transmission rebuild: assymbly grease vs oil

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dhosh
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transmission rebuild: assymbly grease vs oil

Post by dhosh » Mon Sep 07, 2020 12:14 am

Wjen reassembling a transmission after a rebuild, is it just personal preference to use oil vs assembly grease or bearing saver on the bushings and mating surfaces? Maybe potential long sit time for he parts warrants a smear of grease?
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Alan Long
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Re: transmission rebuild: assymbly grease vs oil

Post by Alan Long » Mon Sep 07, 2020 8:54 am

I have only ever used Engine or Auto Trans oil when assembling a transmission. Just my preference really as I then fill the engine with oil via the transmission inspection cover to give it another dose just before start up.
I would hate to have a Triple Gear Bush (or other) seize because grease wasn’t up to the lubrication qualities and / or
blocked oil entering the critical areas. I have no evidence to support either theory
Alan in Western Australia
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Topic author
dhosh
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Re: transmission rebuild: assymbly grease vs oil

Post by dhosh » Mon Sep 07, 2020 9:22 am

Alan...

I kinda wondered the same about the grease potentially clothing the oil groves in the bushings. I have engine build lube, but think I'll stick with the oil in my oil can. :-) thanks!
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RajoRacer
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Re: transmission rebuild: assymbly grease vs oil

Post by RajoRacer » Mon Sep 07, 2020 11:05 am

Use the same oil you intend to run in your engine !
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RGould1910
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Re: transmission rebuild: assymbly grease vs oil

Post by RGould1910 » Mon Sep 07, 2020 11:19 pm

If the rebuild might sit a while I mixed STP with engine oil
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Steve Jelf
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Re: transmission rebuild: assymbly grease vs oil

Post by Steve Jelf » Mon Sep 07, 2020 11:31 pm

I've seen 60W oil used.
The inevitable often happens.
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Mark Gregush
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Re: transmission rebuild: assymbly grease vs oil

Post by Mark Gregush » Tue Sep 08, 2020 1:00 pm

Cars that have been sitting for years are started with just the oil (ok maybe after an oil change) that is in them. Of course they are a little looser from wear. ;) While a lite grease may be ok, stay away from the white stuff. It tends to cake up from sitting a while and is hard to wash out. I use heavy oil or same as what will be going into engine.
I know the voices aren't real but damn they have some good ideas! :shock:

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fbergski
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Re: transmission rebuild: assymbly grease vs oil

Post by fbergski » Tue Sep 08, 2020 1:50 pm

In my teen years I worked at a auto transmission rebuilding shop and we'd use grease on seals and transmission oil on bushings/clutch plates. We'd build up an inventory of transmissions so some would sit for a few months before use, never an issue.
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Mark Gregush
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Re: transmission rebuild: assymbly grease vs oil

Post by Mark Gregush » Tue Sep 08, 2020 2:18 pm

Too add; I have seen photos of engines that were rusted up hunks of scrap iron that had been sitting for years out in the weather, when pulled down still had signs of oil in the crank and rods.
I know the voices aren't real but damn they have some good ideas! :shock:

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Topic author
dhosh
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Re: transmission rebuild: assymbly grease vs oil

Post by dhosh » Tue Sep 08, 2020 8:36 pm

As this will 'hopefully' just be a week or two before it's assymbled and installed on the car, I'll just go with regular or transmission fluid so everything has a smear of oil.

Thanks, all!
'24 RPU
Petoskey, Mi
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