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Old 13 August 2012, 16:16   #1
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do i really need to bolt my engine on?

Hi all.

I've managed to find a 15hp mercury 2 stroke for my 3.2 honwave which i am pleased with. On reading the manual it says that you should bolt the motor to the transom as well as using the normal clamps. I can see the sense in this but is it really necessary - interested to get you views on this!

Regards

Adam
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Old 13 August 2012, 16:19   #2
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I've never had a problem, I do check on a regular basis on a run.
Jamie
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Old 13 August 2012, 16:39   #3
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I have a rope for my 9.8 Tohatsu with a stainless clip on the end fixed to the transom just in case.

But I have wondered about what damage it would do with a spinning prop if it came loose.

Toby
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Old 13 August 2012, 16:44   #4
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My current AUX is just clamped, but I have a stainless shackle onto a transom eyelet just in case because it does get a bit of a thrashing
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Old 13 August 2012, 16:56   #5
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If you are not going to use bolts, then tie the two tightening lever deals together so they can not loosen. Also on your transom in the middle of the engine plate on the inside you should see a place to clip something to the boat. Rig a cable or sturdy rope from the motor clipped off to this loop. That is so in case the motor comes loose and flies off it is still strapped to the boat.

I searched for photos but couldn't seem to find anything for tying the outboard to the boat but did find this one showing ONE way to tie the clamps together.

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Old 13 August 2012, 18:30   #6
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To bolt or not to bolt.....

I can only speak from experience, on two occasions I have very nearly lost an outboard overboard after relying on just clamp bolts alone. On both occasions I have been 'exploring the limits' of hull and motor in adverse conditions..... well it's what ribs were made for!
On both occasions the motor's shifted (read all but fell off) and were only saved by the soldered battery cables and control cables! I have also dived on and recovered a manual start Johnson for another 'enthusiastic' owner who clearly decided not to bolt.
Locking the clamp handles together is good advice but it's suprising how things can shift after a bit of water lubrication and a day or two of enthusiastic use.
A tether line is good insurance for a tiller steer but is no substitute for a proper through fixing.
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Old 13 August 2012, 18:37   #7
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If you plan to leave it on permanently then I would bolt it (mine is) as its one less think to worry about, and one extra hurdle for anyone who tries to nick it.

If you plan to take if off each time then Peter_C's advice above seems right. I'd also suggest that if relying on 'toggle screws' ideally you want a clamp plate (or the top of the transom) which has a lip that would mean the clamps have to really move out for the motor to slip.
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Old 13 August 2012, 18:47   #8
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thanks for the replies all.

before i do the 'right' thing and bolt it on, does anyone know what the transom is made of on a honwave sib? if it is solid material then presumably there is no need to put sealant round the bolt holes to stop water ingress?
The engine wont be removed every use but probably on and off every couple of days when we are on holiday.
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Old 13 August 2012, 18:56   #9
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ajs73 - if you plan to take it on and off more than once or twice a year, I wouldn't bother, never mind every few days.

Not sure what the transom design is - but it would be unusual not to need to seal any holes you drill.
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Old 13 August 2012, 19:00   #10
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Quote:
Originally Posted by ajs73
thanks for the replies all.

before i do the 'right' thing and bolt it on, does anyone know what the transom is made of on a honwave sib? if it is solid material then presumably there is no need to put sealant round the bolt holes to stop water ingress?
The engine wont be removed every use but probably on and off every couple of days when we are on holiday.
If your taking it on and off I wouldn't worry, just clamp it on tight, secure the thumb turns together with something like a cable tie (that's what ive seen the RNLI do on there inflatables) and tie a rope to the OB and to the transom.

That's what I do with mine and I've never had trouble.

Would be a pain to assemble and dismantle if you've got to undo bolts.

The transom will be marine ply and possibly coated in fibreglass.

If you do drill it I would seal it with sikaflex.
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