Bowl opens by itself after long separation
Westfalia OSA 7, self-cleaning centrifugal oil separator (lube oil purifier)
Possible cause
Operating water in the sealing chamber evaporated
What to do
Manufacturer's manual, p. 63Replenish operating water at intervals with a timed solenoid valve
See the assembly on the 3D model
Other Westfalia OSA 7 faults
Bowl does not reach rated speed or takes too longBrake on, wrong motor connection, oily or worn clutch shoes, too few shoes, bowl rubbing the centripetal pump, sludge in upper frame, worm wheel slippingBowl reaches speed in under 2 minutes, high starting currentToo many clutch shoesSeparator runs unevenly / vibratesUneven sludge, wrong assembly or mixed bowl parts, slack disc stack, damaged bowl, weak neck bearing springs, broken bottom bearing spring, worn gearBowl fails to closeClogged feed ducts or discharge nozzle, dirt in opening chamber, damaged gasket in sealing-chamber bottomBowl does not open or opens only partlyToo little operating water, clogged strainer, leaking line, dirt between piston and bowl, loose polyamide gasketIncomplete de-sludgingBowl closed too soon, hardened solids, enlarged piston discharge hole, slack disc stackDirty oil at the clean oil outlet (bowl overflow)Rust and heavy impurities in the distributor neckOil in the water dischargeRegulating ring too largeWater in the clean oilRegulating ring too small
From the manufacturer's manual “NEW ME L.O PURIFIER MANUAL.PDF”. Check against the original on board before work.