Subaru EA190V, Service Manual

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(4) If adjustment is necessary, proceed as follows:
a) Hold valve adjusting bolt with tongs and loosen the valve lock nut
b) Turn valve adjusting bolt to obtain the specified clearance.
c) Fix the valve adjusting bolt with tongs, then fix the valve lock nut with spanner.
d) Recheck valve clearance after tightening the valve lock nut
——
torque value
：
6±2N.m
e) Set the new gasket aligning the projection of the new gaskets with the projection of the cylinder head;
f) Install the cylinder head cover and tighten the four bolts to the specified torque.
bolt torque value
：
8±2N.m
Adjusting bolt
—
screw in: valve clearance becomes smaller
Adjusting bolt
—
screw out: valve clearance becomes bigger
CAUTION:
Clearance too big: Intake and exhaust valve opening delay will shorten the intake and exhaust time, lower
the opening height of the valve and change normal distributing phase to result in power lowering from the
intake lack and exhaust incomplete. Furthermore, also make vale train parts knock increasing and wearing
quick.
Clearance too small: After running, engine parts will be heated to expand and push the valve open,
making the engine closing not tight and result in leaking, power lowering, serious carbon deposit or burn
on the valve surface, even valve impacting the piston.
Adjusting bolt
Lock nut
Rocker shaft
Rocker
Rocker