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Unread 10-23-2002, 08:36 AM   #1
GRAVEE1K
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Engine Flush

The YJ is up to 120k and I was asking some guys that race ricers at work if they had considered using engine flush before oil changes? What do you guys think about it? I worry about it not washing completely out of the motor and breaking down the fresh oils viscosity? So does anybody use it? Hate it? They all recommended the GUNK engine flush.

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Unread 10-23-2002, 08:49 AM   #2
Mels95YJ
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Personally, I wouldn't waste my money. Here's my reasoning. All the gunk buildup that you wash away has to go somewhere. I've heard of people having to replace their oil sending unit because all the gunk deposited there. Also, that gunk is sealing any cracks and/or crevices that keeps you from leaking oil. Without that gunk, you may start noticing some oil leaks. It's pretty much the same as switching to synthetic oil. If everything is fine now, why tempt Mr. Murphy? If it isn't broke, don't fix it! Just my $.02

Mel
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Unread 10-23-2002, 08:58 AM   #3
GRAVEE1K
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Yeah I need to replace the pan, I crunched mine on a rock and it currently is held with JB and silicon, so I was thinking about making sure the new one is ultra clean and just leaving it, oh and checking the screen on the pump. I had a 22R motor crap out at 120k because a clump of crap broke loose and clogged the screen and I guess I want to make sure that don't happen to my YJ, since all the crap settles and seems to harden in the pan I guess cleaning it would be the right thing.
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Unread 10-23-2002, 12:18 PM   #4
NaeKid
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When you replace the pan, make sure that everything on the bottom of your engine is nice and clean, oil pickup nice and clean .. and that the new pan going in (used, or new?) is clean inside and out (for a good seal).

You should be fine .. don't really need to worry about the top side .. unless you are planning on taking it apart anyways ..
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Unread 10-23-2002, 03:06 PM   #5
GRAVEE1K
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Yeah thats more along the lines of what I was thinking and skip the GUNK treatment.......
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Unread 10-24-2002, 03:17 AM   #6
DanyJeep
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the gunk treatment has some very strong chemicals in it which does kinda get the crap out but also chews on your gaskets and seals. be careful not a regular thing to do.
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Unread 10-24-2002, 03:48 AM   #7
Gator
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heres a old trick...
ATF! Automatic Transmission Fluid
it has been used for years removing the hard grease you build up on your hands, & the ATF is easily washed off with Soap & water

I've done this several times < about every 35-50K Miles> on all my vehicles & about everty other oil change I'll substitute 1/2 quart of ATF for Oil
drain the oil, replace drain plug,leave filter on, fill like normal with ATF, crank engine & let IDLE for 10-15 mins dont drive it, or rev the engine... just idle
any Sludge or gunk or build up, it will break down & clean & wont harm anything if theres anything Atf left & the new oil added
its a hell of alot cheaper than buying engine cleaners or anything like that

its one of the best cleaners you'll find for caked grease...
get axle grease on your hands, rub some atf on them & the Atf will cut the axle grease, then wash with soap & water

My 1 ton, has 150K miles on it... I bought it when it had 100K miles, done this & every other oil change, no leaks, engine doesnt use oil & i still get around 14-15 mpg with a regular scheduled tune up.... even with a 454 Cu in TBI, & 5.13 gears
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Unread 10-24-2002, 08:26 AM   #8
GRAVEE1K
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Hmmm I have heard of ATF to break up carbon in the cylinders but not in the crank case??
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Unread 10-24-2002, 10:19 AM   #9
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Quote:
Originally posted by Gator
its one of the best cleaners you'll find for caked grease...
get axle grease on your hands, rub some atf on them & the Atf will cut the axle grease, then wash with soap & water
I use WD-40 to clean my hands before diggin' into the pizza
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Unread 10-24-2002, 05:43 PM   #10
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yeah i've heard of the ATF trick being used.. especially if you have noisy/dirty lifters.. basically.. the ATF foams up in the oil and really does a good job of being a surfactant (that's a grease remover to you laymen). I use the engine flush stuff however religiously.. here's how I use it though..

Run around in your rig on errands.. getting the oil and filter and stuff.. when you get home.. leave the engine running and pour in your engine flush stuff (whether it be Gunk, ATF, or some other brand) and let the engine idle for 10-15 minutes. I then drain oil as usual. Really gets the crud out.. and the Hot Oil seems to melt the sludge pretty good and get it circulating through the filter and dissolved into the flush solvent.. then fresh filter and oil and you're good for a few more thousand miles.. avoid that Z-Max crap that says it does the same job as the solvent/ATF trick.. it's a waste of money.
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