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Old 03-09-2020, 03:14 PM   #1
flatrod
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Default 221/239 cranks

I have a 221 and crank is shot. I have a 239 crank with the same rear seal area, but it doesn't fit the block. What all needs to be done to use the 239? Is it practical?
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Old 03-09-2020, 05:02 PM   #2
Ol' Ron
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Default Re: 221/239 cranks

Check the main bearing diameters, Early maind were 2.398/ also the fron and center journals have to be widened about .050" A good crank shop can do it $$$$$
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Old 03-10-2020, 11:17 AM   #3
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Default Re: 221/239 cranks

Thanks Ron, any OD work needed?
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Old 03-10-2020, 12:31 PM   #4
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Default Re: 221/239 cranks

The 48 or 91A types use the small con rods too. The 99, 29, & 59A types will use the larger con rods but 8BA stuff can also be used if whittled down a bit. It might be easier to find the right crank. If it's a short snout then look for that. Same thing it its the long snout type. There are still good pre-war 221 cranks out there.

Last edited by rotorwrench; 03-13-2020 at 04:03 PM.
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Old 03-10-2020, 01:12 PM   #5
flatheadmurre
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Default Re: 221/239 cranks

Anything can be done...but it must be way cheaper to track down a crank that fits then to machine it...
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Old 03-10-2020, 01:22 PM   #6
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Default Re: 221/239 cranks

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Thanks, I will start looking for a 221 crank. I see all work in using the 239 crank now.
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Old 03-13-2020, 12:48 AM   #7
Alaska Jim
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Default Re: 221/239 cranks

It may be easy to find a 221 crank in the lower 48 states, and while there may be a few around up here, they are not easy to find in usable condition.
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Old 03-13-2020, 12:53 AM   #8
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Default Re: 221/239 cranks

I'd think a lot of people don't build 221s. So if they don't junk them there are a few out there. Might be easier.
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Old 03-13-2020, 06:26 AM   #9
JM 35 Sedan
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Default Re: 221/239 cranks

Quote:
Originally Posted by rotorwrench View Post
There are still good pre-war 221 cranks out there.
Quote:
Originally Posted by Tinker View Post
I'd think a lot of people don't build 221s. So if they don't junk them there are a few out there. Might be easier.
This is true, and since I've bought and been gifted, plus also mainly use the early, pre war 221ci engines, I have a bunch of these crank shafts sitting around that I'll never need or use, but shipping to Alaska won't be cheap.
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Old 03-13-2020, 07:09 AM   #10
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Default Re: 221/239 cranks

Flatrod, I have a NOS 221 crank. Just sent you a message.
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Old 03-13-2020, 09:33 AM   #11
Ol' Ron
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Default Re: 221/239 cranks

Just to make things clear. From Late 38. up, all crankshafts will fit. However, in the early blocks you may not be able to use the rod assemblies. For the 36LB thru early 38 the 2.398 main blocks, you have to modify the 2.498 cranks.
Yes, you can put a 4" Merc crank in a 36 LB block, but it aint easy$$$$
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Old 03-13-2020, 07:59 PM   #12
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Default Re: 221/239 cranks

Great info Ron.
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