install '82 OMC on '66: lag bolts or blind thread

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Author Topic:   install '82 OMC on '66: lag bolts or blind thread

Gene in NC posted 06-25-2003 09:01 AM ET (US)
'82 OMC has slots for lower mount bolts that are below bottom of splash well. Lag bolts in this position or use the threaded blind holes that line up with the original OMC holes in the transom?
What size/pitch bolts fit the threaded blind holes?
JBCornwell posted 06-25-2003 10:33 AM ET (US)
Use a setback or jack plate, Gene.
No new holes in the transom, no lag bolts.
Red sky at night. . .
JB
Gene in NC posted 06-25-2003 09:25 PM ET (US)
JB, are you using that rig on a 16'7"?
JBCornwell posted 06-25-2003 09:35 PM ET (US)
Yes, Gene.
I have a 2001 Suzuki DF70 on my '80 Montauk with a 4" setback plate. Looks much better than I expected and performs like a 70 isn't supposed to perform.
Red sky at night. . .
JB
JBCornwell posted 06-25-2003 09:46 PM ET (US)
You have Email. A photo of my rig.
Red sky at night. . .
JB
Gene in NC posted 08-31-2003 08:00 PM ET (US)
Will use blind threads. Common 1/2 13 stainless bolts fit. Suggest clean up on threads w die to minimize damage to threads in the eng mt.
Kingsteven18 posted 09-01-2003 11:22 AM ET (US)
I used the blind holes on an Evinrude 70 w/ the std. mtg. bolts on a '65 16'. Beautiful.
Steve Leone posted 09-01-2003 12:36 PM ET (US)
Make a template out of cardboard to line it up for pre-drilling the holes. You need to be right-on otherwise it may become a mess. Coarse 1/2in Stainless. 3 1/2in should do or 4in. Use large stainless bumper washers on the inset and some Sikaflex to seal. Steve

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Author	Topic: install '82 OMC on '66: lag bolts or blind thread
Gene in NC	posted 06-25-2003 09:01 AM ET (US) '82 OMC has slots for lower mount bolts that are below bottom of splash well. Lag bolts in this position or use the threaded blind holes that line up with the original OMC holes in the transom? What size/pitch bolts fit the threaded blind holes?
JBCornwell	posted 06-25-2003 10:33 AM ET (US) Use a setback or jack plate, Gene. No new holes in the transom, no lag bolts. Red sky at night. . . JB
Gene in NC	posted 06-25-2003 09:25 PM ET (US) JB, are you using that rig on a 16'7"?
JBCornwell	posted 06-25-2003 09:35 PM ET (US) Yes, Gene. I have a 2001 Suzuki DF70 on my '80 Montauk with a 4" setback plate. Looks much better than I expected and performs like a 70 isn't supposed to perform. Red sky at night. . . JB
JBCornwell	posted 06-25-2003 09:46 PM ET (US) You have Email. A photo of my rig. Red sky at night. . . JB
Gene in NC	posted 08-31-2003 08:00 PM ET (US) Will use blind threads. Common 1/2 13 stainless bolts fit. Suggest clean up on threads w die to minimize damage to threads in the eng mt.
Kingsteven18	posted 09-01-2003 11:22 AM ET (US) I used the blind holes on an Evinrude 70 w/ the std. mtg. bolts on a '65 16'. Beautiful.
Steve Leone	posted 09-01-2003 12:36 PM ET (US) Make a template out of cardboard to line it up for pre-drilling the holes. You need to be right-on otherwise it may become a mess. Coarse 1/2in Stainless. 3 1/2in should do or 4in. Use large stainless bumper washers on the inset and some Sikaflex to seal. Steve