GM PD4104 Air Filter Adapters

thingiverse

These adapters allow the switch to dry filters from oil bath filters on the GM 4104 bus. Three sets are required. I printed the upper in PETG and the lower in ASA with a 0.8 nozzle. Wouldn't bother printing with a 0.4 nozzle as it would take forever. Would actually use a 1.0mm nozzle if I did it again. Do not print in PLA as the heat of the engine bay will cause problems. The inner part of the oil bath housing must be removed by removing the 6 screws. These screws will be used the mount the upper adapter. I used a thin layer of silicone to seal between the adapter and the factory air filter housing. There are two different lower adapters. I used the 57mm thick ones which worked well. If the fit is too hard to get the lower pans in place the 55mm is there which should take a little less effort.Used the Super Tech 1525 filter available from Walmart but can be found at any auto parts store. This has worked well for me but don't take it as a conversion that has been tested for a million miles.