Stuck lifter #7 exh.
On The Tree
Joined: Jan 2016
Posts: 111
Likes: 7
From: Nebraska
Curious, did it have the squeak noise? Like a spun bearing kind of noise? I just did a cam upgrade and put in new lifters. During the dyno the engine lost 50 hp and started to squeak. The mechanic said he thought it was a spun bearing but its not loosing oil pressure at all. He said he would think a bad lifter if I hadnt just replaced then. Thanks
Curious, did it have the squeak noise? Like a spun bearing kind of noise? I just did a cam upgrade and put in new lifters. During the dyno the engine lost 50 hp and started to squeak. The mechanic said he thought it was a spun bearing but its not loosing oil pressure at all. He said he would think a bad lifter if I hadnt just replaced then. Thanks
I known the noise you refer to. Squeaking (usually a main) or a dull thumping sound (usually a rod), but I had tappet noise only. I did not listen to the car, but it sounds like a bearing problem. Sometimes that will occur and still hold good pressure. Good luck.
I finally found time to replace the cam and lifters. As mentioned above Howards replaced the cam and lifters. Although my old springs were OK according to the machinist, I replaced them also just to be certain and since the heads were off. The motor started instantly, and so far I have 150 miles on the new top end. It runs great. But, it did so before with the old cam in the beginning until the tappet failed at about 3000 miles. Time will tell, but I have a feeling that this time is the charm.
For your information, I found no shavings in the filter or elsewhere in the motor except for one spot. I fished out a shaving about an 1/8 inch long from the left lifter gallery with a magnet. I blasted out every gallery with brake cleaner and used three cans. When I flushed out the pan, I carefully checked the drain pan for debris but found none. The shaving was found in the lifter oil gallery between number 1 and 3 cylinders. I bought a magnetic drain plug and will check it when I change the oil and filter at three hundred miles.
Thanks to all who took the time to offer suggestions.
For your information, I found no shavings in the filter or elsewhere in the motor except for one spot. I fished out a shaving about an 1/8 inch long from the left lifter gallery with a magnet. I blasted out every gallery with brake cleaner and used three cans. When I flushed out the pan, I carefully checked the drain pan for debris but found none. The shaving was found in the lifter oil gallery between number 1 and 3 cylinders. I bought a magnetic drain plug and will check it when I change the oil and filter at three hundred miles.
Thanks to all who took the time to offer suggestions.
Teching In
Joined: May 2015
Posts: 36
Likes: 0
Had something similar just happen to my LQ4. I was able to find the broken parts of the lifter in the pan, there was hardly any flakes in the bottom of the filter, I didn't see any in the element, the pan had the majority of the trash. The cam bearings were very clean, the oil galleys were spotless. I may have lucked out.
Had something similar just happen to my LQ4. I was able to find the broken parts of the lifter in the pan, there was hardly any flakes in the bottom of the filter, I didn't see any in the element, the pan had the majority of the trash. The cam bearings were very clean, the oil galleys were spotless. I may have lucked out.
On the second oil change, I stopped in a gas station and when I restarted the motor the pressure fell to 21. I carefully restarted the motor and the pressure retuned to normal. Assuming that the bypass opened, I drove home and changed the oil the next day. I opened the filter and found nothing unusual. On the third oil change, I noticed the pressure needle pulsing at idle. It pulsed for about 100 miles and I decided to change the oil again.
On the fourth change, I switched to my usual oil, Delo 400 15-40. Its holding good pressure but has only about 100 miles on the change. In total I drove about 1500 miles on four changes. The motor is clean and I hope this will be the last change until I hit 3000 miles. The motor runs great, with only the usual sewing machine sound.
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Joined: May 2015
Posts: 36
Likes: 0
Well, got her put back together. Hit the track Sunday and made some eighth mile passes was 7.02 @ 95 Now freshened up it's running 6.93 @ 97 and it was 95 degrees out wit 72% humidity, can't wait for the cooler weather.
That's good news. So, I assume the valve train is OK??
Teching In
Joined: May 2015
Posts: 36
Likes: 0
Yep, I bought a new Texas Speed Cam, LS7 lifters, Upgraded Trunion Rockers, cleaned the heads, put a new oil pump in, checked a few bearings, and changed the oil restrictor. Back in business. Good luck with your ride !!