The copper windings in the starter increase their resistance as the starter
gets warm. Without looking it up, I'll guess that the increase is around 3%
per 10 degrees C, so if you have a starter that is at, say 212F (100C), it's
resistance is perhaps as much as 50% higher than at cold start. This means
that the torque of the starter is reduced by 50% at the same time as all the
engine clearances are tightened up by the high temperature. If in addition
to this your timing is set for maximum performance and economy, there is a
push back against the starter from each cylinder just before TDC, so you
have a chain of events that can really stack up to trouble. The way to
verify your starter's condition is to monitor how much current it is drawing
at stall, which usually is only done on the test bench, but you can look at
the draw during cranking, and compare that with the starter spec, (which
should be in your FSM) for a rough test. If the current draw is very high,
there is a starter failure in your future.
Dick Benjamin
----- Original Message -----
From: Philippe COURANT <accf_clb@xxxxxxxxxxxxxxxx>
To: <mailing-list@xxxxxxxxxxxxxxxx>
Sent: Monday, April 29, 2002 2:50 AM
Subject: Re: IML: (heavy) hot starter
> I've also the same problem on my car ! When the engine is (very)
> hot, after some hard driving, the starter has difficulty to crank
> the engine: it's as if the battery was low, there are
> hesitations.
> But the battery is well charged and this occurs only when engine
> is hot.
>
> Do you think that i've a weak starter motor ? What's happen in
> the starter when the engine is hot ?
>
> I've seen in the Parts List that ther's was a "starter heat
> shield" (written: "when used") # 1558 394. Only for Chrysler and
> Imperial with 392. Does someone know what is this part and what
> is its shape ?
>
> --
> Philippe COURANT (Pau, France)
> Imperial 57 Crown convertible
> Buick 58 Roadmaster sedan
>
> - American Car Club de France (ACCF) : http://www.accf.com
>
> - Chrysler Imperial France : http://www.ifrance.com/c-i-f
>
> - Cadillac " Standard of Excellence " :
> http://www.ifrance.com/accf-cad
>
> - SportsCars : http://www.ifrance.com/accf-sprtcar
>
>
>
>
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