1978 mercury 115 replacement trim fill screw

Elliomcmh

Seaman
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Mar 22, 2011
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Hi, I have looked all over the Internet, and I can't seem to find a replacement trim fill screw for my 1978 mercury 115hp. Any ideas where I can find one? Thanks
 

Chris1956

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Mar 25, 2004
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27,907
Re: 1978 mercury 115 replacement trim fill screw

I would think that is a standard size screw. It is a bit short, but you should be able to find something to fit, maybe a longer bolt with a nut 1/2 way up?
 

Elliomcmh

Seaman
Joined
Mar 22, 2011
Messages
65
Re: 1978 mercury 115 replacement trim fill screw

Sorry, I don't have the P/n or s/n of my engine. I guess that would have been good information to write down before I posted my question. As soon as I get home, I can post that info. Part #2 is not the part I'm looking for, the part I'm looking for is the trim reservoir fill screw. My pump has an vertically mounted electric pump motor, two solenoids at the top, a square reservoir under the motor, a vent screw right next to the fill screw, then a manual trim knob, and four hydraulic lines below that. Sorry for the long reply, but thank you so much for your help.
 

Elliomcmh

Seaman
Joined
Mar 22, 2011
Messages
65
Re: 1978 mercury 115 replacement trim fill screw

Chris 1956- that's kind of what u was thinking. The original was a stubby, screw with a flat round head. And I believe it had an o-ring on it. Kind of like a lower unit fluid screw. Thanks so much for your help
 

Elliomcmh

Seaman
Joined
Mar 22, 2011
Messages
65
Re: 1978 mercury 115 replacement trim fill screw

Gerry, part #3 looks like the right part. I can't view the pump diagram, because I'm on my iPhone, but I might go ahead and order it anyway. Thank you for your help
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,907
Re: 1978 mercury 115 replacement trim fill screw

Gee, the screw is probably 5/16" or maybe 3/8" and course thread, likely 1/2" long.
 

Elliomcmh

Seaman
Joined
Mar 22, 2011
Messages
65
Re: 1978 mercury 115 replacement trim fill screw

Thanks for your help guys, the one I ordered fit perfectly.
 
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