Valve Cover Gasket Replacement - Gunk City.

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Nov 26, 2013 | 02:25 PM

#46

investinwaffles

CF Veteran

Joined: Oct 2013

Posts: 2,097

Likes: 12

From: Tarpon Springs, FL / Denver, CO

Year: '98

Engine: 4.0 I6

I run Rotella T6 all year but have recently started substituting for 1qt of Marvel Mystery Oil. The MMO really quieted down my valve/lifter tick, and it makes the oil turn dark pretty fast.

Recently, before each oil change, I drive the Jeep for 1hr or so, then add .5qt of ATF and let it idle for 30 mins or so. Oil is always black when I change it at 2500 miles.

Hoping that this will help clean out the motor slowly, to avoid any chunks breaking up, but I might try the B12 Chemtool for a more powerful flush after a few more slow-cleaning cycles. The head under the valvecover doesnt look that grungy though.

Nov 26, 2013 | 06:26 PM

#47

JDHDrum

Junior Member

Joined: Nov 2013

Posts: 36

Likes: 0

Quote:

Originally Posted by Turbo Supra

I was told seafoam is a good solvent when mixed with the oil. I've been told to go the diesel oil route, kerosene, and seafoam. Seafoam seemed to be the most suggested. I'm not sure how aggressive diesel oil will be, and i'm not sure if being more aggressive is necessarily a good thing. I'm open to suggestions...

Before and after photos of this cleaning process and what you used to clean it would be awesome if you are willing.

Nov 26, 2013 | 06:43 PM

#48

kgm

CF Veteran

Joined: Oct 2013

Posts: 1,589

Likes: 2

From: Denver

Year: 99

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by CCKen

They're all insane.

Use cheap 5W-30 motor oil and a Motorcraft FL1A filter during the desludge process. FL1A only costs about $4.00.

Then switch to Rotella T6, 5W-40, and a Wix 51515 filter after it looks like the desludge oil starts looking clean.

hahahaha

I did a few 2000 mile OCIs when I got the truck to help clean it out a bit. Pretty sketched out doing an ATF flush.

Last edited by kgm; Nov 26, 2013 at 07:03 PM.

Nov 27, 2013 | 11:41 AM

#49

EdZ

Junior Member

Joined: Nov 2013

Posts: 68

Likes: 0

From: Baltimore, MD

Year: 2000

Model: Cherokee

Engine: 4.0L

Quote:

Originally Posted by salad

If your rings suck and let a ton of fuel into the oil, the gasoline has a pretty thorough cleaning action

Now that right there is FUNNY !!! If the rings suck gas it would smoke a bit too as well as have low compression... To get gas into the oil it would require a leaking injector or failed ignition on at least one cylinder...