FAQ: Engine Mounting in Shallow Engine Splash Well

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Author Topic:   FAQ: Engine Mounting in Shallow Engine Splash Well

frazier posted 08-02-2015 11:15 AM ET (US)
How do you bolt an outboard to [a 17-foot Boston Whaler boat] hull? I see where to through-bolt the top engine bolts into the splash well, but the lower bolts can only be lag-bolted below the splash well. The transom is over a foot thick there, and there is no access to the transom unless [I were to] cut a six-inch hole, dig out all the foam, then put an access plate over the hole.
I just purchased a 17-foot [Boston Whaler boat] last week for $650. It has no trailer or motor. I do have an extra Johnson 48-HP and a trailer, which I will put together with this boat. The hull has a few old repairs on it and old gray paint over badly cracked gel coat. Yesterday, (August 1, 2015) we turned the hull over and ground off all the old paint and gel coat. It took two of us five hours with two grinders and over twenty 24-grit grinding discs. Today (August 2, 2015) we will repair all the bad spots with 1708, mat, and ground fiberglass, and start fairing it tomorrow (August 3, 2015) in prepartion for all new gel coat. This boat is an old military boat and [that] might be why it has no holes in the transom for an outboard.
jimh posted 08-02-2015 01:09 PM ET (US)
For information on outboard engine mounting on older Boston Whaler boats where the engine splash well is too shallow, read the FAQ.
http://continuouswave.com/whaler/reference/FAQ/#Q8
http://continuouswave.com/whaler/reference/FAQ/#Q9
You should consider reading all of the answers in the FREQUENTLY ASKED QUESTIONS section.
contender posted 08-02-2015 01:56 PM ET (US)
There are a couple of ways the engine can get mounted to the transom. The older OMC had what they called a blind hole,(I do not know when/what year they quit doing this) this was a hole between the upper and lower mounting holes that required a bolt from the inside of the transom to the engine mount bracket. (this is what I have) The newer engines are said to be mounted up two holes using the third. This gives you space to use the bottom slot to put a bolt through the transom. Some people have used an alum manual set back of 4-5 inches, this allows you to bolt 4 bolts to the transom, then bolt 4 bolts to the engine. I rigged a older whaler last year in the bahamas for a friend of mine on a 17 whaler, the engine was a 60 suzuki 4 stroke and we only used the top two holes, Im using the boat right now a year later and there is no problem with just using the two upper bolts. Your 48 Evinrude will be just fine using the upper two bolts only. Do not put more holes in the transom if you do not have to, And I would not use a lag to hold the engine...good luck to you
frazier posted 08-02-2015 02:51 PM ET (US)
Thanks for all your [replies.] I'm going to enjoy mounting this engine because when that happens it means I'm all done grinding, patching, and gel coating.

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Author	Topic: FAQ: Engine Mounting in Shallow Engine Splash Well
frazier	posted 08-02-2015 11:15 AM ET (US) How do you bolt an outboard to [a 17-foot Boston Whaler boat] hull? I see where to through-bolt the top engine bolts into the splash well, but the lower bolts can only be lag-bolted below the splash well. The transom is over a foot thick there, and there is no access to the transom unless [I were to] cut a six-inch hole, dig out all the foam, then put an access plate over the hole. I just purchased a 17-foot [Boston Whaler boat] last week for $650. It has no trailer or motor. I do have an extra Johnson 48-HP and a trailer, which I will put together with this boat. The hull has a few old repairs on it and old gray paint over badly cracked gel coat. Yesterday, (August 1, 2015) we turned the hull over and ground off all the old paint and gel coat. It took two of us five hours with two grinders and over twenty 24-grit grinding discs. Today (August 2, 2015) we will repair all the bad spots with 1708, mat, and ground fiberglass, and start fairing it tomorrow (August 3, 2015) in prepartion for all new gel coat. This boat is an old military boat and [that] might be why it has no holes in the transom for an outboard.
jimh	posted 08-02-2015 01:09 PM ET (US) For information on outboard engine mounting on older Boston Whaler boats where the engine splash well is too shallow, read the FAQ. http://continuouswave.com/whaler/reference/FAQ/#Q8 http://continuouswave.com/whaler/reference/FAQ/#Q9 You should consider reading all of the answers in the FREQUENTLY ASKED QUESTIONS section.
contender	posted 08-02-2015 01:56 PM ET (US) There are a couple of ways the engine can get mounted to the transom. The older OMC had what they called a blind hole,(I do not know when/what year they quit doing this) this was a hole between the upper and lower mounting holes that required a bolt from the inside of the transom to the engine mount bracket. (this is what I have) The newer engines are said to be mounted up two holes using the third. This gives you space to use the bottom slot to put a bolt through the transom. Some people have used an alum manual set back of 4-5 inches, this allows you to bolt 4 bolts to the transom, then bolt 4 bolts to the engine. I rigged a older whaler last year in the bahamas for a friend of mine on a 17 whaler, the engine was a 60 suzuki 4 stroke and we only used the top two holes, Im using the boat right now a year later and there is no problem with just using the two upper bolts. Your 48 Evinrude will be just fine using the upper two bolts only. Do not put more holes in the transom if you do not have to, And I would not use a lag to hold the engine...good luck to you
frazier	posted 08-02-2015 02:51 PM ET (US) Thanks for all your [replies.] I'm going to enjoy mounting this engine because when that happens it means I'm all done grinding, patching, and gel coating.