'74 Evinrude cracked drive unit "plug"

[Carusoswi]

The "bolt" that plugs one of two holes that seal the holes where you fill or drain the drive unit on my motor has a hairline crack that I suspect is the reason why my lube turns milky when I operate the motor.

I'm certain this milkiness is the result of water contamination, although I'm not certain if it causes damage or not (so for so good!).

I'd like to fix this, and have more than once purchased replacement "plugs", but, it seems they are slightly oversized or not threaded correctly. Whichever, they do not completely seal the hole, as the lube is more milky with them than if I go with the cracked "plug".

I am using that supplied washer, BTW.

I was thinking of taking a piece of rubber cut from a bicycle tire tube to put under the plug before screwing it into the hole, but, I'm thinking that I should somehow locate the OEM plug before this one splits entiresly - perhaps the bike tube would work with the replacement plugs that I've purchased.

Sorry if my terminology is wrong. The "plug" to which I refer is one of two "screws" that you back out in order to drain the drive unit and pump in new lube.

Suggestions appreciated.

Caruso

 

[emdsapmgr]

Re: '74 Evinrude cracked drive unit "plug"

Most Bombardier dealers stock both the upper and the lower drain plugs. These newer (replacement) plugs use an allan head wrench, eliminating the stripping of the screwdriver slot that occurs on the old ones.