Remove And Replace; Assembly-Recondition - Pontiac tempest 1968 Service Manual

6 - 6 4
1968 P O N T I A C SERVICE M A N U A L
RIDGE CAUSED BY CYLINDER WEAR
F i g . 6-112 Cylinder Ring Ridge
crankpin or bearing. If the bearing clearance Is
between .0005" and .0025", the clearance is satis­
factory. If clearance is more than .0025", replace
bearing with the next size undersize bearing and
recheck clearance. Bearings are available i n .001"
and .002" undersize.
4. R o t a t e the c r a n k s h a f t a f t e r b e a r i n g adjustment
to be sure bearings are not tight.
CONNECTING ROD AND PISTON ASSEMBLY-
REMOVE AND REPLACE
REMOVE
1. Remove o i l pan, o i l baffle and o i l pump (see
Oil Pan - Remove - and Replace).
2. Remove intake manifold and cylinder head on
bank f r o m which piston is to be removed.
3. Rotate crankshaft so crankpin carrying assem­
bly to be replaced projects straight downward ( F i g .
6-111).
4. Remove ring ridge (Fig. 6-112) using suitable
ring ridge remover.
5. Remove bearing cap and install connecting rod
bolt guide set J 5239.
6. Carefully remove connecting rod and piston
assembly by pushing out with knurled handle of long
guide (Fig. 6-113).
REPLACE
1. Install connecting rod bolt guide set on con­
necting rod bolts with long handle guide on same
side as o i l groove in rod.
2. Using J 6647 or J 5684 (Fig. 6-114) ring com­
pressor, insert piston and connecting rod assembly
Into cylinder so that notch in top of piston is toward
front of engine. Be certain o i l spurt hole (Fig. 6-121)
in connecting rod is toward camshaft.
J-5239
F i g . 6-113 Connecting Rod Bolt G u i d e Set Installed
3. F r o m beneath engine, pull connecting rod, with
bearing shell i n place, into position against crankpin.
4. Remove guide set J 5239. - Install bearing cap
and cap nuts and tighten to 43 l b . f t . torque.
5. Replace o i l pump and o i l baffle, i f they were
removed.
6. Install cylinder head and intake manifold.
CONNECTING
ROD AND PISTON ASSEMBLY-
RECONDITION
NOTE; Use care at all times when handling and
servicing connecting rods and pistons. To prevent
- possible damage to these units, do not clamp rod
or piston in vise since they may become distorted.
350 J 6647
400 & 428 J 5684 .
F i g . 6 - 1 1 4 Instal ling Piston Assembly