Crankshaft; Measuring Crankshaft End Play - Pontiac Grand Prix Service Manual

6-70
1 -
PONTIAC SERVICE MANUAL
Fig. 6-125 Measuring Side Clearance of Ring in
Groove
Oil Ring .015"-.055"
Incorrect ring gap indicates that wrong size rings are
being used. If rings are selected according to the size of
the bore (standard, .005" oversize, etc.), they should
have the proper gap. It should not be necessary to alter
ring gap by filing.
4.
Install rings on piston, using J 8021 or J 71 17 to
prevent breakage or fracture of rings, or damage to
pistons.
5. Measure side clearance of rings in ring groove (Fig.
6-125) as each ring is installed. Clearance with new
pistons and rings should be .0015"-.005OW.
If side clearance is excessive, piston should be
replaced.
REMOVE
In order to remove the crankshaft, the engine assembly
must be removed from the vehicle.
The crankshaft can then be removed and replaced
with cylinder heads, pistons, rods, manifolds and other
upper engine components installed, but the flywheel
clutch and transmission assemblies must be removed.
1. Remove engine and clutch (SM) as an assembly. See
ENGINE
-
REMOVE AND INSTALL.
2. Remove clutch (SM) and install engine on suitable
-
stand.
3. Remove spark plugs.
4. Remove engine oil pan.
5. Remove oil pump assembly and oil pump drive
shaft (Fig. 6-104).
6. Remove oil baMe and oil baMe tube.
7. Remove harmonic balancer.
8. Remove fuel pump.
9. Remove timing chain cover, gasket and O-ring seal.
10. Remove fuel pump eccentric and bushing (Fig.
6-96).
1 1. Remove sprockets and timing chain (Fig. 6-97).
12. Remove connecting rod caps.
CRANKSHAFT
I
CHECK
These checks are to be made with oil pan and baMe
removed and with all main caps and rods installed and
1
properly torqued.
1. Check end play (Fig. 6-126). Using hammer, tap
end of crankshaft at rear until it is tight against front
of thrust bearing (No. 4 main bearing). Measure
clearance between crankshaft counterweight and thrust
ring. Proper clearance is .003" to .009". If clearance
~utsidc these limits, a new thrust bearing in
-
required.
L
2. Check connecting rod side clearance. Using ham-
m e r
fron
,
gently tap lower end of connecting rodtoward
~t of engine. Measure clearance between rear of
c o ~ e c t i n g 16d and crankpin. Proper clearance is .006"
to .O1lM. If clearance is outside these limits, a new rod
or rods
is
required. Fig. 6-126 Measuring Crankshaft End Play