98 sport 4.0 Bad engine - JeepForum.com
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post #1 of 35 Old 01-22-2017, 08:33 PM Thread Starter
wvabeer
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98 sport 4.0 Bad engine

I am getting ready to purchase this with 319000 miles the lady said it over heated and it quit. They took it to a garage they said bad motor. I go briefly look it over as she was the owner for the last 6 years. I start it, it started right up but its a trashing machine. I shut it down it has oil in it. Any input???? I was hoping to fix it and not a complete rebuild but it isn't beyond my capacity.

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post #2 of 35 Old 01-23-2017, 05:10 AM
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At 319K, the ONLY way for you to come out on this deal is to get it for a great price. It's really impossible to determine the problem without some testing (compression tests, leakdown, etc).

You have to factor in worst case into your offer and that means, if you buy it and it needs a different engine or a rebuild, will you be okay with the amount of money you have into it after doing that. And at 319K, it's going to likely need other work too.

How much are they asking?
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post #3 of 35 Old 01-23-2017, 05:32 AM
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My question would be how the body? IE no rust? If no rust then it might be viable to put in the money. If a rust bucket, then run. If you decide to get it, Id look at Car-PartsInc.com/. It will list parts across the US and Canada by Make,model, year and parts. Also by State and region. I'd probably look for a lower mileage motor and trans. Trans are usually $75 or so.
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post #4 of 35 Old 01-23-2017, 09:16 AM Thread Starter
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$400. It's beat up a little as it was used as a rural mail vehicle. The only rust that I saw was left rear rocker. I think she kept up on maintenance pretty good from what she was telling me. She said the trans and 4x4 worked great, she used it for 6 years.
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post #5 of 35 Old 01-23-2017, 10:14 AM
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The two places to look for rust are underneath the driver's seat area and right above the muffler. Sometimes the pistons crack, and you can just replace the one. 319K is getting towards the end of the life cycle of the Jeep 4.0L.
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post #6 of 35 Old 01-24-2017, 08:47 AM Thread Starter
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Well I have more about this now this is the third motor and second trans. The engine was put in a year ago, used.
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post #7 of 35 Old 01-24-2017, 03:45 PM
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Consider $400 to be the price of a low rust body. The rest is up in the air, could require as much as a full engine swap or as little as a cooling refresh and a CPS.

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post #8 of 35 Old 01-25-2017, 05:12 AM
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OK, price wise at $400. I've been down this road or rabbit hole twice. The first was one a tree fell on it. Don't laugh, a few inches and the guy would have been dead. The other was the worst interior I've seen. OK, no dead body, so there are worst out there. Blown motor, smacked in the front and side.. The first I think I had $1600 in it. The second about $8K.
On yours, I'd judge it by rust. If only the rear quarter panel, then I might go for it. I'd guess $400 for a used 4.0L Then I'd put in a low mileage trans, about $100. I'd probably put in a rebuilt torque converter. I don't know where in WVa you are. I have a place in Webster Springs. If close to Ohio, check out Marshall's in Centerville (or Circleville). Its a bit SE of Columbus.
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post #9 of 35 Old 01-25-2017, 08:13 AM Thread Starter
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OK, price wise at $400. I've been down this road or rabbit hole twice. The first was one a tree fell on it. Don't laugh, a few inches and the guy would have been dead. The other was the worst interior I've seen. OK, no dead body, so there are worst out there. Blown motor, smacked in the front and side.. The first I think I had $1600 in it. The second about $8K.
On yours, I'd judge it by rust. If only the rear quarter panel, then I might go for it. I'd guess $400 for a used 4.0L Then I'd put in a low mileage trans, about $100. I'd probably put in a rebuilt torque converter. I don't know where in WVa you are. I have a place in Webster Springs. If close to Ohio, check out Marshall's in Centerville (or Circleville). Its a bit SE of Columbus.
I have a camp close too, Gauley river road. I am doing this Cherokee for a camp/rescue vehicle for us side by side guys.
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post #10 of 35 Old 01-25-2017, 03:41 PM
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As for the thrashing sound, It depends what part of the engine it is coming from. High, low or medium. I'm a bit out of my experiences here. Also, the trans torque converter nuts come loose, those can make a rattle. Over heating can be as simple as the radiator cap, water pump, thermostat, to the radiator itself or a blown head gasket. Just guesses. $400 and some rust and what you are planning for it, might be OK. Still, they can be a money pit.
As for engine noise, bad lifter or cam lobe gone bad, bad crank bearing(s), possibly a bad piston or rods or in the valve train.
I'm on rt 26 going to Bergoo.
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post #11 of 35 Old 01-26-2017, 04:11 PM Thread Starter
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Compression test is all over from 0 to 155. It runs but sounds awful. It must have a bad head gasket because of pressure in the cooling system. Head comes off first. Unless I get carried away.
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post #12 of 35 Old 01-26-2017, 04:13 PM
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So....you bought it?

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post #13 of 35 Old 01-26-2017, 04:19 PM Thread Starter
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So....you bought it?
Yep , I love punishment
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post #14 of 35 Old 01-26-2017, 04:29 PM
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Good luck!
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post #15 of 35 Old 01-27-2017, 05:23 AM
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Looks OK from the one picture. Hard to tell though from one pic. Don't know if you put some oil in the cylinder and retest for pressure. If it increases, then rings or pistons. If not, then head gasket or valves. The coolant is probably as you stated a head gasket. Also, check Car-Parts.Inc.com for parts. It will list parts by state or regions. I saw some in WV. I think one dealer up in Freemont (??).
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