Cloyes Hex-A-Just 9-3149A (BB Chevy Gen VI) User Manual

Page 2

April 24, 2009

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 bolts or equivalent.
Install these bolts slightly loose.

Adjust the Camshaft Timing. Do NOT try to turn
the camshaft with the bushing unless there is

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.

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).

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.

Install the Timing Cover and Gasket. Install the timing cover and gasket using a small
amount of gasket sealer if desired.

Inserting Offset Bushing

(Figure 1)

Adjusting the Timing

(Figure 2)