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mark larbalestrier
08-30-2006, 04:26 AM
Hopefully someone can help , I just got heads back from machine shop . The sparkplug threads were bad so I had helicoils installed , I noticed after 2 times out with boat that I am getting some seapage out of the sparkplug area . I retorqued the plugs the second time and the problem is still there .
terry taylor
09-01-2006, 05:50 PM
HI. If plug has been re and re. more than once gasket is flattened. try new ring gasket,or even double up gasket [2] you can spin gaskets on and off on plugs thanks.
riverrunner114
09-01-2006, 06:57 PM
Hopefully someone can help , I just got heads back from machine shop . The sparkplug threads were bad so I had helicoils installed , I noticed after 2 times out with boat that I am getting some seapage out of the sparkplug area . I retorqued the plugs the second time and the problem is still there .

you can also use a non drying pipe thread sealant avalible at hardware stores. be very sparinly with it. The seapage is probably coming from in between the helicoil and the head threads. a small amount of sealer should stop it. good luck, john
Lockjaw
09-01-2006, 10:38 PM
You could also try some copper anti seize.
riverrunner114
09-02-2006, 07:11 AM
You could also try some copper anti seize.

what happens when you mix copper and aluminum... anyone?
Bsprout
09-05-2006, 07:04 PM
I dont know but im interested!:confused:
riverrunner114
09-05-2006, 08:09 PM
Its why we don't use standard (copper inriched) bottom paints on outdrives (aluminum). you also have to be carefull with some of the anti-sieze products on your bolts going into aluminum blocks..will eat the treads away.

http://www.finishing.com/78/97.shtml

http://www.fourseasonsroofingandsiding.com/mixmetals.htm

a couple of seconds on google found these comments... its not on boats, but the rules are the same.

Electrolysis takes place, and the aluminum is the looser. I did a small study on the subject back in high school chemistry.

Edit: in some instances copper and aluminum are ok and even fused together, but not usually ok in contact with water, especially salt water.
Lockjaw
09-05-2006, 09:12 PM
Been using it on my Nissan Z head for years, and it is a highly pressurized environment if you know what I mean. So far, no plugs blown through the hood.

If worried about copper suspended in anti seize, use the regular kind. :cool:
riverrunner114
09-06-2006, 07:08 AM
Been using it on my Nissan Z head for years, and it is a highly pressurized environment if you know what I mean. So far, no plugs blown through the hood.

If worried about copper suspended in anti seize, use the regular kind. :cool:

not worried, I dont use it:D