Timing Gears; Flywheel - Chevrolet 10 1971 Series Chassis Service Manual

Fig. 17L— Checking Timing Gear Backlash
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 as outlined in Section 6M.
5. Align timing gear marks then remove the two cam­
shaft thrust plates screws by working through holes
in the camshaft gear (fig. 15L).
6. Remove the camshaft and gear assembly by pulling
it out through the front of the block.
Support camshaft carefully when re­
NOTE:
moving so as not to damage camshaft bearings.
Installation
1. Install the camshaft and gear assembly in the engine
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. 15L).
Push camshaft into position. Install camshaft thrust
plate to block screws and torque to specifications.
Fig. 1 8 L— Removing Crankshaft Gear
s -
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
be not less than .004" nor more than .006".
6. Install fuel pump as outlined in Section 6M„
7. Install grille as outlined in Section 13.
8. Install crankcase front cover as outlined.
9. Install valve lifters as outlined.

Timing Gears

Replacement
With camshaft removed, crankshaft gear may be re­
moved using Tool J-8105 (fig. 18L). To install crankshaft
gear use Tool J-5590 (fig. 19L).
replacement, refer to " Camshaft Disassembly" in the
Chassis Overhaul Manual.

Flywheel

Removal
cu.
(A ll Except 292 in. Engines)
1. Remove transmission and/or clutch housing and
clutch from engine.
2. Remove flywheel retaining bolts
flywheel.
(292 cu. in. Engines)
1. Remove transmission and/or clutch housing and
clutch from engine.
2. Mark relationship of flywheel and crankshaft so that
dowel holes can be aligned in their original positions
on assembly.
3. Remove engine oil pan and rear main bearing cap.
4. Remove flywheel retaining bolts and drive crankshaft
dowels out of flywheel and crankshaft. Rotate crank­
shaft as necessary so dowels clear cylinder block.
5. Remove flywheel and discard used dowel pins.
Installation
(A ll Except 292 cu. in. Engines)
1. Clean the mating surfaces of flywheel and crankshaft
to make certain there are no burrs.
2. Install flywheel on crankshaft and position to align
Fig. 19L— Installing Crankshaft G ear
ENGINE 6-23
For camshaft gear
and r e mo v e
10-30 CHEVROLET TRUCK SERVICE MANUAL