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Old 11-16-2019, 02:12 PM
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Leaking NSG370 ('12 JKUR)...simple as a blocked vent, or more?

I was under the Jeep today tracking down a noise, when I noticed there was transmission fluid collected on the bellhousing, crossmember, and even a little on the exhaust crossover. After checking the drain plug to make sure it was still tight, I noticed it was coming from the front of the bellhousing, mostly on the passenger side.

I've heard that sometimes the breather vent up under the shift boot gets blocked, would that be enough to cause something like this? Is there any way to get to the vent on a '12+ JK other than removing the console? I'm planning on trying that tomorrow, before I freak out that a major seal is going...

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Old 11-16-2019, 02:36 PM   #2
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Engine oil leak? Rear main seal or oil cooler?

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Old 11-16-2019, 03:13 PM
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I shone a flashlight in front of the oil filter canister, and there wasn't any oil pooled there, so I'd *think* that the cooler was fine? Is there a diagnostic for a rear main?
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Old 11-16-2019, 08:51 PM   #4
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oil cooler...
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Old 11-17-2019, 04:12 PM   #5
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Quote:
Originally Posted by KG4NEL View Post
I shone a flashlight in front of the oil filter canister, and there wasn't any oil pooled there, so I'd *think* that the cooler was fine? Is there a diagnostic for a rear main?
To check the rear main seal, pull off the rubber grommets and shine a flashlight up at the back of the engine. Look for any oil up there.

I'd also check the PCV valve. It's on the passenger side of the engine, in the rear.
. When we had a leak there, I found it by feeling around that area.

However, both of these leaks would be oil, not transmission fluid. If you have a transmission cooler (I believe all auto transmissions JK have them), it could be coming from the lines to the radiator.
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Old 11-27-2019, 02:43 AM   #6
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Quote:
Originally Posted by KG4NEL View Post
I was under the Jeep today tracking down a noise, when I noticed there was transmission fluid collected on the bellhousing, crossmember, and even a little on the exhaust crossover. After checking the drain plug to make sure it was still tight, I noticed it was coming from the front of the bellhousing, mostly on the passenger side.

I've heard that sometimes the breather vent up under the shift boot gets blocked, would that be enough to cause something like this? Is there any way to get to the vent on a '12+ JK other than removing the console? I'm planning on trying that tomorrow, before I freak out that a major seal is going...

Thanks!
Taking off that tower is nothing compared to alternative. Iím gonna assume that youíre sure itís transmission fluid.

Not to freak you out...Possible input shaft seal. Hopefully itís not. Quite a different thing than output shaft seal. Have you checked slave cylinder and the area around that?
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Old 11-27-2019, 02:44 AM   #7
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To check the rear main seal, pull off the rubber grommets and shine a flashlight up at the back of the engine. Look for any oil up there.

I'd also check the PCV valve. It's on the passenger side of the engine, in the rear. You can get more info on it here. When we had a leak there, I found it by feeling around that area.

However, both of these leaks would be oil, not transmission fluid. If you have a transmission cooler (I believe all auto transmissions JK have them), it could be coming from the lines to the radiator.
Title states itís the manual transmission. No cooler lines on a manny tranny.

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