refills the high pressure chamber with non-aerated
oil.
(e) Remove probes to allow check balls to seat.
(f) Recheck for sponginess. If the lash adjuster
sponginess is not completely or nearly eliminated,
then repeat procedure.
(g) If the spongy condition cannot be removed,
replace effected rocker arm(s).
(6) Install cylinder head cover(s).
PISTONS
Pistons are machined to two different weight spec-
ifications and matched to rods based on weight. All
piston and rod assemblies weigh the same to main-
tain engine balance.
FITTING PISTONS
Piston and cylinder wall must be clean and dry.
Piston diameter should be measured 90 degrees to
piston pin at size location shown in (Fig. 21). Cylin-
der bores should be measured halfway down the cyl-
inder bore and transverse to the engine crankshaft
center line. Refer to Engine Specifications. Pistons
and cylinder bores should be measured at nor-
mal room temperature, 70°F (21°C).
PISTON PINS
The piston pin is full floating and is held in place
by lock rings. Pistons and rods are weight matched
for balance. Do Not switch pistons with other
rods. Piston and Rods are serviced as an assembly
for balance.
Fig. 19 Rocker Arm Positioned On Base Circle Of
Camshaft
1 – CAMSHAFT BASE CIRCLE
2 – HIGH-PRESSURE CHAMBER
Fig. 20 Purging Air From Lash Adjuster
1 – SPECIAL TOOL 8351
2 – OIL AIR RELIEF SERVICE ACCESS HOLE
3 – ROCKER ARM ASSY
4 – INTERNAL CHECK BALL
5 – VALVE TIP
6 – HYDRAULIC LASH ADJUSTER WITHIN ROCKER ARM
Fig. 21 Piston Measurements
LH 3.2/3.5L ENGINE 9 - 95
SERVICE PROCEDURES (Continued)
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