Cloyes Hex-A-Just 9-3149A User Manual

April 24, 2009

Installation Instructions
9-3149A Hex-A-Just® True Roller Timing Set

BEFORE YOU BEGIN: READ ALL OF THESE INSTRUCTIONS FIRST !!!

Note: The installation procedures which follow assume that the engine has been disassembled

and cleaned as it would be for a normal timing set change.

YOU WILL NEED:

TOOLS:
1/4" Hex Bit Socket or Hex Wrench
Torque Wrench
Hammer
Sleeve to fit over crankshaft for installing Crankshaft Sprocket
Degree Wheel (Optional, but Recommended)

SUPPLIES:
Assembly Lube or Camshaft Lube
Thread Locking Compound (LockTite7 #271 or equiv.)

1. Prepare the Engine. Loosen all rocker arms so that the camshaft can rotate freely.

2. Clean everything! Make sure that the engine mounting surfaces and timing set

components are as clean as possible. The life of the chain and sprockets depends on it.

3. Mount the Crankshaft Sprocket. Select the appropriate keyway for the camshaft timing

baseline desired. We recommend the Standard Timing position, which used the round
timing mark and round keyway mark. Carefully tap the sprocket onto the crankshaft using
a sleeve to protect the sprocket. Make sure that the sprocket is fully seated on the
crankshaft. Rotate the crankshaft until the appropriate crankshaft sprocket timing mark is
in the 12:00 position. Make sure that the number one piston is at top dead center.

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.

© Copyright 2007, Cloyes Gear Company. All rights reserved. 9-3149A 1

April 24, 2009

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

Inserting Offset Bushing

(Figure 1)

using the three existing GM 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.

Adjusting the Timing
(Figure 2)

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 and gasket using a small
amount of gasket sealer if desired.

© Copyright 2007, Cloyes Gear Company. All rights reserved. 9-3149A 2