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Old 03-12-2008, 05:44 PM
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chewed cam bearings?

I bought a 355 not to long ago and am going through the hole thing except for the bottom end, and when I pulled the cam it was flat and the front cam bearings were chewed up, I really want to know if that could be caused by just the oil pump, I want to know if I need to replace it or not??
any ideas thanks

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Old 03-12-2008, 06:21 PM
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As a Moderator, I am moving this to the Engine forum ... from the Suspension-Brakes-Steering forum where it was originally posted

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Old 03-12-2008, 06:24 PM
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With flat lobes and trashed cam bearings, i'll lay good money that the crank is shot, along with the main and rod bearings, pistons and cylinder walls. The oil pump is the least of your worries. It needs to be pulled completely down and inspected and professionally cleaned and most likely, a LOT OF NEW PARTS!! When a cam goes south, the rest of the engine goes along with it.

Mark
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Old 03-12-2008, 06:40 PM
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daam, thats not what I wanted to here,
and yea thats why I wanted to know if if was just the pump cause then I would be having MANY other problems.

and so the guy I bought it from isn't the builder but he said it had valve tran problems and a lifter was stuck and then he changed some of the valve tran like 2 times.
so ether he's an idiot (bad mechanic) or I need a rebuild.

I had the heads off though and the walls were fine
and I think the lobes were just worm because of how old the cam is, it wasn't to flat
???????
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Old 03-12-2008, 06:42 PM
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Quote:
Originally Posted by ImRoyaltyInMyChevy
I bought a 355 not to long ago and am going through the hole thing except for the bottom end, and when I pulled the cam it was flat and the front cam bearings were chewed up, I really want to know if that could be caused by just the oil pump, I want to know if I need to replace it or not??
any ideas thanks
I agree with JMARK. The failure probably started with the lobes and lifters, a fairly common SBC problem, the junk circulated with the oil and carved up everything the oil took it to.

Bogie
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Old 03-12-2008, 06:43 PM
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o and for the cam bearings, it is only liek the front two and the front one was chipped away in a horizontal line, not with the ratation....
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Old 03-12-2008, 07:27 PM
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Time for a complete re-build.
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Old 03-12-2008, 07:56 PM
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I'd be tearing that one down.
You're lucky SBC's are about the cheapest most straight forward engine to freshen up with new rings and bearings (including cam bearings) and a crank regrind and a new oil pump.
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Old 03-12-2008, 08:19 PM
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so is the only way cam bears can get messed up like that is by lack of oil?

sorry but I really want to find out, because right now a rebuild is NOT an option, and its going in after I get the rest of the parts, so I guess my next rebuild for it is going to be alot sooner then I planned on.
so now I want to know how bad it can get if i drive it for another year (or 2 or 3), I'm hoping not enough to need alot drilled out of my mains
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Old 03-12-2008, 08:43 PM
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How long? 30 minutes to 30 days

It's like this, the more you run it in this condition, the more you screw up, and the more money it's gonna cost later, and it's also gonna destroy all those new parts, but thats your call!



Quote:
Originally Posted by ImRoyaltyInMyChevy
so is the only way cam bears can get messed up like that is by lack of oil?

sorry but I really want to find out, because right now a rebuild is NOT an option, and its going in after I get the rest of the parts, so I guess my next rebuild for it is going to be alot sooner then I planned on.
so now I want to know how bad it can get if i drive it for another year (or 2 or 3), I'm hoping not enough to need alot drilled out of my mains
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Old 03-12-2008, 08:48 PM
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when you say "in this condition" did you mean the way I said it was, cause when it goes in it's going to have new cam and lifters, cam bearings, and oil pump.
what about that?
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Old 03-12-2008, 08:52 PM
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Make sure when you buy new cam bearings you don't go with stock replacement as you need the performance cam bearings if your using stronger springs and a bigger cam,
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Old 03-13-2008, 05:46 AM
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Quote:
and so the guy I bought it from isn't the builder but he said it had valve tran problems and a lifter was stuck and then he changed some of the valve tran like 2 times.
so ether he's an idiot (bad mechanic) or I need a rebuild.
when you say "in this condition" did you mean the way I said it was, cause when it goes in it's going to have new cam and lifters, cam bearings, and oil pump.
Ayuh,..... I Don't get it,....

You're calling the previous owner an Idiot,....
And,....
Now you want to 1/2assed put it back together the Same Way as the previous owner,..??....

That motor has had Piles of Ground Metal Pumped thru it,.....
The lower end probably Already has plenty of Damage that needs rebuilding,...
It's doubtful that the Oil Pump is the Problem,....
It's all the Crap flowing in the Oil,... The Rods,+ Mains probably look as Bad as the Cam Bearings....

The Odds are,.... You'll be doing it Right, Way Sooner than you Want to,..
Or,.. Just Junking it, after it Pukes,.. Again,.....
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Old 03-13-2008, 09:57 AM
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Yes, you got damage inside that thing that needs to be addressed.

How you going to install cam bearings without tearing engine down? I gotta hear this!



Quote:
Originally Posted by ImRoyaltyInMyChevy
when you say "in this condition" did you mean the way I said it was, cause when it goes in it's going to have new cam and lifters, cam bearings, and oil pump.
what about that?
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Old 03-13-2008, 12:09 PM
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OK I've lost a cam in Chevy engines a time or two and did NOT loose the whole engine! "IF" the only the front cam bearing was bad and not the rest I'd look at a bad installation! This could be the cause of the lost of the cam too! And if the oil pump picked up any debris, remember that oil passes thru the oil filter, so I'd guess the majority of the shrapnel was stopped there. Now I'm not saying NO debris got thru, you might have some scratches somewhere, but not a total engine lost. All you need to do is check of the condition/tolerances of the bearings/engine components and definitely get a new "hardened" cam. My $0.02 anyway, Good Luck!
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