Impreza L Sedan F4-2.2L SOHC (1997)
CAUTION: Leave two or three threads of bolt (1) engaged to retain valve rocker assembly.
b) Equally loosen bolts (5) through (8) all the way, being careful that knock pin is not gouged.
2) Manually remove lash adjusters where air is trapped.
CAUTION: If lash adjuster is difficult to remove manually, use pliers. Be careful not to scratch lash adjuster.
3) Bleed air from hydraulic lash adjuster as described below:
a) While dipping hydraulic lash adjuster in engine oil, as shown in Figure, push check ball in using a 2 mm (0.08 in) diameter round bar.
b) With check ball pushed in, manually move plunger up and down at one second intervals until air bubbles disappear.
c) After air bubbles disappear, remove round bar and quickly push plunger in to ensure it is locked. if plunger does not lock properly, replace
hydraulic lash adjuster.
CAUTION: Leave hydraulic lash adjuster (after air is bled) in engine oil until it is ready for installation.
4) Using Special Tool (ST);
a) Insert lash adjuster into ST, and fill ST with engine oil. Using a 2 mm (0.08 in) diameter rod, push check ball in.
ST 499597000 OIL SEAL GUIDE
d) With check ball pushed in, push plunger at an interval of one second.
c) Move plunger up and down until air bubbles are no longer emitted from lash adjuster.
NOTE: Hold hydraulic lash adjusters vertically during air bleeding.
5) Remove the rod. Push plunger to ensure that air is completely bled out.
CAUTION: If plunger does not properly lock (when pushed), replace lash adjuster with a new one.
6) Fill rocker arm's oil reservoir with engine oil and install lash adjuster.
CAUTION:
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Do not rotate lash adjuster during installation.
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Be careful not to scratch the oil seal.