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Honda BF150 overheated, now won't move
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Pacificcoast101



Joined: 28 Sep 2007
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PostPosted: Tue Dec 31, 2019 8:34 pm    Post subject: Honda BF150 overheated, now won't move Reply with quote

We had just throttled up outside the marina when the starboard motor revved up and the overheating light and alarm sounded. I shut the motor down immediately and checked for kelp or plastic blocking the intake. Everything was clear. After a few minutes, I started the motor but despite the throttle shifting into gear, the propeller wouldn't spin.

We came back in under the power of the other motor. Back in the slip, I found that the propeller will lock while in forward and reverse gears and spin while in neutral, but will not turn with the motor on. There is also no pee stream. I'm going to haul the boat out and replace the impeller but was wondering if the prop not turning is a safety feature in the motor or do I have bigger problems to deal with?

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TyBoo



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PostPosted: Tue Dec 31, 2019 9:02 pm    Post subject: Reply with quote

I would guess that the hub in the prop has spun and the output shaft turns inside of it when in gear.

That's just my guess, though. I don't think there is any other safety feature to create the conditions you found. The other option would be the splines on the drive shaft stripped but we do not want that to be it.

Sorry I can't do more than guess, and sorry for your troubles. Please keep us posted.

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tsturm



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PostPosted: Tue Dec 31, 2019 9:33 pm    Post subject: Re: Honda BF150 overheated, now won't move Reply with quote

Pacificcoast101 wrote:
We had just throttled up outside the marina when the starboard motor revved up and the overheating light and alarm sounded. I shut the motor down immediately and checked for kelp or plastic blocking the intake. Everything was clear. After a few minutes, I started the motor but despite the throttle shifting into gear, the propeller wouldn't spin.

We came back in under the power of the other motor. Back in the slip, I found that the propeller will lock while in forward and reverse gears and spin while in neutral, but will not turn with the motor on. There is also no pee stream. I'm going to haul the boat out and replace the impeller but was wondering if the prop not turning is a safety feature in the motor or do I have bigger problems to deal with?


Or the drive shaft broke where the splines enter the crank shaft.
That would explain no water pump. Been there before Cry
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Pacificcoast101



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PostPosted: Tue Dec 31, 2019 10:53 pm    Post subject: Reply with quote

Would that still allow the prop to lock into forward and reverse gears and spin in neutral?
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TyBoo



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PostPosted: Tue Dec 31, 2019 11:38 pm    Post subject: Reply with quote

Yes, any of the above guesses could do that. If the prop hub is the culprit there could be enough grip left to make it difficult to slip by hand. The same with stripped splines or a broken drive shaft if it is bound internally between the gearbox and the break.

Now that I think about it the water pump not working makes the culprit more likely to be the shaft not being turned by the motor as tsturm said. Whatever it is should become clear when the lower unit is pulled to check the impeller in the water pump.
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tsturm



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PostPosted: Wed Jan 01, 2020 1:49 pm    Post subject: Reply with quote

Pacificcoast101 wrote:
Would that still allow the prop to lock into forward and reverse gears and spin in neutral?


Yup. I won't say LOCK Wink But it will be darn hard to turn.
(if you turn your prop hard enough while in gear you can turn the engine over, I would advise against that.)

pull the lower unit off & let us know. Have a great new year!!! Beer Mr. Green
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tsturm



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PostPosted: Wed Jan 01, 2020 2:43 pm    Post subject: Reply with quote

tsturm wrote:
Pacificcoast101 wrote:
Would that still allow the prop to lock into forward and reverse gears and spin in neutral?


Yup. I won't say LOCK Wink But it will be darn hard to turn.
(if you turn your prop hard enough while in gear you can turn the engine over, I would advise against that.)

pull the lower unit off & let us know. Have a great new year!!! Beer Mr. Green


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cmetzenberg



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PostPosted: Thu Jan 02, 2020 8:47 am    Post subject: Reply with quote

I've got a spare BF 150 lower if you end up needing one....lots of other BF 150 parts too.
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Pacificcoast101



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PostPosted: Thu Jan 02, 2020 6:49 pm    Post subject: Reply with quote

I'll keep that in mind. We pulled the lower unit today and the drive shaft sheared off, just like tsturm's photo.
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cmetzenberg



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PostPosted: Thu Jan 02, 2020 10:27 pm    Post subject: Reply with quote

Pacificcoast101 wrote:
I'll keep that in mind. We pulled the lower unit today and the drive shaft sheared off, just like tsturm's photo.

port or starboard engine?
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Pacificcoast101



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PostPosted: Fri Jan 03, 2020 10:45 am    Post subject: Reply with quote

Starboard.
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localboy



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PostPosted: Fri Jan 03, 2020 2:07 pm    Post subject: Reply with quote

Something is wrong with that shear. It's way too clean and perfect. Makes me wonder about a defect in manufacturing. In the photo it actually looks like two, separate machined pieces.
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tsturm



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PostPosted: Fri Jan 03, 2020 2:26 pm    Post subject: Reply with quote

localboy wrote:
Something is wrong with that shear. It's way too clean and perfect. Makes me wonder about a defect in manufacturing. In the photo it actually looks like two, separate machined pieces.


Don't know about the Honda, the Yamaha in the pict. has a relief cut where it broke. Worked just like it was designed to & saved the crank. Wink
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Pacificcoast101



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PostPosted: Fri Jan 03, 2020 4:20 pm    Post subject: Reply with quote





Cell phone photos of my Honda drive shaft.
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Moxieabs



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PostPosted: Fri Jan 03, 2020 4:30 pm    Post subject: Reply with quote

Any sign of the prop hitting debris? Is th prop SS or aluminum?
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