Hi, My '90 Golf has the original downpipe and cat converter. The ball joint between the downpipe and cat converter is loose and making a lot of noise. I've replaced the insides of the ball joint and replaced the bolts and copper nuts. It held for awhile, but the joint is leaking again. Reading on the Internet, it sounds like there is supposed to be a spring behind that nut? Is that how the joint flexes? There isn't a spring there, maybe rusted out sometime in the last 19 years?
The triangular flanges on the downpipe and cat converter are not in great shape. I'm not sure I can tighten the nut any tighter to close the joint without breaking the flange. Also why did VW design the joint so that there was one bolt on the bottom of the flange where all the tension occurs?
Any tips on how I should repair the leaking joint while retaining the same downpipe and cat converter? The cat is still in good shape, the tubes are still intact.
thanks.