How long before i need to fix knocking lifter? - JeepForum.com
 
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post #1 of 13 Old 12-18-2012, 05:17 AM Thread Starter
streetzj
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How long before i need to fix knocking lifter?

I have a lifter or tappet or whatever ticking/knocking -- how long can I drive on it before fixing it?

I think this is a common problem with the 4.0? How difficult is it to fix?

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post #2 of 13 Old 12-18-2012, 06:06 AM
AVR2
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I need to do this too. AFAIK it's a relatively straightforward fix, just time-consuming. Pull the head, remove old lifters (a special lifter removal tool is supposed to make this a LOT easier), install new ones, replace head.

I replaced my manifold gasket earlier this year so stripping down that side of the engine holds no mysteries for me any more, but it's just a bunch of work I don't want to have to re-do any time soon, which is one of the reasons I'm putting off replacing the lifters...
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post #3 of 13 Old 12-18-2012, 06:12 AM Thread Starter
streetzj
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How long have you been driving it with the noisy lifter?
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post #4 of 13 Old 12-18-2012, 07:06 AM
AVR2
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Probably well over a year.
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post #5 of 13 Old 12-18-2012, 07:30 AM
ratmonkey
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Lifters don't knock. A knock is much different noise than a lifter tick.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #6 of 13 Old 12-18-2012, 07:44 AM Thread Starter
streetzj
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It is a tick and not a knock. I listened to it more closely and realized that.
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post #7 of 13 Old 12-18-2012, 12:02 PM
LunaMoona
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Replace them now and take proper care of your engine.
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post #8 of 13 Old 12-18-2012, 03:39 PM
Foundrydude
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Depends on how bad it's ticking and how high you rev it. Might last 5 years, might last 5 months.

Typically with ticky lifters you can drive them gently til the engine dies from other problems. But if you do stuff like get stuck in mudholes, then start WOT runs at 230 on the temp gauge, the tick is going to turn into more serious things like bent pushrods & valves.
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post #9 of 13 Old 12-19-2012, 04:28 AM
coralman
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Engine rebuilding is a gray area to me so don't laugh . How would it make sense to put lifters on a worn camshaft, cam bearings, and most likely gears and chain? Mine needs this I think but I need a stethescope and probaly pulling the valve cover before I'm sure.

Just seems like new stuff on top of worn stuff might be counterproductive.

Info on projects and repairs categorized by system
http://www.jeepforum.com/forum/f13/c...-faqs-2863665/

Originally Posted by HighLonesome
lol...if life is as a simple as a 5.9 making you happy, I'd say go ahead and buy it on impulse. ZJs are the way of Zen. Wax on, wax off
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post #10 of 13 Old 12-19-2012, 04:35 AM
AVR2
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I've seen it said on this very forum that as long as you have decent oil pressure, new lifters on an old camshaft are fine.
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post #11 of 13 Old 12-19-2012, 04:36 AM
Foundrydude
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Quote:
Originally Posted by coralman View Post
Just seems like new stuff on top of worn stuff might be counterproductive.
It might be counterproductive but it's also $1800 less than a full rebuild, and buys a couple years of engine life
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post #12 of 13 Old 12-19-2012, 04:44 AM
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Quote:
Originally Posted by Foundrydude View Post
It might be counterproductive but it's also $1800 less than a full rebuild, and buys a couple years of engine life
This
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post #13 of 13 Old 12-19-2012, 04:06 PM
coralman
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I just didn't know.

Info on projects and repairs categorized by system
http://www.jeepforum.com/forum/f13/c...-faqs-2863665/

Originally Posted by HighLonesome
lol...if life is as a simple as a 5.9 making you happy, I'd say go ahead and buy it on impulse. ZJs are the way of Zen. Wax on, wax off
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