What size piston to order for a Merc 140 hp inline 6?

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davidraneypt

Cadet
Joined
Jul 26, 2012
Messages
6
I need to buy a piston for my inline 6 powerhead (merc 140 hp), but I don't know what size to order. I have no history on the motor, but there are sleeves in it. Here are numbers engraved on the inside of the current damaged piston : #774-9137; 5320; ART; 12.....what does 5320, ART, and 12 mean? 774-9137 is the part number, but I am finding several different bore sizes for that part number. Thanks
 
Faztbullet

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,938
Re: What size piston to order for a Merc 140 hp inline 6?

All inline 6 motors have sleeves, measure the bore or piston skirt with mike.
 
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