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3 5 0 AND 4 0 3 ENGINE
6A4-11
Fig. 6A4-20 Installing Ball Check Valve
8. Install adapter BT- 105-2 in reservoir of Tester BT-60,
then fill reservoir with Hydraulic Lifter Test Fluid BT-59 to
1/2" below top of reservoir.
9. Place assembly into the tester cup.
10 Position the 1/4" steel ball on the push-rod seat.
Lower tester ram until it contacts the steel ball.
11. Allow ram to move downward by its own weight
until air bubbles disappear.
12. Raise ram, then allow to lower. Repeat Step 11
several times or until all air is expelled from lifter.
NOTE: Do not attempt to expel1 air from lifter by
pumping on ram.
13. Adjust ram screw so that it contacts the steel ball
in the push-rod seat when the pointer is at the start line.
14. Raise arm, then start test by resting ram on steel ball.
Rotate reservoir one revolution every two seconds and time
the indicator from the start to the stop line. (Fig. 6A4-21)
Allowable leak-down rate is six seconds minimum for used
lifters and 9 to 60 seconds for new lifters.
15. If leak-down tolerance is within specifications, the
lifter can be placed in service without removing test fluid.
Installation
NOTE: Prime new lifters by working lifter plunger while
submerged in new engine oil. Lifters could be damaged
when starting engine if dry.
1. Install lifters and push rods into original position in
cylinder block. See note under Removal.
2. Install manifold gaskets and manifold.
3. Position rocker arms, pivots and bolts on cylinder
head.
4. Install valve covers, connect spark plug wires and
install air cleaner.
W
t. 1G IIT
IZOTATE RFSF R V O I R
O N F H F V O L U T l O h
Fig. 6A4-2 1 Valve Lifter Testing
CYLINDER HEAD AND GASKET
Removal
1. Drain radiator. By raising the rear wheels at least 24",
the block will drain enough coolant to remove the heads.
2. Remove intake manifold.
3. Remove exhaust manifold, see "EXHAUST
MANIFOLD REMOVAL".
4. Remove valve cover.
NOTE: Loosen or remove any accessory brackets which
interfere.
5. Remove ground strap from left cylinder head.
6. Remove rocker arm bolts, pivots, rocker arms and
push rods. (See Note, Step 7)
NOTE: Scribe pivots and keep rocker arms separated so
they can be installed in their original locations.
7. Remove cylinder head bolts and remove cylinder
head.
NOTE: If a clearance problem is encountered for
number 7 or 8 cylinder head bolts or push rods, pull
these out far enough to clear the block, secure with
rubber bands and remove or install with the cylinder
heads.
VALVES AND SPRING WITH
HEAD REMOVED
(FIG. 6A4-22)
Removal
1. Remove spark plugs.
2. Remove valve keys by compressing valve spring with
a tool such as BT-6413-2.
3. Remove valve spring rotators or retainers and springs.
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