PilotJunkie_87 wrote:
I posted about my pilot possibly having a lean condition caused by an air leak the other day so I have the exhaust and carb off getting ready to do a leak down test. Is there a link somewhere on the site of exactly how to do that. Also is there a difference between a vacuum test and a leak down test?
There are no dumb questions. Everyone here to help.
Below pdf of that unit.
Don't know if a post was ever made EXACTLY how to do it but it is straight foreword.
The leak down test is a combination of a pressure test and then a separate vacuum test. I bet there is only two or three guys here who ever do the vacuum test. Most only do the pressure test and call it a day. You do not have to do the vacuum test. I do it to confirm the double lip seal on the crank is good. That seal has to seal both ways because of the design of these engines. The way I do my vacuum test is I use the same rig as the pressure test. I just hook up a suction gun and check valve to the port where you would normally put pressure in. If I find a link to mine I will post.