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6A2-10
1977 PONTIAC SERVICE MANUAL
BALL CHECK VALVE
RETAINER
J
BALL CHECK
VALVE
r
PLUNGER 8PR
BALL CHECK VALVE SPRING
(HIGH BALL LIFTER ONLY)
ROD
ROCKER FEED
METE RIP^
-
'
VALVE
f
RETAINER
SPRI&
268
Fig.
6A2-16
Hydraulic Valve Lifter
-
Exploded View
2. Rinse lifter ball and place it and the small spring in
retainer.
3. Rinse plunger and place on retainer so that seat on
plunger mates with ball.
4. Invert plunger with parts assembled thus far and after
rinsing lifter body, install body over spring and plunger.
5. Place lifter body on clean paper, rinse and install push
rod seat and retainer ring.
6. After lifter has been assembled, place in lifter box and
close lid to preserve cleanliness.
Test Leak-Down Rate
After all lifters have been assembled, the leak-down rate
must be checked before they are installed in the engine. Valve
lifter leak-down tester 5-5790 (Fig. 6A2- 17) is designed to test
leak-down rate of lifters to determine whether or not they are
within specified limits. As with previous service operations
concerned with lifters, cleanliness is paramount. The tester
cup and ram should be thoroughly cleaned, and testing
should be done in an area free of dust and dirt. The testing
procedure is described in the following steps:
1. Fill tester cup to approximately one inch from top
with special fluid which is available from tester manufacturer.
2. Swing weight arm up out of the way, raise ram, and
position lifter into boss in center of tester cup.
3. Adjust ram (with weight arm clear of ram) so that the
point is positioned on the set line (marked "S"). Tighten jam
nut to maintain setting.
4. Operate lifter through full travel of plunger by
pumping weight arm to fill lifter with test fluid and force out
air. (Lifter must be completely submerged at all times.)
Continue pumping for several strokes after definite resistance
is detected.
5. Raise weight arm to allow plunger spring to expand
fully; lower arm onto ram and commence turning crank
slowly (1 revolution every 2 seconds).
Time indicator travel from lower line (first line above
set line) to line marked .094 or 3/32", while still rotating cup
with crank (Fig. 6A2-17). Lifter is satisfactory if rate is
between 12 and 90 seconds.
Fig.
6A2-17
Testing Leak-Down Rate
CYLINDER HEAD OR GASKET
Remove
1. Drain cooling system and remove air cleaner.
2. Disconnect accelerator cable at bell crank on manifold
and fuel and vacuum lines at carburetor.
3. Remove intake and exhaust manifolds as previously
described.
4. Remove generator to cylinder head bracket bolts.
NOTE: If vehicle is equipped with power steering or
A/C, it will be necessary to remove the right side front
bracket completely in order to remove the cylinder head.
5. Disconnect wire harness from temperature sending
unit, leaving harness clear of clips on rocker arm cover.
6. Disconnect radiator and heater hoses at water outlet
housing and ground strap at cylinder head.
7. Disconnect spark plug wires and remove spark plugs.
8. Remove rocker arm cover. Back off rocker arm nuts,
pivot rocker arms to clear push rods and remove push rods.
9. Remove the cylinder head bolts, cylinder head and
gasket. Place cylinder head on two blocks of wood to prevent
damage.
Replace
I . Place a new cylinder head gasket in position over
dowel pins on cylinder block (Fig. 6A2-18).
2. Carefully guide cylinder head into place over dowel
pins and gasket.
3. Coat heads and threads of cylinder head bolts with
sealing compound, part number 1052080 , or equivalent,
and install finger tight (Fig. 6A2-19).
4. Tighten the cylinder head gradually with a torque
wrench. Tighten bolts following sequence in Fig. 6A2-20. The
final torque should be 95 Ib. ft.
5. Complete installation by reversing removal procedure.
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