Removal; Installation - Chevrolet 30 Series 1967 Service Manual

Fig. 14L—Measuring Camshaft Lobe Lift
3. Rotate the torsional damper slowly in the direction
of rotation until the lifter is on the heel of the cam
lobe. At this point, the push rod will be in its lowest
position.
4. Set dial indicator on zero, then rotate the damper
slowly, or attach an auxiliary starter switch and
"bump" the engine over, until the push rod is in the
fully raised position.
CAUTION: The primary distributor lead must
be disconnected from the negative post on the
coil and the ignition switch must be in the on
position. Failure to do this will result in a
damaged grounding circuit in the ignition switch.
5. Compare the total lift recorded from the dial indica­
tor with specifications.
. Continue to rotate the crankshaft until the indicator
6
reads zero. This will be a check on the accuracy of
the original indicator reading.
7. If camshaft readings for all lobes are within speci­
fications, remove dial indicator assembly.
. Install and adjust valve mechanism as outlined.
8

Removal

1. Remove valve lifters as outlined.
2. Remove crankcase front cover as outlined.
3. Remove grille as outlined in Section 13.
4. Remove fuel pump as outlined in Section
5. Align timing gear marks then remove the two cam­
shaft thrust plates screws by working through holes
in the camshaft gear (fig. 15L).
. Remove the camshaft and gear assembly by pulling
6
it out through the front of the block.
NOTE: Support camshaft carefully when r e ­
moving so as not to damage camshaft bearings.

Installation

1. Install the camshaft and gear assembly in the engine
T IM IN G
M A R K S
TH RUST
PLATE
S C R E W S
block, being careful not to damage camshaft bearings
or camshaft.
2. Turn crankshaft and camshaft so that the valve tim­
ing marks on the gear teeth will line up (fig. 19L).
Push camshaft into position. Install camshaft thrust
plate to block screws and torque to specifications.
3. Check camshaft and crankshaft gear run out with a
dial indicator (fig. 16L). The camshaft gear run out
should not exceed .004" and the crankshaft gear run
out should not exceed .003".
4. If gear run out is excessive, the gear will have to be
removed and any burrs cleaned from the shaft or
the gear will have to be replaced.
5. Check the backlash between the timing gear teeth
with a dial indicator (fig. 17L). The backlash should
not be less than .004" nor more than .006".
M.
6
Fig. 15L—Timing G e a r Marks
Fig . 16 L —Checking Camshaft G e ar Runout
CHEVROLET TRUCK SERVICE MANUAL
ENGINE 6-21