4.0 Engine flush?
#1
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Location: New Castle, Delaware
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Year: 91
Model: Cherokee
Engine: 4.0
4.0 Engine flush?
My 91 cherokee with the 4.0 has almost 260,000 miles on it.The engine runs good but there is sludge buildup.The person I sold my GMC to reccomended that i buy this stuff called motor flush.Has anyone on this forum used this before?
#2
Registered User
Have you tried running some seafoam through it yet?
#4
Registered User
http://www.seafoamsales.com/motorTuneUp.htm
Many use it and claim it works wonders, that said I have never used it myself.
Many use it and claim it works wonders, that said I have never used it myself.
#7
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Year: 87
Model: Wagoneer
Engine: 4.0 I6
Diesel and kerosene or also great one. I have seafoamed both my Renixes. But didnt do too much. Try Diesel only a quart for 15 min. then drain and change filter
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#9
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Year: 90
Model: Cherokee
Engine: 4.0
Ive done similar...
But I drain the oil, screw on an El-cheap filter... Pour in a gallon of diesel. Run it 15 minutes, drain it, put on a good filter, refill with good oil... Works like a champ...
#10
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Year: 1990XJ/1989MJ
Model: Comanche
Engine: 4.0L Renix
Did this on a flathead plymouth and then drove it from Chicago to Maryland. Great car. They just don't make cars like that any more.
#12
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Year: 1990XJ/1989MJ
Model: Comanche
Engine: 4.0L Renix
Fram is an excellent filter for this purpose but the store brands are usually cheaper and do as well as a Fram. The diesel/kerosene flush always works but if your engine was on it's last legs then it will knock those legs out from under it. So be aware!!!! But it will be cleaned out when you do the rebuild. Have to look for the silver lining to every dark cloud.
#14
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Year: 1990XJ/1989MJ
Model: Comanche
Engine: 4.0L Renix
Did it on my first Renix era Jeep an '89 and it had 248,000 showing and the odometer didn't work any longer. About 6 months after the flush I started getting lower oil pressure at idle down to less than 5 pounds. Tore the engine down and built a stroker that went into a buddies CJ7 that was a good engine but the diminished oil pressure was a concern. But with the stroker build we changed cranks anyway, so no big deal. Only took ten over bearings anyways. When I left Georgia that Renix was still tearing up the hunting lease in that CJ7. So that is my only disclaimer experience/
#15
I guess when I think about it, diesel is really is a solvent. Shouldn`t be any reason why that wouldn`t work. Matter of fact, I like that idea.
and you are right blue,, I had an old valient with a slant 6,, tried to blow it up on the freeway once,, valves just started floating till the rpms came down a little.
and you are right blue,, I had an old valient with a slant 6,, tried to blow it up on the freeway once,, valves just started floating till the rpms came down a little.