1988 125 Force ? Driveshaft ?

Ksmith0110

Ksmith0110

Petty Officer 2nd Class
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Jul 18, 2009
Messages
118
Just got a 1988 Force 125 that runs, but the prop doesn't turn. Previous owner said it was running and made a snapping/whirring noise and the prop stopped. The motor still ran but the prop no longer worked. I haven't got into it yet, but I was wondering if someone could point me in the right direction.
 
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foodfisher

Captain
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Feb 18, 2009
Messages
3,756
Re: 1988 125 Force ? Driveshaft ?

Get a manual and dig in. The prop is connected to the propeller shaft, the propeller shaft is connected to the ...... wife just said to keep my day job. Drive train, shifter linkage, ----snap,whirr is kind of fun.
 
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OldNBold51

Petty Officer 2nd Class
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Apr 19, 2010
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Re: 1988 125 Force ? Driveshaft ?

Ksmith0110 said:
Just got a 1988 Force 125 that runs, but the prop doesn't turn. Previous owner said it was running and made a snapping/whirring noise and the prop stopped. The motor still ran but the prop no longer worked. I haven't got into it yet, but I was wondering if someone could point me in the right direction.
Click to expand...

My guess is the driveshaft is broken. You need to drop the lower unit and inspect. The drive shaft will be in 2 pieces if broken. Is there a very noticeable ding in the prop?
 
Ksmith0110

Ksmith0110

Petty Officer 2nd Class
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Jul 18, 2009
Messages
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Re: 1988 125 Force ? Driveshaft ?

I don't want to get a manual just yet, I might not keep the motor. Is there anyone here that could describe how to remove the lower unit? I don't even see any bolts?:confused:
 
further

further

Lieutenant Junior Grade
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1,031
Re: 1988 125 Force ? Driveshaft ?

Check out the "how to replace the impeller" sticky at the top of this forum. Good instructions on how to drop the LU.
Good luck!
 
Ksmith0110

Ksmith0110

Petty Officer 2nd Class
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Messages
118
Re: 1988 125 Force ? Driveshaft ?

Got it apart, found a broken driveshaft. It broke right under the waterpump. This thing looks to be about 31" - 32" long. (if it were in 1 piece) There are listings for a 20" or 25" driveshaft. I'm assuming that it is the 25".
 
Ksmith0110

Ksmith0110

Petty Officer 2nd Class
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Jul 18, 2009
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Re: 1988 125 Force ? Driveshaft ?

I guess this is the long shaft motor. Can anyone tell me what lower unit will interchange? It's a 1988 Force 125 MODEL #1251XBC ? I think?
 
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OldNBold51

Petty Officer 2nd Class
Joined
Apr 19, 2010
Messages
169
Re: 1988 125 Force ? Driveshaft ?

Ksmith0110 said:
I guess this is the long shaft motor. Can anyone tell me what lower unit will interchange? It's a 1988 Force 125 MODEL #1251XBC ? I think?
Click to expand...

an 85 hp lower unit long shaft will also work, but the gear ratio is different (lower). I do not know the which yrs are interchangeable. You can look it up by comparing part numbers from 1 year to the next.
 
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