948cc Starter motor. 10 tooth or 9 tooth?

[Hunsta]

Gday all. Just trying to buy a new starter motor for the new 948cc motor I have. Now I had a couple given to me But one is a 9tooth and the other is a 10 tooth. Manual says it should be a M35G. But doesnt say how many teeth.
Ive found a couple on fleabay.
One is an M35G
https://www.ebay.com.au/itm/STARTER-MOT ... 2630743908

and the other says its an M35
https://www.ebay.com.au/itm/M35-STARTER ... 1438.l2649
Both say suit morris, but that later has a fitment list that doesnt say Morris minor.
So which one is the one I should get
Cheers
Craig

[geoberni]

From what I know, which isn't much as I'm pretty new at this Moggie ownership lark, I think 9 tooth is the normal, but it will ultimately depend on the number of teeth on the flywheel.
All the ones I've seen advertised over here, if they mention the teeth, say 9, and ESM even sell some parts including a 9 tooth bendix.
http://www.morrisminorspares.com/electr ... 10-p829699
I'm sure someone far more knowledgeable will contribute.
You might want to have a look at old Starter Motor topics, such as this one: viewtopic.php?t=51279

[philthehill]

Strangely enough both 9 & 10 tooth Bendix starters will fit the Minor without any problems.

[Myrtles Man]

Would the 10% lower gearing of the 9-toother provide a bit more grunt to get the engine spinning when it's minus ten outside? Difficult to imagine such weather conditions at the moment but they will surely return.

[philthehill]

It may do but I would not count on it.
The Bendix to flywheel relationship is a bit crude to say the least and that is why either the 9 or 10 teeth Bendix will mesh with the flywheel.
There is no precision engineering in the relationship.

[Hunsta]

Strangely enough both 9 & 10 tooth Bendix starters will fit the Minor without any problems.

OK Thanks for that guys. I`ll go with the 9 tooth. Mainly because its cheaper and that appeals to my thrifty Scottish heritage
Cheers
Craig

[geoberni]

Would the 10% lower gearing of the 9-toother provide a bit more grunt to get the engine spinning when it's minus ten outside? Difficult to imagine such weather conditions at the moment but they will surely return.

You didn't notice he's using Australian ebay then..... Not many places out there to find minus 10...

[Myrtles Man]

Er, no, but it wasn't intended as any sort of recommendation, more a piece of philosophical musing on why both nine and ten tooth Bendixes (Bendices?) might have been made available.

[philthehill]

https://en.wikipedia.org/wiki/Bendix_drive

[geoberni]

Er, no, but it wasn't intended as any sort of recommendation, more a piece of philosophical musing on why both nine and ten tooth Bendixes (Bendices?) might have been made available.

I think because the engines have been used in multiple applications, such as the link I posted earlier about starters
viewtopic.php?t=51279

Plus of course, that starter would probably have many more applications that just BMC/Minor engines...

[Myrtles Man]

'97 tooth flywheel needs 10-tooth Bendix gear.

9-tooth is used w/124 & 129 tooth flywheel gears.'

From the American Bantam Car forum. Sound convincing? Or is it mere dogma?

[philthehill]

The MG midget with the same flywheel and the same starter motor (Lucas 25149) can be fitted with either the 9 tooth Bendix pinion Pt No: 67H5010 (MOSS) or the 10 tooth Bendix pinion Pt No: BAU5781 (MOSS).
The Minor can be fitted with the same starter and either Bendix.
Because of the wide engineering tolerances either will fit and can be used on a Minor 1000 (948cc and 1098cc).
So you could say it is partially dogma.
I just use what I have and what works which may be either

[IslipMinor]

I can confirm that both 9T and 10T starters work on an A-Series engine. 15+ years ago I had to replace the starter on our 1380 (1275 Midget) engine, and the new one from the local Lucas agent came with 10T. The old one had 9T, and when I queried it, they said that all A-Series can be either 9 or 10T. Worked fine, and cranked the engine over noticeably faster, but I do have a 65AH battery with 550 CCA (Cold Cranking Amps), which is around double the standard 038 battery CCA.

Last year I had to replace the starter again, and this time it came with 9T.

[Hunsta]

Well I bought the 9 tooth. As for the -10 degrees. No not a lot of that around here. Our mid winter days can be around 25C. And we do get the odd -2 late July.
thanks once again