Standard Procedure - Hydraulic Lash Adjuster Bleeding; Removal - Chrysler 300M Service Manual

9 - 34 ENGINE
ROCKER ARM / ADJUSTER ASSEMBLY (Continued)
STANDARD PROCEDURE - HYDRAULIC LASH
ADJUSTER BLEEDING
Use this procedure to manually bleed aerated oil
from the lash adjuster and remove sponginess.
(1) Run the engine, bringing it to operating tem-
perature in order to freshly pressurize and warm the
valvetrain system oil supply.
(2) Remove cylinder head cover(s).
(3) Ensure the rocker arm is positioned on the
base circle of the cam (Fig. 37). Rotate engine as nec-
essary.
(4) For intake rocker arm positions:
(a) Adjust Special Tool 8351 Release Probe's
gauge pin to extend approximately 20 mm (0.787
in.). Then, carefully insert the release probe gauge
pin into the lash adjuster service access hole (Fig.
38).
CAUTION: If probe tip breaks off within the lash
adjuster, replace the affected rocker arm.
(b) Gently unseat lash adjuster's internal check
ball.
(c) While the internal
unseated, press the rocker arm into the valve tip,
allowing the lash adjuster to fully collapse. Hold
this fully collapsed position for about one second,
or longer.
(d) Slowly release the rocker arm, thereby
allowing the lash adjuster to extend, which in turn
refills the high pressure chamber with non-aerated
oil.
(e) Remove probe to allow check ball 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).
(5) For exhaust rocker arm positions:
(a) Adjust Special Tool 8351 Release Probe
gauge pin to extend approximately 20 mm (0.787
in.). Then, using two release probes, carefully
insert gauge pins into the lash adjuster service
access holes (Fig. 38).
CAUTION: If probe tip breaks off within the lash
adjuster, replace the affected rocker arm.
check ball is held
(b) Gently unseat BOTH lash adjuster's internal
check ball at the same time.
(c) While the internal
unseated, press the rocker arm into the valve tip,
allowing the lash adjuster to fully collapse. Hold
this fully collapsed position for about one second,
or longer.
(d) Slowly release the rocker arm, thereby allow-
ing the lash adjuster to extend, which in turn
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).
Fig. 37 Rocker Arm Positioned On Base Circle Of
Camshaft
1 - CAMSHAFT BASE CIRCLE
2 - HIGH-PRESSURE CHAMBER

REMOVAL

CAUTION: The rocker arm shafts are hollow and are
used as lubrication oil passages. The rocker arm
and shaft assembly on the RIGHT side of the
engine has an oil passage hole from the cylinder
head to the third rocker shaft support. The rocker
arm shaft assembly on the LEFT side of the engine
has an oil passage hole from the cylinder head to
the second rocker shaft support.
LH
check ball is held