Oil leak
01-17-2019, 05:24 AM
#5
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Year: 2000
Model: Cherokee (XJ)
I have to change a bunch of gaskets valve,oil pan , oil adapter and a rear main seal just wondering if there is anything else cause of that oil under the intake
01-17-2019, 06:07 AM
#7
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
CRUISER'S MOSTLY RENIX TIPS
I’d be looking up ABOVE first, and VERIFYING the source of the oil leak YOURSELF.
Everybody, who doesn’t own or have to pay for or perform your vehicle repairs, loves to poke their noggin UNDER the Jeep and come out bearing the false bad news that your RMS is leaking. Many mechanics, friends, and good old Uncle Bob seem to enjoy telling you it’s the rear main seal. Has a catastrophic ring to it, doesn’t it?
A simple leak at the back of the valve cover or other source could produce the same symptoms. You don’t need to be a mechanic to figure this out. If you have good eyesight and a dim flashlight, you’re good to go on your own. Don’t jump on the RMS/oil pan gasket bandwagon right off the bat.
Almost any oil leak on your 4.0 is gonna drip from the RMS area for two simple reasons:
First off, the engine sits nose-up and any oil will run back to the RMS area.
Secondly, the RMS area is also the lowest point on the engine. Simple physics and the old plumber’s adage apply here: “Crap flows downhill”.
Valve cover gasket, oil pressure sending unit, oil filter adapter seals and distributor gasket, in that order, have to be eliminated as possibilities first. A little tip here. Rather than use a dizzy gasket, use an o ring instead. NAPA #727-2024. Tips 12 and 13 will help you get your distributor back in place correctly.
REAR MAIN SEAL DIAGNOSIS
OCTOBER 31, 2015 SALAD 2 COMMENTSI’d be looking up ABOVE first, and VERIFYING the source of the oil leak YOURSELF.
Everybody, who doesn’t own or have to pay for or perform your vehicle repairs, loves to poke their noggin UNDER the Jeep and come out bearing the false bad news that your RMS is leaking. Many mechanics, friends, and good old Uncle Bob seem to enjoy telling you it’s the rear main seal. Has a catastrophic ring to it, doesn’t it?
A simple leak at the back of the valve cover or other source could produce the same symptoms. You don’t need to be a mechanic to figure this out. If you have good eyesight and a dim flashlight, you’re good to go on your own. Don’t jump on the RMS/oil pan gasket bandwagon right off the bat.
Almost any oil leak on your 4.0 is gonna drip from the RMS area for two simple reasons:
First off, the engine sits nose-up and any oil will run back to the RMS area.
Secondly, the RMS area is also the lowest point on the engine. Simple physics and the old plumber’s adage apply here: “Crap flows downhill”.
Valve cover gasket, oil pressure sending unit, oil filter adapter seals and distributor gasket, in that order, have to be eliminated as possibilities first. A little tip here. Rather than use a dizzy gasket, use an o ring instead. NAPA #727-2024. Tips 12 and 13 will help you get your distributor back in place correctly.
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01-17-2019, 07:49 AM
#9
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Year: 1987
Model: Cherokee (XJ)
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Oh oh, after some searching ive found this:
https://www.jeepforum.com/forum/f310...topics/2732706
could be the head gasket.
https://www.jeepforum.com/forum/f310...topics/2732706
could be the head gasket.
01-17-2019, 08:14 AM
#10
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Year: 1990
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No substitute for noggin pokin ....
01-17-2019, 12:02 PM
#11
Old fart with a wrench
Oh oh, after some searching ive found this:
https://www.jeepforum.com/forum/f310...topics/2732706
could be the head gasket.
https://www.jeepforum.com/forum/f310...topics/2732706
could be the head gasket.
01-17-2019, 12:42 PM
#12
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Year: 1987
Model: Cherokee (XJ)
Engine: 4.0
No need getting impolite, i was just figuring out some reasons for my oil leak problem!?! BTW a head gasket is on a 4.0 as well!
Cheers
and please accept oil seepaging out of the head gasket as a possible reason:
https://www.google.de/amp/s/www.jeep...47305/%3famp=1
Cheers
and please accept oil seepaging out of the head gasket as a possible reason:
https://www.google.de/amp/s/www.jeep...47305/%3famp=1
Last edited by Dave00; 01-17-2019 at 01:00 PM.
01-17-2019, 06:59 PM
#13
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Year: 1990
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No need getting impolite, i was just figuring out some reasons for my oil leak problem!?! BTW a head gasket is on a 4.0 as well!
Cheers
and please accept oil seepaging out of the head gasket as a possible reason:
https://www.google.de/amp/s/www.jeep...47305/%3famp=1
Cheers
and please accept oil seepaging out of the head gasket as a possible reason:
https://www.google.de/amp/s/www.jeep...47305/%3famp=1
That 4.7 was a Mercedes design and was not reliable at all.
01-17-2019, 09:46 PM
#14
Old fart with a wrench
There are no oil passages in a 4.0 head. Pressurized oil, that is. Valve gear oil drains back around the pushrods on the passenger's side. I can see coolant leaks from a bad head gasket, but not oil. The reason I suggested the power steering pump is because it's in front of the intake manifold and could be blowing back from the fan's draft. There also could be a pinhole leak in the trans cooler lines, but you'd see a lot more oil from that.
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