Knock, Knock
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Joined: May 2003
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Knock, Knock
Hello, guys! Newbie here!
I have a 1988 F-250 4x4 with a 460. I just started hearing a knocking in the motor. I had a local garage put it up on a hoist and listen and the mechanic said the knock was coming from the oil pan and was probably a rod and the engine should be rebuilt/replaced. Maybe a dumb question, but could a crank/rod/piston (whatever is causing the knock) be replaced by dropping the pan without removing the motor? I know it wouldn't be an ideal fix, but its an older work truck and probably not worth as much as a new motor!
Also, I have run across a couple of used or rebuilt 460s that are mid 70's motors. If I replace this engine completely with an older carburated model, what do I do with the computer? Can it simply be disconnected and the truck still run properly?
Thanks for any info!
I have a 1988 F-250 4x4 with a 460. I just started hearing a knocking in the motor. I had a local garage put it up on a hoist and listen and the mechanic said the knock was coming from the oil pan and was probably a rod and the engine should be rebuilt/replaced. Maybe a dumb question, but could a crank/rod/piston (whatever is causing the knock) be replaced by dropping the pan without removing the motor? I know it wouldn't be an ideal fix, but its an older work truck and probably not worth as much as a new motor!
Also, I have run across a couple of used or rebuilt 460s that are mid 70's motors. If I replace this engine completely with an older carburated model, what do I do with the computer? Can it simply be disconnected and the truck still run properly?
Thanks for any info!
Posting Guru
Joined: Mar 2003
Posts: 1,349
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From: Cloud USA
Knock, Knock
put a real oil pressure gauge on the motor. If a main bearing or rod bearing is out it would have pretty low pressure. If it is a wrist pin oil pressure wouldnt be affected. you can roll in new bearings by removing the pan but chances are you might do more harm than good. Do you know for sure the knock is at crank speed? you can check this with a timing light. If it is at cam speed it would only happen everyother rev. I have a bad lifter in my 460 that needs attention, maybe this winter i will get around to it.
Posting Guru
Joined: Feb 2002
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From: Cleveland, WI USA
Knock, Knock
Originally posted by c_rossman
you can roll in new bearings by removing the pan but chances are you might do more harm than good.
you can roll in new bearings by removing the pan but chances are you might do more harm than good.
I just picked up a set of mic's to measure the journals to make sure they're still within tollerance. If they are, and just the bearings are worn, what kind of "harm" could I cause by changing bearings?
TIA.
Kevin K.
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Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
Knock, Knock
As long as the crank is within specs, it is ok to replace the bearings. Ususally though, by time it's a knockin, there is at least some minor crank damage that will require turning the crank.
Jimmy
Jimmy
