recently got an air compressor single phase motor maybe 3hp anyway took the cover off and seen the cap was blown.
what causes this?
if I get another one and wire it in would it likely run?
are then any checks to see if the motor is scrap? I have a VERY basic multimeter.
pic of the capacitor. says 420v 40uf there is also a 420v 20uf cap but it looks ok.
is it fair to assume 420v is the max volt for the cap and that it will work ok at 230v?
what is the 420v rating if not?
what causes this?
if I get another one and wire it in would it likely run?
are then any checks to see if the motor is scrap? I have a VERY basic multimeter.
pic of the capacitor. says 420v 40uf there is also a 420v 20uf cap but it looks ok.
is it fair to assume 420v is the max volt for the cap and that it will work ok at 230v?
what is the 420v rating if not?
The small radial caps used in electronic circuits tend to have some fun ways of going. There's the leaking electrolyte route, (smells akin to rancid fish as soon as the soldering iron touches it), and then the canister disappearing somewhere route usually marked by the internal cap wadding being splattered all over the place inside the cabinet. A good indicator that there's a couple of pins and a plastic baseplate with the rest of the cap missing sitting somewhere on the PCB. 
