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Author Topic:   Locktite for Jack Plate Fasteners

bang4dabuck posted 07-17-2009 06:19 AM ET (US)
Put a six-inch jack plate on my Katama and a 90-HP on that. Should I use Locktite on nuts on both plate to hull and motor to plate? If so, red or blue?
rtk posted 07-17-2009 07:56 AM ET (US)
I didn't use anything on my CMC jack plate install because lockwashers or locknuts were provided.
If you are going to use locktite threadlocker use the blue.
Rich
Tohsgib posted 07-17-2009 01:46 PM ET (US)
Should not need it..too many bolts have to be loosened for it to move. I actually put greese on mine so they would not weld shut.
pglein posted 07-17-2009 04:17 PM ET (US)
I would just use lock-nuts.
L H G posted 07-17-2009 05:10 PM ET (US)
The professional way to mount engines and jackplates is to use the same components that Mercury furnishes with new engines:
* Fine thread 1/2" SS bolts of correct length
* Fine thread Bronze locknuts (to eliminate the galling you can get with SS locknuts and course threaded bolts)
* Thick 1/2" washers on the boat side of the bolt
* A very small diameter 1/2" "ring" washer on the engine bracket side
Last three items are hard to find, but the fine thread bolts can be found at Ace Hardware.
No threadlocker should be used.

bang4dabuck posted 07-18-2009 07:01 AM ET (US)
I got my plate off Ebay without hardware (Rite-Hite). Pretty sure though that CMC does not use lock nuts. Got to admit I got my hardware from the Lowes stainless drawers. I will look for appropriate lock-nuts and if no luck will use Locktite blue.
L H G posted 07-20-2009 01:57 PM ET (US)
Here is once source for bolts sets for proper outboard installations:
http://www.detwilerjackplates.com/jack_plate_accessories.htm .
Tom W Clark posted 07-20-2009 03:55 PM ET (US)
What Larry refers to as "...very small diameter 'ring' washer" is more commonly known as an SAE (specification Washer). Any good hardware store will have these.
The locknuts that Mercury uses are brass, not bronze. Fine thread versions are hard to find.
Stainless steel locknuts will be a better choice for saltwater use though you need to tighten them by hand to avoid galling. Grease or anti-seize will provide additional protection against galling.
If you do not live near a good hardware store, you can always order any obscure hardware you might need from McMaster-Carr:
mcmaster.com

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Author	Topic: Locktite for Jack Plate Fasteners
bang4dabuck	posted 07-17-2009 06:19 AM ET (US) Put a six-inch jack plate on my Katama and a 90-HP on that. Should I use Locktite on nuts on both plate to hull and motor to plate? If so, red or blue?
rtk	posted 07-17-2009 07:56 AM ET (US) I didn't use anything on my CMC jack plate install because lockwashers or locknuts were provided. If you are going to use locktite threadlocker use the blue. Rich
Tohsgib	posted 07-17-2009 01:46 PM ET (US) Should not need it..too many bolts have to be loosened for it to move. I actually put greese on mine so they would not weld shut.
pglein	posted 07-17-2009 04:17 PM ET (US) I would just use lock-nuts.
L H G	posted 07-17-2009 05:10 PM ET (US) The professional way to mount engines and jackplates is to use the same components that Mercury furnishes with new engines: * Fine thread 1/2" SS bolts of correct length * Fine thread Bronze locknuts (to eliminate the galling you can get with SS locknuts and course threaded bolts) * Thick 1/2" washers on the boat side of the bolt * A very small diameter 1/2" "ring" washer on the engine bracket side Last three items are hard to find, but the fine thread bolts can be found at Ace Hardware. No threadlocker should be used.
bang4dabuck	posted 07-18-2009 07:01 AM ET (US) I got my plate off Ebay without hardware (Rite-Hite). Pretty sure though that CMC does not use lock nuts. Got to admit I got my hardware from the Lowes stainless drawers. I will look for appropriate lock-nuts and if no luck will use Locktite blue.
L H G	posted 07-20-2009 01:57 PM ET (US) Here is once source for bolts sets for proper outboard installations: http://www.detwilerjackplates.com/jack_plate_accessories.htm .
Tom W Clark	posted 07-20-2009 03:55 PM ET (US) What Larry refers to as "...very small diameter 'ring' washer" is more commonly known as an SAE (specification Washer). Any good hardware store will have these. The locknuts that Mercury uses are brass, not bronze. Fine thread versions are hard to find. Stainless steel locknuts will be a better choice for saltwater use though you need to tighten them by hand to avoid galling. Grease or anti-seize will provide additional protection against galling. If you do not live near a good hardware store, you can always order any obscure hardware you might need from McMaster-Carr: mcmaster.com