Questionable cam bearing, opinions needed
07-05-2015, 05:58 PM
#1
Questionable cam bearing, opinions needed Took the stock cam out of my 160k lq4 and they all look pretty rocked. Doing some research kind of leaves me even more confused as to what to do.
Heres number 1. Its the worst. The copper showing on the bottom doesnt bother me as much as the roughness on the top half of the shell.
Seems like the engine sat for a while and maybe corroded the cam to the bearing? Its weird looking
bottom half
top half
Heres number 1. Its the worst. The copper showing on the bottom doesnt bother me as much as the roughness on the top half of the shell.
Seems like the engine sat for a while and maybe corroded the cam to the bearing? Its weird looking
bottom half
top half
07-05-2015, 08:17 PM
#5
Questionable cam bearing, opinions needed
Originally Posted by dburt86
I just see alot of threads with cam bearings in similar condition, and it seems like a 50/50 run it or replace it.
but none of them mentioned anything about the having a rough bearing shell like mine.
but none of them mentioned anything about the having a rough bearing shell like mine.
Never listen to anyone who is stupid enough to run bearings that look any thing like that. Especially when you have the cam out and easy access to the bearings. I've seen threads where people are like yeah no big deal.. There is just a "scratch" or "just a little wear" these people obviously don't know that the cam was/is not designed to touch the actual bearings. It is suppose to be riding on a cushion of oil. If you see wear on any bearings inside of an engine there is something wrong.
07-05-2015, 08:31 PM
#7
GM line hones after the bearings are installed and can cause the copper color to show. I might have thrown myself in front of the firing squad in this one, but I'm just saying. As far as the rough spots, I got nothing for ya on that one. Can you scratch off the rough spots with your fingernail? Maybe it's just from sitting. Still not saying use them or don't. Just a little food for thought.
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07-05-2015, 08:32 PM
#8
Big ? Is do u wanna screw a $400 cam up and possibl take out the bottom end cause of it ? I put a $400 cam in one that the stock cam and bearings looked good and still had bearings weld themselves to cam and took out crank and rod bearings. It's not worth the risk in my opinion.
07-05-2015, 08:36 PM
#9
yea my initial thought was obvisouly to replace them, but who knows. I see alot of guys say that they have gotten crate engines with cam bearings showing copper.
Its probably easiest to take the rotating assembly out to replace them, so now im getting into a whole different set of questions.
Assuming the rod and crank bearings look good, ill re use those.
But should i run a quick ball hone down the bores and re-ring it, or just inspect, clean and reinstall the old stuff?
Its probably easiest to take the rotating assembly out to replace them, so now im getting into a whole different set of questions.
Assuming the rod and crank bearings look good, ill re use those.
But should i run a quick ball hone down the bores and re-ring it, or just inspect, clean and reinstall the old stuff?
07-05-2015, 08:39 PM
#10
Big ? Is do u wanna screw a $400 cam up and possibl take out the bottom end cause of it ? I put a $400 cam in one that the stock cam and bearings looked good and still had bearings weld themselves to cam and took out crank and rod bearings. It's not worth the risk in my opinion.
