pushrod adjust
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Cruiser
Joined: Apr 2007
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pushrod adjust
what is the proper way to adjust pushrods. is it to turn over till piston is TDC on compression stroke, or lift the tubes and watch as you turn over and see the lifters drop to lowest point then adjust. also what year evo had the better lifters? was the 92 lifters a bad year, and should i change them out? just want to get ahead of a problem.
Road Captain
Joined: Apr 2005
Posts: 535
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From: Highspire Pa
As one just learning, I found the instructions from Big Boyz Head porting helpful the few times I adjusted pushrods:
http://www.bigboyzheadporting.com/showthread.php?t=131
***** begin quote*****
To Adjust the Pushrods....
Watch the rear cylinder pushrods or lifters.
Turn the engine over (by hand) until you see the cam overlap for the rear cylinder. That is when exhaust lifter is traveling down and the intake lifter is traveling up (closing the exhaust valve and opening the intake valve).
Once you find that for the rear cylinder, the FRONT cylinder will be on its compression stroke. You can now adjust the front cylinder pushrods.
With the pushrods loose, tighten them until there is no up and down play. The pushrods should be able to rotate easily with your fingers but should not move up and down any.
Using the information above to calculate the pushrod adjustment, adjust both FRONT pushrods that amount and lock them down with the lock nut.
DO NOT SKIP THIS STEP. Wait 15 to 20 minutes for the lifters to bleed down after adjusting the pushrods. If you are on the second cylinder wait 15-20 minutes before starting the engine. You can check to see if the lifters have bled down by turning the pushrods with your fingers. DO NOT turn the engine over until you can rotate the pushrods with your fingers. If they don't bleed down find out what is wrong before trying to turn the engine over.
This completes the adjustment for the front, Now start over again only look for the cam overlap in the FRONT cylinder and adjust the rear.
Hint, if there is no cam overlap then watch for the exhaust valve close followed immediately by the intake valve open.
Another hint, adjust the intake pushrod before installing and adjusting the exhaust pushrod for the given cylinder. It is much harder to adjust the intake pushrod after the exhaust pushrod is in place.
Even more hints, lift the rear wheel and put the tranny in gear then using your hand to turn the tire makes it easy to turn the engine over by hand. Don't forget to take it out of gear before you start it.
******end quote****
I think the 18523-86B lifters are the most recommended and I read some change them as often as every 25 thousand miles.
http://www.bigboyzheadporting.com/showthread.php?t=131
***** begin quote*****
To Adjust the Pushrods....
Watch the rear cylinder pushrods or lifters.
Turn the engine over (by hand) until you see the cam overlap for the rear cylinder. That is when exhaust lifter is traveling down and the intake lifter is traveling up (closing the exhaust valve and opening the intake valve).
Once you find that for the rear cylinder, the FRONT cylinder will be on its compression stroke. You can now adjust the front cylinder pushrods.
With the pushrods loose, tighten them until there is no up and down play. The pushrods should be able to rotate easily with your fingers but should not move up and down any.
Using the information above to calculate the pushrod adjustment, adjust both FRONT pushrods that amount and lock them down with the lock nut.
DO NOT SKIP THIS STEP. Wait 15 to 20 minutes for the lifters to bleed down after adjusting the pushrods. If you are on the second cylinder wait 15-20 minutes before starting the engine. You can check to see if the lifters have bled down by turning the pushrods with your fingers. DO NOT turn the engine over until you can rotate the pushrods with your fingers. If they don't bleed down find out what is wrong before trying to turn the engine over.
This completes the adjustment for the front, Now start over again only look for the cam overlap in the FRONT cylinder and adjust the rear.
Hint, if there is no cam overlap then watch for the exhaust valve close followed immediately by the intake valve open.
Another hint, adjust the intake pushrod before installing and adjusting the exhaust pushrod for the given cylinder. It is much harder to adjust the intake pushrod after the exhaust pushrod is in place.
Even more hints, lift the rear wheel and put the tranny in gear then using your hand to turn the tire makes it easy to turn the engine over by hand. Don't forget to take it out of gear before you start it.
******end quote****
I think the 18523-86B lifters are the most recommended and I read some change them as often as every 25 thousand miles.
Last edited by pajoe; Jun 18, 2009 at 05:03 AM.
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