Pontiac tempest 1968 Service Manual page 287

6-70 1968 P O N T I A C SERVICE MANUAL
11. Remove sprockets and timing chain (Fig. 6-96).
12. Remove connecting rod caps.
NOTE; Mark connecting rod caps for proper
reinstallation.
13. Remove main bearing caps from block.
NOTE; Before removing crankshaft, tape threads
of connecting rod holts to prevent damage to crank­
shaft. Depress pistons until connecting rods are
free of crankshaft*
14. L i f t crankshaft from block.
REPLACE
1. With upper bearings Installed, position crank­
shaft in block.
2 . Install main bearing caps (with bearing shells
in place) but do not tighten retaining bolts.
3. Pull connecting rods and piston assemblies into
place, rotating crankshaft as necessary to properly
seat rods.
NOTE: Make sure upper bearings remain in
proper position*
4. Remove tape f r o m connecting rod threads and
install connecting rod caps (with bearings) and r e ­
taining nuts, but do not tighten.
5. Check f i t of a l l main and rod bearings with
plastigage and Install proper sized new bearings.
6. Tighten rear main bearing cap to 120 l b . f t .
torque and a l l remaining bearing caps 100 l b . f t .
torque. Tighten connecting rod bearing cap retain­
ing nuts 43 l b . f t . torque.
7. Install sprockets and timing chain, making sure
timing marks on sprockets are aligned properly
(Fig. 6-96).
8. Install fuel pump eccentric and bushing and i n ­
sert sprocket retaining bolt with washer. Tighten
securely.
9. Install timing chain cover, new cover gasket
and new O-ring seal.
10. Install fuel pump.
11. Install harmonic balancer.
12. Install o i l baffle and oil baffle tube.
13. Install o i l pump drive shaft and o i l pump
assembly.
14. Install engine o i l pan.
15. Install spark plugs.
16. Remove engine from stand and Install clutch
(SM) t o engine,
17. Install complete assembly in vehicle.
ENGINE BLOCK CORE HOLE PLUGS
AND OIL PASSAGE PLUGS,
INSPECT AND REPLACE
Engine moving part failures may be caused by lack
of proper lubrication. In such case i t may be nec­
essary to trace o i l supply i n the block to determine
area of obstruction. Oil pressure drop may be
caused by leaking o i l passage plugs. For these
reasons the following procedures and block i l l u s t r a ­
tions are provided.
NOTE; Oil circulation diagram is provided in the
engine lubrication section® Figs. 6-127, 6-128, and
6-129 also show the various location of water
jacket core hole plugs.
a. With cylinder block inverted, use pen light
to see that passage from o i l pump to f i l t e r is
open (Fig. 6-129).
b. Check passage from filter outlet to rear
main bearing by inserting wire i n o i l f i l t e r outlet
passage and using pen light to see that wire is
visible in passage to rear main bearing (Fig. 6-128).
c. Visually check passage from each main bear­
ing to corresponding camshaft bearing (Fig. 6-129).
d. Check passage from f i l t e r outlet (through
left o i l gallery) to main bearings. Use rubber
hose to blow smoke in o i l f i l t e r outlet while ob­
serving to see that smoke passes out passages
leading to a l l main bearings.
e
a
With cylinder block right side up, check o i l
passages to left bank lifter bosses. Use rubber
F i g . 6-126 Drain Holes in Lifter G a l l e r y