Knocking
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New User
Joined: May 2004
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Knocking
I’ve got a ’90 Bronco 5.8L, its got a knock in the bottom of the engine and the rear main seal is leaking. Now I’m wondering if these problems are related. Do you think that the main bearing are worn and need replacing? And if they do, how do I go about sizing the new ones on a stock engine that has never been rebuilt? All help and comments needed.
Postmaster
Joined: Jun 2001
Posts: 4,496
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I doubt they are related but any thing is possible.
You will have to determine the source of the knock and go from there. If its a spun bearing you'll need to check the condition of the crank and determine if machining is required and how much, then you can determine what replacement bearings you need to use. Good luck
You will have to determine the source of the knock and go from there. If its a spun bearing you'll need to check the condition of the crank and determine if machining is required and how much, then you can determine what replacement bearings you need to use. Good luck
Elder User
Joined: Dec 2002
Posts: 713
Likes: 1
From: Houston U.S.
Is it a wrist pin knock? or a connecting rod knock?? Try this, Rev the engine up and if it gets worse, you may have a Piston skirt cracked. If it stops while reved up, sounds like a thrust bearing issue, and that would cuase rear seal problems if that is it. Another mistake many people make is by using a spark plug that has to long of a reach, and that will definitely cause a knock. ....Janet
