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1953 M38A1 Front Seat Springs wanted
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Starter Issue

 
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UncleSam
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Joined: Aug 08, 2017
Posts: 8

PostPosted: Fri Dec 07, 2018 4:21 pm    Post subject: Starter Issue Reply with quote

- 1953 M38A1
- I've uploaded a picture of the starter, I don't know what kind of starter it is (it may not be the correct one)

- The issue: About 3 out of 4 starts, the starter spins and doesn't engage, nor does it make any bad sounds. Just spins.

- The bendix throws the gear out every time. The bendix has to be thrown out to trigger the solenoid...and I can see it get thrown out when I turn the key
- Why is it not engaging? Worn gear? Is it possible for it to be thrown out enough to trigger the solenoid, but not engage?



Last edited by UncleSam on Tue Dec 11, 2018 8:41 am; edited 1 time in total
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wesk
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PostPosted: Fri Dec 07, 2018 11:11 pm    Post subject: Reply with quote

Definitely not the correct starter for your M38A1.

Quote:
The bendix throws the gear out every time. The bendix has to be thrown out to trigger the solenoid...and I can see it get thrown out when I turn the key


Not quite right. That arrangement actually receives it's electrical power at the solenoid the instant you turn the key on. That electrical current in less than a second retracts the solenoid which extends the pinion gear and when the solenoid is completely engaged it passes the main cranking current to the starter's drive motor.

How are you verifying it throws the pinion gear out every start attempt? If the starter is installed on the bell housing the pinion drive gear is not visible to you.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

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UncleSam
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PostPosted: Tue Dec 11, 2018 8:40 am    Post subject: Reply with quote

Thank you for the response wesk!

The actuating arm is exposed, so I can see it throwing out every time the key is turned.

Last weekend I did 2 things:

1) I bench tested it and is far as I can tell, it was throwing out really hard and spinning really fast...

2) I thought that the teeth on the starter were worn some, so I cut down the worn end on a lathe. Pretty much the same results though. Sometimes is engages and sometimes it doesn't.

*Picture is before lathe.

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wesk
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PostPosted: Tue Dec 11, 2018 10:04 am    Post subject: Reply with quote

That pinion gear looks like a 9 tooth gear as it should be if your flywheel is the correct 129 tooth flywheel.



The pinion assembly had a mild taper built into the first contact edge of the teeth to slide them in easier to engage the flywheel. What usually occurs to cause the sticking problem is the springs inside the pinion assy get weak and the rotator that tosses the pinion towards the flywheel gets dirty and sticky. This is why you can't rely on the visual movement of that external arm. Obviously when your arm has slammed what appears to be all the way and the engine isn't turning then the pinion is still a 1/2" or so short of engaging. The short answer, disassemble and clean and lube the pinion assy. If problem persists replace the pinion assy.

Keep in mind that starters are built for specific applications. Their drive extension distance, tooth count, diameter of pinion gear are all traits that are tailored to a specific installation. You may be asking that starter to do what it was not designed to do.

Personally I would get the correct starter unless of course you are running a 12 volt system. If that is the case I would get the correct 12 volt starter for the F134 which would be an MDM6005 or a MDU7004.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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