[Healeys] Down pipes

[Max Byers]

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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