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Old 19 February 2015, 15:32   #1
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115 yamaha v4

hi, picking brains out there, will a shortshaft gearbox on a 115 v4 gearbox convert/fit a longshaft 115..thanks
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Old 19 February 2015, 15:44   #2
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No. Driveshaft is too short.
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Old 19 February 2015, 15:50   #3
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cant i just take the drive shaft out of my longshaft gearbox and fit it to the shaortshaft gearbox?
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Old 19 February 2015, 17:41   #4
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Erm... well, you could... but I'd suggest respectfully that it's a bastard of a job even if it's a new motor and a 115 Yam 2stroke is nowhere near that.
Your chances of succeeding given
A) You didn't know enough to know it wouldn't fit in the 1st place
B) Your skillset doesn't extend to knowing how to do the job already
is pretty slim.
What you'll more likely end up with is a pile of scrap aluminium, holes in your hands and a lot of bits of gearbox on the floor.

Dismantling old lower units really isn't for the inexperienced. A lot of pros won't even touch them once they get past a certain age unless they're absolutely spotless (ie unused) because they really do suffer with corrosion issues and it takes very little corrosion to make them impossible to dismantle without breaking something.

That's only half the job too-you need the hands of a midget to reassemble them and you've still got to get all the seals (which will all need replacing) back on and back in without damage.
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Old 19 February 2015, 18:12   #5
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However, a few years ago I replaced all the seals in my old 1997 Mercury 60hp, which involved dismantling the gear box and then putting everything back together, without any problems. I even made a few tools myself which helped with the job.

I accept that this could be a bar steward but so could anything on an OB that's been used in salt water.

Perhaps give it a go!

We all live and learn.

Good luck
Dave
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Old 20 February 2015, 01:55   #6
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Think you will find you have a long shaft 20" and 25". Google extension kits and use the drive shaft extension stub shaft.
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Old 20 February 2015, 04:26   #7
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well if i can buy the other gearbox for the right price ill give it ago, i have welded the crack in mine( 115@s suffer from this) and it still works fine, no water getting into gearbox oil . just really wanted to know , if the shaft from my longshaft, will fit into the shortshaft gearbox, corrosion and takin things apart ,yes can be a problem i know. besides that, great engine if abit thirsty at times. thanks for replies
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Old 20 February 2015, 07:07   #8
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Quote:
Originally Posted by dpet View Post
well if i can buy the other gearbox for the right price ill give it ago, i have welded the crack in mine( 115@s suffer from this) and it still works fine, no water getting into gearbox oil . just really wanted to know , if the shaft from my longshaft, will fit into the shortshaft gearbox, corrosion and takin things apart ,yes can be a problem i know. besides that, great engine if abit thirsty at times. thanks for replies
Fair comment-If you can get the other gearbox for a good price I'd do a long slow strip on it-leaving it in a bucket of diesel for several weeks to penetrate everything, that kind of thing- and have a go if the seals on your current one fail. Might even be worth trying to source a longshaft driveshaft from one with a cracked gearbox.
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Old 20 February 2015, 18:39   #9
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As far as I know 115 / 130 / 140 yam v4's all use the same gear box.

It's a long time (10yrs +) since I ran one but Hope that helps ?
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Old 21 February 2015, 06:30   #10
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Thanks for the replies
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