April 29, 2009
© Copyright 2007, Cloyes Gear Company. All rights reserved 9-3145B 2
4. Insert the Hex-A-Just® Timing Bushing. Insert the offset bushing (with the Hex hole)
into the slot in the camshaft sprocket hub. Rotate it with a 1/4" Hex Wrench so that the
timing mark on the bushing points away from the center of the hub (Figure 1). The Hex-A-
Just® Adjustable Timing Bushing is infinitely adjustable so you can fine adjust your
engine's CAMSHAFT TIMING to EXACTLY WHERE
YOU WANT IT.
5. Mount the Camshaft Sprocket. Loop the chain
over the camshaft sprocket. Align the camshaft and
crankshaft timing marks and loop the chain around
the crankshaft sprocket. Lift the camshaft sprocket
into place on the camshaft, with the Thrust Bearing
and Hex-A-Just® Bushing in place. Be sure that the
timing mark aligns with the crankshaft timing mark,
and that the Thrust Bearing Race has not slipped off
of the shoulder on the sprocket hub. Bolt it in place using the three existing GM cam bolts
or equivalent. Install these bolts slightly loose.
6. Adjust the Camshaft Timing. Do NOT try to turn the
camshaft with the bushing unless there is NO LOAD on
the camshaft. There must be NO VALVE SPRING
PRESSURE against the camshaft or the Hex-A-Just®
bushing will SPLIT. Make sure that the three camshaft
bolts are LOOSE. For a simple installation, adjust the
Hex-A-Just® bushing to the desired timing setting
(Figure 2). For a more accurate installation, use a
degree wheel. The degree wheel method is strongly
recommended.
7. Torque Loose Bolts. Remove each of the three (3) Cam Sprocket mounting bolts, one
at a time, and apply the Thread Locking Compound, then torque each bolt to 300 in-lb
(25 ft-lb).
8. Lubricate the Timing Set. Make sure that the engine oil has a clear path to the timing
set through the lifter valley oil drain-back holes, or through some other means. A timing
set requires plenty of oil to survive. Before installing the timing cover gasket and timing
cover, pour plenty of assembly lube over the sprockets and bearings. Assembly lube will
stay on the sprockets until the engine is started.
9. Install the Timing Cover and Gasket. Install the timing cover gasket using a small
amount of gasket sealer if desired. Mount the timing cover and install and torque the ten
(10) mounting bolts.
Inserting Offset Bushing
(Figure 1)
Adjusting the Timing
(Figure 2)
(2 pages)
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