Rods

[Mike Mayer]

I have just picked up a8BA Block with a mercury crank this motor is apart . Included in the mix is a full set of 8BA pistons and rods . my Question is are they compatible ? Thank you in advance.

 

[Kahuna]

Rods are fine
Pistons are not

 

[rotorwrench]

Kahuna has it. The wrist pin is located in a different position for the 8BA type rods they share so they will have proper piston to cylinder head clearance.

 

[Mike Mayer]

Thank you

 

[Ol' Ron]

How do you know it's a merc crank

 

[Mike Mayer]

the crank has 5/8 plugs and it has a stamping on it I think it is 1cm

 

[glennpm]

I saved a copy of this great link on identifying the mercury crank.

http://flatheadv8.org/boomer/crank.htm

I was lucky and bought mine many years ago from a great guy ... thanks Ol' Ron!!

 

[rotorwrench]

The 1CM would indicate the crank that came out for the Merc-O-Matic in the 1951 model year. The earlier ones weren't marked. On them, a person had to go by the characteristics of the clean out bores and the width of the counterweight cheeks or the throw of the crank pins if you have a way to check them.

 

[Mike Mayer]

as it turns out I have Mercury pistons Thank you all for the education