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Author Topic:   Bolting Johnson to Montauk.
TrackerDave posted 07-07-2004 11:54 PM ET (US)   Profile for TrackerDave   Send Email to TrackerDave  
I have a 1972 Whaler that I am putting an 85 hp. Johnson
outboard on (model year 1985). My question is what height is
the ideal height to mount the motor? If I were to mount the
motor with the top of the transom touching the U of the bracket the thru bolts would not be exposed. Also, should I
use a sealant when installing the mounting bolts? Thank you
for any information on the subject.
greyg8r posted 07-08-2004 10:01 AM ET (US)     Profile for greyg8r    

I am not sure what you mean about the through bolts not being exposed. Is the transom pre-drilled and the bolt holes on the Johnson don't line up?

I have a 1974 Katama (same 16'7" hull as yours) with a 1982 Evinrude 90, which I think is the same as yours. My engine is mounted so that it sits about 1" above the transom and the anti-cavitation plate is level with the bottom of the hull and my boat has good acceleration and tops out at a very respectable 43 mph with a 17" prop. Many other forum members recommend raising the engine so that the ACP sits about 1" or 2" above the bottom of the hull.

And, yes, you want to use copious sealant. I used 3M 5200 to seal the bolt holes, but others have used 3M 4200 and marine silicone.

Hope this helps.


Legobusier posted 07-08-2004 10:05 AM ET (US)     Profile for Legobusier  Send Email to Legobusier     
Post subject sounds painful.

(sorry, couldn't resist).

Bigshot posted 07-08-2004 11:33 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
He means the blind holes. Raise it up 2" as suggested if you can. If there are already holes then do what you have to do or get a manual jack plate(what I did) so you can mount it higher. I would rather drill through the plate then fill and redrill holes in the hull.

PS...last year for the 85hp was 1980. If it is not all white she is 1976 or earlier.

jimh posted 07-08-2004 12:49 PM ET (US)     Profile for jimh  Send Email to jimh     
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