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Unread 12-18-2012, 06:17 AM   #1
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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Unread 12-18-2012, 07:06 AM   #2
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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Unread 12-18-2012, 07:12 AM   #3
streetzj
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How long have you been driving it with the noisy lifter?
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Unread 12-18-2012, 08:06 AM   #4
AVR2
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Probably well over a year.
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Unread 12-18-2012, 08:30 AM   #5
ratmonkey
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Lifters don't knock. A knock is much different noise than a lifter tick.
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Unread 12-18-2012, 08:44 AM   #6
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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Unread 12-18-2012, 01:02 PM   #7
LunaMoona
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Replace them now and take proper care of your engine.
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Unread 12-18-2012, 04:39 PM   #8
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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Unread 12-19-2012, 05:28 AM   #9
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.
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Unread 12-19-2012, 05:35 AM   #10
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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Unread 12-19-2012, 05:36 AM   #11
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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Unread 12-19-2012, 05:44 AM   #12
AVR2
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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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Unread 12-19-2012, 05:06 PM   #13
coralman
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I just didn't know.
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