Ford v8 Timing Set Installation Instructions Manual

Notes:
* #2120 or #3120 should not be installed on 351W engines as they are designed for 255, 289, 302 or Boss 302 engines.
* If installing part #2120 or 3120 a one-piece fuel pump eccentric (Ford #C3AZ-6287-B) must be used.
* If installing part #2135 or 3135 a two-piece fuel pump eccentric must be used.
* Uses a link belt type timing chain, not a double roller.

Thrust Bearings
Part # Description
3108 TB Ford 390-428 thrust plate and bearings
3120 TB Ford 289-351W thrust plate and bearings. Direct
replacement for OEM cam plate single bearing.
3135 TB Ford 289-351W HP thrust plate and bearings.
Machining and tooling required
3122 TB* Ford 351C, 429-460 thrust plate and bearings
Part #179
Revised 6/27/05
The following instructions begin after the timing cover and old timing set have been removed.
Installation Instructions
1. Clean everything! Make sure that the engine mounting surfaces and your new timing set have been
thoroughly cleaned with a good solvent.
2. If you are using a timing set with three keyways, select the appropriate keyway for your camshaft
timing specifications. COMP Cams ® recommends the standard timing position for most applications.
This position uses the round or “O” timing and keyway marks. Standard Timing Location: This is the
same as original O.E.M. setting. Use keyway and crankshaft gear tooth marked “O”.
???? 4 Degree Advance: Use keyway and crankshaft tooth marked . Note: The or advanced
position should not be used without degreeing the camshaft. Many camshafts have the proper
advance built in. Advancing the cam will reduce intake valve to piston clearance and increase
exhaust piston to valve clearance.
???? 4 Degree Retard: Use keyway and crankshaft gear tooth marked . Note: The or
retarded position should not be used without degreeing the camshaft. Many cams have the
proper advance built in. Retarding the cam will reduce exhaust valve to piston clearance and
increase intake piston to valve clearance.
3. Install your lower timing gear on the crankshaft making sure that the timing marks are facing out
toward you.
4. Now that the lower timing gear has been installed check the timing mark alignment in your engine
manual. Rotate the crankshaft using your crankshaft socket until the timing mark on the gear is in
the proper position (12 o’clock). For 240-300 6 cyl. see Note 1 before proceeding!
5. If your engine is equipped with a camshaft retaining plate or thrust plate, it should be installed at this
time. Note that many Ford thrust plates are marked “back – bottom”. Before final installation check to
make sure that the thrust plate is fitted correctly. 351W owners see Note 2 before proceeding!
6. Temporarily install your camshaft timing gear and rotate the camshaft until the timing mark on the
camshaft gear is in the proper position per your engine manual instructions (6 o’clock).
Tools and supplies needed:
1. Basic hand tools as required for your particular camshaft and
balancer bolts
2. Torque wrench
3. Pro Cam Lube (part #153 or #154) or suitable replacement
4. Camshaft Degree Kit (part #4796 including degree video)
5. Crankshaft Socket (part #4798 for Ford 302-351W, 429-460)
6. Thread locking compound
7. Engine repair manual for your particular engine
7. Remove the camshaft timing gear and loop the chain over the camshaft gear. Lift the camshaft gear
into place on the camshaft. Install the fuel pump eccentric and camshaft bolt or bolts (finger tight for
now). 289, 302 & 351W owners see note 3 before proceeding.
8. Check your manual again for the proper timing mark positions and make sure that both camshaft
timing mark (6 o’clock) and crankshaft timing mark (12 o’clock) are correct. If this procedure is
missed by even one tooth, engine damage can result.
9. For a more accurate installation we recommend that you degree your cam at this time using the
instructions and video provided with your COMP Cams ® Degree Kit, Part #4796.
10. To ensure that you have the right clearances and combination of parts you must check the camshaft
end play. To check camshaft end play, the cam first must be moved completely to the front of the
engine, against the back of its retaining plate. Do so by pulling the cam gear forward gently until it
stops against the plate. Use a feeler gauge to check the clearance between the front of the camshaft
retaining plate and the back of the timing gear. The proper clearance should be between .004” and
.008”. End play can also be checked with a dial indicator on the front of the cam gear while the cam is
moved backwards and forwards completely in the engine.
11. Refer to your repair manual again for proper torque specifications and torque your camshaft bolt
or bolts. Caution: If camshaft bolts loosen up, severe engine damage can result. A good thread
locking compound should be used on all bolts.
12. Check to be sure that the back side of the chain does not touch the front face of the block any
where along the entire length of the chain. Grind the block to obtain clearance if necessary. Do not
modify the chain.
13. Make sure that the engine oil has a clear path to the timing set through the lifter valley drain holes
or some other means. Timing sets require plenty of oil to survive. When increasing timing chain speed
(RPM), lubrication must also increase.
14. Before installing the timing cover and gasket, pour plenty of pro cam lube (part #153 or 154) or oil
over the timing set. The proper lube will protect your timing set during final assembly and start up.
15. Install your timing cover, harmonic balancer and torque your balancer bolt.

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