How to adjust a roller rocker arms? - Ford Mustang Forum
 
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post #1 of 7 (permalink) Old 04-19-2009 Thread Starter
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How to adjust a roller rocker arms?

Hi , I just wondering if anybody can give me a hand and tell me how to adjust the roller rocker arms on my wold windsor jr heads.thanks my car is 89 ford mustang gt
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post #2 of 7 (permalink) Old 04-19-2009
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1. Remove the valve covers, and pick a cylinder you are going to set the pre-load on. Only do one cylinder at a time.

2. Rotate the engine in its normal direction of rotation (clockwise) and watch the exhaust valve on that particular cylinder. When the exhaust valve begins to open, stop and adjust that cylinder's intake rocker arm.

3. To adjust, back off the intake rocker arm adjusting nut and remove any tension from the push rod. Wait a minute or two for that hydraulic lifter to return to a neutral position. The spring inside the lifter will move the push rod seat up against the retaining lock, if you give it time to do so.

4. Twist the intake push rod with your fingers while tightening down the rocker arm. When you feel a slight resistance to the turning of the push rod, you are at "Zero Lash". Turn the adjusting nut down one half to three-quarters of a turn from that point for street applications. Use 1/8 to 1/4 turn for race applications. Lock the adjuster into position. The intake is now adjusted properly.

5. Continue to turn the engine, watching that same intake valve/rocker you just set. It will go to full open and then begin to close. When it is almost closed, stop and adjust the exhaust rocker arm on that particular cylinder. Loosen the exhaust rocker arm and follow the same procedure described before in steps 3 and 4 to adjust this rocker arm.

6. Both valves on this cylinder are now adjusted, and you can move on to your next cylinder and follow the same procedure again.
post #3 of 7 (permalink) Old 04-19-2009
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BTW this is MUCH easier if the spark plugs are out.

Randy
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post #4 of 7 (permalink) Old 04-19-2009
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this is close enough to the question i was going to ask so i guess ill just ask it here. rlg, you said "lock adjuster into position". i only have one nut on top of the rockers. how would i "lock it"? do i need to put another nut on there? im just worried about the adjusting nuts loosening themselves

351w (soon to be)DOOE heads, edelbrock intake and carb, longtube headers...

reviving someone elses trashed project
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post #5 of 7 (permalink) Old 04-19-2009
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Quote:
Originally Posted by PunchRacing View Post
this is close enough to the question i was going to ask so i guess ill just ask it here. rlg, you said "lock adjuster into position". i only have one nut on top of the rockers. how would i "lock it"? do i need to put another nut on there? im just worried about the adjusting nuts loosening themselves

WhAT kind of rocker do you would have ....

or they stud or pedestal mount.....
post #6 of 7 (permalink) Old 04-19-2009
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You must have the self-locking nuts then, instead of the "poly lock" kind that has the allen screw in the middle that locks the nut??

If so, no need to lock them. If they are in good shape they won't back off with normal stresses with a hydraulic cam. With a mechanical lifter cam with lash you might want something more positive. Doing regular self-locking nuts requires wiggling the rocker and looking for slop, and adjusting for very little side slop.

Doing one cylinder at a time wears down my patience too much!

While going through one cylinder at a time works fine, you can also make a list and do three or four valves at a time by doing ALL the opposing valves.

I've done this with all my engines since the 60's.

Tom
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post #7 of 7 (permalink) Old 04-19-2009
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stud mounted. ill get some details tomorrow when i can look at the heads alittle closer

351w (soon to be)DOOE heads, edelbrock intake and carb, longtube headers...

reviving someone elses trashed project
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