Old Inline 6 Piston size

Dreworr123

Seaman Apprentice
Joined
Jun 15, 2010
Messages
41
Hello,
I have a 1961 Merc 800 fgs. It needs new pistons. I measured the pistons to 2.737". Bore 2.748". I found a set but they say 2.750 standard. Are they saying the piston is for a standard 2.750 bore? Or is the piston actually 2.750? I might just be over thinking this but I also don't like wasting money.
 

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,921
Re: Old Inline 6 Piston size

Piston size is measured at skirt as they are smaller by the ring lands....
 

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,921
Re: Old Inline 6 Piston size

Spec's for that engine are: OD above ring land 2.736.....OD at skirt 2.741.....cylinder finish hone ID 2.751. Your mike may be off or your measuring to low ,must be 1/2 " above skirt
 
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