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Unread 03-08-2014, 09:34 AM   #1
rubisean
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1990 YJ Wrangler 
 
Join Date: Mar 2012
Location: wesley chapel, fl
Posts: 207
lifter tap

advise on quieting noisy lifter..... 90 4.2

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Unread 03-08-2014, 09:52 AM   #2
Latefreight727
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1991 YJ Wrangler 
 
Join Date: Jul 2013
Location: Arcadia, Fl
Posts: 101
You can try Marvel Mystery Oil. It is a long shot but cheap to try.
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Unread 03-08-2014, 09:57 AM   #3
bigbossd1030
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1995 YJ Wrangler 
 
Join Date: Feb 2010
Location: Edmonton, AB, Alberta
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Quote:
Originally Posted by rubisean
advise on quieting noisy lifter..... 90 4.2
Déjà vu, I'm seeing doubles.
Add a litre of ATF in the engine for a couple hundred clicks.
Then change oil.
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Unread 03-08-2014, 02:43 PM   #4
90DesertTanYJ
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1990 YJ Wrangler 
 
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Location: Jacksonville, FL
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Quote:
Originally Posted by bigbossd1030 View Post
Déjà vu, I'm seeing doubles.
Add a litre of ATF in the engine for a couple hundred clicks.
Then change oil.
This. Get a WIX or Napa Gold filter. AMC has been plagued by oiling issues. If your engine isnt clean it will cause all kind of problems.
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Unread 03-08-2014, 06:24 PM   #5
93YJfalcon
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1993 YJ Wrangler 
 
Join Date: Apr 2005
Location: near St. Louis, mo.
Posts: 1,565
My ticking 4.0 quieted after switching to full synthetic motor oil.
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Unread 03-09-2014, 08:56 AM   #6
sptrmike
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1989 YJ Wrangler 
 
Join Date: Mar 2010
Location: epping, New Hampshire
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I had the same problem. I used Marvel Mystery Oil, but I left it in for 3000 miles the lifter got quiet at about 1600 miles. I had changed pushrods and rockers because they had some wear, more than I thought they would have with just under 90,000. I did this before MMO and noticed a sludge film on every thing under the valve cover. I did my oil change last weekend and pulled the valve cover spotless,I mean it looked brand new! no sludge, all of it gone. I am going to keep using MMO every oil change and I changed from Rotella 10-30 to 15-40 and use Wix filter. My engine is now running like it did when I fist built it, that stuff is great!
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