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Unread 04-08-2009, 04:46 PM   #1
depebush
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'00 Jeep Grand Cherokee Engine Knocking after changing oil

I have a 2000 Grand Cherokee and i had gone probably 9000 miles between oil changes and now I changed the oil and its knocking, I think its a top knocking, there is not water on the oil, or metal shavings in the oil either but not sure if it may be a lifter or a rod?



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Unread 04-08-2009, 04:52 PM   #2
walter_da_jpr
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Let me guess is it a 4.0?

Do you have the proper amount of oil in it? If everything seems ok, and it is just making a slight knocking don't worry its a common symptom of wear in a 4.0 - The lifters tick.

if it goes away at revs above idle then I wouldn't worry too much. Its not catastrophic, just keep changing the oil.
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Unread 04-08-2009, 04:55 PM   #3
dougy147
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Ticking.....4.0......bring on the Lucas oil stabilizer!
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Unread 04-08-2009, 04:57 PM   #4
depebush
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i put 5 quarts of oil, it started as a ticking but now its a knocking and wont go away while the car is in motion it goes along with the RPM's but the oil pressure is normal
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Unread 04-08-2009, 04:59 PM   #5
depebush
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there is no power loss though
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Unread 04-08-2009, 05:04 PM   #6
the88thpianoman
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4.0 takes six quarts of oil.
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Unread 04-08-2009, 05:06 PM   #7
98zjdave
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Quote:
Originally Posted by depebush View Post
i put 5 quarts of oil, it started as a ticking but now its a knocking and wont go away while the car is in motion it goes along with the RPM's but the oil pressure is normal
Do you have a 4.0L? I know my 4.0L takes 6 quarts.
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Unread 04-08-2009, 05:09 PM   #8
depebush
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so if its short a quart will it knock ?
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Unread 04-08-2009, 05:11 PM   #9
DaveMurray
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Even if it wasn't the lack of oil causing the knocking, why wouldn't you fill the oil to the FULL line?
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Unread 04-08-2009, 05:15 PM   #10
depebush
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i thought it was gonna be enough
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Unread 04-08-2009, 05:32 PM   #11
98zjdave
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Originally Posted by depebush View Post
i thought it was gonna be enough
You should always fill it up all the way, running low a quart of oil isnt the worse thing you can do, but lets just say its not the best either. Fill that last quart up with a quart of lucas and go from there.
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Unread 04-08-2009, 05:39 PM   #12
walter_da_jpr
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From my own personal experience 5.5-5.75 quarts is the magic number. Remember that some oil stays in the crankcase.

I usually fill it to 5.5, drive it, let it sit for a bit, then read the dip stick and bring it to full. It never takes 6 to fill it.

Just dumping in 6 is not necessary and IMO not worth the risk of overfilling even slightly.

Also being down roughly 1 qt should not cause knocking.
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Unread 04-08-2009, 06:59 PM   #13
dougy147
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Quote:
Originally Posted by walter_da_jpr View Post
From my own personal experience 5.5-5.75 quarts is the magic number. Remember that some oil stays in the crankcase.

I usually fill it to 5.5, drive it, let it sit for a bit, then read the dip stick and bring it to full. It never takes 6 to fill it.

Just dumping in 6 is not necessary and IMO not worth the risk of overfilling even slightly.

Also being down roughly 1 qt should not cause knocking.
With the 4.0s I had and my 4.7 I dump in the 5 quart jug and then 1/4 to 1/2 of the 6th quart, start and let idle for a few minutes and recheck.

I always ran Lucas in my ZJ after 120k or so. I would use almost a quart in the summer, and about 1/2 in the winter. That helped a lot. I would also advise against a certain orange filter, that happens to have FRAM painted on the side In my very limited experiences with them on a 4.0 the anti-drainback valve or whatever you want to call it was less than adequate

Oh, and since I don't think it's been mentioned....9k is probably a little long if your not running synthetic.
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Last edited by dougy147; 04-08-2009 at 07:02 PM.. Reason: had a final thought...
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Unread 04-08-2009, 07:13 PM   #14
gatorayde
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9k intervals and a quart low, awesome maintenance (not). It could be a typical 4.0 or it may be on it's way out (which I wouldn't doubt).
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Unread 04-08-2009, 08:15 PM   #15
depebush
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well I added another quart still no improvement so I dont know it may be a lifter or a rod , how much longer do i have til it gets really bad
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