K&B 3.5 Outboard Set Screw

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1olddog

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Dec 5, 2007
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27
Anybody know what size allen wrench the set screw on the drive dog on a K&B 3.5 cc outboard takes ? I looked on Mecoa's site but found no info about it.
 

BrianTooms

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Jul 9, 2009
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263
I just checked one I have here and it looks like it's a pressed in roll pin. You should be able to tap it out. But it comes as one assembly. Is the dog worn out?

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BrianTooms

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Jul 9, 2009
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Thanks Brad I had to get a magnifying glass lol.

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brad nichols

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May 10, 2010
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2,722
They are small!! I don't have a pin punch that will work. Piano wire I guess? There is a good deal on a Kep's 4SL boat in the for sale sec.

Brad
 

BrianTooms

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Nice boat but I don't know about that builder lol.

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1olddog

Active Member
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Dec 5, 2007
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27
I just checked one I have here and it looks like it's a pressed in roll pin. You should be able to tap it out. But it comes as one assembly. Is the dog worn out?

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I didn't have a small enough punch so I used a small allen wrench and tapped it out. The unit had a lot of wobble in it and I thought I might be able to put a brass sleeve in it to take the wobble out.This little prop shaft assemblies are costly so I thought I might be able to rebuild it.
 

LohringMiller

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Jan 25, 2017
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624
I suggest replacing it with a Hyperformance unit. They are much more durable. I have rebuilt both 3.5 and 7.5 K&B shaft assemblies using K&B bushings. My attempts with bronze bushings didn't work as well. Even so. the rebuilt K&B units develop play very quickly.

Lohring Miller
 

Alan Elzer

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May 21, 2006
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1,205
Anybody know what size allen wrench the set screw on the drive dog on a K&B 3.5 cc outboard takes ? I looked on Mecoa's site but found no info about it.
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1olddog

Active Member
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Dec 5, 2007
Messages
27
Thanks everyone for the replies. I sold a K&B 3.5 cut for an electric conversion to a guy and gave him this prop shaft assembly in case he wants to try to fix it.
 
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