151A1 starter has power, engine won't turn over.

1959 - 1978, M151, M151A1, M151A2, Technical questions and discussions, regarding anything related to the M151.
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Gunbunny198
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151A1 starter has power, engine won't turn over.

Post by Gunbunny198 » Tue Apr 23, 2019 1:23 pm

Hello,

So I just bought a 151A1, and did a water pump and valve cover gasket two days ago. Drove it out of the garage and parked it no problem. Trying to start it today, (it has rained last couple days) and the gages power up, starter turns but engine will not turn over. Any ideas? Can I check spark if the engine doesn't turn over?

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Re: 151A1 starter has power, engine won't turn over.

Post by markrdje » Tue Apr 23, 2019 7:02 pm

Try turning the engine over by hand, then remove starter see if it works which also means the gear kicks out
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Re: 151A1 starter has power, engine won't turn over.

Post by Gunbunny198 » Wed Apr 24, 2019 4:06 am

markrdje wrote:
Tue Apr 23, 2019 7:02 pm
Try turning the engine over by hand, then remove starter see if it works which also means the gear kicks out
It looks like the gear kicked out. I pulled the starter and pulled the pinion forward on the threaded shaft, replaced and it started fine. Do you know what causes this? Once it started, I shut it off and it did the same thing so I assume it did this again. Gonna work on it again today.

Thanks
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Re: 151A1 starter has power, engine won't turn over.

Post by Rickf » Wed Apr 24, 2019 5:52 am

It sounds like the bendix is bad, is there any lubrication on the shaft? Try just a little lube on the starter shaft, not much. Whatever you do do not try to take the bendix apart! You will have pieces fly everywhere and even if you contain them all you will not be able to get it back together. It is replaced as a unit.
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Re: 151A1 starter has power, engine won't turn over.

Post by Gunbunny198 » Wed Apr 24, 2019 6:54 am

Rickf wrote:
Wed Apr 24, 2019 5:52 am
It sounds like the bendix is bad, is there any lubrication on the shaft? Try just a little lube on the starter shaft, not much. Whatever you do do not try to take the bendix apart! You will have pieces fly everywhere and even if you contain them all you will not be able to get it back together. It is replaced as a unit.
Rickf,

Thanks. I have a spare I am bringing in to get rebuilt today. There was what looked like a grease on the shaft. Is it supposed to retract and reset?


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Re: 151A1 starter has power, engine won't turn over.

Post by Rickf » Wed Apr 24, 2019 7:08 am

It will only retract when the engine starts and overruns the clutch. You cannot retract it by hand normally. So basically if you pull it out it will stay out and that is normal. You install it that way and the first time it starts it will retract. Sometimes they do not retract once started, mine does that off and on. That is a sign they are going bad. The original version of the 151 had a bell housing with a plate over the starter clutch and in the arctic they used a setup that had a lever on the starter clutch where you could disengage it if it did not do so itself due to the extreme cold. They discontinued that with the onset of the A1.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

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Re: 151A1 starter has power, engine won't turn over.

Post by Gunbunny198 » Wed Apr 24, 2019 6:45 pm

So it appears mine is retracting but not kicking out to re-engage the fly wheel when I go to start. I cleaned the shaft the best I could and reapplied a light bit of gear oil. Didn't help. Hopefully the one I dropped off today can be rebuilt and then I can have this one done as well. Thanks for all the help thus far!
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Re: 151A1 starter has power, engine won't turn over.

Post by Kurt Lesser » Wed Apr 24, 2019 6:54 pm

The Bendix gear is thrown forward by the inertia of the starter motor and is kicked out of the flywheel gear when the engine starts. If the brushes in your starter are at end-of-life they may not have enough current handling capacity to make the bendix behave properly. I would pull the starter apart and take a good look at the brushes on the starter commutator and the springs that hold them against it. It could be a simple case of the starter needing to be rebuilt. Almost any shop should be able to do it for you and one of the things they will do that the average garage mechanic won't/can't do is turn the commutator so the new brushes seat completely on it.
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Re: 151A1 starter has power, engine won't turn over.

Post by W. Winget » Thu Apr 25, 2019 4:49 am

Just have to ask, are you running both batteries in series for 24Volts?
If you are attempting to run it on one 12 volt battery, or wired in parallel, there's not enough voltage in there to run the 24V vehicle properly.
Sounds like a dumb question, but things like this happen.
V/R W Winget

Ground to negative on 1st battery
Positive of 1st battery to negative of 2nd battery (short jumper cable)
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Re: 151A1 starter has power, engine won't turn over.

Post by Gunbunny198 » Thu Apr 25, 2019 5:14 am

Yes in series the way it is set to be. And no problem I hear ya

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