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6A1-20
1977 PONTIAC SERVICE MANUAL
5. Raise front of engine to provide maximum clearance
without imposing stress on associated engine parts.
6. Remove mount and bracket as a unit and separate by
removing stud nut.
7. Assemble new mount to bracket and position bracket
to engine studs, then install starter brace and air conditioning
compressor brace.
8. LooseIy install mount and bracket stud nuts and bolts.
Lower engine to place weight on mounts and measure bracket
clearance from side to side and fore and aft (Fig. 6A1-53).
Position mount to obtain best fit; torque bolts and nuts to
specifications.
9. Install bracket-to-mount nut removed from opposite
side and torque to specifications.
10. Remove support from front of engine and lower car
on hoist.
Rear Mount Replacement
The engine rear mount serves to locate the power train
fore and aft and from side to side; therefore, mark
relationship of rear mount to transmission support
crossmember to ensure proper alignment when a new mount
is installed.
1. Remove crossmember-to-mount bolts.
2. Raise transmission at extension to release weight from
mount.
3. Remove mount-to-transmission bolts; then remove
mount.
4. Install new mount to transmission.
5. While lowering transmission, align and start
crossmember-to-mount bolts.
6. Lower transmission. Align mount-to-crossmember to
maintain alignment of front mounts and tighten all mounting
bolts to specified torque.
CONNECTING ROD AND PISTON
ASSEMBLIES
Removal
1. Use a ridge reamer to remove any ridge and/or
deposits from the upper end of the cylinder bore.
NOTE: Before ridge and/or deposits are removed, turn
crankshaft until piston is at the bottom of stroke and
place a cloth on top of piston to collect the cuttings.
After ridge and/or
deposits are removed, turn
crankshaft until piston is at top of stroke and remove
cloth and cuttings.
2. Inspect connecting rods and connecting rod caps for
cylinder identification. If necessary, mark them.
3. Remove connecting rod cap and install Tool J 23627
on studs. Push connecting rod and piston assembly out of top
of cylinder block (Fig. 6A1-54).
NOTE: It will be necessary to turn the crankshaft
slightly to disconnect some of the connecting rod and
piston assemblies and push them out of the cylinder.
Disassembly
1. Remove connecting rod bearings from connecting
rods and caps.
Fig. 6A1-54 Removing Connecting Rod and Piston
Assembly
PISTON PIN
R E M O V E R
J-24086-8
Fig. 6 A l - 5 5 Removing Piston Pin
NOTE: If connecting rod bearings are being reused,
place them in a rack so they may be reinstalled in their
original rod and cap.
2. Remove piston rings by expanding and sliding them
off the pistons. Tool J 22249 is available for this purpose.
3. Place connecting rod and piston assembly on Tool J
24086-20. Using an arbor press and piston pin remover, J
24086-8, press the piston pin out of connecting rod and piston
(Fig. 6A1-55).
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