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Author Topic:   Proper torque for motor's bracket bolts
bobgilsp posted 08-29-2003 11:56 AM ET (US)   Profile for bobgilsp   Send Email to bobgilsp  
When rasising (or lowering) your outboard in order to set the antiventilation plate at the correct height, what torque should you apply to the bolts that run through the transom? Wouldn't want the engine to come unbolted.
Bigshot posted 08-29-2003 12:01 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Pretty snug but don't crack the gel inside the splashwell. Anoherwords just medium tight. For it not to come lose, use nylon nuts on the bolts or double nut them.
bobgilsp posted 08-29-2003 12:08 PM ET (US)     Profile for bobgilsp  Send Email to bobgilsp     
Thanks, Bigshot. Sounds like 20ft./lbs. or thereabouts. Probably better to work by feel--whatever feels tight, but not enough to crack the gelcoat. I guess Locktite would also help to keep the nuts on with minimum torque.
JohnJ80 posted 08-30-2003 11:33 AM ET (US)     Profile for JohnJ80  Send Email to JohnJ80     
As always, its a good idea to tighten them. Run the boat for a while and recheck. If they con't loosen up (use aircraft nuts) and you didn't crack the gel coat, they are right.


Gene in NC posted 08-31-2003 03:04 PM ET (US)     Profile for Gene in NC  Send Email to Gene in NC     
GGAM, tighten engine mount bolts sorta medium tight but don't crack the gel coat. Run it a little and then retighten. If the gel coat didn't crack you did it right.

So, this is not Ga Tech engineering exam, but why can't someone share a little empirical knowledge on the foot pound equivalent of sorta medium tight. Better yet, how bout a volunteer to run up the torque to sorta medium tight, stop and record. To be a really good shipmate you could run up to gel coat crack and record that torque too..

Better yet, how bout several of those with lots of experience on their Whaler resumes, run their version of sorta medium tight and share the results.

I know: shipwright, to shiplore, to folklore, to witchcraft, to seven years before the mast, to too much. At my age, I have more than enough empirical knowledge gained the expensive way.

As the old sailor said, "I've been around the world three times, twice underwater, clmbed the Leaning Tower of Pisa and kissed the Queen of Sheeba, but I'm damned if I know the torque required to make those engine bolts sorta medium tight w/o cracking the gelcoat on '66 Sakonnet or '87 Montauk, both of which are due for engine mountings".

C'mon, pleeeese. How bout just a lida bit hep for a purty much nubie on the board who don' no nuffin bout motors. Ain't my fault the fust 1 last 37 year til I old nuff for the Als hammers to git me.

Moe posted 08-31-2003 07:20 PM ET (US)     Profile for Moe  Send Email to Moe     
bobgilsp is correct. My new 150 Sport is about 20 ft-lbs on the bottom bolts and turned slightly before clicking at 20 ft-lbs on the top bolts, after 25 hours use.
HAPPYJIM posted 08-31-2003 08:56 PM ET (US)     Profile for HAPPYJIM  Send Email to HAPPYJIM     
The manual should have torque specs for the bolts

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