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Nick B.

Mating new gearbox to used overdrive

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Hi

 

After the 10CR, I decided my 3-reail D-type ODgearbox needed some service. The syncro on 3rd gear are worn, and the change is not smooth, but requires a bit of fettling - or brutality.

I have a complete rubuild OD-gearbox I bought from GT a few years ago, and now want to put the thing into service.

Question is - is it straight forward to remove OD-unit from the old gearbox and put it onto the new box? Any traps to look out for?

 

 

Cheers

Nick

 

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Should be pretty straight forward.  Make sure the pump drive cam and it's retaining wire clip are there on the new box - and swap them across if not.  Resist the urge to twiddle the output flange while the OD is off.  There are two sets of splines inside the OD and they have to line up exactly for the OD to go fully home.  They come out of line MUCH easier than they go back into line.

Obviously it's worth dropping the sump on the OD and cleaning the magnets and filter.

Nick

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On 9/11/2017 at 9:37 PM, Nick Jones said:

Should be pretty straight forward.  Make sure the pump drive cam and it's retaining wire clip are there on the new box - and swap them across if not.  Resist the urge to twiddle the output flange while the OD is off.  There are two sets of splines inside the OD and they have to line up exactly for the OD to go fully home.  They come out of line MUCH easier than they go back into line.

Obviously it's worth dropping the sump on the OD and cleaning the magnets and filter.

Nick

Hi Nick

 

Thank you. It is assuring to know that things does not explode on the workbench when I take them apart. I really must resist the urge to twiddle the flange. I most certainly would have done it if I had not been warned. The Mad Welder kan confirm I am quite a fiddler who never leaves stuff untouched.

 

The new gearbox is one I bought from GT a few years ago, and I judge it is a good time to put it into service. Hopefully it will last better than the old one, where the new china-made syncros on third gear really is not up to the job.

And most definitely the magnets and filters will be cleaned. As you perhaps remember from 10CR my OD decided to retire itself from service about 5 hours after start. I suggest an electrical error though. It has always been a nice shifter without hesitation. Less than 1.5 seconds to engage, and instant disengagement.

 

Cheers

Nick

 

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I can relate to fiddling...... quite alot of my knowledge comes from being forced to find out how to fix what I accidentally broke....

Gareth knows how to build a decent gearbox.

Nick

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