merc crank on craigslist

[swedishsteel]

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

[40cpe]

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

I would be wary at that price.

[petehoovie]

Originally Posted by swedishsteel

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

[19Fordy]

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.

[tomcarman]

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

[cas3]

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

[tubman]

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".

[Tim Ayers]

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.

[pistonbroke]

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

[Tim Ayers]

Originally Posted by pistonbroke

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

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

[vincent]

I would just measure the stroke

[Mart]

Originally Posted by pistonbroke

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

More like 5/8" ain't they?

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

[Mart]

Originally Posted by vincent

I would just measure the stroke

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

[Tim Ayers]

Originally Posted by Mart

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

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

[tubman]

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

[Tim Ayers]

Originally Posted by tubman

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

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.

[Flathead]

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.