Engine cranks slow after hot

  • ilikescars
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10 Aug 2010 14:28 #17546 by ilikescars
ilikescars created the topic: Engine cranks slow after hot
Hi: I have a small problem with my 851 '35 cabriolet: If I drive the car for awhile and shut it off for a minute, it has a tendency to crank very slowly before starting again. (I have adjusted the timing correctly.)
I read some posts on other websites that suggest that the starter motor is getting overheated from engine heat and causing it to lose cranking ability.
Or maybe I should have the starter gone through by a rebuild shop?

Any suggestions?

Mark

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10 Aug 2010 22:35 #17554 by
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Put a parallel induction ammeter (600 amp) along the battery cable and crank it. If it pegs the ammeter, re-build the starter. This is not 100 %, but close enough to warrant doing it.

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  • mikespeed35
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11 Aug 2010 01:51 #17557 by mikespeed35
mikespeed35 replied the topic:
I presume you have heavy battery and startex cables? Positive to frame and then frame to starter?
CORDially Mike

Mike Huffman

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  • Josh Malks
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11 Aug 2010 13:27 #17559 by Josh Malks
Josh Malks replied the topic:
To supplement Mike's response, battery cables should be 00 welding cable with professionally crimped (not hobbyist soldered) terminals. Ground cable (not strap) should run from battery terminal to one of the mounting bolts on the starter.

Use an Optima battery.

Do have the starter checked by a competent shop. Worn bushings will permit the armature to move closer to the field coils as it rotates which will cause drag.

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11 Aug 2010 13:28 #17560 by ilikescars
ilikescars replied the topic:
Mike; Yes, everything is correct. I have a feeling that there is a poor ground inside the starter motor. I discovered that problem in another starter that I have.

Bill: I don't have the testing device that you mentioned, but I will try to borrow one...

Mark

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11 Aug 2010 13:32 #17562 by ilikescars
ilikescars replied the topic:
Josh: The ground is a braided strap, same as factory. I even used dielectric grease on the contact points. Thanks for the info.

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