Exhaust wobble?

Post by **Multiphonikks** » Mon Jul 05, 2004 7:28 pm

A while ago I tightened Hebe's Exhaust where it joins onto the exit manifold from the engine block as it was wobbling. (a few weeks ago actually.)

Today, on doing my usual under-bonnet check, I noticed it was loose again. It would explain the sounds I'm getting (slight blowing on the exhaust)

Hebe had the exhaust fitted new a few years back (stainless steel) and there's no other problems with it. Any ideas as to what I can do to keep it tight?

Nikki

Post by **Willie** » Mon Jul 05, 2004 9:23 pm

Make sure that the exhaust clamp which you are using is the
proper type with TWO bolt fixing, not the single bolt type.
Assuming that the bell ends of the manifold and the exhaust pipe
are intact then it must be worth buying a new clamp anyway?.
A 'wobbly' joint is not so common, the usual problem is a leak at

this joint. There are several 'tips' for making a gas tight joint so
this could become a long drawn out post!! Keep us informed.

Post by **rayofleamington** » Mon Jul 05, 2004 10:46 pm

Personally speaking I think the 'wobbling exhaust' Is the hardest to cure.
Within a very short space of time the manifold, clamp and exhaust get worn away at trhe moving edges, but less worn at the areas where it is pivoting.
Then you are left with next to no chance of getting it fixed as you will not get enough clamp force in the areas that need it due to the wear.

As mentioned alrwady it is sound advice to use a cast clamp with 2 bols. If you also use the ring of annealed copper wire it will help sort out the uneven clamp force. An additional support using a steel strap from a geabox/backplate bolt to the exhaust mounted with an exhaust strap clamp.
If it happens too often you may need a new manifold as the flange will be worn.

Post by **Kevin** » Tue Jul 06, 2004 1:10 am

Also make sure you use the cast type of clamp and not the cheaper plain steel one and also wire brush the mating surfaces to remove any old jointing paste etc.

Post by **brixtonmorris** » Tue Jul 06, 2004 9:47 am

the rubber straps that support the rear of the pipe, are also important
there should be 2 of the correct length and in good condition. supporting the rear of the pipe tightly. it realy makes a difference.