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post #1 of (permalink) Old 07-04-2001, 09:45 AM Thread Starter
 
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Fixed noisy lifter during head change

Nothing radical here. Just a rebuilt motor (4.2L) that ticked on one valve since day one. Drove it like that for nearly 3 years. Changed pushrod, rocker arms, tried shims, etc. Nothing worked. Finally decided to freshen up the head and when I had the old one off I put in a single new lifter. Voila! Nearly silent engine. Definately no tick. Now it's time to see Midas about that lifetime warrranty on my muffer. It rattles just off idle.

By the way, my motor will actually idle smoothly at 400 RPM with the Motorcraft carb. Musta had some slight intake leak cause after I changed the gaskets it idles even slower.

Can't wait to get the 4.56 gears in. Axle has been in the shop for over 2 weeks. Time to give them a call. Summers here, and that my time to crank the wrenches in the driveway and fix all that ails my favourite vehicle.

Tim

84 CJ7, 258, HEI, M/C 2100 carb, 5 inch lift, RS9000's, 33x12.5 BFG M/T's, Lockright, full cage & belts, Xenon flares, AMC 20 1pc axles, GM dual diaphragm brake booster
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post #2 of (permalink) Old 07-04-2001, 09:46 PM
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Re: Fixed noisy lifter during head change

Just curious, but why did you only change one lifter? If it were me I would of done them all since I'd already be at that point. If it were a money issue, I guess I can understand. But I would of waited a little longer to get enough for a set of lifters.

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post #3 of (permalink) Old 07-04-2001, 10:33 PM
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Re: Fixed noisy lifter during head change

I have a collapsed lifter on #6 right now that makes one heck of a tapping sound. How did you fish the lifter out after you took the head off? I was debating on just pulling the head off with the engine still in the vehicle, but was wondering how you pull the lifters out. Thanks...

David
Missouri

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post #4 of (permalink) Old 07-04-2001, 11:49 PM
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Re: Fixed noisy lifter during head change

You should be able to pull it out with a magnet type puller or you can get a lifter puller at most autoparts stores.. Either one should be able to get it out.

Dirtybird
89 YJ 4.2, 4.0 HO Head with MPI, AX15, Procomp 4" Lift, MSD6a, and just gerttin started......
post #5 of (permalink) Old 07-05-2001, 05:10 AM
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Re: Fixed noisy lifter during head change

How exactly can you tell if you've got a bad lifter? My engine makes lots of ticking, but I seem to of established that it's the fuel injectors. Atleast that's what I tell myself to make myself feel better. I pulled the valve cover a while ago and put my hand on each rocker as the engine was running and the ticking didn't go away. Any ideas?

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post #6 of (permalink) Old 07-05-2001, 09:39 AM Thread Starter
 
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Re: Fixed noisy lifter during head change

I figure out which lifter was bad by pressing the wooden handle of a rubber mallet hard against the rocker arm while it idled. I could tell it was near the back, but wasn't sure till I did that. You can really tell which lifter once you press down on the pushrod end of the rocker arm while it's ticking.

Why change only one lifter? The engine was rebuilt 3 years ago and that lifter ticked from day one onward. I've seen so many jeeps with noisy valvetrains that I wonder if there is a lot of low grade lifters out there. I felt that if I replaced all 12 lifters I was increasing my chance of having the problem on another cylinder. I'd gladly have spend 60 bucks on a set of 12 if I had total confidence in them. So I just bought one new lifter and changed the one that was noisy, and it cured the problem. I can barely tell the motor is running at a stoplight.

Yes, I changed the lifter with the engine in the jeep. I unbolted the intake and exhaust and moved them away from the head. Cleaned off old gasket material from manifolds then unbolted the head. Replaced it with a head from my spare motor after having the head rebuilt. Ran into fun with surprise 1/2" head bolts and 7/16" holes in the head from the 84.

The lifters lifted right out. I just stuck a dental pick like tool down the hole in the centre and it slid out without any sticking. Simply dropped the new one in by hand. A couple of fingers barely fit down the pushrod holes more than a couple of inches, but it went find. Lifter had no where else to go but in.

Tim

84 CJ7, 258, HEI, M/C 2100 carb, 5 inch lift, RS9000's, 33x12.5 BFG M/T's, Lockright, full cage & belts, Xenon flares, AMC 20 1pc axles, GM dual diaphragm brake booster
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