Short Shafts

Mercury Outboard  general discussion

Short Shafts

Postby Hank1995 » Fri Feb 08, 2019 5:01 pm

Re the inline sizes, were 15 inch short shafts available until the end of production (1988?)?
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Re: Short Shafts

Postby 1500J » Fri Feb 08, 2019 6:52 pm

1975 was the last "fishing" short inline 6.   76-78 the shorts were only the 1500xs.  1979-1988 20 inches was standard.  No more 15 inch motors.  25 inch was an option at some point I think.
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Re: Short Shafts

Postby Hank1995 » Fri Feb 08, 2019 7:54 pm

Thanks - Quite a lot of variation in part numbers for pistons from that era. The 1350 and the 1400 are the same but the 1500 is a different number. The good news is Marine Engine list OS pistons for many of those years and I see a smattering on ebay. I don't have my manual handy but at some point they went from 90 ci to 99 ci. I'd be interested in a rebuildable one if anyone knows of one near Omaha.
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Re: Short Shafts

Postby mercaholic » Sat Feb 09, 2019 8:44 pm

The problem with owning a short shaft in-line six is finding a period correct boat with a suitable transom to handle it.  For some time manufacturers have not produced short shaft transoms.

I have a '64 Merc 1000 and still can't find the right boat for it..... :?:
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Re: Short Shafts

Postby outboard315 » Sat Feb 09, 2019 9:56 pm

Would a 1970's Switzer 16' be a good boat for a short shaft motor.
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Mark 20, Mark 30H, WA25E, KG7H
14' Texas Maid, 12' Sea King, 12' Sea Nymph
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Re: Short Shafts

Postby Fingerlakeskid » Sat Feb 09, 2019 10:38 pm

Depends on the Switzer model Brandon. Some of the 16's and SS17's had a step hull and were made to run a standard long shaft motor. Lay some eyes on it and take a look at the transom.
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Mark 30 tiller,  (2)Mark 55, Mark 58A (2)Merc 200 FGS, Merc 450, Merc 500.  1950 CZT Penn Yan Swift, 1957 Alumacraft FD, 1985 Larson Senza w/Merc 1150,
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Re: Short Shafts

Postby 1500J » Sun Feb 10, 2019 5:42 pm

Up until the late 60's it would not be hard to find a short shaft boat..   After roughly 1970 bigger boats were mostly 20 inches .  Most people that want short shaft L6 motors for two reasons.   For a older 50's-60's short shaft boats.   A short shaft boat looks good with a short shaft motor.  Raising the transoms on the older boats 20 inches is done often but often kills the original lines of the boat IMO.   Then you got the go fast group that want the 15 inch L6.   Tunnel boats were made for 15 inch motors and when the 1500xs came out with LWPU you basically could put a 15 inch motor on a 20 inch transom sport boat and go have fast fun.

Short shafts easily bring more money than long shaft motors .   Top example: If you find a 1500 short shaft parts motor it will bring 5 times the money as a long shaft in similar condition.

So typically it not a a problem finding a hull to put your short shaft motor on.  The typical problem is  finding the correct short shaft motor in the first place since people snag them up quicker than the longs.
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Re: Short Shafts

Postby krazy karl » Sun Feb 10, 2019 6:24 pm

mercaholic wrote:The problem with owning a short shaft in-line six is finding a period correct boat with a suitable transom to handle it.  For some time manufacturers have not produced short shaft transoms.

I have a '64 Merc 1000 and still can't find the right boat for it..... :?:


Easy solution to that problem, just send it to me. I have the perfect boat which currently has twin MK 55's on it. I had been looking for a MK58 for it but started redoing the MK 55's, seals, paint, electrics etc.
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Re: Short Shafts

Postby mercaholic » Sun Feb 10, 2019 8:08 pm

Easy solution to that problem, just send it to me. I have the perfect boat which currently has twin MK 55's on it. I had been looking for a MK58 for it but started redoing the MK 55's, seals, paint, electrics etc.
kk[/quote]


I was going to spend one more summer sourcing a boat for it but if that fails, it will be time to part company with it.
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Re: Short Shafts

Postby mercules » Sun Feb 10, 2019 10:15 pm

You could buy an adjustable jackplate like I had on my last boat.
checkmate-prepcropped.jpg
Let's fix it now - before we launch the boat.
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Re: Short Shafts

Postby Hank1995 » Wed Feb 13, 2019 2:41 am

Feeling stupid right now. The boat as pictured is a 1967 Del Rio I picked up last summer. It has a 1992 Evinrude 115 VRO on it. That has to be a 20" incher.  And so, the boat, not handy right now,  has to  have 20" transom. The files I'm finding on Fiberglassics suggest as such. The pictured Merc 1000 is not a 15" inch-so its 20 and so it will fit. And so  I don't need to convert this to a 15.

This was a nice find. I paid 600 for it a few years ago. One look and you could tell it was low-hour and that whoever worked on it last was familiar with that engine and did a nice job with the re-wiring etc. Look at the wrap sound insulation. When warm it will easily start with one pull and settle down to a nice idle.
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Re: Short Shafts

Postby Hank1995 » Wed Feb 13, 2019 2:45 am

PS - The boat and a couple more pics
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