<VV> U-joint torque

[Seth Emerson]

Whenever I am faced with a bolt - or nut - that has an unknown torque requirement, I defer to the SAE recommendations for that exact thread and fastener grade. In this case a grade 8 - You are using the proper Grade 8 fasteners here, right? Anyway, when needing the info, I just do a Google search. Here is the value for your 1/4-20 bolt with a Grade 8 fastener. (9 Ft. lbs.) The 65 corvair suffers from a problem that does not plague the later ones. The valve cover bolt and the U-joint bolt are identical - except that the U-joint bolt is a Grade 8 and the valve-cover bolt is a grade "nothing". (Actually a Grade 2) If you torque a grade nothing fastener to a grade 8 torque, it may break off during that process. If you torque a Grade 8 to the Grade Nothing torque - or, sometimes to a Grade 5 torque, it might easily back off and fall out. Remember "Sly and the Family Stone" when it comes to bolts. "Different strokes, for different folks!"
-Seth





-----Original Message-----
From: Randy (Cap'n) Hook via VirtualVairs <virtualvairs at corvair.org>
To: virtualvairs at corvair.org <virtualvairs at corvair.org>
Sent: Mon, Nov 9, 2020 11:56 am
Subject: <VV> U-joint torque

Question:  What do the 1/4 X 20 u-joint bolts on a '65 get torqued to?  I scoured the shop manual from cover to cover and couldn't find any mention of it.  When I looked in the '66 and '69 supplements it was in there for the bigger bolts.  Since I have no desire to twist off a grade 8 bolt already in the hole, I just torqued them to 7 ft. lbs. (84 in lbs.)  What does anyone else torque them to and why.  Thanks in advance.
Randy (Cap'n) Hook
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