what type of hydraulic lifters in the 4.0 - JeepForum.com
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post #1 of 7 Old 11-18-2004, 09:46 AM Thread Starter
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what type of hydraulic lifters in the 4.0

Does anyone know what type of lifters the 4.0 engine have? I know they are hydraulic but are they flat-tappet hydraulic or roller hydraulic?

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post #2 of 7 Old 11-18-2004, 10:24 AM
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If 90% sure they are flat tappet design, hence our noisy valvetrains!

someone plaese confirm....

I sure hope so anyway, If thats a roller cam/lifters in there making all that racket that's pretty awful Both hot rods run roller cams, and the valve train is silky smooth silent on em'.
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post #3 of 7 Old 11-18-2004, 05:36 PM
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Just as Flexy TJ guessed the service manual shows as flat tappets in pictures-doesn,t really say in print but the cost difference is probably a deciding factor.

Large vacuum leak sucking all the dead presidents out of my wallet.
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post #4 of 7 Old 01-23-2017, 04:35 PM
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The 4.0L has flat tappet lifters. I just did my lifter replacement job last month (Dec 2016).

Colorado Chuck
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2001 TJ 2-door Softop 4.0L
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post #5 of 7 Old 01-29-2017, 09:12 PM
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Colorado chuck, did this quiet the engine?
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post #6 of 7 Old 01-30-2017, 09:15 AM
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Flat tappet lifters. While rebuilding my 4.0 last year I noticed a couple of lobes on the cam were going flat. That definantly would cause my ticking.
01 4.0l with 150k

Scott Vosevich
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post #7 of 7 Old 03-04-2020, 05:47 PM
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Sorry for the long delay. Re: quieting the engine, replacing the lifters (I used a stock replacement I bought from NAPA) didn't really change the sound of the engine. The stock lifters tend to create a slight (very quiet and steady) rattle in the engine. I would equate to the sound of a gently agitated can of peanuts shaken by hand. And I will caveat that with I hear most of the engine noise in my stock 4.0L valvetrain is from the timing chain -- you can confirm this with an automotive stethoscope pressed on the timing cover while the engine is running. (Do this VERY CAREFULLY - You don't want to get bitten by the fan!!)

I haven't seen the stethoscopes in NAPA lately; I have seen them on the ((well known nation-wide discount dealer)) for around $10. I find them to be very useful in locating where engine noise is loudest, and that CAN help you locate the general origin of engine noises.

Colorado Chuck
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2001 TJ 2-door Softop 4.0L
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