Hmmn. Very interesting indeed. My 4 is an early one and the starter looks
just like my TR3As. I never heard of the starter stopping as engine fires. My
3 keeps cranking as long as I push the button. Jim
Sent from my iPhone
> On Jan 22, 2019, at 10:31 AM, Randall <tr3driver@ca.rr.com> wrote:
>
> Except that the rubber coupling was eliminated during the TR3A; a TR4
> shouldn't have one.
>
> But you bring up a very good point. The TR4 still uses a Bendix, which
> automatically disengages the starter when the engine fires. If the engine
> fires once but doesn't start, the starter is disengaged and wont engage
> again until you let off the key (or button on a TR3) and let it stop
> spinning.
>
> Perhaps what Jim is hearing is the hum of the starter motor spinning
> uselessly after the Bendix has kicked out.
>
> In that case, he needs a tune-up rather than a starter rebuild. It's just
> the nature of the beast. Eliminating that "feature" was one of the best
> benefits from going to a gear drive starter IMO. (The gear drive starters
> use a solenoid and an overrunning clutch rather than a Bendix, so if the
> engine fires but doesn't start, they just go back to cranking.)
>
> -- Randall
>
>> My guess is the hum is the rubber coupling in the starter
>> pawl is slipping. Time for rebuild.
>>
>
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