Wasserboxer Bug - Splitting header tanks

[Tony Z]

My first thought is also the cap

But I do have another idea.... what about vibration?? Is you header tank mounted on rubber mounts or straight onto the firewall?? You could be rattling the thing apart.

Try this. Make a plate to mount your tank onto. This plate... mount it to the firewall using 2 flexible rubber mounts (used for mounting small motors and pumps). Mount the plate onto thie mounts and mount the tank onto the plate. Then get some (2) rubber straps and tie them around the plate and the tank. This will allow the tank to be fairly rigid to the plate, while not recieving the vibrations from the car.

[Steve C]

Hi

The only time that I had a problem with my old car with a wasserboxer fitted was the cap.

A radiator place should be able to check the cracking pressure on the cap you have now.

Will a T25 cap fit your Golf header tank OK? I actually prefer to have a recovery system like the T25, its good for getting rid of air locks.

Steve

[Moog]

Originally Posted by Tony Z

My first thought is also the cap

But I do have another idea.... what about vibration?? Is you header tank mounted on rubber mounts or straight onto the firewall?? You could be rattling the thing apart.

Thank s for the suggestion. The header tank is standard golf that is supposed to be fixed to the body - it isn't meant to be flexi mounted. Plus if it was this then it would split at the mount of where connections are. Where these split is clearly due to overpressure, so i don't think this is it.

I have now replaced the cap with the T25 one with spout and an extra catch tank, and all now seems resolved. Must have been a faulty cap, even though it was new 500miles ago.

Ta for the advice all.