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Primary Gear Bush Lubrication?


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#1 unburntfuelinthemorning

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Posted 01 August 2019 - 07:19 PM

Does the Deva type primary gear bush require any initial lubrication upon fitting from new or is it installed completely dry?


Edited by unburntfuelinthemorning, 05 August 2019 - 07:31 AM.


#2 imack

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Posted 01 August 2019 - 07:53 PM

I was always told to leave them in an oil bath for a few days prior to fitting. Don't know for certain if it's the right thing to do or if it did any good, never had a problem with one though.

#3 Moke Spider

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Posted 01 August 2019 - 08:19 PM

I have done as Imack suggests with new bushes, though a heated (~800C) for a minimum 4 hours with new bushes. If they have been used previously, I don't bother.

 

After the Hot Oil bath I allow the gear to stand for a few days for any excess oil to run off, but don't degrease it. When fitting up, a smear of engine Oil on the tail of the crank.

 

I then fit up the Transfer Housing and the seal in to it. It is at this point I degrease the Oil from the splines and all external parts of the Primary Gear.

 

If re-fitting after this initial fitting, I only give the tail of the Crank a smear of engine Oil.

 

This only works with the Original Deva Bushed Gears.



#4 unburntfuelinthemorning

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Posted 01 August 2019 - 09:10 PM

Did the factory engines have their bushes soaked in this manner?



#5 Retroman

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Posted 03 August 2019 - 08:32 PM

Not sure what the did in the factory but Spiders advice is good.

 

If you don't lubricate the new bush it will seize on the crank



#6 unburntfuelinthemorning

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Posted 03 August 2019 - 09:02 PM

Fair enough, seems reasonable.  Pity the Haynes manuals didn't bother mentioning it.



#7 Moke Spider

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Posted 03 August 2019 - 09:15 PM

I'm not sure either, what they did in the factory with these.

 

A former employer, who originally worked in the technical area of Borg Warner Transmissions explained this to me and it's what I've done since.

 

I think you might be able to get away without it, but by doing this, any pours in the material will open and accept the oil, on cooling, some will be expelled, but some is retained. It will result in a long life from it.



#8 unburntfuelinthemorning

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Posted 03 August 2019 - 09:26 PM

And there's no chance of any of the oil getting on the clutch?



#9 Retroman

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Posted 03 August 2019 - 09:27 PM

I tried a new gear without hot oil bath....

 

When you drive and press the clutch its like hard left foot braking...nearly puts you throught the bloody windscreen...

 

I only tried it once and didn't like it

 

Clean it as per Spider, no oil on clutch.



#10 unburntfuelinthemorning

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Posted 04 August 2019 - 06:51 AM

Just need the wife to be out for four hours now then!



#11 DeadSquare

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Posted 04 August 2019 - 08:16 AM

Did the factory engines have their bushes soaked in this manner?

 

There would have been no point in using this material for the bush, if it were not correctly treated at the factory.

 

I am old enough to have experienced the problem of the first production, lubricated bush.  The oil bathed clutch damaged the Mini's reputation, and BMC could not have afforded to go for only 1/2 a fix.



#12 ACDodd

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Posted 04 August 2019 - 09:42 AM

I do alot of primary gear re bushing for customers including the mini trade using the bushes that are available now. I use my own lube formulation and also make my own bushes for the small bore type gears.

Edited by ACDodd, 04 August 2019 - 09:45 AM.


#13 ACDodd

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Posted 04 August 2019 - 09:53 AM

I do alot of primary gear re bushing for customers including the mini trade using the bushes that are available now. I use my own lube formulation and also make my own bushes for the small bore type gears.

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Edited by ACDodd, 04 August 2019 - 12:43 PM.


#14 unburntfuelinthemorning

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Posted 04 August 2019 - 11:11 AM

 

Did the factory engines have their bushes soaked in this manner?

 

There would have been no point in using this material for the bush, if it were not correctly treated at the factory.

 

Do you mean, correctly treated at the factory which made the bush/primary gear or correctly treated at the factory where the primary gear was placed onto the crankshaft?



#15 unburntfuelinthemorning

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Posted 04 August 2019 - 11:13 AM

I do alot of primary gear re bushing for customers including the mini trade using the bushes that are available now. I use my own lube formulation and also make my own bushes for the small bore type gears.

That's lovely.  How does that relate to the Deva bush?






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