- Joined
- Feb 7, 2013
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- 2,486
My compressor is a 30 gallon Sanborn. Other possible leak sources would be the pressure switch diaphragm or the manual pressure release. A pinhole in the diaphragm or a bad gasket would be hard to spot. Other possibilities are the main pressure gauge or the pressure regulator. Again, internal leaks would be hard to spot.
An 80 gallon tank holds about 10 cu. ft. or some 100 cu.ft. of uncompressed air. A leak down time of 50 hrs. would be around 2 cu. ft./hr. which is a fairly substantial leak. I would use a mechanic's stethoscope to try to locate the leak. Not having a stethoscope, a length of flexible tubing will work.
This morning I leak tested the output line by putting an MT 3 taper dead center over the hole and spraying it with soapy water, no leaking there.
Also, I disassembled the overpressure spillover for inspection and cleaning, all seemed OK there. Also, I took Jack's
recommendation and tightened the 6 Phillips on the bottom of the pressure switch assembly. It's up to pressure now at
165 pounds so will go out to the shop again and listen with some flexible tubing. Time will tell if it's leaking as it has been cycling about twice a day
with no usage...