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  Engine Mount Bolt Torque - Factory Recommendation

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Author Topic:   Engine Mount Bolt Torque - Factory Recommendation
Gene in NC posted 09-02-2003 12:09 AM ET (US)   Profile for Gene in NC   Send Email to Gene in NC  
Bigshot was right. See "Proper Torque for Motors Bracket Bolts", bobgilsp post. I'm making this post for folks like me who like a number and a source.

Boston Whaler
Chuck Bennet at BW reports:

1) "In order to install an engine w/o causing any damage to the outer layers of gelcoat/fiberglass ....tighten bolts to point where the interior washers are not compressing the gelcoat/fiberglass. This is done by feel, w/o ... torque wrench ...use lock nuts....

2) "Mercury ...does not place...engine mounting bolt torque spec. in any of the engine installation manuals."

So much for Brunswick, owner of BW and Mercury.


OMC 1982 90-140 Owners Manual

1)Use locking nuts with bolt threads lubricated with OMC Triple Guard grease and torque to 20 to 25 ft.lbs.

Note: Effective torque of lubed thread is higher than dry thread at same reading as might be the case if double nutting. Nylock nut also has some small effect.


Ed Sherman, "Outboard Engines: Maintenance....."

1) Recommends Permatex #2 Non Hardening gasket cement on all SS bolts in aluminum to prevent corrosion.

This applies to use of Perm #2 in blind holes in OMC bracket that match original lower installation holes in '66 16'7 transom with OMC engine. Use standard 1/2 13 thread bolts. Might be good idea to let cure for a few days. Chemists out there????? Comments please?

Yamaha 90 also has the blind holes (thread unknown).

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