Oil Seal; Camshaft; Measuring Lobe Lift - Chevrolet CHEVY VAN G10 SERIES Service Manual

ENGINE 6-22
Fig. 1 8 L —Measuring Camshaft Lobe L ift
Installation
1. Clean gasket surfaces on block and crankcase fro n t cover.
2. Install centering T ool J-23042 in crankcase front cover
seal (Fig. 15L).
3. Coat the gasket w ith gasket sealer and place in position
on cover, th en install crankcase fro n t cover to block and
torq ue to specifications.
4. Remove centering tool.
N O T E : It is im portant th a t centering tool be used
to align crankcase fro n t cover so th at crankshaft
damper installation will not damage seal and to
position seal evenly around the damper surface.
5. Install crankshaft dam per as outlined.
6
. Install oil pan as outlined.
O IL SEAL (FR O N T COVER)
Replacement
W ith Cover Removed
1. W ith cover rem oved, pry old seal o u t o f cover from the
fro n t w ith a large screwdriver, being careful n o t to distort
cover.
2. Install new seal so th at open end o f the seal is tow ard the
inside o f cover, and drive it in to position w ith Tool
J-23042 (Fig. 16L).
C A U T IO N : Support cover at sealing area. (Tool
J-971 may be used as support.)
W ithout Cover Removed
1. With crankshaft pulley and dam per rem oved, pry old seal
o u t o f cover from the fro n t w ith a large screwdriver,
being careful n ot to damage the seal surface on the
crankshaft.
2. Install new seal so th a t open end o f seal is tow ard the
inside o f cover an d drive it in to position w ith Tool
J-23042 (Fig. 17L).

CAMSHAFT

Measuring Lobe Lift

N O T E : Procedure is similar to that used fo r check­
ing valve tim ing. If improper valve operation is
indicated, measure the lift of each push rod in
consecutive order and record the readings.
1. Remove valve m echanism as outlined.
2. Position indicator w ith ball socket adapter (T ool J-8520)
on push rod (Fig. 18L).
3. R o tate th e crankshaft slowly in th e direction o f rotatio n
until the lifter is on the heel o f th e cam lobe. A t this
point, the push rod will be in its low est position.
4. Set dial indicator on zero, then ro tate the crankshaft
slowly, or attach an auxiliary starter switch and "b u m p "
the engine over, un til the push rod is in the fully raised
position.
C A U T IO N : The distributor primary lead must be
disconnected from the negative post on the coil.
5. Com pare the to tal lift recorded from the dial indicator
w ith specifications.
6
. C ontinue to rotate the crankshaft until the indicator
reads zero. This will be a check on the accuracy o f the
original indicator reading.
7. I f cam shaft readings for all lobes are w ithin specifica­
tions, remove dial indicator assembly.
8
. Install and adjust valve m echanism as outlined.
Fig. 1 9 L —Tim ing Gear Marks
C H E V Y V A N S H O P M A N U A L