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Old 14 September 2015, 12:36   #1
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Engine bolt hole sealing

Seen all suggestions. Over drilled then epoxy filled, sealant, adhesive etc. having just replaced transom, I want to get it right. What's the best method please
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Old 14 September 2015, 12:57   #2
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Quote:
Originally Posted by gtflash View Post
Seen all suggestions. Over drilled then epoxy filled, sealant, adhesive etc. having just replaced transom, I want to get it right. What's the best method please
My procedure:
1. Mark & drill transom.
2. Wipe bolts and holes with acetone, allow 5 min to evaporated (degrease).
3. Liberally apply Sikaflex 291 to both the bolt holes and the bolts.
4. Hang engine, install bolts + washers + nuts.
5. Remove excess sealant with wipes + denatured alcohol.
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Old 15 September 2015, 09:47   #3
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I was always taught Sika below the waterline, Silicon above..... And shit loads of it, followed by a proper clean up after fully tightened.
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Old 15 September 2015, 11:51   #4
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Use Sitka 291, 3m 4200 or Saba tack 750. All good, as said before, lots on the bolts and in the holes, around the washer as you apply then it gets squeezed out as tighten, clean up with trade wipes or acetone.

I would avoid silicone on boats, in my opinion it does not adhere, it's great in bathrooms!!
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