Cloyes Hex-A-Just 9-3146B User Manual

April 29, 2009

Installation Instructions
9-3146B 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
Cloyes Cam Button (Part Number 9-200 or 9-202) (Optional, but Recommended).

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 bearings 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.

Inserting Offset Bushing

(Figure 1)

5. Install the Camshaft Thrust Bearing. Install the Thrust Needle Bearing on the back side
of the camshaft gear with the black side of the bearing facing gear hub, so the silver
side of the bearing will be facing the block. Failure to install correctly will cause a

severe wear issue!

© Copyright 2007, Cloyes Gear Company. All rights reserved. 9-3146B 1

April 29, 2009

6. 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-A­Just® Bushing in place. Be sure that the timing mark aligns with the crankshaft timing
mark, and that the Thrust Bearing has not slipped off of the shoulder on the sprocket hub.
Bolt it in place using the existing GM bolts or equivalent. Install these bolts slightly loose.

7. Install the Cam Button. Install the cam button (Part Number 9-200 or 9-202) using the
instructions enclosed with it.

8. 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.

9. Torque Loose Bolts. Torque the three (3) Cam

Adjusting the Timing
(Figure 2)

Sprocket mounting bolts to 300 in-lb (25 ft-lb).

10. 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.

11. Install the Timing Cover and Gasket. Install the timing cover gasket using a small
amount of gasket sealer if desired. Install the timing cover using the ten (10) mounting
bolts. Torque these bolts to 160 in-lb (13 ft-lb).

© Copyright 2007, Cloyes Gear Company. All rights reserved. 9-3146B 2