[Healeys] Down pipes

[Earl Kagna]

Fred – Kees is right.  I believe that the problem is the split washers.  The factory used a flat washer only – no lock washer at all -  along with the special tall brass nut.  The idea is that the less material there is for expansion / contraction. in that very hot environment, the less chance of problems.  I have been using a thin stainless flat washer for years on both Healeys – I’ve never had loosening problems (they need to be checked after the initial few start cycles, say 100 miles or so, and then maybe at the next service).  I’ve also never torqued the flange nuts, just tightened them hard.

As a related aside, I’ve had better success over the years with the copper faced flange gaskets.  The other type seems to blow out a bit easier.

Earl Kagna
Victoria, B.C.
BJ8, BT7 tri-carb

From: Fred Wescoe 
Sent: Wednesday, October 16, 2019 5:46 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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