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Max Online: 36273 @ 01/23/13 02:34 PM
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#10833356 - 05/10/15 05:35 PM Drive Shaft 3/8 too long on used LU
Juggnblues Offline
Green Horn

Registered: 06/14/12
Posts: 12
Loc: Texas
Ended up cutting the splined end of an upper drive shaft to get the lower unit to mount up with out binding. There is 5/8" of the splines left and was wondering if thats enough?


Edited by Juggnblues (05/12/15 10:59 PM)

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#10833515 - 05/10/15 06:35 PM Re: Drive Shaft too Long on Used LU [Re: Juggnblues]
TLW Offline
Extreme Angler

Registered: 11/16/06
Posts: 2004
Loc: ft worth
ya hit tha "curious" button.. what kinda (motor, horse power) gear case is to long that ya can cut some oftha splined end off and then fit.. don't know of "ANY TYPE, BRAND, HORSE POWER that's gonna be that way....same type gear cases usually come in 5 or more inche difference in length that I know of....ie: merc V6 15, 20, 25, 30 inches..


Edited by TLW (05/10/15 07:21 PM)

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#10833620 - 05/10/15 07:08 PM Re: Drive Shaft too Long on Used LU [Re: Juggnblues]
Allison1 Offline
TFF Guru

Registered: 12/14/03
Posts: 16292
Loc: Grand Prairie, Tx
What he said. The mercury shafts are designed to fit 15, 20, 25 and 30 inch midsections. Cutting off any part of the driveshaft to get to the next sized shorter would cut all the spline off.

I think you may have made a boo boo. If you did cut it right its still going to have to be re-splined.

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#10833702 - 05/10/15 07:44 PM Re: Drive Shaft too Long on Used LU [Re: Juggnblues]
Juggnblues Offline
Green Horn

Registered: 06/14/12
Posts: 12
Loc: Texas
My buddy has a 93 Evinrude 150 that got water in the lower unit and messed up the gears
and broke the lower shaft. We found a used lu off a 86 Evinrude 150 XP and it all matched up except for the drive shaft it was just a little bit longer. It just had about 1/4" gap between the two halfs mating up and you could tell it was the shaft so i cut a little at a time until it mated without binding.

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#10833707 - 05/10/15 07:49 PM Re: Drive Shaft too Long on Used LU [Re: Juggnblues]
Juggnblues Offline
Green Horn

Registered: 06/14/12
Posts: 12
Loc: Texas
Its all back together and running good im just worried that if something gives it may damage the splines in the crank.

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#10833729 - 05/10/15 08:02 PM Re: Drive Shaft too Long on Used LU [Re: Juggnblues]
TLW Offline
Extreme Angler

Registered: 11/16/06
Posts: 2004
Loc: ft worth
Originally Posted By: Juggnblues
it may damage the splines in the crank.


most outlandish "modification" (even for tha OMC) I've ever heard of.. would be really concerned 'bout above..with only 5/8' engaged.


Edited by TLW (05/10/15 08:03 PM)

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#10833805 - 05/10/15 08:33 PM Re: Drive Shaft too Long on Used LU [Re: Juggnblues]
HasBen Offline
TFF Guru

Registered: 06/12/03
Posts: 21237
Loc: Nacogdoches
I wouldn't want to be a long way from the dock when it lets go.
_________________________
"I would rather wake up in the middle of nowhere than in any city on earth." Steve McQueen

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#10836758 - 05/11/15 08:33 PM Re: Drive Shaft too Long on Used LU [Re: Juggnblues]
Basshead21 Offline
Pro Angler

Registered: 03/20/05
Posts: 523
Loc: Fishing
popcorn

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#10842416 - 05/13/15 07:16 PM Re: Drive Shaft too Long on Used LU [Re: Juggnblues]
Basshead21 Offline
Pro Angler

Registered: 03/20/05
Posts: 523
Loc: Fishing
Any boat mechanic out there with any input.

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#10847410 - 05/15/15 06:24 PM Re: Drive Shaft 3/8 too long on used LU [Re: Juggnblues]
boatwhisperer Offline
Extreme Angler

Registered: 09/25/10
Posts: 1479
Loc: hurst, tx
You put a 90 degree lower unit on a 60 degree engine, the cranks are totally different you should be ok,
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