Measuring Plastigage - Pontiac Grand Prix Service Manual

V-8
ENGINE 6-63
Fig. 6-110.002 Shim Positioned in Cap for Checking
Bearing Clearance
9. Form another new seal in the cap (Fig. 6-107).
10. Assemble the cap to the block and tighten to 120
Ib. ft. torque.
11. Remove the cap and inspect the parting line to
insure that no seal material has been compressed
between the block and the cap. Clean as necessary.
12. Apply a 1/16" bead of sealer from the center of
seal across to the external cork groove.
13. Reassemble the cap. Tighten to 120 Ib. ft. torque.
14. Install bame and oil pump.
15. Install oil pan (see Oil Pan
-
Remove and Replace).
MAIN BEARINGS
REMOVE
1. Remove oil pan (see Oil Pan
-
Remove and
Replace).
2. To gain access to bearing caps, remove oil bame. To
gain access to rear main, remove oil pump in addition
to oil bame.
3. Remove bearing cap of main bearing to be replaced.
4. Make a tool for removing upper half of bearing
shell
as
shown in Fig. 6-109.
5. Insert tool in oil hole qf crankshaft and rotate
crankshaft in usual direction of rotation. This will
cause
bearing to be moved from between shaft and
bearing seat.
6. Oil bearing surface of shell and install by inserting
plain end of bearing shell at indented side of bearing
seat and gently rotating shell into place by turning
shaft.
Fig. 6.111 Measuring Plastigage
8. Install bearing cap and check fit of bearing, using
Plastigage as outlined below.
CAUTION: Under no circumstances should bearing
caps be filed or shimmed in an effort to effect a fit.
PLASTIGAGE METHOD FOR DETERMINING
MAIN
BEARING CLEARANCE
When checking main bearing clearance with engine in
the car, place a .002" brass shim between the
crankshaft journal and the lower bearing in each
bearing cap next to the one being checked (Fig. 6-1 10).
Tighten all cap bolts to proper torque as follows: rear
-
120 lb. ft., all others 100 lb. ft. This causes the
crankshaft to be forced against the upper bearing and
insures an accurate measurement of the total clear-
ance.
I
I
I
NO. 1 NO. 2 CONNECTING
CONNECTING R O D C A P
R O D C + P
I
7. Install new bearing lower half by inserting in
Fig. 6-112 Crankshaft Positioned For Removal of N o
bearing cap so indentation in shell a d cap coincide.
1 and No. 2 Connecting
Rod Caps