I've always gone 'by the book;' i.e. flatwashers and brass nuts--note the
flatwashers are thick and probably hardened--and never had a problem with
loosening. Be sure to torque properly (with no recommended torque pattern I
usually torque inside to outside).
I suspect a lockwasher might lose its springiness due to the high temps and
cycling. Note lockwashers aren't used on head studs or in other critical
applications where the strength of the joint should be determined by the
stretch on the bolt (see: 'torque-to-yield' as well).
Bob
ps. <caution: snarkiness ahead> If lockwashers were 'recommended,' the parts
book would have shown them.
--------------------------------
Bob Spidell - San Jose, CA
----- Original Message -----
From: "john spaur" <jmsdarch@sbcglobal.net>
To: healeys@autox.team.net
Sent: Friday, December 21, 2012 9:56:59 AM
Subject: [Healeys] manifold nuts
The parts book shows only plain steel washers and tall brass nuts to
attach the manifolds to the head.
Is a lock washer recommended?
I have always used them but would like to know what the best practice is.
John Spaur
'62 BT7
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