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LS3 ate a lifter, how big of a dice roll is just replacing cam and lifters?
My c6 ls3 has a lifter that has failed. I hope to get it out tomorrow, but it only moves maybe 1/4" in the bore. I intend to pull the cam and get the lifter out the bottom as it's generally seeming like it would damage things to force it out the normal way. I'd ideally like to just put a cam and lifters (and head gaskets and bolts and so on and so forth) and run the motor until it bucks me.
What are my odds here? If I eventually have to pull motor it will likely be for a crate motor vs a long block, so I don't much care about a good core. The way I see it, I'm risking my efforts (I don't charge much for my time) and whatever I have in parts for a cam, lifters, and parts required to put it back together. Seems worth the gamble to me... But talk me into or out of it.
My c6 ls3 has a lifter that has failed. I hope to get it out tomorrow, but it only moves maybe 1/4" in the bore. I intend to pull the cam and get the lifter out the bottom as it's generally seeming like it would damage things to force it out the normal way. I'd ideally like to just put a cam and lifters (and head gaskets and bolts and so on and so forth) and run the motor until it bucks me.
What are my odds here? If I eventually have to pull motor it will likely be for a crate motor vs a long block, so I don't much care about a good core. The way I see it, I'm risking my efforts (I don't charge much for my time) and whatever I have in parts for a cam, lifters, and parts required to put it back together. Seems worth the gamble to me... But talk me into or out of it.
Thanks!
Were you running an aftermarket camshaft?
If so, what specs?
Stock cam, as far as I know, and hard to say what exactly has happened until I get it out, but roller appears to have stopped rolling or otherwise created friction with cam. I can only see what little I can see through the holes in the valley.
I bought the car in this condition on the assumption that I was buying a motor as well. So I paid accordingly little for the car. Now that I'm tearing into it, the wheels started turning on how good a deal it would be if it was purchase price of broken car + price of cam and lifters. I mean even if it craps out on me sooner rather than later, all the burnouts between now and then are essentially free... Right?
It is probably locked up and has a flat spot as suggested above. You may be able to get away with a cam swap and new lifters.
I suggest cutting open your oil filter. If you see a pole of shavings then you know you need a rebuild. If not, drain the oil, swap the cam and lifters, try not to get too big a case of #WhileImInThere syndrome, and drop the oil pan to make sure it is free of debris
Bought an ls6 with a tap....lifter roller decided to exit the building....decided not to risk it and yanked the motor. Glad I did as there was metal bits EVERYWHERE.
You can't take any chances with these engines.
Mine had to get stripped when a head bolt snapped and parts of it when inside the engine.
Any metal particles and you can have catastrophic failure
You can't take any chances with these engines.
Mine had to get stripped when a head bolt snapped and parts of it when inside the engine.
Any metal particles and you can have catastrophic failure
Agree that any metal is bad, but oil filter didn't seem to be loaded up with metal... Headed back to working on it after lunch. Will hopefully be able to report back this evening with what the lifter looks like and so on.
Yeah, definitely not tossing a cam in and rolling on. More cam lobes are scored and/or pitted than aren't. The bad lifter came out the bottom with no issues, but it's worse than I was hoping.
I’ll go against the grain. If it looks well otherwise, then I would change the cam/lifters, change oil, and swap over to a magnetic drain plug. Change the oil often at first.
It is a stock build, low cost, and had intentions of replacing it anyway. So nearly a free shot to see if that will do it.
Wow, that looks terrible. Been that way awhile, too... tons of wear on that roller - the cam even started running on the roller pocket. Gotta be tons of steel all through that engine. Bummer.
Wow, that looks terrible. Been that way awhile, too... tons of wear on that roller - the cam even started running on the roller pocket. Gotta be tons of steel all through that engine. Bummer.
Yeah, there's more than a little steel floating around in there. I'll get a picture of the cam tomorrow. Ain't pretty.
Now I'm back to deciding between crate motor and a local rebuild.
Yeah, there's more than a little steel floating around in there. I'll get a picture of the cam tomorrow. Ain't pretty.
Now I'm back to deciding between crate motor and a local rebuild.
I'd take it apart, assess damage, and go from there. Bottom end MIGHT be OK, but tear it down and know for sure. If you are any good at a rebuild, WS6store has great deals on rebuild kits and excellent service. Call them when the time comes.
The metal get's everywhere, I would do a complete rebuild and toss the pistons in the trash even if they look ok, Metal can be embedded into the skirts.
Given what you found, if it is my engine, I would get a shortblock from GM and then do the heads and cam I want. Maybe send the heads to GPI and grab a mild cam like 223/235, getvthe compression up, drop in a set of morel lifters, and have a really good street motor that should be very dependable and very fun.
06-07-2019, 08:53 PM
LS3 ate a lifter, how big of a dice roll is just replacing cam and lifters? 
