression ring. Use J 25220 (figure 5).
Flex all rings to make sure the rings are free. If
binding occurs at any point the cause should be
determ ined. If binding is caused by the ring groove,
correct by dressing the groove with a fine cut file. If
binding is caused by a distorted ring, check a new
ring.
M easu re (F ig u re 18)
• Ring clearance. Use a feeler gage as shown in
figure 18. Compare with " S pecifications" in
the proper section.
Installing the Piston Rings
(6.2 L Engines)
• All com pression rings are marked on the upper side
of the ring. When installing the com pression rings,
make sure the MARKED SIDE IS TOWARD THE
TOP OF THE PISTON.
GENERAL ENGINE MECHANICAL 6A-11
The top com pression ring is a keystone type.
The oil ring is a two-piece type, consisting of an
expander and a scraper ring.
IjJ M easu re (F ig u res 7 and 16)
Ring end gap as follows:
1. Select rings com parable in size to the piston
being used.
2. Slip the com pression ring in the cylinder bore;
then press the ring down into the cylinder bore
about 7 mm (1 /4-inch) above ring travel. Be
sure the ring is square with the cylinder wall.
3. Measure the space or gap between the ends
of the ring with a feeler gage (figure 16).
4.
R e fe r to " S p e c ific a tio n s "
section.
5.
If the gap between the ends of the ring is not
B-05078 as specified, remove
for fit.
I?
In sp ect (F ig u re 17)
Ring fit as follows:
1. Fit each com pression ring to the piston on
w hich it is going to be used.
2. Slip the outer surface of the top and second
com pression ring into the respective piston
ring groove (figure 17), to make sure that the
ring is free. If binding occurs at any point, the
cause should be determ ined. If binding is
caused by the ring groove, correct by dressing
the groove with a fine cut file. If the binding is
caused by a distorted ifing, check a new ring.
* A ssem b le
• Piston rings. Refer to the instructions furnished with
the parts package.
t j j M easu re (F ig u re 18)
• Ring clearance. Use a feeler gage as shown in
figure 18. Compare with " S pecifications" in the
proper section.
in th e p ro p e r
:he ring and try another