I took the plunge and ordered a pre-engaged starter from heritage MG today.

It has the solenoid attached to it, now how do I wire the sucker in?

Do I bin the other solenoid all together (preferred)?

What do I do with the battery lead?
What about all of the other wires on the old solenoid??

Please help and use small words. Assume nothing, I am a wiring novice!!!

Cheers
Matt

Bin the old solenoid
You will need to extend the cable from the battery by about 300mm to reach the new starter, or better still replace the cable with a longer one - the less joins in the cable the better. Measure twice - cut once.
You may find that the other smaller wires can reach the new starter without extending them, otherwise lengthen them as required.

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Curly
'64 Cooper 'S' (Group Nb spec)
'67 Mini Marcos GT www.mm7056.wordpress.com

I have already got a new battery cable, I got it made up about 400mm longer than standard to allow for this mod.

So I just connect the wires to the new solenoid exactly the same as on the old solenoid?
Is there a difference between the terminals on the old solenoid? Or are they just spaced out for convenience?

The new solenoid will have two terminals, what is the difference between the two????

Cheers Matt

Excuse the ignorance but I have asked this question before and not recieved an answer. What is a pre-engages starter motor and what are the advantages of one??

Thanks

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Bob Slattery
Duffman Says A Lot of Things - OH YEAH!!

[quote="MrBob"]Excuse the ignorance but I have asked this question before and not recieved an answer. What is a pre-engages starter motor and what are the advantages of one??







Pre engage starter has higher torque then the standard one which uses the armiture to engage the ring gear.
The pre engage starter uses the solinode on the starter.
Hope this helps.

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I swerve and hit people at random.

So basically just like a normal car starter motor.
Cool - is there much modification required to do this??

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Bob Slattery
Duffman Says A Lot of Things - OH YEAH!!

Yes, its exactly the same as in a modern car, only mods you need to do is the ring gear and wiring, because pre engaged starter requires more teeth on the ring gear to take advantage of the higher torque.

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I swerve and hit people at random.

Isn't the ring gear part of the flywheel?

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Bob Slattery
Duffman Says A Lot of Things - OH YEAH!!

Yes Ring gear is part of the Flywheel it needs to be heated for the ring gear to be removed.
Changing the ring gear is not essential IMO changing to pre engaged without changing ring gearis a waste of time because motor will turn over at the same revolutions as old starter motor gaining nothing, I'm sure some one will correct me if I'm wrong.

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I swerve and hit people at random.

A BIG advantage is that the pre-engaged starter won't disengage (with an annoying whining sound ) as soon as even one spark plug fires, like the old lucas one I have.

It will provide a lot easier starting because of this, as well as it being higher torque. The higher torque doesn't depend on the ring gear to have more teeth, it is the capability of the motor to spin faster as long as there is enough power to it. Hence the 550cca exide i have in the boot

Now, back to MY topic

What do I do with the wiring????

Matt

Unless someome has changed the wiring the largest terminal will be the starter switch wire and all the rest piggyback to the main battery terminal.
The starter switch terminal on the solinoid should be the larger of the two and be by its self on the solinode.
You may need to change the terminals from the blade type to round ones.
ps pr engaged starter ring gear 129 teeth.and standard has 107 I was always under the understanding that the pr engaged would not engage prperly on 107 teeth.
You learn somthing new every day.

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I swerve and hit people at random.

Thanks,

& the pre-engaged off of a mini will not fit the inertia ring gear properly!

The pre-engaged I've ordered will

Cheers
Matt

Yeap, the Heritage MG Revolution starter requires no modification to the ring gear to mesh correctly..

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Starlet Conversion:
http://www.ausmini.com/forums/viewtopic.php?t=15484

The pre-engaged type off a Gemini doesn't need the ring gear changed either. It easily spins the engine over a good 100 - 200rpm faster than the Lucas.

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Curly
'64 Cooper 'S' (Group Nb spec)
'67 Mini Marcos GT www.mm7056.wordpress.com

MMMM looks like I went the long way around.

_________________
I swerve and hit people at random.