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O T- Auto-Lite MAB 4046 Starter Nose Cone Disassembly

O T- Auto-Lite MAB 4046 Starter Nose Cone Disassembly

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daron
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OM or others-

I'm trying to disassemble a starter for an AC Model M crawler. The motor spins but the pinon does not. I've never had one of this type apart and cannot see how it's put together (held together on the armature shaft). Thanks for any advice.

Daron
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Fri, Jun 28, 2019 9:04 AM
STEPHEN
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If you had a pic, I could be more exact, but it is probably as this: the bendix is connected to the armature by a torsion spring. First mark the case and end plates for reassembly, remove the tie bolts holding everything together and remove the drive end housing. You will probably find that the spring or its fastening need attention.
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Fri, Jun 28, 2019 9:38 AM
Old Magnet
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Reply to STEPHEN:
If you had a pic, I could be more exact, but it is probably as this: the bendix is connected to the armature by a torsion spring. First mark the case and end plates for reassembly, remove the tie bolts holding everything together and remove the drive end housing. You will probably find that the spring or its fastening need attention.
I don't have any detailed Autolite info but I understand the same MAB4046 starter is used on Allis Chalmers Models "U" and "UC" wheeled versions.
I don't see where there would be any mystery to disassembly/assembly, what seems to be the problem?
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Sat, Jun 29, 2019 7:12 AM
daron
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With both family and non-family company this fell to the back burner.

Stephen and OM I initially pulled the drive end from the motor body and couldn't figure how to separate the nose cone/Bendix assy from the armature due to the sheet metal dust cover (as I found out) being only pressed into the nose cone. I looked for holding screws, inside circlips, etc. to no avail. I finally just knocked it off, found a broken spring and have ordered a replacement from Stiner Tractor.

Thanks for setting my mind at ease.

Daron
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Fri, Jul 5, 2019 9:25 AM
daron
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Stiner Tractor Parts spring was wrong one. "Left" wound vs "right" wound.

After more looking found another possibility from NAPA. Ordered same and it arrived this afternoon.

In removing the mounting shoulder bolts holding the old spring on (they have bend over 'locks') I noticed they both were not tight. Is this normal practice?

Doesn't seem right to me.

Thanks, Daron
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Wed, Jul 24, 2019 7:54 AM
STEPHEN
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Reply to daron:
Stiner Tractor Parts spring was wrong one. "Left" wound vs "right" wound.

After more looking found another possibility from NAPA. Ordered same and it arrived this afternoon.

In removing the mounting shoulder bolts holding the old spring on (they have bend over 'locks') I noticed they both were not tight. Is this normal practice?

Doesn't seem right to me.

Thanks, Daron
[quote="daron"]Stiner Tractor Parts spring was wrong one. "Left" wound vs "right" wound.

After more looking found another possibility from NAPA. Ordered same and it arrived this afternoon.

In removing the mounting shoulder bolts holding the old spring on (they have bend over 'locks') I noticed they both were not tight. Is this normal practice?

Doesn't seem right to me.

Thanks, Daron[/quote]
No expert on that, but I would expect a shoulder bolt to be tight, that keeps it from bending at the thread. Loc-Tite!!!!
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Wed, Jul 24, 2019 9:11 AM
oldbeek
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Reply to STEPHEN:
[quote="daron"]Stiner Tractor Parts spring was wrong one. "Left" wound vs "right" wound.

After more looking found another possibility from NAPA. Ordered same and it arrived this afternoon.

In removing the mounting shoulder bolts holding the old spring on (they have bend over 'locks') I noticed they both were not tight. Is this normal practice?

Doesn't seem right to me.

Thanks, Daron[/quote]
No expert on that, but I would expect a shoulder bolt to be tight, that keeps it from bending at the thread. Loc-Tite!!!!
Daron, they should have the lock tabs, but they all loosen up with use. They take a hard hit every time the starter engages the flywheel. 60% of the failures with those type starters were just the bolts coming loose. That was the age before Locktite. May be a good idea to use some. Cant hurt. We stocked all those drives, springs, locks and bolts in the late 60s.
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Wed, Jul 24, 2019 11:20 AM
Old Magnet
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Reply to oldbeek:
Daron, they should have the lock tabs, but they all loosen up with use. They take a hard hit every time the starter engages the flywheel. 60% of the failures with those type starters were just the bolts coming loose. That was the age before Locktite. May be a good idea to use some. Cant hurt. We stocked all those drives, springs, locks and bolts in the late 60s.
Especially hard on drive springs and bolt anchors when running 6V starters on twelve volts but that doesn't stop us from doing so. Only lost one spring so far in my life time.
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Wed, Jul 24, 2019 11:02 PM
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