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Austinsevenfriends
Starter Motor not Engaging - Advice Please - Printable Version

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RE: Starter Motor not Engaging - Advice Please - John P - 07-06-2020

Ivor,

Not sure if you've already done this bit I was amazed how poorly the new brushes I fitted matched the curvature of the commutator.   

I hadn't noticed this until I completely removed the armature from the motor body and then fitted just the brush end plate onto the armature spindle and had a look.   

Although the radius on the brushes was probably correct, because the brush holder swings in an arc the commutator was actually only bearing on a very narrow land across the width of the brush.    Using a strip of abrasive paper curved around the commutator and pulling it back and forth under the pressure of the brush I effectively re-formed the curve until it mated much better.

When I powered the re-assembled motor with jump leads the spark as I made contact was much more pronounced than previously, presumably because the motor was now drawing more current.

Anyway, it was after this that it seemed to work OK so if you've not done so it may be worth a try.

Incidentally, many years ago when I was an apprentice I was told it was best to use sand paper rather than emery on brass or bronze bearing surfaces as otherwise the abrasive can become embedded in the surface.   Not sure how true this is but the old fitter who passed it on was very experienced.

John.

RE: Starter Motor not Engaging - Advice Please - Ivor Hawkins - 07-06-2020

Thanks John, yes your old engineer was correct! I wrapped the freshly skimmed commutator in a strip of 150 wetordry and gave it a spin with the windy gun, while holding the brushes against the commutator, so I think I have a good connection but I will double check!

RE: Starter Motor not Engaging - Advice Please - jpsmit - 08-06-2020

I realize I am saying the obvious but is the engine well grounded?