Dealer Bulletin 84-10 on Engine Mounting - Moderated Discussion Areas

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Author Topic:   Dealer Bulletin 84-10 on Engine Mounting

jimh posted 04-11-2009 08:50 AM ET (US)
I have added a new article to the REFERENCE section which reproduces the Boston Whaler publication DEALER BULLETIN 84-10. This bulletin deals with two problems encountered with engine mounting:
--clearance of the lower mounting holes in the 16-foot or 17-foot hulls which have a shallow splash well, and
--mounting certain OMC engines on the curved transom of 13-foot hulls.
The article is located at
http://continuouswave.com/whaler/reference/bulletin84-10.html
This thread can be used for any follow-up questions or discussions on this topic.
Tom W Clark posted 04-11-2009 09:52 AM ET (US)
Thanks Jim. Well done.
ratherwhalering posted 04-13-2009 02:05 PM ET (US)
Jim, thanks for clearing this up for me.
Wasatch Whaler posted 07-19-2009 08:44 AM ET (US)
The Dealer Bulletin states: "...It will be necessary to angle your drill bit slightly upward to ensure these holes enter the splash well."
I fully understand the concept, but in drilling a transom I want to do it right the first time and not make swiss cheese out of the transom. "Slightly angling a drill bit" is way to vague and imprecise for me.
Does anyone know the correct angle to drill the lower holes on a 15' Sport so the bolts will clear the inner splash well?
Tom W Clark posted 07-19-2009 10:57 AM ET (US)
Jay,
There is no official angle specification for those holes. If you want to do it right, I would not rely on any specification or advice given by anonymous contributors on the internet, go measure it yourself.
I suggest you make a template of the transom cross section and splashwell. This would be easy to do with a piece of stiff sheet material. I would use some 1/8" hardboard and cut a notch representing the transom.
Drop this over the transom where the bolts holes will be and scribe the shape of the splashwell so the template nests perfectly over the transom and splashwell.
You can them remove the template and see exactly where the entry and exit of the lower bolt holes need to be.
You will need to have your hardware in hand and have made any modification to your washers.
I would not assume you necessarily need to angle the holes but it should become evident with a template.
number9 posted 07-19-2009 11:38 AM ET (US)
Is there a reason this wouldn't be an option for shallow well installation?
BW is known for their conservative max hp ratings. Their engine mounting height recommendations have also be conservative by many of today's practices.
Why not mount the motor two holes up and then drill for the top lower hole or top of slot? You'd gain another 3/4" of clearance from the bottom of the well.
jimh posted 07-19-2009 12:09 PM ET (US)
The suggestion to drill the engine mounting holes in the transom with a non-standard vertical spacing is mentioned in the bulletin, although they suggest only 0.75-inch or one-hole equivalent.
jimh posted 07-19-2009 12:59 PM ET (US)
If you drilled the lower mounting holes in the transom for mounting the engine a minimum of two-holes-up, or 1.5-inch higher, you might find yourself with an engine that was too high. Mounting one-hole up seems like a good place to start, and also a good place to finish for many people.
Wasatch Whaler posted 07-21-2009 10:24 AM ET (US)
Tom,
Thanks for your suggestion on a method to determine the appropriate angle. I had to read it over a couple of times to fully understand the technique, but now I've got it. I think it should work great and I won't screw up the transom.
I understand (and agree with) your concern regarding suggestions from anonymous contributors.
I participate in a few Internet forums and I've found CW to be the best in a lot of ways. I "lurked" for quite a while before becoming a member and to me there are several CW members who are "trusted agents".
Jay

Wasatch Whaler posted 07-21-2009 10:55 AM ET (US)
Tom,
Thanks for your suggestion on a method to determine the appropriate angle. I had to read it over a couple of times to fully understand the technique, but now I've got it. I think it should work great and I won't screw up the transom.
I understand (and agree with) your concern regarding suggestions from anonymous contributors.
I participate in a few Internet forums and I've found CW to be the best in a lot of ways. I "lurked" for quite a while before becoming a member and to me there are several CW members who are "trusted agents".
Jay


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Author	Topic: Dealer Bulletin 84-10 on Engine Mounting
jimh	posted 04-11-2009 08:50 AM ET (US) I have added a new article to the REFERENCE section which reproduces the Boston Whaler publication DEALER BULLETIN 84-10. This bulletin deals with two problems encountered with engine mounting: --clearance of the lower mounting holes in the 16-foot or 17-foot hulls which have a shallow splash well, and --mounting certain OMC engines on the curved transom of 13-foot hulls. The article is located at http://continuouswave.com/whaler/reference/bulletin84-10.html This thread can be used for any follow-up questions or discussions on this topic.
Tom W Clark	posted 04-11-2009 09:52 AM ET (US) Thanks Jim. Well done.
ratherwhalering	posted 04-13-2009 02:05 PM ET (US) Jim, thanks for clearing this up for me.
Wasatch Whaler	posted 07-19-2009 08:44 AM ET (US) The Dealer Bulletin states: "...It will be necessary to angle your drill bit slightly upward to ensure these holes enter the splash well." I fully understand the concept, but in drilling a transom I want to do it right the first time and not make swiss cheese out of the transom. "Slightly angling a drill bit" is way to vague and imprecise for me. Does anyone know the correct angle to drill the lower holes on a 15' Sport so the bolts will clear the inner splash well?
Tom W Clark	posted 07-19-2009 10:57 AM ET (US) Jay, There is no official angle specification for those holes. If you want to do it right, I would not rely on any specification or advice given by anonymous contributors on the internet, go measure it yourself. I suggest you make a template of the transom cross section and splashwell. This would be easy to do with a piece of stiff sheet material. I would use some 1/8" hardboard and cut a notch representing the transom. Drop this over the transom where the bolts holes will be and scribe the shape of the splashwell so the template nests perfectly over the transom and splashwell. You can them remove the template and see exactly where the entry and exit of the lower bolt holes need to be. You will need to have your hardware in hand and have made any modification to your washers. I would not assume you necessarily need to angle the holes but it should become evident with a template.
number9	posted 07-19-2009 11:38 AM ET (US) Is there a reason this wouldn't be an option for shallow well installation? BW is known for their conservative max hp ratings. Their engine mounting height recommendations have also be conservative by many of today's practices. Why not mount the motor two holes up and then drill for the top lower hole or top of slot? You'd gain another 3/4" of clearance from the bottom of the well.
jimh	posted 07-19-2009 12:09 PM ET (US) The suggestion to drill the engine mounting holes in the transom with a non-standard vertical spacing is mentioned in the bulletin, although they suggest only 0.75-inch or one-hole equivalent.
jimh	posted 07-19-2009 12:59 PM ET (US) If you drilled the lower mounting holes in the transom for mounting the engine a minimum of two-holes-up, or 1.5-inch higher, you might find yourself with an engine that was too high. Mounting one-hole up seems like a good place to start, and also a good place to finish for many people.
Wasatch Whaler	posted 07-21-2009 10:24 AM ET (US) Tom, Thanks for your suggestion on a method to determine the appropriate angle. I had to read it over a couple of times to fully understand the technique, but now I've got it. I think it should work great and I won't screw up the transom. I understand (and agree with) your concern regarding suggestions from anonymous contributors. I participate in a few Internet forums and I've found CW to be the best in a lot of ways. I "lurked" for quite a while before becoming a member and to me there are several CW members who are "trusted agents". Jay
Wasatch Whaler	posted 07-21-2009 10:55 AM ET (US) Tom, Thanks for your suggestion on a method to determine the appropriate angle. I had to read it over a couple of times to fully understand the technique, but now I've got it. I think it should work great and I won't screw up the transom. I understand (and agree with) your concern regarding suggestions from anonymous contributors. I participate in a few Internet forums and I've found CW to be the best in a lot of ways. I "lurked" for quite a while before becoming a member and to me there are several CW members who are "trusted agents". Jay