The Ford Barn

Mike Mayer · 12-01-2016, 12:20 PM

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 · 12-01-2016, 12:30 PM

Rods are fine
Pistons are not

rotorwrench · 12-01-2016, 12:56 PM

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 · 12-01-2016, 01:45 PM

Thank you

Ol' Ron · 12-01-2016, 02:19 PM

How do you know it's a merc crank

Mike Mayer · 12-01-2016, 03:53 PM

Sponsored Links (Register now to hide all advertisements)

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

glennpm · 12-01-2016, 04:22 PM

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 · 12-01-2016, 07:23 PM

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 · 12-02-2016, 01:58 PM

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

12-01-2016, 12:20 PM	#1
Mike Mayer Senior Member Join Date: Aug 2010 Posts: 108	Rods 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.

12-01-2016, 12:30 PM	#2
Kahuna Senior Member Join Date: May 2010 Location: NorCal Posts: 2,617	Re: Rods Rods are fine Pistons are not

12-01-2016, 12:56 PM	#3
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,425	Re: Rods 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.

12-01-2016, 01:45 PM	#4
Mike Mayer Senior Member Join Date: Aug 2010 Posts: 108	Re: Rods Thank you

12-01-2016, 02:19 PM	#5
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,857	Re: Rods How do you know it's a merc crank

12-01-2016, 03:53 PM	#6
Mike Mayer Senior Member Join Date: Aug 2010 Posts: 108	Re: Rods Sponsored Links (Register now to hide all advertisements) the crank has 5/8 plugs and it has a stamping on it I think it is 1cm

12-01-2016, 04:22 PM	#7
glennpm Senior Member Join Date: Sep 2014 Location: Wiscasset, Maine Posts: 1,981	Re: Rods 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!!

12-01-2016, 07:23 PM	#8
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,425	Re: Rods 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.

12-02-2016, 01:58 PM	#9
Mike Mayer Senior Member Join Date: Aug 2010 Posts: 108	Re: Rods as it turns out I have Mercury pistons Thank you all for the education