MS4 Lifter knock SOLVED.. Oil concerns SOLVED.
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From: N Falmouth MA
MS4 Lifter knock SOLVED.. Oil concerns SOLVED.
Some may know, I sat in on a MS4 cam swap(239/242 .649 .602 112lsa), TSP LS6 Stage 1 heads, PRC Dual VS, Hardened PR's, Mezire EWP, ASP UD crank pulley.. This was on my buddy's 02 SOM SLP SS.
We installed everything, got the car running and tuned. BAD valvetrain knock! Yes, a knock. We tried three different lengths of PR's, no help. We ripped everything back apart, replaced the oil pump pickup tube O ring w/ a beefier GM one. Replaced the lifters w/ LS7 Lifters, 7.350 PR's.
Runs great now. The oil pressure used to fluctuate like crazy at idle. It sits FIRM at 60 at idle now. Idle is set to 950rpm. That damn oil pickup tube O ring fixed a lot. I think the stock thinner ring was leaking and causing aeration in the oil.
Uuuugh, this has been exhausting. I'm glad it's running correctly now. We have all the problems fixed and just have to retune the car.
We installed everything, got the car running and tuned. BAD valvetrain knock! Yes, a knock. We tried three different lengths of PR's, no help. We ripped everything back apart, replaced the oil pump pickup tube O ring w/ a beefier GM one. Replaced the lifters w/ LS7 Lifters, 7.350 PR's.
Runs great now. The oil pressure used to fluctuate like crazy at idle. It sits FIRM at 60 at idle now. Idle is set to 950rpm. That damn oil pickup tube O ring fixed a lot. I think the stock thinner ring was leaking and causing aeration in the oil.
Uuuugh, this has been exhausting. I'm glad it's running correctly now. We have all the problems fixed and just have to retune the car.
Last edited by Bayer-Z28; Apr 7, 2007 at 11:10 AM.
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Joined: Jan 2005
Posts: 2,592
From: N Falmouth MA
We still need to nail down a tune for it.. But it sounds like this. -See vid.
http://s96.photobucket.com/albums/l1...t=P1040621.flv
http://www.desertlsx.com/images/jaso...o/P1040639.AVI -Downloadable media.
Sounds the same. We just eliminated the ticking.. I'm trying to load the second vid to my photobucket site.
off a light, he lit the tires up thru third gear...
He's thinking about a new vanity plate: 0traxon .. This town has really crappy roads. NO traction at ALL! Out of town is fine. He's got 315's all around too!
http://s96.photobucket.com/albums/l1...t=P1040621.flv
http://www.desertlsx.com/images/jaso...o/P1040639.AVI -Downloadable media.
Sounds the same. We just eliminated the ticking.. I'm trying to load the second vid to my photobucket site.
off a light, he lit the tires up thru third gear...
He's thinking about a new vanity plate: 0traxon .. This town has really crappy roads. NO traction at ALL! Out of town is fine. He's got 315's all around too!
Last edited by Bayer-Z28; Apr 7, 2007 at 11:09 AM.
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Joined: Jun 2001
Posts: 1,192
From: Hinesville, GA
WHOA, first I heard about this. My Vette also has a similar problem, has a loud valvetrain tick with a cam and low oil pressure but runs fine. It's a '98. Is there a revised oil pump o-ring I could put in it's place?
If the motor is still fine then there would be no real reason to pull it out. That would save a ton.
So the LS7 lifters took care of the noise? No problems with oil getting up top the motor? I heard that factory lifters on some cams can end up starving the valvetrain of oil, so I'm curious...
subscribing.
If the motor is still fine then there would be no real reason to pull it out. That would save a ton.
So the LS7 lifters took care of the noise? No problems with oil getting up top the motor? I heard that factory lifters on some cams can end up starving the valvetrain of oil, so I'm curious...
subscribing.
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Joined: Jan 2005
Posts: 2,592
From: N Falmouth MA
Originally Posted by cals400ex
did they revise that oil pump o-ring? i have been recommended to replace that o-ring in a friends car since the pressure is a bit low.
Thicker oil pump o-ring GM# 12557752
Originally Posted by georgiarocker
Check this out.
During my maggie/cam install, I developed a persistent TICK coming from the vicinity of #7 (rear drivers side) of my LS1. My installer tore my engine apart 2 or 3 times trying to diagnose and pinpoint the problem. After many, many hours and the process of eliminating (& REPLACING) all the "obvious" things... nothing worked.
We were able to calm the tick down a bit but it never went away completely. The tick would develop after putting the car under load on the street for a couple miles, but when you'd stop and let it idle for about 60 seconds, the tick would go away.
Just like you guys, the tick was very loud, sounded like a bad lifter, and was easily discernable from the common "sewing machine" sound... it was very obvious, annoying, and aggravating.
Then... we found this: http://www.pistonslap.com/tsb/020601038.htm
What was happening was: The bad o-ring was allowing air into the oil path and since #7 is the first cylinder to receive oil, it was getting most of the air bubbles and the lifter was not pumping up completely.
I've been hammering on my engine for the last 4 months and NO TICK WHATSOEVER!!!!!!!!!!
Needless to say, my speed shop bought a bunch of O-rings and changes them out every time an LSx engine comes in for performance work!!!
Hope this helps!
During my maggie/cam install, I developed a persistent TICK coming from the vicinity of #7 (rear drivers side) of my LS1. My installer tore my engine apart 2 or 3 times trying to diagnose and pinpoint the problem. After many, many hours and the process of eliminating (& REPLACING) all the "obvious" things... nothing worked.
We were able to calm the tick down a bit but it never went away completely. The tick would develop after putting the car under load on the street for a couple miles, but when you'd stop and let it idle for about 60 seconds, the tick would go away.
Just like you guys, the tick was very loud, sounded like a bad lifter, and was easily discernable from the common "sewing machine" sound... it was very obvious, annoying, and aggravating.
Then... we found this: http://www.pistonslap.com/tsb/020601038.htm
What was happening was: The bad o-ring was allowing air into the oil path and since #7 is the first cylinder to receive oil, it was getting most of the air bubbles and the lifter was not pumping up completely.
I've been hammering on my engine for the last 4 months and NO TICK WHATSOEVER!!!!!!!!!!
Needless to say, my speed shop bought a bunch of O-rings and changes them out every time an LSx engine comes in for performance work!!!
Hope this helps!
THREAD: http://www.ls1tech.com/forums/showth...0&page=1&pp=20
We really aren't sure what exactly solved it. We installed the LS7 lifters and the O ring at the same time.
THe oil pressure consistency is 1000x better now! I think it's due to using a stock O ring in a ported pump.
We also tried to prime the oil system on the first install (month ago), it did not want to prime. AFTER the O ring install, the oil system primed INSTANTLY to 60lbs. We just disconnected the ignition relay under the hood and cranked it over three times for about 10 seconds each time. -Instant oil pressure each time.
Last edited by Bayer-Z28; Apr 10, 2007 at 12:16 AM.
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