Manual transmission oil leak

1980CJ7

MEMBER
1980 JEEP CJ7
5.0L
V8
4WD
MANUAL
100,000 MILES

Hello, need some help figuring out what is causing this leak?

Oil pukes/leaks out only when vehicle is running. Leaks from when starter is bolted in.

Yellow looking fluid is related to water getting mixed with water.

Possibly manual transmission input deals?

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8 Replies

MOTOR MASTER

MECHANIC
279 POSTS

Hello
My name is Dave, I have a two questions that will hopefully narrow the cause. Have you happened to check the oil in the transmission and if so does it have the same "chocolate milk" appearance and if not does the engine oil have that look. I would fully expect one of the two to show mixing with water if we can start there then that will help to narrow down the cause. Hope to hear back from you soon and thanks for using 2CarPros!

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Sunday, October 7th, 2018 AT 1:27 PM

1980CJ7

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10 POSTS

Manual transmission had that matching fluid. Engine oil is clean. Thanks

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Sunday, October 7th, 2018 AT 3:30 PM

CJ MEDEVAC

MECHANIC
11,005 POSTS

On vacation with the wife at Disney World.

I am on my laptop and do not have access to a lot of my desktop pictures and diagrams.

Walked many miles today!

Sounds like the front transmission seal is failing, this would be the one in the front bearing cap.

My suspicions with the transmission juice is that the transmission has been submerged. Along with that, the transfer case and both differentials will most likely be the same way when you drain them.

Have you done any drive-train fluid change outs with your Jeep?

The Medic

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Sunday, October 7th, 2018 AT 10:05 PM

1980CJ7

MEMBER
10 POSTS

Hi, yes I drained the manual transmission fluid. As you can see in the picture color matches the leak from the starter.

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Thursday, October 11th, 2018 AT 1:17 PM

CJ MEDEVAC

MECHANIC
11,005 POSTS

Unless your engine oil is looking the same, It has to be your transmission leaking.

Just a possibility that you may have gotten lucky.

If the transmission was way overfilled with water, the transmission fluid and goo may have forced its way past the seal.

It may be worth a try to drain your entire drive train (both differentials, transfer case, and transmission) and get them to the proper levels. Maybe the seal(s) will hold now.

Now refill them through the fill holes and they all will be full when the fluid starts to come back out of the fill holes. I usually then give them two or three additional squirts and quickly screw the plugs back in. In the future I can barely screw a plug out, if I get fluid running out of the hole, I know it is still full.

Think this might work out for you?

The Medic

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