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Unread 02-24-2003, 11:30 PM   #1
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Join Date: May 2002
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Blown Engine?

Hi, im a new member here, great site you guys got, lots of useful information. The problem i have is in my 90 cherokee with the 4.0L. The engine is making a horrible clattrering noise. It sounds like the lifters are hitting the inside of the valve cover. It is a constant sound and increases with engine reving. It sounds like i have a diesel engine now. I was thinknig maybe a thrown rod, but i really have no idea. But the thing is, it was in storeage for over a year before i took it back out the other day do to the fact that we got over 2 feet of snow. It was messed up before we put it in storage, but my friend who is a mechanic said that it proably wouldnt have even started if it was that messed up. We put a new battery in and it turned right over, no oil burning or anything. We even used it to pull my other car out of a creek. The car was really stuck and we were gunning and reving the engine really hard for a long time pulling the car out. The thermostat was fine, oil pressure was fine and no oil burning. i even drover it about a half hour down a country road, with no problems. So is it just something simple or can these engine take that hard of a beating with a thrown rod or whatnot? Is there a simple way for me to tell if its a rod or lifter? I will post a video clip tomorrow so you can hear it for yourself. Any suggests are appreciated. Thanks.

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Unread 02-27-2003, 01:38 AM   #2
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The older Xj's 4litres sound that way. There is a lot of lifter noise and piston slap. (In most cases) Run some engine flush through it before the next oil change and maybe a can of Restore through it to quite it down a little. It will still clatter, just a little more muffled.

My 93 made a lot of noise at the lifters, they were filthy. I did the above and it runs pretty smooth, as least as smooth as can be expected for a 100K+ mile XJ.
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Unread 02-28-2003, 02:31 AM   #3
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Most 4.0 engines with alot of miles have noisy lifters. Dont worry about it just use some 20W50 oil in it and it will quiet down. Mine has over 125K miles on it and runs great doesnt use a drop of oil. Pleanty of power. Takes some getting used to.
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Unread 03-01-2003, 08:52 AM   #4
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How is your oil pump holding up with that 20w50???
I have been a little leary to run anything over 10w30 in mine because I have heard that you can wear out an older pump this way very quickly!

I dont have alot of lifter noise but do have a engine w/ many miles and want to do whats best for it
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Unread 03-03-2003, 09:54 AM   #5
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20W 50 is the best oil for the 4.0 (and almost any engine for that matter) over 100k. If you search the forum for topics on this, we have debated this issue to death over the past year or more. I personally use it all the time once an engine reaches 100k. I always get way over 200k out of an engine with no problems. It will not cause any premature wear at all to an oil pump.

I wish I had time to go into this issue more, but I dont, LOL.

Anyway, 20W50 all the way.

As far as the clattering, it could also be collapsed lifters from sitting for the extended period. If they collapsed, it will clatter like hell. Has it gotten any better by running it?

If it were a blown rod or piston, it would likely heat up more than normal due to the friction.
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