Outboard motor shaft length

Submitted: Monday, Jan 18, 2010 at 22:33
ThreadID: 75319 Views:2538 Replies:4 FollowUps:1
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I have just bought from a neighbour a Brooker tinny with a Johnson 7.5 outboard. I noticed the shaft length of the motor is a fair bit longer than the boat transom. Transom height is about 390mm. Outboard from the transom bracket clamp to cavitation plate is 450mm or 17.7''. I thought shaft length would be either 15'' or 20'' not half way between.
Just wondered if any one knows if this motor is a long or short shaft? Thanks.

Tony
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Reply By: BarryMcKenzie - Tuesday, Jan 19, 2010 at 01:24

Tuesday, Jan 19, 2010 at 01:24
Gday Tony, an outboard mechanic from a good boat shop would be able to tell you what sort of outboard it is if u give them the model #, serial # and year model.
A rough guide when setting an outboard onto a transom is to start with the cav plate lining up with the bottom of the transom where it meets the hull....sounds like you may have to lift yours with a block or similar. I used a piece of square 40x40 alloy tube between bracket clamps and transom top and it still clamps well onto transom. hope this has been of some help cheers.
AnswerID: 400121

Reply By: Volvo driver - Tuesday, Jan 19, 2010 at 07:56

Tuesday, Jan 19, 2010 at 07:56
some say 15 is short, others say 17 is still within the short variety,
probably off a yacht originally though
AnswerID: 400132

Reply By: Shaker - Tuesday, Jan 19, 2010 at 10:58

Tuesday, Jan 19, 2010 at 10:58
If it is a long shaft it will have an "L" in the model number.

AnswerID: 400157

Reply By: Member- Tony C - Tuesday, Jan 19, 2010 at 21:41

Tuesday, Jan 19, 2010 at 21:41
Thanks Barry, Volvo driver and Shaker for your advice. I thought If it was a long shaft I could use it also as an auxilliary motor on my other boat. I couldn't see an L on the serial No. so presume its a short shaft. I will lift it on the transom with a block of aluminium.

Cheers
Tony
AnswerID: 400252

Follow Up By: Shaker - Tuesday, Jan 19, 2010 at 22:37

Tuesday, Jan 19, 2010 at 22:37
It shouldn't need lifting.
If the transom measures around 15" then it will be OK.
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FollowupID: 669379

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