[Healeys] Down pipes
Max Byers
sbyers at ec.rr.com
Wed Oct 16 19:50:46 MDT 2019
Fred, I had the same problem until I determined the correct torque to apply to the brass nuts and torqued them while the studs were hot. I torqued several used nuts until they stripped. The required torque to strip them was more than 300 lb-in. I installed new nuts and torqued them to 268 lb-in (a convenient click on my torque wrench) while they were hot as an initial test. I later increased that to 288 lb-in a year later when I replaced the gaskets, and I have had no more loosening or leakage problems.
Steve Byers
HBJ8L/36666
BJ8 Registry
AHCA Delegate at Large
Havelock, NC USA
From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Fred Wescoe
Sent: Wednesday, October 16, 2019 8:46 PM
To: healeys
Subject: [Healeys] Down pipes
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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