[Healeys] Fwd: Down pipes

[cjerryadams at yahoo.com]

Fred,
Engine exhaust heat and engine vibration will eventually loose almost anything. Heat is biggest problem due to metal expansion. That’s why it is recommended that head bolts be retightened after run in after a few heat cycles. Thinner jam nuts are made for double nutting for just this case. Only tighten what torque spec says. The spec tables will take into account material grade, # of threads/inch and bolt dia. Torque specs are available in a number of places. 

Jerry Adams
BN 2

Sent from my iPhone

> On Oct 17, 2019, at 12:24 PM, Bob Spidell <bspidell at comcast.net> wrote:
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> 
> 
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> 
> Begin forwarded message:
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>> From: Bob Spidell <bspidell at comcast.net>
>> Date: October 17, 2019 at 8:21:17 AM PDT
>> To: Fred Wescoe <fredwescoe at gmail.com>
>> Subject: Re:  [Healeys] Down pipes
>> 
>> I tried everything: new nuts, SS studs and torquing the snot out of the nuts (snapping a stud in the process) and still they would work loose.  Finally gave up and double-nutted with mild steel nuts with high-temp anti-seize on the studs; they haven’t loosened since.
>> 
>>> On Oct 16, 2019, at 6:19 PM, Fred Wescoe <fredwescoe at gmail.com> wrote:
>>> 
>>> 
>>> Listers,
>>> 
>>> Today, I had to tighten the 6 nuts on my exhaust down pipes.  This is the second time in 2 years I have had to do this.  What is causing the nuts to work loose?  Each of the 6 studs from the exhaust manifolds has split lock washers and brass nuts on the down pipe flanges.  Each time time I have tightened the nuts, I tighten them until the nuts squeak.
>>> 
>>> What am I doing wrong and does anyone else have this issue?  What do I need to do to fix this?  The car is a 66 BJ8 with stock manifolds and down pipes.
>>> 
>>> Thanks for any advice, I'm stumped,
>>> 
>>> Fred
>>> 66 BJ8
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