Pontiac FIREBIRD 1972 Service Manual page 598

6-86 1972 PONTIAC SERVICE MANUAL
tighten cap bolts to proper torque. (Do not tun;
crankshaft with plastic gage in place).
3. Remove bearing cap and using plastic gage scale on
envelope (Fig. 6-149), measure width of plastic gage
before removing it from the bearing or journal. If the
bearing clearance is between the specifications listed
below, the clearance is satisfactory. If the clearance
is more than the upper limit shown, replace the bear-
ing with the next undersize bearing and recheck
clearance. Bearings are available in standard size,
.00lV and .002" undersize.
ENGINE BEARING CLEARANCE
..............................................
307 NO. 1
.0008"
-
.0020"
307 NO. 2-3-4
........................................
.001 1 "
-
.0023"
..............................................
307 NO. 5
.0017"
-
.0033"
............................
All others (Exc. 455)
.0002"
-
.0017"
(Exc. small valve
#
1
location).
.........................................
.0005 "
-
.002 1 "
(Small valve
#
1
............................................
location) .003"
-
.0019"
Install a new rear main bearing oil seal in the cylinder
block and main bearing cap if the rear main bearing
was checked and/or replaced.
Replace oil pump, cylinder block to oil baffle tube,
and oil baffle if they were previously removed.
Replace oil pan, using new gaskets.
Fig. 6-1 49 Measuring Plastic Gage
CONNECTING ROD BEARINGS
REMOVE
Remove oil pan (see OIL PAN
-
REMOVE AND
REPLACE).
To gain access to numbers 5,6, 7 or 8 connecting rod
caps, it will be necessary to remove oil pump and oil
baffle. Pump must be removed as an assembly. Screen
tube is a press fit in pump body and must not be
rotated or removed.
Rotate crankshaft as necessary to bring crank pin
carrying bearing to be replaced straight down (Fig.
6- 150).
Remove bearing cap of bearing to be replaced.
Install rubber hose on connhcting rod bolts (Fig. 6-
151).
Push piston and rod assembly up far enough to allow
removal of bearing shell. Remove bearing shells from
rod and cap.
Inspect crank pin for damage, out-of-round, and ta-
per.
Reassemble cap and rod with new bearing shells and
check fit, using plastic gage as outlined below.
CAUTION: Under no circumstances should a
bearing cap be fled or shimmed in an effort to
effect a fit.
NOTE:
A
number of 2 661. equipped V-8's have
.OIO"
undersize crankpins. These crankshafts
may be identified by a
.OIO"
US. stamp on the
front of the No.
I
counterweight and the rear
of No. 8 counterweight. A check should be
made for this undersize crankshaft before re-
placing rod beanngs.
NO. 1 NO.
2 CONNECTING
CONNECTING ROD CAP
ROD CAP
1
Fig. 6 - 1 5 0 Crankshaft Positioned for Removal of No. 1 and
2
Connecting Rod Caps