Collapsed lifter - dirt in it?
10 Second Club
Joined: Dec 2008
Posts: 330
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Tough call. But its enough to warrant a complete lifter change 'just cause'
Worse case, you got all new lifters. Plus, you'll get a chance to have a look at everything else inside while youre at it.
Worse case, you got all new lifters. Plus, you'll get a chance to have a look at everything else inside while youre at it.
It's just wierd to me how it was fine before the cam and when you restarted it after the cam it ticked. It sounds like a oil pressure thing to me. I know lifters can collapse but that is wierd how it was right after the cam install. Oil pressure is a funny thing it might just be the way the oiling system is that #7 is last in line and it is bleeding off. If it was me I would change the oring and see what happens.
That's exactly the thing. The only other thing I can think of is since they're stiffer springs maybe they're putting more stress on the lifter cup, and maybe it's just worn out.
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Verdad Gallardo Ya like I said The others will be pretty damn tight they might move a little but shouldn't move easy by any means. If it moves that easy it is probably bad. But i would still try the Oring first cause it might just be that simple. As a mechanic that is what I would try here at work.
The reason used lifter seem to fail after a cam change is because on every cam swap stiffer valve springs are used and the lobes of the new cam also puts more of as beating on the lifters. The stock cam has really mild lobes and the stock springs are pretty soft also. So a worn lifer will work ok with the mild parts. Start getting aggressive lobes and stiff springs then the old lifters to to crap out.
not to scare you but i think this was the cause of my LS7 lifter failure only after 5k miles or so
https://ls1tech.com/forums/generatio...pper-pics.html
https://ls1tech.com/forums/generatio...pper-pics.html
Just a by the way on this as I don't know if dirt is the problem. I have had my heads off twice now. I have been very careful with regards to getting dirt down into the oil gallery where the lifters are when the lifters were not in the motor. Both times, as a final check before installing the lifters, I was fortunate enough to borrow a laser powered articulating boroscope from work. Both times I found dirt in the oil gallery and then cleaned it out. You would never see it without the boroscope. Guess what I am trying to say in a round about way is that it would be very easy to get a piece of dirt in there no matter how careful you are when you work.
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Joined: Sep 2005
Posts: 453
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From: 415 Northern CA
The reason used lifter seem to fail after a cam change is because on every cam swap stiffer valve springs are used and the lobes of the new cam also puts more of as beating on the lifters. The stock cam has really mild lobes and the stock springs are pretty soft also. So a worn lifer will work ok with the mild parts. Start getting aggressive lobes and stiff springs then the old lifters to to crap out.
