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Old 14 September 2010, 18:26   #1
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Country: UK - Scotland
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Mounting outboard

Now at the stage of mounting the Tohatsu 60hp onto the Ribcraft 4.8m. Ribcraft have already predrilled the holes, so one less thing to worry about. Engine uses S/S 105mm M12 bolts and penny washers, nyloc nuts, etc. What's the preferred sealant for this job. Marine Sikaflex (192) or Dow Corning or 3M silicone sealant? Ideally I want clear, as I have other things to fix around the boat. Any suggestions?

Tohatsu recommend having the bolt heads on the outside, but my last boat they were on the inside and left a cleaner looking job. Again - any preference?
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Old 14 September 2010, 19:43   #2
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Originally Posted by spartacus View Post
Now at the stage of mounting the Tohatsu 60hp onto the Ribcraft 4.8m. Ribcraft have already predrilled the holes, so one less thing to worry about. Engine uses S/S 105mm M12 bolts and penny washers, nyloc nuts, etc. What's the preferred sealant for this job. Marine Sikaflex (192) or Dow Corning or 3M silicone sealant? Ideally I want clear, as I have other things to fix around the boat. Any suggestions?

Tohatsu recommend having the bolt heads on the outside, but my last boat they were on the inside and left a cleaner looking job. Again - any preference?
Nuts on the inside. You can't really fit an outboard lock otherwise...
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Old 14 September 2010, 20:03   #3
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Nuts on the inside. You can't really fit an outboard lock otherwise...
I'd say have the nut on the inside for the single bolt you use the lock on and nuts on the outside for the others. This way, it's neater inside the boat and you won't have any protruding bolts to damage the fuel tank, or injur any people who fall about near the transom.
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Old 15 September 2010, 02:47   #4
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I'd say have the nut on the inside for the single bolt you use the lock on and nuts on the outside for the others.
That's how I did the SR.
The Vmax is all nuts outboard as it doesn't have a lock.
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Old 15 September 2010, 03:50   #5
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I'd say have the nut on the inside for the single bolt you use the lock on and nuts on the outside for the others. This way, it's neater inside the boat and you won't have any protruding bolts to damage the fuel tank, or injur any people who fall about near the transom.
Sounds good to me - that's how I had the Zodiac Pro set-up. What about the sealant?
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Old 15 September 2010, 04:58   #6
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What about the sealant?
Sikaflex 291, or a budget equivalent
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Old 15 September 2010, 10:14   #7
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Get the twatsu upgraded to 70hp if its the carbed 2 stroker....it will be much better IMHO

Standard mounting bolts should be a 1/2" fine thread, high tensile, not bog standard 12mm.
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Old 15 September 2010, 14:52   #8
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Get the twatsu upgraded to 70hp if its the carbed 2 stroker....it will be much better IMHO

Standard mounting bolts should be a 1/2" fine thread, high tensile, not bog standard 12mm.
Already have it on my 'to do list' thanks.
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Old 15 September 2010, 18:20   #9
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Nuts on the inside. You can't really fit an outboard lock otherwise...
We've got locking nuts over here and put can still that one on the outside
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Old 18 September 2010, 11:58   #10
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They're talking anti-theft type locking; not self-locking to prevent coming loose.
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