98 sport 4.0 Bad engine - Page 2 - JeepForum.com

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post #16 of 35 Old 01-27-2017, 10:32 AM Thread Starter
wvabeer
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She said it was making some ticking noises then it over heated and stopped. I found a bottom rad hose with a hole, I'd say that's what caused the over heat. Ya think a head gasket would give ya a zero pressure reading in number two?

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post #17 of 35 Old 01-27-2017, 12:30 PM
bluejunior
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It's certainly possible. Any other signs of a bad head gasket?

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post #18 of 35 Old 01-27-2017, 12:48 PM
75SV1
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Is it just ticking or a louder noise. The Zero pressure is of a concern. I'd be trying to rule out problems before taking off the head. I'd probably take off the valve cover and see what is happening there or condition of the valve train first. A ticking can be a dirty or collapsed lifter. Sometimes running a cleaner in the oil will free up a lifter.
You said you ran it, and it was thrashing (??). Ticking or knocking? Clattering or thumping?
Also, if you put on a new hose and fill up the radiator fluid, see if there are bubble in the coolant (with the pressure cap off) or it looses a lot of coolant. I'd probably take off the valve cover before this and check the valve train. I have run mine 'HOT' as in the belt broke and coolant boiled out. The engine still runs. I did have the head repaired and new gasket put on at one point. I purchase a motor from a salvage yard. Yes, at that time it had a bad head gasket.
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post #19 of 35 Old 01-27-2017, 03:07 PM Thread Starter
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I ran it last night after filling the cooling system I then started it and ran it to see if the power steering worked , after I shut it off water was gushing out of the hole in the hose. If i remember pressures 1,125lb 2,0lb 3,120lb 4,155lb 5,127lb 6,75lb but I'm still going to take the head off and resurface the head and reassemble. I ain't loaded, gotta be able to buy beer.
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post #20 of 35 Old 01-29-2017, 02:27 PM Thread Starter
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I think I found the problem.
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post #21 of 35 Old 01-29-2017, 02:28 PM
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Quote:
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I think I found the problem.
That MIGHT be it...

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post #22 of 35 Old 01-29-2017, 04:48 PM Thread Starter
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I ran a straight edge on the head, looks warped.
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post #23 of 35 Old 01-30-2017, 05:10 AM
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Should be able to just replace the one piston. From memory, they used a few different sizes. So need to match the one being replaced. I'd also pull the lifters and check the cam lobes. Reinstall the lifters in the same bore it cam of. I'd probably put a coating of GM assembly lube on the lifter. If replacing lifters, then I'd definitely use GM assembly lube or something.
I would wonder about the block being flat. I think FELPRO makes head gaskets that are for rougher or not so flat applications.
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post #24 of 35 Old 01-30-2017, 07:21 AM
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Should be able to just replace the one piston. From memory, they used a few different sizes. So need to match the one being replaced. I'd also pull the lifters and check the cam lobes. Reinstall the lifters in the same bore it cam of. I'd probably put a coating of GM assembly lube on the lifter. If replacing lifters, then I'd definitely use GM assembly lube or something.
I would wonder about the block being flat. I think FELPRO makes head gaskets that are for rougher or not so flat applications.
I swear a couple years ago when I was looking at stroker stuff I noticed the felpro one starts out thicker than the mopar one but torqued down to the same, maybe it's supposed to fill gaps if there's a small amount of warping

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post #25 of 35 Old 01-30-2017, 01:04 PM
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If I remember it was on my '97 Neon. The engine was over heated. I 'sanded' down the head flat. Used an inspection (granite) table. I believe I went to NAPA, they had two choices, regular or severe duty or such. I went with the severe duty. If I remember it described it for uneven surfaces. I think it is what the OP should use.
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post #26 of 35 Old 01-30-2017, 05:22 PM Thread Starter
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I ran a straight edge across the block and it looked fine. the head was warped. I plan on replacing all 6. I am having a local fella do the head.
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post #27 of 35 Old 01-31-2017, 07:34 AM
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At this point, if it were me, I would pull the whole engine out of the jeep. If you are going to get as deep into as you are you might as well go the whole nine. They are other parts to think about replacing as well. Maybe just stroke it.
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post #28 of 35 Old 01-31-2017, 01:51 PM Thread Starter
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I am pulling it out and doing the head, pistons, bearings and oil pump. Maybe the cam if it wore. Man this thing is a not a jewel, I am going to try not to have more than 1000 bucks in it. It isn't worth that much at 319000 miles.
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post #29 of 35 Old 02-02-2017, 06:09 PM Thread Starter
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Where can I find a download of the 4.0 engine specs tolerances for bearings, pistons,rings etc.... ?
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post #30 of 35 Old 02-06-2017, 09:49 PM
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Get yourself a Haynes repair manual, you will need it for all kinds of things on these Cherokee's.
By the way I am also in Evans,wv.
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