leaking Exhaust brake flange

[Pokey]

After having my engine installed I now find that my exhaust brake isn't working due to a leak. This is occurring around the join between the flange and the unit itself. Can I fit a gasket to this or use some sort of silicone exhaust gasket maker to seal this? It will be under pressure from the use of the brake. i have taken it apart and given it a good clean up, removed any bits that might be causing a problem. below are some pics of the join. Thanks for your advice.

IMG_0206.JPG

IMG_0205.JPG

[Newcastle George]

I tried, unsuccessfully, to install mine using the same method, and reverted to having two sections of pipe welded to the butterfly housing.

George

[Pokey]

It does work with this fitting because it was working when first fitted. but after the engine rebuild it isn't fully sealing. Might be just a change in the angles or something, I don't know but When the did the engine it first leaked at the join to the manifold. Fabricated a collar for that and eradicated the seal. Then it leaked at the brake, tightened it as far as they were game to but still leaking and with these any leak means it doesn't work.

[T1 Terry]

A product called "Maniseal" on the flanges, smooth with a wet finger, tighten the bolts, run the engine without the exhaust brake applied for 5 mins, let it cool, now try the exhaust brake and see if that fixed the problem. These type of exhaust brakes need the pipes to be level and in alignment, straight in and out, the pies must be supported both sides so they can't move and loosen the contact joint at the faces. Generally the exhaust pipe is braced to the gearbox just before the exhaust brake so the whole pipe moves with the motor as it rolls from side to side, without that brace the flanges will leak again after a very short time

[jon_d]

Pokey

Looking at the photo, the bolts are not perpendicular to the pipe,
so, they'd be pulling down on one side only.

Try making the bolts parallel with the pipe then pull them down evenly.



Also, mine has some very thin, soft, metal gaskets.

I've thought you could use about 6-10 sheets of aluminium/tin foil laid on top of each other with the hole cut out as a gasket. It will compress into the flange.

jd

[T1 Terry]

Pokey

Looking at the photo, the bolts are not perpendicular to the pipe,
so, they'd be pulling down on one side only.

Try making the bolts parallel with the pipe then pull them down evenly.



Also, mine has some very thin, soft, metal gaskets.

I've thought you could use about 6-10 sheets of aluminium/tin foil laid on top of each other with the hole cut out as a gasket. It will compress into the flange.

jd

At a closer look, you can also see the flanges are not pulled up evenly, the bottom has been tightened more than the top leaving a greater gap around the edge away from the exhaust brake actuator and that will most definitely cause it to leak.

[Pokey]

The pic is taken with the manifold gasses coming from the left hand side.If there is a gap on the right it won't affect the operation of the brake as it will only be gas that has passed through the butterfly valve. I think I will find that the variance is from a badly aimed camera and not anything else, but will check before I use the maniseal to see if it can be fixed. When I left the workshop where the engine was fitted it was fitted by the boss and his mechanic and they had pulled it up as tight as they dared without bending the flanges themselves and it was leaking. I pulled it apart, cleaned it up with a wire brush etc and repositioned it and drew it up on both sides. Will disassemble again and try it with maniseal. A PITA exercise with only 2 hands.

Thanks for the advice guys