shear pin for my old penta!

[adli100]

Firstly hello to everyone out there hello
I finally bought my first boat and engine to take my kids down the river and see the world from the rivers view. Well after my first journey I have managed to snap the shear pin I think I touched the bottom maybe a rock but then seemed to totally lose power the engine still ran but the propeller wasn't turning so I think the problem I have is that I have been told my penta archamedies hp5 is obsolete and you can't get them anymore does anyone have any advice of what I can do? Do other sheer pins match the ones I need hope that isn't the end of my boating carreer Already!!

 

[adli100]

I've taken a measurement of the pin and its a 3mm diameter 23mm long so I ordered half a meter of brass bar and I'm going to make a few up!

 

[DownWest]

Sounds a good plan. Your engine is pretty ancient, so you will have to quite inventive in the future. Might be an idea to buy some oars too....

Oh, and welcome...

 

[VicS]

I have one of those old Penta engines although mine is badged Volvo Penta 51.
The shear pins for mine are larger at 5mm x 35mm They are strongly magnetic so not brass nor a 300 series stainless steel. The "in-service" one is not rusty so not mild steel either. Perhaps a 400 series stainless steel ???

I doubt if brass will be tough enough.

You may find new pins on ebay. Always a few bits for these old engines kicking about.

I pensioned mine off nearly 30 years ago because it was so unreliable, noisy too, but it still lives in a dark cobwebbed corner of the garage.

Instruction manual at http://s50.photobucket.com/user/Vic43/library/V Penta 39 51 if of any use to you

make sure you take a spare spark plug and a plug spanner with you

 

[DownWest]

I just checked the spare for my Yamaha 3.5 and it is brass. 5mm diameter.

Friend asked me to get the prop off his Torqueedo after he had knocked a blade off on a submerged tree. Nut come off fine, but I had to use a puller to get the plastic prop off. Why? because the pin was plain old steel and had rusted. Not impressed.

 

[vyv_cox]

A few years ago I cut short lengths off a 3.2 mm brazing rod, which seemed to be very similar to the ones I could buy at an outrageous price. The engine was either a Mercury or a Toshiba, not quite sure which I had at the time.