Chevrolet 10 Series 1967, Service Manual

Page: 316 / 605

ENGINE 6-36
slowly, or attach an auxiliary starter switch and
"bump” the engine over, until the push rod is in
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 indi­
cator with specifications.
6
. Continue to rotate the engine until the indicator 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.
8
. Install and adjust valve mechanism as outlined.
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 push rod as outlined in Section
6
M.
5. Complete camshaft removal as follows:
CAUTION:
All camshaft journals are the same
diameter and care must be used in removing
camshaft to avoid damage to bearings^
On 283 and 327 cu. in Engines:
Remove camshaft sprocket to camshaft bolts then
remove sprocket and timing chain together. Sprocket
is a light fit on camshaft. If sprocket does not come
off easily a light blow on the lower edge of the
sprocket (with a plastic mallet) should dislodge the
sprocket.
Install two 5/16" x 18 x 4" bolts in camshaft bolt
holes then remove camshaft (fig. 22V).
On 366 cu. in. engines:
Align the timing gear marks then remove the two
camshaft thrust plate screws through holes in the
camshaft gear (fig. 23V).
Remove camshaft and gear assembly.
Installation
NOTE:
Whenever a new camshaft is installed
coat camshaft lobes with Molykote or its
equivalent.
283 and 327 cu. in. Engines
1. Lubricate camshaft journals with engine oil and in­
stall camshaft.
2. Install timing chain on camshaft sprocket. Hold the
sprocket vertical with the chain hanging down, and
orient to align marks on camshaft and crankshaft
sprockets. Refer to Figure 41.
3. Align dowel in camshaft with dowel in hole in cam­
shaft sprocket then install sprocket on camshaft.
Refer to Figure 20V.
4. Draw the camshaft sprocket onto camshaft using the
mounting bolts. Torque to specifications.
5. Lubricate timing chain with engine oil.
6
. Install fuel pump push rod as outlined in Section
6
M.
7. Install grille as outlined in Section 13.
8
. Install crankcase front cover as outlined.
Fig. 2 3 V —Timing G e a r Marks
9. Install valve lifters as outlined.
366 cu. in. Engines
1. Install the camshaft and gear assembly in the engine
block, being careful not to damage camshaft bear­
ings on camshaft.
2. Turn crankshaft and camshaft so that the valve tim­
ing marks on the gear teeth will line up (fig. 47).
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. 24V). 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.
F ig . 24V —C heckin g Camshaft G e ar Runout
CHEVROLET TRUCK SERVICE MANUAL
TIMING
MARKS
THRUST
PLATE
SCREWS