Harmonic Balancer - Remove And Replace; Lower Front Timing Belt Cover; Remove And Replace; Crankshaft Timing Belt Sprocket Or - Pontiac tempest 1968 Service Manual

SIX C Y L I N D E R E N G I N E
6-19
can be checked by using a suitable dial indicator or
Prussian blue. When using dial Indicator, total run­
out should not exceed .002".
When prussian blue is used, a light coat should be
applied to face of valve only and valve rotated in its
seat. If blue appears all the way around valve seat,
valve seat and valve guide are concentric with one
another.
3. Check concentricity of valve stem and face of
valve. After cleaning prussian blue from valve and
seat, lightly coat valve seat with prussian blue again
and rotate valve in guide. If blue appears all the way
around valve, valve stem and valve face are concen­
tric with one another.
NOTE: Both tests in steps 2 and 3 are necessary
to insure proper valve seating.
IMPORTANT: If it is necessary to grind any pit
from rocker arm end of valve stem, feed end
squarely against grinding wheel. Only the extreme
end of the valve stem is hardened to resist wear.
Do not grind end excessively.
ASSEMBLE
1. Starting with No. 1 cylinder place exhaust valve
in the port and place valve spring and cap in position.
Place spring and cap on exhaust valves. Then using
J 8062 spring compressor, compress spring and in­
stall oil seal with J 22330 and valve keys. See that
seal is flat and not twisted in the valve stem groove
and that keys seat properly in valve stem groove.
NOTE: Place valve springs in position with closed
coil end toward cylinder head.
2. Assemble remaining valves, valve springs,
shields, spring caps, oil seals and valve locks in
cylinder head. Check seals by placing vacuum cup
of J 22330 over valve stem and cap, squeeze vacuum
cup to make sure no oil leaks past oil seal.
3. Install cylinder head as previously described.
HARMONIC BALANCER-REMOVE AND REPLACE
1. Loosen generator at adjusting bracket and pivot
bolt and remove fan belt from harmonic balancer.
On cars equipped with power steering, also remove
power steering pump belt from harmonic balancer.
2. Position fan so wide angles will be at top and
bottom, allowing access to balancer.
3. Remove harmonic balancer attaching bolt and
retainer washer.
4. Remove harmonic balancer using puller J 6978,
Use of a washer (manifold bolt washer) in end of
shaft will prevent tool damaging threads in crank­
shaft.
.4.-. .
Fig. 6-31 Lower Front Timing Cover Retaining Bolts
5. Install new harmonic balancer using suitable
instrument by reversing above steps, lining up key-
way in balancer with key on crankshaft.
6. Tighten harmonic balancer attaching bolt to
160 lb, ft. torque.
NOTE: Remove flywheel cover and lock flywheel
before tightening balancer bolt.
LOWER FRONT TIMING BELT COVER-
REMOVE AND REPLACE
1. Remove harmonic balancer, fan and water pump
pulley,
2. Remove two attaching bolts and remove cover
(Fig. 6-31).
3. Install cover by reversing above steps. Tighten
cover attaching bolts to 20 lb. ft.
CRANKSHAFT TIMING BELT SPROCKET OR
CRANKCASE COVER SEAL-REMOVE AND REPLACE
REMOVE
1. Remove upper front timing cover.
2. Align timing marks (Fig. 6-7).
3. Remove fan and water pump pulley.
4. Remove harmonic balancer.
5. Remove timing belt lower front cover (Fig.
6-31).
6. Loosen accessory drive mounting bolts to pro­
vide slack in timing belt.
7. Remove timing belt.