Modern replacement for a late Series 3 petrol starter motor.

Rangieman123 · Sunday at 19:07

Hi All,

I'm assisting work on the restoration of a Series 2A, fitted with a later 5mb Series 3 petrol engine.
In an effort for better reliability I want to fit a more modern geared pre engaged starter motor.
Can anyone confirm I can fit a starter off a 2.5 90, or indeed suggest a better starter? Diesel 90?
I want to do this while the wings are off and I can easily alter the wiring loom. Thanks.

Wildefalcon · Sunday at 20:54

I think, fairly certain, the 2.5 has a different ring gear. So that's out.

grewth · 2025-01-06T00:45:13+0000

Something at the back of my memory is suggesting that it's the same ring gear but fitted the other way around.
Not 100% certain on that but I'm pretty confident you could fit a diesel flywheel to the petrol crankshaft, along with a diesel type engine block bellhousing.
Then you could fit a 200Tdi type starter motor.
A lot of work just to avoid an inertia type starter motor. but maybe not if the engine is already out of the vehicle, and you have the relevant bits to hand.

Jacksprat · 2025-01-06T15:45:36+0000

After my starter packed in I replaced it with one from Powerlite - https://www.powerlite-units.com/ - which is brilliant (not cheap). Fitting is a matter of minutes but you might want to call them and find out which one they recommend as I suppose depends what gearbox?

steve2286w · 2025-01-06T16:07:01+0000

The 200tdi starter fits the S3 5mb engine , but

the petrol flywheel not the same as diesel, if you’re going for replacement go for a good branded make

2.5 Petrol fits according to this

PRC 6613N Starter Motor Magneti Mirelli 2.5 Petrol

PRC 6613N Starter motor suitable for 90/110 2.25 and 2.5 Petrol. Magneti Marelli high quality original part

www.turnerengineering.co.uk

Modern replacement for a late Series 3 petrol starter motor.

Rangieman123

Well-Known Member

Wildefalcon

Well-Known Member

grewth

Active Member

Jacksprat

Member

steve2286w

Well-Known Member

PRC 6613N Starter Motor Magneti Mirelli 2.5 Petrol

Similar threads