P6 starter motors.

B

BobTaylor

Member
HI, this is my first post on the site as a new member. I have just got a 1972 P6 2000 which has a 'A' suffix on the chassis number. It is fitted with what seems a inertia starter, but came with some spares including a prengaged starter.
Are they interchangeable? I recently fitted a prengaged on an MGB in place of an inertia style star as a straight swap without any problems.
Any advice would be welcome.
Bob
 
Inertia and pre-engaged starters engage from opposite directions, so the bevels on the ring gear would be on the wrong side.
 
A 1972 car should have the pre engaged starter motor. Some ring gears had a lead on both sides. Check to see if you have a lead on the engine side, if so you can fit the pre engaged starter.
 
The car has a separate solenoid, so I assumed it was not a pre gaged starter as they have the solenoid on the starter, is that right? If so looks like a M418g starter going in the for sale bin.
 
BobTaylor said:
The car has a separate solenoid, so I assumed it was not a pre gaged starter as they have the solenoid on the starter, is that right?
Click to expand...

Correct. Maybe someone has fitted an early engine and had to use the early starter motor, or they've just fitted it because it was available.
 
It is the original engine. Can you explain again how I can check to see if the engine will accept both types, sorry to be a pain,
Bob
 
There is a bevel (lead) on the ring gear teeth, if that bevel is on the engine side it is suitable for a pre engaged starter motor.
 
Thanks for the reply Harvey, I see you have also answered about my clutch, thanks.
I got quite a lot of spares with the car, the previous owner had 3 p6 2000 cars, my k reg, an L reg and another. I guess he collected bits for all the cars, hence my enquiries. Fortunately I think most spares fit all 2000 cars around that era.
Bob
 
Whilst on the subject of starters:- my first car , a 1976 model has a starter that seems like every other starter that I have used on cars over time.
my second, recently acquired car ,also a 1976 model, about 2 months later down the line... has a different sounding starter motor....it spins the engine very fast compared
with the first car?
Why is this so?

Peter
 
ButterFingers said:
Whilst on the subject of starters:- my first car , a 1976 model has a starter that seems like every other starter that I have used on cars over time.
my second, recently acquired car ,also a 1976 model, about 2 months later down the line... has a different sounding starter motor....it spins the engine very fast compared
with the first car?
Why is this so?

Peter
Click to expand...
One could be a m418 starter, the other might be a m45, or a 2M100 starter. There are a number of different starters which can work, and I believe there was a tsb for a substitution for a stronger starter if replacement was needed.

Other things to look at are the wires, the age of the battery. By 1976 compressions were all the same, so different compression ratio pistons should not be an issue. Have you checked the engine numbers, are they original? You can drop in a 2000 motor and use a 2200 cam cover, and no one would know without checking the engine number. Weight of the oil can make a difference as well.
 
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