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Snowcat History, Articles, Manuals, Brochures & Recollections Forum Publications, specifications, production information for snow cats

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Old 10-11-2012, 12:15 AM
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Default J5 251 flat head crysler engine manual

Does anyone have the engine manual for a 251 flat head crysler engine? Or at least the specs so I can tune it up and check the lower bearings on my J5
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Old 10-11-2012, 10:24 AM
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Default Re: J5 251 flat head crysler engine manual

Does your 251 still have the data tag on it? It would be on the right side of the block below the manifolds (can't miss it in the below photo). This would tell you what series/configuration engine it is and you can look for the right manual. Mine is a "251-8A" and I found original operation, maintenance, and overhaul manuals on e-bay for the Chrysler Industrial "8A" series. Hope that helps.
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Old 10-11-2012, 02:37 PM
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Default Re: J5 251 flat head crysler engine manual

I think my tag is gone but l will check when I get back to town. It looks similar to yours in the photo except has a different manifold config. The block is 25" long. What kind of paint and prep work did you do to make your engine so perrdy?
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Old 10-11-2012, 04:24 PM
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Default Re: J5 251 flat head crysler engine manual

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I think my tag is gone but l will check when I get back to town. It looks similar to yours in the photo except has a different manifold config. The block is 25" long. What kind of paint and prep work did you do to make your engine so perrdy?
That's the thing with the old Chrysler Industrials. I think the basic blocks were the same for a given C.I.D., but they had subtle differences in 'accessories' like manifolds, bell housings, and clutches that were used in a wide variety of applicatons like pumps and welders, thus my thought you might want to know what series your's is to get the right manuals. I rebuilt my engine and had it boiled, thus a clean slate to paint with ceramic high-temp engine paint. In my case it was "New Ford Grey" that seemed to best match the latest Tucker chassis grey and could easily be bought off-the-shelf in spray cans and in gallons.
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Old 10-11-2012, 05:18 PM
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Default Re: J5 251 flat head crysler engine manual

Here you can find specs for a '47- '51 automotive straight six, and you might actually find the manual.

http://www.secondchancegarage.com/public/574.cfm
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Old 01-25-2017, 11:39 PM
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Default Re: J5 251 flat head crysler engine manual

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Originally Posted by IMP View Post
Does anyone have the engine manual for a 251 flat head crysler engine? Or at least the specs so I can tune it up and check the lower bearings on my J5
No manual but I do have a question. I have a J5 my son just rebuilt and put a Chev 292 in. He is using the old above rad. Do you have any idea what rad cap it takes. We have the wrong one on the rad. The proper one is deeper but it would be great to have the measurement?
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Old 01-28-2017, 09:06 PM
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Default Re: J5 251 flat head crysler engine manual

Here is the cap I bought at NAPA for my original J5 radiator when I restored it a few years ago. I don't have the part number and there is no identification numbers on the cap. I vaguely remember trying several different caps until i found one that fit. Good Luck. So Now you owe us a few photos.....We want to see your rig!
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Old 03-10-2017, 10:03 PM
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Default Re: J5 251 flat head crysler engine manual

Thank you for the great photos. I will have Shawn post a bunch of his photos. It really came out great. He spent four months working on it every day. It is truly a frame of resto.
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Old 04-28-2017, 11:45 PM
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Default Re: J5 251 flat head crysler engine manual

Thanks for the rad cap info, it worked great. I will try to post some of Shawn's photos. He installed a Chevy 292 and used the Chevy transmission. We were going to use the existing transmission but the Chevy one worked easier. The window at the front was small so he made it four inches taller and the view is far better. Everything on the machine was gone over and it was painted with Endura. He redid the tracks with industrial belting. The holes were fun to drill out.

We moved the J5 40 miles over a winter trail at 30 below and it ran great. Lots of power and good heat. The larger window sure was nice. It could use a bit of sound proofing, so I guess that is next. We have a 12,000 lb winch so that will go on it as well.
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