Crank pulley torque

[HCO41]

What is the torque spec. for the crank pulley on 1950 8ba engine? I have the Ford shop manual and a Motors that covers the '50, neither specifies torque for this bolt. What's a good source for this info.?
Thanks,
Howard

[AnthonyG]

Based on the size of the thread looks like 50 ft/lbs based on a 1'2" thread. Here's a good site to keep http://www.flatheadv8.org/Torque%20Chart.pdf
Another good site to keep https://www.boltdepot.com/fastener-i...Head-Size.aspx

[Flathead Dave]

I have never torqued mine. I only tighten it. Never had a problem.

[19Fordy]

The 49-51 Mercury manual says 130-145 foot pounds for the 1950 Merc 5/8-18 x 15/16 cap screw. For 1951 Merc it says only tighten to 45-55 foot pounds. It also says that these torque values are based on lubricated thread conditions. That's quite a difference. 145 foot pounds seems awfully tight. Check the size of your bolt. I would go with the lower numbers. The Mercury Manual also shows that the 49-51 Merc uses the same size crank bolt for the years 1949-52. Mercury changed to the cast iron narrow pulley in 1951. Wonder why the torque values changed? I know yours is a 1950 engine, but they are virtually the same as a 1953. For that reason,
I would go with 45-55 foot pounds as shown here for the 1953 Ford V8. Scroll down when you get to the site below..
http://www.secondchancegarage.com/public/406.cfm

[HCO41]

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19Fordy,
That's just the information I was looking for. I haven't seen all the different applications of pulleys for this era but, I know the Ford cars used a steel pulley with a larger diameter pulley for '49, same as '48-? trucks. In '50-'53 the Ford car used the cast iron pulley with a smaller diameter. The lower torque values you recommend make sense since there's a void between the end of the crank and the front of the pulley once the pulley is seated. The torque has to taken by a .180 thick large washer, since the bolt head is smaller diameter than hole in pulley.
That's why I asked for Ford's spec. on this. I didn't think the washer would take the recommended torque for a 5/8-18 bolt in surface to surface contact applications. I do plan to use blue locktite on the threads. Thanks for all your help. I will make a copy of info. in links above.
Howard