Flush plug on '71 Merc 50hp

B

BigFish7

Cadet
Joined
Aug 5, 2004
Messages
13
Can anyone tell me what the flush plug is for on my 1971 50hp Merc? It s located above the vent plug on the lower unit. Thanks
 
E

emckelvy

Commander
Joined
Jan 16, 2004
Messages
2,506
Re: Flush plug on '71 Merc 50hp

So you can hook a flush fitting to it and flush fresh water thru the cooling system; it's to be used only when the motor's not running.<br /><br />A lot simpler just to flush the motor if needed on a set of 'muffs'.
 
WillyBWright

WillyBWright

Fleet Admiral
Joined
Dec 29, 2003
Messages
8,200
Re: Flush plug on '71 Merc 50hp

It's kinda like your apendix. It serves no purpose anymore, but unce upon a time it did have a function. Before hose muffs, you had to take that plug out and screw an adaptor in there that connected to a garden hose. After running in mud or saltwater you run garden hose water thru it to flush it out.
 
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