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Old 03-17-2015, 04:58 PM
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Lifter knock

This one goes out to all those with either the 2.5 or 4.0 whose lifters are making noise or have made racket in the past. I know these engines are known for doing this. my question is how loud or how long should I allow this to carry on before I seriously consider rebuilding the engine. has anyone else experienced this and allowed this to carry on until the engine just eventually gives out or can this run for 300,000 miles? Currently I have a 2.5 with a hundred fifty thousand miles runs fine, starts fine, just makes a lot of noise and very annoying. Just curious many thanks in advance for all questions comments and concerns.

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Old 03-17-2015, 07:33 PM   #2
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2001 4.0L, 210,xxx miles…sounds like a Singer sewing machine. Burns 0 oil, good compression all around and runs like a top.
I wouldn't worry.

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Old 03-17-2015, 08:03 PM   #3
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what exactly is a lot of noise?
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Old 03-17-2015, 08:32 PM
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It's loud enough I can sometimes hear it while in the cab at a stoplight with the windows up. . Mind you im in a soft top but still
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Old 03-18-2015, 09:58 AM   #5
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Quote:
Originally Posted by NJWrangler01 View Post
2001 4.0L, 210,xxx miles…sounds like a Singer sewing machine. Burns 0 oil, good compression all around and runs like a top.
I wouldn't worry.
I wish I had this guys luck...my 01 decided to break a piston skirt at 112,xxx miles.

Mine had a tick for years, but one day on my way home it went to a loud knock. That is why I asked how much noise it is making. A part of me wonders if mine really was a lifter tick or if it was the pistons wearing to begin with. The reason I say this is that I replaced the pistons a few months ago and all my ticking went away. I took everything apart and cleaned everything, but I didn't replace or do anything except for pistons and bearings. For years all I heard was that the 4.0 is bullet proof...then this happened. I talked to an old friend of mine that actually worked at Chrysler in the late 90's and early 2000's and he said the piston skirt issue was something that was being worked on back then and was a known issue. Never really said if it was a piston manufacturer issue or what.

I consider myself lucky...as soon as I heard it knocking I parked it until I could fix it. I had zero damage to the cylinder walls.
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Old 03-18-2015, 10:14 AM   #6
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Old 03-18-2015, 10:15 AM   #7
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That link was wrong will try again

http://www.bobistheoilguy.com/forums...Number=2915802
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Old 03-18-2015, 10:23 AM
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Are the 2.5's prone to the same kind of failure?
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Old 03-18-2015, 12:05 PM   #9
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That link sums it up pretty well in my opinion. I believe the ticking in my engine that started around to 70,xxx mile mark was actually a bit of piston slap. When I took the pistons out, the teflon coating (or whatever it is) is definitely more worn on one side the the other. To the point where a few had no coating left on one side and the other has not worn through at all.

But to answer your question on the 2.5...I do not know. Google Jeep 2.5 piston skirt and see what it comes up with.
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Old 03-18-2015, 02:03 PM
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Sounds good im currently looking to find someone to throw a new motor in for me
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Old 03-18-2015, 03:59 PM   #11
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I replaced the lifters in my 4.0. Took 5 hours and cost me about $125.
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Old 03-19-2015, 01:12 PM   #12
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My engine has had one lifter making noise for over 18 months, worse when cold.

I switched to 20w50 Castrol motor oil, that made it much better, it's still annoying when cold so I keep the RPM's down till it warms up.

My jeep 4.0 5 speed, stock everything, uses no oil, and has over 300,000 miles.
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Old 04-20-2015, 08:51 PM   #13
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`02 with ~66K on it (my midlife-crisis sports car).

You can tell whether it's piston slap or a lifter by the speed at which it happens. If it happens with every revolution of the crankshaft, it's a piston, but if it's half that it's the lifters (since the cam rotates at 1/2 engine speed). So...if it's a piston and you're idling at 600 RPM you'll get 10 taps per second - very distinctive, but if it's the more-likely lifter noise it'll be half that and you can pretty much count them over a few seconds.

If it's the valve lifter there's a huge body of folklore but unless there's something mechanically amiss, it'll be a clogged oil port. I just flushed the daylights out of mine with Seafoam during oil changes and threw in a half can after and got it to go away ... eventually (took about 24 months or so). If it's not affecting engine operation it's just a matter of patience - some people just drive them forever like that. Given the difficulty of replacing the bloody things I was prepared to wait it out.

One day this spring I drove it for about 25 miles on the freeway and when I pulled off...no more noise! It'd finally cleared itself.

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