camshaft issues
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camshaft issues
A few months ago, I had my 91 f150 v8/5.0 302 rebuilt at 200k miles. 2000 miles after the rebuild, I hear noises from low in the engine. I took it back to the shop, and when they pulled the engine, the camshaft had deep scoring marks, but smooth, as if it had been taken to a lathe. The mechanic said I overheated it and put too much stress on it.
I drove mostly highway miles during the break-in, keeping it under 60mph. I towed an 800 lb compressor 100 miles, and a 14' flatbed trailer, empty, another 100.
The engine is under warranty, but the shop is giving me static, saying it's my fault. I saw no discoloration on the shaft.
My idiot oil pressure and temp gauges all registered ok, and I never noticed any overheating issues. This truck has always run on the cool side, even when towing.
Any thoughts?
I drove mostly highway miles during the break-in, keeping it under 60mph. I towed an 800 lb compressor 100 miles, and a 14' flatbed trailer, empty, another 100.
The engine is under warranty, but the shop is giving me static, saying it's my fault. I saw no discoloration on the shaft.
My idiot oil pressure and temp gauges all registered ok, and I never noticed any overheating issues. This truck has always run on the cool side, even when towing.
Any thoughts?
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
You are gonna have to run an oil with zinc or a ZDDP additive all the time with a flat tappet cam these days, all those lubricants have been removed from modern oils. On top of that any cam you buy now is inferior to what was produced 20yrs ago in terms of core hardness and durability, many are failing at breakin or shortly after. I'd keep pushing back against your builder, I don't think you did anything wrong but it's entirely possible your builder did nothing wrong either and you just got another bad cam.
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Thanks, Conanski. I'm not looking to place blame. Things happen. I agree that components today are not like they were years ago. I have not looked at a lot of camshafts, but the scoring I saw was not consistent with overheating or loose metal. I found no particles in the oil. It tells me the crank is not up to par. So far he has replaced the crank, no questions asked. I expect him to try to nickel and dime me, and I'm prepared for that. I will find out tomorrow if any other components are affected. From what I saw, there appears to be no other overheating of anything. Enough heat to deform a crank will certainly show up in other places.
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