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#2225352 - 04/07/11 07:03 PM lifter noise on 2001 Jeep GC 4.0 engine
Donald Offline


Registered: 03/21/04
Posts: 16758
Loc: Upstate NY
Engine has about 95K on it and I have used PP for several changes now, usually at 8K. The lifter tapping/ticking noise is most noticeable at startup but if one gets out to get the mail its noticeable with the engine warmed up.

Solutions:
1) Flush with Amsoil flush, continue with PP and 8K changes
2) Cut the interval down to 5K
3) Do an Auto-Rx cleaning and then go back to PP and 8K changes

Other ideas, besides turning up radio louder?
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#2225409 - 04/07/11 07:37 PM Re: lifter noise on 2001 Jeep GC 4.0 engine [Re: Donald]
MetalSlug Offline


Registered: 07/24/10
Posts: 2393
Loc: vicksburg ms
Before U do any above, with I think dont really nessary. Wat oil filter do u you ? some time your injector making the ticking noise, same as lifter ticking noise.
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#2225845 - 04/08/11 08:14 AM Re: lifter noise on 2001 Jeep GC 4.0 engine [Re: MetalSlug]
Donald Offline


Registered: 03/21/04
Posts: 16758
Loc: Upstate NY
Originally Posted By: CamaroT56
Before U do any above, with I think dont really nessary. Wat oil filter do u you ? some time your injector making the ticking noise, same as lifter ticking noise.


The filter is an Amsoil Ea42.
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#2225886 - 04/08/11 09:10 AM Re: lifter noise on 2001 Jeep GC 4.0 engine [Re: Donald]
MetalSlug Offline


Registered: 07/24/10
Posts: 2393
Loc: vicksburg ms
Give GC 0w30 a try with any quality filter, pure 1, mobil 1, wix.... that GC 0w30 is known for quiet down tapping sound LS1 engine make. Mabe it work on you too. I dont beleive in engine flush or auto rx, as long you use good quality oil and filter, you good to go, but try that GC oil out first.
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#2225944 - 04/08/11 10:19 AM Re: lifter noise on 2001 Jeep GC 4.0 engine [Re: Donald]
D189379 Offline


Registered: 09/01/04
Posts: 1283
Loc: Canada City, Canada
It might be cracked exhaust manifold. It sounds exactly like lifters ticking and gets louder when you step on it. It's an issue with 4.0 motors. I'd hate to see you waste time and money dumping and switching oil brands and grades.

Either way, it's nothing you really need to worry about. Just turn up the radio.

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#2225966 - 04/08/11 10:39 AM Re: lifter noise on 2001 Jeep GC 4.0 engine [Re: Donald]
Donald Offline


Registered: 03/21/04
Posts: 16758
Loc: Upstate NY
So lifter, injector or exhaust manifold, nothing to worry about? I do need to change the oil as long as it stays warm. I have some Amsoil flush that I may just use anyway. Its old stash.
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#2226252 - 04/08/11 02:50 PM Re: lifter noise on 2001 Jeep GC 4.0 engine [Re: Donald]
meep Offline


Registered: 02/20/07
Posts: 2920
Loc: Southeast
may seem odd, but try adding a few oz of a syn 5-20 to the crank case. a cup or so.

In my 93 4.0, i tried, HM oils, Rotella, Rotella T, all made noise. Thing was, if I added just small amount of syn 5-20, it cut the noise in half.

Oil flushes, seafoam treatments, scraping the 1/2 of sludge out of the valve area, made no difference. But the syn 5-20 did, every time.

M
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#2229036 - 04/11/11 12:34 PM Re: lifter noise on 2001 Jeep GC 4.0 engine [Re: meep]
jeepman3071 Offline


Registered: 04/15/10
Posts: 2270
Loc: Storrs, Connecticut
Originally Posted By: meep
may seem odd, but try adding a few oz of a syn 5-20 to the crank case. a cup or so.

In my 93 4.0, i tried, HM oils, Rotella, Rotella T, all made noise. Thing was, if I added just small amount of syn 5-20, it cut the noise in half.

Oil flushes, seafoam treatments, scraping the 1/2 of sludge out of the valve area, made no difference. But the syn 5-20 did, every time.

M



You might be on to something here. A lot of people suggest using 40 weight oils in the 4.0L. In my 2000 the valvetrain seems kinda loud a certain RPMs. Not on startup but I do get ticking most of the time. Seems when I use Marvel Mystery Oil the ticking gets quieter. What weight oil did you mix the 5w20 with?
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#2230905 - 04/13/11 08:58 AM engine noise on 2001 Jeep GC 4.0 - update [Re: jeepman3071]
Donald Offline


Registered: 03/21/04
Posts: 16758
Loc: Upstate NY
Two different mechanics said it was in the lower part of the engine, as in a piston skirt or wrist pin. Yikes. The engine is suppose to be bullet proof.


Edited by Donald (04/13/11 08:58 AM)
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#2230911 - 04/13/11 09:01 AM Re: engine noise on 2001 Jeep GC 4.0 - update [Re: Donald]
mattd Offline


Registered: 10/03/10
Posts: 648
Loc: RI
can you post a video of the noise?
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#2230917 - 04/13/11 09:10 AM Re: engine noise on 2001 Jeep GC 4.0 - update [Re: Donald]
Virtuoso Offline


Registered: 02/25/03
Posts: 2684
Loc: Cow town, NE
I believe we've had a few threads on the 4.0's over the years making a little noise here and there but running for gobs of miles..

..or was that the 2.5? hehe I can't remember.

Does it do it at all RPMs?

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#2230928 - 04/13/11 09:18 AM Re: engine noise on 2001 Jeep GC 4.0 - update [Re: mattd]
Donald Offline


Registered: 03/21/04
Posts: 16758
Loc: Upstate NY
Originally Posted By: mattd
can you post a video of the noise?


I can try.
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2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2001 Jeep Grand Cherokee Laredo 4.0- 4-sale
1999 Dodge Ram 2500 w/Cummins- 4-sale


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#2233855 - 04/16/11 08:19 AM Re: engine noise on 2001 Jeep GC 4.0 - update [Re: Virtuoso]
Donald Offline


Registered: 03/21/04
Posts: 16758
Loc: Upstate NY
Originally Posted By: Virtuoso
I believe we've had a few threads on the 4.0's over the years making a little noise here and there but running for gobs of miles..

..or was that the 2.5? hehe I can't remember.

Does it do it at all RPMs?


The noise is louder when under load. Almost quiet when under a light load. Very noticeable when you get out to get the mail and walk around front of Jeep.


Edited by Donald (04/16/11 08:20 AM)
_________________________
2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2001 Jeep Grand Cherokee Laredo 4.0- 4-sale
1999 Dodge Ram 2500 w/Cummins- 4-sale


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#2233857 - 04/16/11 08:21 AM Re: engine noise on 2001 Jeep GC 4.0 - update [Re: Donald]
Slick17601 Offline


Registered: 12/04/04
Posts: 1304
Loc: Pennsylvania
It could also be piston slap or the wrist pin noise.

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#2234088 - 04/16/11 01:33 PM Re: engine noise on 2001 Jeep GC 4.0 - update [Re: Donald]
Donald Offline


Registered: 03/21/04
Posts: 16758
Loc: Upstate NY
I brought the Jeep today to a place that rebuilds engines. The owner came out to look at it (or actually hear). He felt something in the valve train was going bad, like a rocker arm or a valve had "tuliped". He felt the ticking noise was at a slower speed (like that of the cam) than the speed of the crankshaft.
_________________________
2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2001 Jeep Grand Cherokee Laredo 4.0- 4-sale
1999 Dodge Ram 2500 w/Cummins- 4-sale


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