Page 1 of 1
Speedometer drive pinions
Posted: Sun May 05, 2019 10:36 pm
by ndevans
Are speedometer drive pinions the same on Minors, Midgets, Sprites etc? Do the ratios differ for different rear diff ratios?
Cheers N
Re: Speedometer drive pinions
Posted: Mon May 06, 2019 8:37 am
by philthehill
Looking at and extracted from the MOSS parts lists they are all the same.
Morris 948cc - 1098cc...………..Pt No: 2A3420.
MG Midget 948cc - 1098cc......Pt No: 2A3420.
MG Midget 1275cc...…………….Pt No: 2A3420.
Do not loose or damage the pinion as it is listed at £156.00 plus the usual.
Re: Speedometer drive pinions
Posted: Mon May 06, 2019 10:17 am
by ndevans
No, haven't lost it, I was just pondering that if the pinions were different for different back axle ratios, it would be an easy way to re-calibrate the speedo for a 3.9:1 diff. Obviously not!
Cheers N
Re: Speedometer drive pinions
Posted: Mon May 06, 2019 10:30 am
by liammonty
The only one that I’m aware of being different is the one fitted to the Series II gearbox (on the 803cc engine, usually combined with a 5.375:1 final drive), which has a different number of teeth. As such, this drive pinion isn’t interchangeable with other Minor gearboxes due to the drive gear on the 3rd motion shaft also being different.