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Re: 4 speed box on a 1929 coil engine...

I made sure the 4 speed filler plug was tight and left the floor as was, checking the oil level and filling via the gear lever hole like the 3 speed.

Re: 4 speed box on a 1929 coil engine...

Ruairidh, I recommend that you contact Andrew Jarmin or Malcolm Watts of the Cornwall A7Club. They have done this conversion to more than a few three speed A7s due to the 'Cornish Alps' hindering upward progress. Everyone who has had the conversion done locally (including me) would not go back even though missing clutchless gear changes and melodic sounds coming from the gearbox. Far better than the sounds from the driver stuck on a one in 'very little' local hill, and that's if somewhere can be found to turn and go up in reverse.
All the best,
Peter
Sunny Cornwall

Re: 4 speed box on a 1929 coil engine...

For the 4 speed box I cut off the boss holding the gearlever and rewelded it back on the gearbox top further towards the driver's side and cranked the internal bit of the gearlever. Filed down the gearbox top enough to allow the 1930 to 1932 rearward facing starter motor and housing to fit on. This was 25 years ago and so I forget the finer detail. It still works ok. I did this to make it look slightly more authentic for my ulster replica and also because the bacon slicer starter creation should have been left at the meat factory where it belongs.
Dave.

Location: Sheffield

Re: 4 speed box on a 1929 coil engine...

Thank you everybody - here and off-line - who contacted me. I am very grateful for all your experience and advice, it is very helpful.

Re: 4 speed box on a 1929 coil engine...

Just one more mod you will probably want to do. Change the brass spiral drive from a 3 speed box to the 4 speed box--it is held in drive by the drive flange , or the 3 arm flex drive boss on the early 4 speed. I think there is a slight mod to do to the brass spiral (I did this many years ago). you will then have the correct ratio for the PA speedo.

Re: 4 speed box on a 1929 coil engine...

Thank you Ken.

Re: 4 speed box on a 1929 coil engine...

Not sure of the value of mousetrap springs. I use a 3 speed box with 1925 engine & have a 4 speed release bearing and the later clutch fingers. No mousetraps, no problem.

Re: 4 speed box on a 1929 coil engine...

Ruairidh

I have thi 4 speed arrangement on 1932 car detail on the DA7C website. Which should apply to a 1929 A7.

http://www.da7c.co.uk/technical_torque_articles/3_to_4speed_gearbox_conversion.htm

Douglas

Re: 4 speed box on a 1929 coil engine...

Thank you Douglas and Charles.