You heard this over the engine? Hard to quantify but no grinding noise should be present. Since they are a reciprocating compressor, there is some noise. There is an 1/8" pipe plug on the left, as viewed from the front. The Dart oil level is between 1 5/6" and 2 1/8". Of course, you have to discharge the system and then subsequently evacuate and recharge.
The clutch on the RV2 draws 2.7 to 3.3 amp for the copper wire Warner clutch, 4 to 4.6 amp for the aluminum wire version (coil housing has "AL" letters). These are the ones where the pulley OD is larger than the clutch. The Pitts clutch version is 3.3 to 4.2 amp (pulley OD same as the housing). Oil and dust in the housing can cause a slightly higher draw, and sometimes an audible hum.
