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Old 09-01-2020, 16:55   #1
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Nissan/Tohatsu M3.5A (3 hp) removing Prop problem

I have two friends. Each have motors that look similar. They seem to both be Tohatsu M3.5A outboards. One is branded Mercury and is pretty new, about 2005. The other is a Nissan older perhaps 1998.

They both had leaking gas tanks which I replaced. They both started and ran, but would not drive the boat. They both have plastic props.

I worked on the Mercury first. I pulled the cotter pin holding the prop, and I spun the prop right off. The shear pin was sheared and buried in the plastic internally. I replaced the shear pin, put the prop right back on. The motor started, ran and drove the 14 foot boat along at a good clip.


On the Nissan, I can't seem to get the prop off. I pulled the cotter pin, but when I spin the prop it doesn't seem to unscrew, but just spins on the shaft. Any ideas on how I can get it off with out cutting it off?

Thanks for your help. Regards Captain Tom
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Old 09-01-2020, 17:36   #2
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Re: Nissan/Tohatsu M3.5A (3 hp) removing Prop problem

The prop on my Tohatsu 3.5B simply slides off the shaft after the cotter pin is removed. There is no threaded attachment; it just pulls off the shaft leaving the shear pin in its hole in the shaft. At least, that is my memory.

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Old 10-01-2020, 04:38   #3
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Re: Nissan/Tohatsu M3.5A (3 hp) removing Prop problem

Else where some one said "Prop puller" Question is how to use one here is the prop:


simply pulling by hand hasn't been effective, but I may be a weakling
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Old 10-01-2020, 06:00   #4
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Re: Nissan/Tohatsu M3.5A (3 hp) removing Prop problem

On mine I have to use a flat headed screw driver to pry the prop down the shaft to get it started. Once it's down 1/4" it slides right off.
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Old 10-01-2020, 13:56   #5
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Re: Nissan/Tohatsu M3.5A (3 hp) removing Prop problem

On my Tohatsu 3.5A the plastic prop slides off the shaft (once the cotter pin is removed )and no threads are involved. New props are for that engine are available from Amazon for <$20.00
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Old 12-01-2020, 07:36   #6
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Re: Nissan/Tohatsu M3.5A (3 hp) removing Prop problem [solved]

Fixed it ! Placed the lower unit in a vise. Then Banged on the prop smartly with a hammer. came off as stated by cat boat willy.

It appears part of the prop was jamming it. I'll probably get new prop as well.

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