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Post by 1stsgtusmc on Dec 13, 2022 15:26:35 GMT -5
Good afternoon fellow Jeppers and Fine Americans! I had my transmission rebuilt by a solid organization and it operates great. The only issue is it leaks from the main shaft while running and sitting in my garage floor. This must be fixed. Any recomendations? Thank you in advance. Semper Fi, Kevin
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Lee
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Post by Lee on Dec 13, 2022 20:10:11 GMT -5
You say “Main Shaft”, Photo shows a “Countershaft”….. So witch one is it ?.
Lee😉
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Post by Scoutpilot on Dec 14, 2022 4:18:31 GMT -5
My bad. I specialize in timely fuel/air delivery, not trannys. I led him to main shaft. This is why I urged him to ask his question here.
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oilleaker1
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Post by oilleaker1 on Dec 14, 2022 7:30:11 GMT -5
The original Willys Overland assembled transmissions and engines had a front bearing retainer gasket that actually covered the countershaft when bolted to the bell housing. Now it's just the retainer cover only. If you clean the depression in front of the countershaft with brake clean, dry it, and smear a sealer like Permatex Ultra Black there and let dry, it will help stop most of the leak. When bolted to the bell housing, it's not accessible. Some guys will put some sealant in the hole and then tap the shaft forward while installing the rear lockplate between the idler and counter shaft. Same idea only better. Anarobic sealant that will set up in the absence of oxygen. I do not own a Willys Jeep with a t90 that doesn't seep/leak. When you spin the gear set you get internal pressure. That tends to find a exit somewhere. The output seals on the transfercase, speedometer cable drive, drain plugs, bottom cover gasket, rear cover gasket, top shifter cover, shifter rail bores, input shaft felt seal, on and on. You learn to live with it. As long as it isn't "A Appreciable Amount'.
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Lee
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Posts: 642
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Post by Lee on Dec 14, 2022 7:36:59 GMT -5
No worries, the countershaft is installed from the rear of the transmission, the front bore in the photo has a slight taper in it and as the shaft is installed it tightens up sealing the end of the shaft. I’m no expert on these but if oil leaks from the end, either the bore or shaft must have an issue ?. Have you contacted the rebuilder for their opinion on the issue ?….
Lee😉
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Post by 1stsgtusmc on Dec 14, 2022 14:14:16 GMT -5
Oilleaker,
Thanks for the explaination. I bought some rubber/ fiber material to make a gasket from the big box parts store and some aviation permatex gasket maker....do you recommend that over the paper gasket material and should I use The Right Stuff from permetex insted? Sorry for all the questions...just trying to do this right the first time.
Kevin
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Post by brucew on Dec 14, 2022 15:54:46 GMT -5
One of the few places where you might catch me using a bit of silicone. A bit around the end of the shaft and in the bore before the transmission is pushed up against the bell housing. BW
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Post by 1stsgtusmc on Dec 14, 2022 17:06:26 GMT -5
What type did you use?
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Post by brucew on Dec 14, 2022 19:30:26 GMT -5
Whatever I find in the toolbox. BW
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Post by 1stsgtusmc on Dec 14, 2022 19:54:07 GMT -5
The original Willys Overland assembled transmissions and engines had a front bearing retainer gasket that actually covered the countershaft when bolted to the bell housing. Now it's just the retainer cover only. If you clean the depression in front of the countershaft with brake clean, dry it, and smear a sealer like Permatex Ultra Black there and let dry, it will help stop most of the leak. When bolted to the bell housing, it's not accessible. Some guys will put some sealant in the hole and then tap the shaft forward while installing the rear lockplate between the idler and counter shaft. Same idea only better. Anarobic sealant that will set up in the absence of oxygen. I do not own a Willys Jeep with a t90 that doesn't seep/leak. When you spin the gear set you get internal pressure. That tends to find a exit somewhere. The output seals on the transfercase, speedometer cable drive, drain plugs, bottom cover gasket, rear cover gasket, top shifter cover, shifter rail bores, input shaft felt seal, on and on. You learn to live with it. As long as it isn't "A Appreciable Amount'. Oilleaker, Thanks for the explaination. I bought some rubber/ fiber material to make a gasket from the big box parts store and some aviation permatex gasket maker....do you recommend that over the paper gasket material and should I use The Right Stuff from permetex insted? Sorry for all the questions...just trying to do this right the first time. Kevin
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oilleaker1
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Post by oilleaker1 on Dec 15, 2022 8:38:19 GMT -5
Permatex ultra black is fine.
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Post by 1stsgtusmc on Dec 15, 2022 8:42:26 GMT -5
regarding the seal/gasket for the bell housing material.....do you recomend the paper or the rubber/ fiber material?
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oilleaker1
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Post by oilleaker1 on Dec 16, 2022 6:31:57 GMT -5
None of the current kits I've seen come with a full gasket that goes under the bearing retainer. It may have been a M38 waterproof thing. Not sure. I don't make/use a full front gasket. I just smear the pocket in front of the countershaft. The rear mainseal whether rope or lip, will seep also. If you can't live with a drip there, you will drive yourself to madness trying to stop all leaks. GL1 90 weight gear oil is yellow metal safe. Some of the GL4/5 gear oils will dissolve your brass blocking rings in the transmission. If it says safe for brass components, then they are supposedly fine. You will want to run magnetic drain plugs in both the transmission and transfercase.
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Post by 1stsgtusmc on Dec 16, 2022 9:12:06 GMT -5
Thank you Sir! Not looking for perfection, just trying to prevent more than a seaping oil leak. I made a bellhousing gasket out of the rubber/fiber gasket material they sell at the autoparts store. I will apply airplane gasket sealer to the countershaft and then to the gasket and re assemble for added protection. I really appreciate the guidence, Mr Rick speaks highly of you. Have a Merry Christmas and God Bless!
Kevin
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oilleaker1
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Post by oilleaker1 on Dec 16, 2022 17:09:26 GMT -5
You're welcome. I'm just a Jeep owner enthusiast. Since I was 13. Now 68. I'll never be without one. Might seem wierd, but a Jeep is like socks, or a hat. I like having one available. Once out on the trail, it feels right. If driving a car and I see a trail leading off into the beautiful back country, I miss my Jeep. Oilly
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