NB. Repoduced with the kind permission of Bob (PH: TVRBob). Thanks again Bob!
This task should take less that half an hour.
Exhaust leaks can sometimes be elusive. The problem is that the sound of the engine and exhaust makes it very difficult to focus in on the leak using ears alone. Detecting leaks by feel can be equally difficult as exhaust systems are hot and the leak is bound to be in an inaccessible place.
A simple way to find these leaks is to create a reverse air flow with the engine shut down. The exhaust will be cold thus making it safer to handle and with the engine off it is far easier to hear where the air is leaking from.
The Method
The simple method requires a bung with a hole to be forced into the tail pipe.
A suitable bung:
It is wise to seal the edges of the bung with some tape to prevent any leaks. Attach a pipe between the hole in the bung and a compressor. If you haven't got an air compressor you'll have to find a friend and ask him/her to blow down the pipe for you! Once the pipe is under pressure it's a simple case of listening for the leak. Once you have found the general area you can use a 20/80 mix of washing up liquid to water to dab the area with a paint brush. Your leak will be exposed by telltale bubbles.
