merc crank on craigslist
 

reground merc crank on Fargo, ND craigslist auto parts for $200. Not mine and no connection to it.

Re: merc crank on craigslist
 

https://fargo.craigslist.org/pts/d/d...521788229.html

I would be wary at that price.

Re: merc crank on craigslist
 

https://images.craigslist.org/00Z0Z_...t2_600x450.jpg

https://images.craigslist.org/00c0c_...t2_600x450.jpg

https://images.craigslist.org/00z0z_...t2_600x450.jpg

Re: merc crank on craigslist
 

That's a super duper deal if it's good. Of course, you would have to go there and "mike" it yourself. I bet the shipping alone would be about $100.

Re: merc crank on craigslist
 

Question for everyone. Is "1CM" as pictured in Pete's post #3 the definitive ID for a Merc crank? I have what I believe to be a Merc block that looks to be in good shape by the eye and several cranks. I'd like to find out if one of those cranks is for that block. I believe the block is a 39-42. It has markings on it and a "99" stamped on it. I can post pics if anyone is interested. Looking to sell.
Tom

Re: merc crank on craigslist
 

Just eyeballing the picture it looks to have the large cleanout plugs, and if its been ground already its a good buy.

Re: merc crank on craigslist
 

I believe that "1CM" designates a crankshaft from '51 up that has provision for the "Merc-O-Matic" transmission. The earlier crankshafts would be marked "8CM".

Re: merc crank on craigslist
 

There are a few different 4" cranks out there. Some of the Canadian 4" cranks have a "kidney bean" dimple on the front throw, so there are few different ways to tell. Easiest and surest way to tell is if the heavy bob weight is slightly over 6". If it's 5 1/2", its a 3.75" crank.

Re: merc crank on craigslist
 

I was always told the 7/16" welsh plugs indicated 4" stroke. Have I been mislead ?

Re: merc crank on craigslist
 

That is also a good way to tell. The counter weight measurement is the most absolute way to tell.

Re: merc crank on craigslist
 

I would just measure the stroke

Re: merc crank on craigslist
 

More like 5/8" ain't they?

And I think 3/8" on the 3.75" cranks.

Re: merc crank on craigslist
 

It's hard to measure the stroke of a crank on the ground.

Re: merc crank on craigslist
 

Correct. Large bob weight is the tell tale. Over 6", 4" stroke. Around 5.5", 3.75 stroke.

Re: merc crank on craigslist
 

What part of "1CM" stamped on the counterweight don't you understand?

Re: merc crank on craigslist
 

We're not just talking about this unit. Someone asked how to identify one out in the wild. We are just offering suggestions on how to do it.

Re: merc crank on craigslist
 

The CM part denotes a Merc crank. The block is the same as a Ford, and 49 to 53 are the years for the 4" stroke.
If that crank measures out and isn't cracked it is a great deal. :)