Loud knock after head rebuild

420nitro · 03-10-2004, 07:33 PM

Sounds like you might have a collapsed lifter. After readjusting your valve train, prime the motor so the lifters pump up. If you can't get one or more lifters to pump up they are most likely no good. I have had this happen to me a couple of times. (It sounds like someone took a ball peen hammer and they're hitting the side of the block...right?)
If I remember correctley I believe Ford even said to leave it alone for about 15 min. and see if it will pump up. (I personally said the ****** with that and just replaced the lifters.)
In case you you don't know how to check for a collapsed lifter all you have to do is pull up on the Roller Rocker by the roller (which sits over the valve stem.) And see if the push rod will go down into the lifter. It will push the lifter down no matter if the valve is STARTING to open or close, so just pull up on all the rockers. If they don't move then your lifters are cool. Don't forget to do a compression check because you can very easily leave a valve stuck open with a bad lifter when adjusting them
Good Luck.

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03-10-2004, 07:33 PM	#2
420nitro Registered Member Join Date: Nov 2003 Location: Rockford Posts: 596	Sounds like you might have a collapsed lifter. After readjusting your valve train, prime the motor so the lifters pump up. If you can't get one or more lifters to pump up they are most likely no good. I have had this happen to me a couple of times. (It sounds like someone took a ball peen hammer and they're hitting the side of the block...right?) If I remember correctley I believe Ford even said to leave it alone for about 15 min. and see if it will pump up. (I personally said the ****** with that and just replaced the lifters.) In case you you don't know how to check for a collapsed lifter all you have to do is pull up on the Roller Rocker by the roller (which sits over the valve stem.) And see if the push rod will go down into the lifter. It will push the lifter down no matter if the valve is STARTING to open or close, so just pull up on all the rockers. If they don't move then your lifters are cool. Don't forget to do a compression check because you can very easily leave a valve stuck open with a bad lifter when adjusting them Good Luck.