[Healeys] Arghhhhh ...

[Bob Spidell]

Another good data point. 

A Lister--who replied to me privately--informed me that the original BN1 downpipes had a 1/4" extension into the manifold, presumably to keep the gaskets from taking the brunt of the hot exhaust gases. I think the best solution is to weld a collar into the downpipe flanges to keep exhaust gas from burning through the inside edge of the gasket. I'll use sealant and make sure the flex joints are flexing as well. 

Lots of good info from the List. I think the downpipe collar/extension is the most liable to give a lasting solution, but I'll be checking flanges, flex unions, motor mounts, and all the other suggestions. 

Thanks to all who replied, 

Bob 

-------------------------------- 
Bob Spidell - San Jose, CA 

. 

The muffler shop welded my flex sections to the muffler. Maybe your motor mounts are old and causing extra engine flex and movement that is is being transferred to the pipes.... 


On Wed, Mar 31, 2010 at 8:33 PM, WILLIAM B LAWRENCE < ynotink at msn.com > wrote: 


I wonder if the flex sections of the down pipes could be too stiff, maybe 
rusted tight. That might cause relative motion between the flanges. 
Bill Lawrence