cherokee90

i have a 1990 jeep cherokee, ive had it for 2 years and only work on it during the summer. its time to bring it back out and get it running good for hidden falls adventure park.

some back ground on the jeep. its a 90 cherokee, 4.0,chopped like a truck, 32 tires, 3 lift. and i have sucked water up in the motor 2 times , (i built a snorkle after this last time) but now my jeep smokes when i rev it up. i already replaced the head gasket after sucking up water, do you think its bad valve seals? do these motors like eating oil?

CherokeeSport98

Ouch! thats not good to do to often hahaha
I would guess that you need new valve seals.

cherokee90

thats what im guessing. what year head will fit on my 1990 motor?

CherokeeSport98

Im not to sure to tell the truth. I would need some more info on your jeep, Or you could do a quick look up on google to see if there is any info

cherokee90

i looked on google and nothing in detail. im wondering if anyone has had this problem before , first hand experience.

alpine.adrenaline

I think you'll want the head off of an '87-'90. X2 on the valve seals.

cherokee90

thats what i keep reading but theres a couple places i read that all the way to 93 are the same?

fishtaconc

you can use 87-06 to be honest but above 90 youll need to get the intake IIRC but if you can find a 91+ do itll get a little power due the better flowing ports HTH

truckntractorhick

^06?

warthog

First off what color is the smoke and have you done a compression test or a cylinder leak down test?

cherokee90

its not coolant being burned its burning oil. and i plan on doing a compression test this weekend just wondering if its possible i warped a valve with the cool water hitting a hot valve or something like that. and its blue smoke...

fishtaconc

The TJ used the 4.0 up to 2006, I was stating that any 4.0 Head could be used. When you do the compression test if a cylinder is low you could put about a teaspoon of oil in that cylinder if it comes back up (compression) its rings if not burnt/warped valve is possible. But im thinking valve seals,also does it smoke more when first started after sitting, if so thats a good sign of needing new seals.

razor02097

Smoking.... if it really bothers you then...

A leak down test would be better. It would help tell you if your rings are leaking.

If you can't then take a compression reading, put a tablespoon of oil in the cylinder and repeat. If the compression went up then you have bad rings. If not then it is most likely the valve problem.