Engine Knocking after fresh oil
CF Veteran
Joined: Sep 2010
Posts: 12,692
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From: Mercer County, NJ
Year: 2001
Model: Cherokee
Engine: 4.0L I6 HO
I sure hope the PO didn't put something in the motor to quiet things up until he offed it.
As far as what to do if there is sludge bad under the valve cover? I'd clean as much of it out as I could by hand first plugging up ports to keep it from going down into the motor.. Then do the fresh oil/MMO combo changing it and the filter frequently.
As far as what to do if there is sludge bad under the valve cover? I'd clean as much of it out as I could by hand first plugging up ports to keep it from going down into the motor.. Then do the fresh oil/MMO combo changing it and the filter frequently.
CF Veteran
Joined: May 2015
Posts: 1,472
Likes: 5
From: San Antonio, TX
Year: 1992
Model: Cherokee
Engine: 4.0L H.O.
And how can you not love that smell?
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
I'm curious what he has. "L6" narrows it down a bot. Is that a 2.8? Or if that sludge is creamy maybe an 00, 0r 01?
Last edited by DFlintstone; Aug 10, 2015 at 06:57 PM.
CF Veteran
Joined: Aug 2010
Posts: 8,357
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From: Canton, MI
Year: 1999
Model: Cherokee
Engine: 4.0
Thread Starter
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Joined: Jul 2015
Posts: 134
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From: Nashville, TN
Year: 94
Model: Cherokee
Engine: 4.0L
Sorry guys I work nights so I was asleep/working during all your great advice. Still working actually... I'll make sure to get back to each of you.
Thread Starter
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Joined: Jul 2015
Posts: 134
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From: Nashville, TN
Year: 94
Model: Cherokee
Engine: 4.0L
Def change out filter. You can do a Napa gold 1515 as well. Oversized filters FTW.
As for the knock. Don't go crazy adding additives and expensive oil just yet. Pull the valve cover off. Inspect first. You def knocked crap loose but.you don't want it going to the wrong places. You may have to run reg conventional and do more frequent changes for a month or two and then go to something like rotella, Mobil etc. There's a worse case you'll have to pull the oil pan but start with the valve cover first. Noggin poke and see what you have to do to your girl
As for the knock. Don't go crazy adding additives and expensive oil just yet. Pull the valve cover off. Inspect first. You def knocked crap loose but.you don't want it going to the wrong places. You may have to run reg conventional and do more frequent changes for a month or two and then go to something like rotella, Mobil etc. There's a worse case you'll have to pull the oil pan but start with the valve cover first. Noggin poke and see what you have to do to your girl
Thread Starter
Member
Joined: Jul 2015
Posts: 134
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From: Nashville, TN
Year: 94
Model: Cherokee
Engine: 4.0L
Looking under the oil filler cap sounds a lot easier than taking off the cover. I'll make sure to get photos once the sun comes up.
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Joined: Jul 2015
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From: Nashville, TN
Year: 94
Model: Cherokee
Engine: 4.0L
CF Veteran
Joined: Jan 2015
Posts: 1,508
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From: Oregon Coast
Year: 1999
Model: Cherokee
Engine: 4.0L I6
Engine Knocking after fresh oil
It's typically said the other way around because it causes leaks. Other than that I have never heard a single valid reason. I even question that because I've never experienced it.
Member
Joined: Jun 2015
Posts: 113
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Model: Cherokee
Open it up and check the flex plate bolt by hand. If it comes loose by hand then you need something to keep it from coming loose via vibration; hence the locktite. To prevent the engine from turning, I used a screwdriver wedge between transmission housing and flex plate. Tighten to specs.
For a temporary filter, Microgard, O'Reilly's house brand, is made by WIX. I've read its equivalent to NAPA Silver. My rig also sat for awhile and a couple of oil changes and one Gunk chemical flush still didn't clean it all. I finally removed the oil pan and cleaned it yesterday (including installing a rear main seal). Still putting it back together but it had about 1/8" of sludge in the pan and hard deposits which I removed with a scrub pad.
Less work would be taking it to a shop and have a machine engine flush done. And if they remove the pan can check on the rod knock.
CF Veteran
Joined: Jul 2013
Posts: 7,554
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From: Monett, MO.
Year: 1999
Model: Cherokee
Engine: 4.0
Lol, not at all. Some rotella and MMO mix is a really good one. I'm more worried of things loose in too much too fast. Rather just try and use oil to get the larger stuff out of possible first.
OP, take a picture of your valve cover when it's off. I can't wait to ser what it looks like
OP, take a picture of your valve cover when it's off. I can't wait to ser what it looks like
Yes same here sounds like he has a lot floating around already, I would wait for a while.
I sure hope the PO didn't put something in the motor to quiet things up until he offed it.
As far as what to do if there is sludge bad under the valve cover? I'd clean as much of it out as I could by hand first plugging up ports to keep it from going down into the motor.. Then do the fresh oil/MMO combo changing it and the filter frequently.
As far as what to do if there is sludge bad under the valve cover? I'd clean as much of it out as I could by hand first plugging up ports to keep it from going down into the motor.. Then do the fresh oil/MMO combo changing it and the filter frequently.
That used to be done a lot when I was younger, people using some 90wt. gear lube to quiet things down. Same for a noisy differential just add saw dust to the heaviest gear lube, works OK for a few hundred mi.
No its not a problem to do so.
