Pontiac Grand Prix Service Manual page 293

6-54 1969 PONTIAC SERVICE MANUAL
2. Check concentricitv of valve seat and valve guide.
- -
Concentricity
checked by u
of valie seat and valve
sing a suitable dial indica
guide cin be
[tor or prussian
blue. ~ h e h using a dial indicator, total run04 should
not exceed .002".
When prussi:
applied to
th
rotated in its
in blue is used, a light
I
,e face of the valve only
seat. If blue appears all
t
coat should be
and the valve
he way around
valve seat, the valve sea; and valve ghde are
concentric with one another.
I
3. Check concentricity of valve stem and face of valve.
I
After cleanin
following prec
~russian blue
~g pru&ian blue from
\
ceding check, lightly coat
and rotate valve in guide.
ralve and seat
valve seat with
If blue appears
911 the way around valve, the valve stem and ialve
face are concentric with one another.
I
NOTE: Both tests in steps 2 and 3 are necessary to
insure proper valve seating.
FITTING VALVE STEMS TO GUIDES
Correct valve stem clearance for valve guides is .0016"
to .0033" for intake valve and -0021" to .0038" for
exhaust valve.
Valves with oversize stems are available in .00 l", .003"
and .005" larger than standard. The same valve stem
to guide clearance applies for oversize stems.
Oversize reamers are required to enlarge valve guide
holes to fit the oversize stems. When the reamer is
turned through valve guide, it will size hole to fit valve
stem according to above limits.
Carefully ream valve guide using valve guide reamer J
5830-1 for .003" oversize stems and valve guide reamer
J 6621 for .005" oversize stems (Fig. 6-93). For best
results when installing .005" oversize valve stem, use
.003" oversize reamer first and then ream to .005"
oversize. Always reface valve seat after reaming valve
guide.
NOTE: Valves are marked .001, .003 or
.005
with
colored ink.
CYLINDER HEAD AND VALVES
-
ASSEMBLE
1. Install valves, valve springs, valve stem .shields,
valve spring retainer cups, valve stem seals and
retainer cup locks, using suitable spring compressor.
The valve stem seals must be installed in the second
groove (from end of stem). Valve stem seal installer
and tester J 22330 can be used to install this seal (Fig.
6-80). Where necessary, install new umbrella
type
seal
using suitable plastic protector over end of valve stem.
After valves have been installed, the suction cup end of
special tool J 22330 should be used to test for leaks
between the valve spring retainer cup and valve stem
Fig. 6-94 Harmonic Balancer
seal (Fig. 6-81). The suction cup will tend to be held to
the valve spring retainer cup by suction when seal is
satisfactory. If a leak is detected, replace seal or valve
spring retainer cup as necessary. It is important to
have a positive seal between the valve spring retainer
cup and valve stem seal to prevent excessive amounts
of oil from being drawn down the valve stem which
will cause exhaust smoke and oil consumption.
2. Install spark plugs.
HARMONIC BALANCER
-
TIMING CHAIN COVER
AND GASKET -TIMING CHAIN AND
SPROCKETS
-
OIL SEAL
-
FUEL PUMP
ECCENTRIC
HARMONIC BALANCER - REMOVE AND RE-
PLACE
1. Loosen generator at adjusting strap and lower 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 (Fig. 6-94).
3. Remove crank pulleys and reinforcing plate.
4. Remove harmonic balancer attaching bolt and
retainer washer.
5. Remove harmonic balancer by sliding it off end of
crankshaft.
NOTE: Do not pry on O.D. of harmonic balancer.
Harmonic balancer is a rubber mounted inertia member
and balance could be affected.