Another Y block question

O.K....So, I have this new cam, and I re-ringed/honed the pistons/bores, and back together it goes. Cool. Short block...
now, I see in the Ford nomenclature that there is a counterweight, on the cam, in the ***embly that includes the pump eccentric, etc...

I don't have that. It was not there when dis***embled
Do I REALLY need it?
Why does no other motor I've built have that?

Y blocks are weird...

 

hmmmm....Y block answers are few and far between...

 

did you try contacting john murmet ithink thats his name the guy with the y block page

 

Not sure if they are going to cause a problem if it is not there, but i do remember it on my brother's y-block. It is a thick sheet metal cup type thing with off center hole. It doesn't seem like it would weigh enough to actually do any sort of balancing. The outside sides of the cup is where the fuel pump arm would ride. You have to have it to use a mechanical pump.

 

Here it is circled in red

 

I have an eccentric, to drive the pump, but...it is showing a "counterweight" in this ***embly also...it looks( in the picture, anyway...) like a crankshaft counterweight shape, except just one, in btwn. the pump eccentric, and the thrust plate.
not sure how thick it is, can't tell from the picture in the book...

 

weird.. not sure if I remember that piece.. What year y-block are you working on? I have a '58 that was complete I could look at this weekend.

 

Looks like an EBU-6290-A. Check Mummert for availibilty.

 

Block is a '60, but, I also looked in the Merc book, for '56, and saw it there, as well...

 

Thanks...I have two other Y-blocks, in pieces, that don't seem to possess this thing either...

I didn't notice 'em on his Y-block page, but...I might have missed it...

 

The counterweight is used to offset the weight of the fuel pump eccentric. As long as the retainer plate is used an the cam gear is fastened so it would no come loose you should be OK. I can't quite remember if the stack up height will allow it. If not, you could easily machine up a spacer to take up the difference.

 

There is either a counterweight or a spacer. Basic part number is 6290 for either. Hope this pic comes through

 

HA!...money shot...
I DO happen to possess that spacer!
funny thing, I did not see this as a either/or in the literature I have...
damn books...
Thank you, kind sir!

 

Send a PM to Homespun91, he seems to know everything about y-blocks. Very informative posts from him.