Dan Thomas
Touchdown! Greaser!
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Dan Thomas
They should be good for several thousand hours, but in the flight school with its frequent primes and starts, I'd find them clogging up after maybe 2000 hours.How long do the nozzles last? What about the labor to replace them?
Quick and easy to replace in most cases. Undo the tube nut, back out the primer (1/8" NPT), screw in new nozzle and reconnect the tube.
https://www.aircraftspruce.com/catalog/hapages/primperfittingsan4022-1.php
There's a 90° angled version you'll find on the carbureted O-470s, common in airplanes like the 180 and older 182s. It shoots the prime into the aft end of the intake runners. We had a hard-to-start 180 come in for an annual, and I found AN822-2D elbows in the runners. The primer was just pouring fuel into them, no atomization at all. One has to wonder sometimes...