Gear Box leak

1941 - 1945, MB, GPW Technical questions and discussions, regarding anything related to the WWII jeep.
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REG
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Gear Box leak

Post by REG » Fri Sep 01, 2017 11:30 am

I had my gear box overhauled a couple of years back with a double seal inserted to arrest the migration of oil from gear box to transfer case. I am only now getting a leak.
After a couple of thousands of miles of use is there a more likely place to check to see if anything needs nipping up to stop the leak?
Many thanks
REG
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cjv-35
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Re: Gear Box leak

Post by cjv-35 » Fri Sep 01, 2017 11:34 am

You failed to mention where you see the leak developing from. Bell housing, shift tower, ect.

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ghiltgen
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Re: Gear Box leak

Post by ghiltgen » Fri Sep 01, 2017 5:54 pm

I would take off the skid plate and look very carefully. Certainly the Transfer case its self is prone to leaks and weeps because there are 4 seals: one for each shift rod and one for each output yoke. Check the vent on the top of the transfer case as well. If it is obstructed due to mud or grease, the pressure from inside the transfer case builds up and cases weeps of oil through the seals.
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fernando mendes
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Re: Gear Box leak

Post by fernando mendes » Wed Nov 15, 2017 9:58 am

ghiltgen wrote:
Fri Sep 01, 2017 5:54 pm
I would take off the skid plate and look very carefully. Certainly the Transfer case its self is prone to leaks and weeps because there are 4 seals: one for each shift rod and one for each output yoke. Check the vent on the top of the transfer case as well. If it is obstructed due to mud or grease, the pressure from inside the transfer case builds up and cases weeps of oil through the seals.
How can I check,how to dismount and clean it?
Jeep Willys MB DoD dec,16 1942 s/n:196275
Dodge B3-B 4x2 1952 s/n:90099559
CCKW 353 Banjo 1944 s/n:309623

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Chuck Lutz
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Re: Gear Box leak

Post by Chuck Lutz » Wed Nov 15, 2017 11:21 am

FIRST...
Determine if the "leak" is truly a leak...
1) remove the skid plate so you can see what's what under there
2) check the level of gear oil in both the T84 and the T/C and not how many ounces it takes to bring them both up to full.
3) using rags and Brakekleen or something, remove any and all gear oil from the T84 and the T/C
4) drive the jeep for a couple hours or so or an hour or so on a couple days
5) check the drip pan or cardboard you keep under the jeep to see if you can tell where the leaks are coming from
6) after some miles/time, check the levels in the T84 and T/C again.

If the T/C is LOW and the T84 is full or overflowing, then you know gear oil is migrating from the T/C to the T84 and possibly along the splines rather than through the rear sealed bearing and once it fills the T84 high enough, it escapes through the front bearing return hole (unless you plugged that?).

If the T/C is LOW and the T84 is right at FULL and not pouring out when you remove the plug...then you may be losing gear oil from the T/C via the vent on top of the T/C.

If the T/C is right at FULL and the T84 is LOW, then possibly the bolts between T84 and T/C are LOOSE and need tightening up.

If the T/C is FULL and the T84 is full, then smell the oil as motor oil and gear oil smell differently and check to see if the leak is actually from the bellhousing and is blowing back on the T84 and T/C when driving.

Do NOT remove the T84 & T/C until you KNOW where the leak originates from! If it is motor oil, it may be a leaky rear main or simply oil leaking from somewhere around the engine...most likely the pan gaskets.
Chuck Lutz

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fernando mendes
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Re: Gear Box leak

Post by fernando mendes » Thu Nov 16, 2017 1:14 am

Excelent threads about T/C and T84 maintenance.Thanks guys. :D
Jeep Willys MB DoD dec,16 1942 s/n:196275
Dodge B3-B 4x2 1952 s/n:90099559
CCKW 353 Banjo 1944 s/n:309623

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ghiltgen
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Re: Gear Box leak

Post by ghiltgen » Sun Nov 26, 2017 3:40 pm

Sorry for late response. The vent is directly behind the right the shift canes on top and right front of the transfercase. Cap is held on by a cotter pin. You might need to clean it with a brush to get dirt and hardened grease off. Can use compressed air to blow it out after the cap is off. It is somewhat hard to get to with the body on but not impossible.
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Re: Gear Box leak

Post by fernando mendes » Wed Dec 06, 2017 12:42 pm

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Jeep Willys MB DoD dec,16 1942 s/n:196275
Dodge B3-B 4x2 1952 s/n:90099559
CCKW 353 Banjo 1944 s/n:309623


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