Gas cap thread compatibility

Mercury Outboard  general discussion

Gas cap thread compatibility

Postby mark 55 » Fri Aug 16, 2019 3:42 pm

Something here don’t look right!  :lol:

BUT, is it possible those vintage omc fuel caps have the same diameter and same thread size as the larger mercury green tanks? I hate to say it but tou gotta admit those old omc gas caps are more durable than the ones Carl put on the green tanks. Of course they aren’t nearly as good looking though.
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Re: Gas cap thread compatibility

Postby ctpdsr » Fri Aug 16, 2019 4:16 pm

Looks like the cap that came with my green Johnson 5hp from that era. I bet the same size. Very well made item, but I agree the red caps look way better on a Merc. Bakelite? The one item Mercury did better quality wise in my opinion was the tiller grip. You see lots of old OMC's with Schwinn bicycle grips or similar as the OEM ones got all cracky. Lot's of the old Merc grips seem to have survived intact. Maybe they saw less mileage…..


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Re: Gas cap thread compatibility

Postby dave bernard » Fri Aug 16, 2019 7:31 pm

Not the same threads as the large cap BUT Same as the smaller one.
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Re: Gas cap thread compatibility

Postby SteveC » Sat Aug 17, 2019 4:34 am

I have used the OMC cap also, and your are absolutely correct.  They are far superior to the junk caps that Mercury put on their motors.  I have painted one red before, and it doesn't look bad, and I have a cap for show if needed.  

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Re: Gas cap thread compatibility

Postby mark 55 » Sat Aug 17, 2019 9:56 pm

SteveC wrote:I have used the OMC cap also, and your are absolutely correct.  They are far superior to the junk caps that Mercury put on their motors.  I have painted one red before, and it doesn't look bad, and I have a cap for show if needed.  

Steve


That’s what I was thinking of doing Steve! Great minds think alike!  :lol:
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Re: Gas cap thread compatibility

Postby lakerat » Wed Aug 21, 2019 10:57 pm

Caps from late 40s Champions will also work, on the big ones.
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Re: Gas cap thread compatibility

Postby Tom Brockmeyer » Thu Aug 22, 2019 12:22 am

Lots of the 1940's tiller grips and gas caps seem to interchange.  I have seen the "pointy" Mercury tiller grip on lots of early (silver) Mercury engines, Scott-Atwaters, and Champions as well as on old lawn mowers.  I even have an electric "Hot Shot" cattle prod from my grandpa's truck company with a near perfect "pointy" tiller grip.
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