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Old 03-02-2012, 03:23 PM   #1
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Top end noise = soft lifter

So I have been working on a 2000 TJ with 4.0l. I rebuilt motor and had timing issues. After posted issue on here she started right up. After a day or 2 of driving she kept throwing codes for misfire in cylinder 2. It would always set at around 2000 rpms and run like crap - no power, sound like a diesel engine. I tried new spark plugs recommended by forum, replaced coil pack and replaced crank sensor. I got frusterated and took to a local repair shop. While they were looking at it a loud noise developed in the head. It was shut down and I towed it home to take head back off. Upon pulling the valve cover I found a lifter on the second cylinder was extremely soft allowing a lot of movement. It is the 4th lifter back from the front. When I rebuilt motor I replaced the lifters with sealed power brand from advanced auto. Could this have been causing the misfire or did this just happen by chance?

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Old 03-03-2012, 01:00 PM   #2
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Took head off today and pulled lifters. 6 of the lifters were eaten up with #2 cylinder - 4th lifter back having a hole in the bottom. Lifters were new upon install - less then 75 miles ago. Prior to rebuild camshaft was gone over by machine shop and they said it was ok. I am guessing camshaft should be replaced now. 4th lifter back is smaller valve, does that make it a intake valve? What would cause them to get eaten up so fast? Any thoughts?

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Old 03-03-2012, 01:39 PM   #3
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Could I have gotten a bad head? The valves don't need adjusted do they? The rockers were torques to spec. Just trying to figure out what caused it. Pushrods were kept with rockers when removed.
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Old 03-03-2012, 01:50 PM   #4
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Just my thoughts, you either didn't use enough assembly lube or some kind of oil problem
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Old 03-03-2012, 02:00 PM   #5
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I thought about that to. When building I used a combination of assembly grease from NAPA and Permatex engine assembly lube. I replaced the oil pump and just cleaned up the pick-up tube. When I pulled the valve cover oil was in the top of the head. My biggest concern is if the head caused this. Regardless now it needs new camshaft and lifters. Just dont want to have problem again. Oil pressure guage ran good when running - I understand its just a dummy though. I am just frusterated with engine!
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Old 03-03-2012, 02:54 PM   #6
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It's been about 20 rears since I dug that far into an engine that far, but maybe one of the ports supplying oil to cam, but still allowing the gauge to show pressure.

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