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I just looked at the diagram Phil posted from BW showing engine installation on the 2008 13 Sport.

First of all, I am shocked they actually used 5200 adhesive for bolt caulking. As this damage here makes clear, that should never have been done. Somebody didn't know what they were doing.

Secondly, they show all four engine bolts installed from the inside, with nuts on the outside. That is in DIRECT CONFLICT with Mercury's engine installation requirements that they have used for almost 30 years, where bottom bolts MUST go in from the outside for proper bolt sealing and engine security. Whoever at Whaler made that drawing must not have been familiar with Mercury's insturctions, or there must be some oddity with the 13' hull that does not permit the lower bolts to be done as Mercury specifies.