Installation Manual ULPOWER UL390i UL390iS 390iSAMI 390A01 Revision No: 3 Date: 2014-09-15 Page: 36 of 69Lubrication systemOil CoolerDepending on the aircraft and climatic conditions, an optional oil cooler will be necessary. Acomplete oil cooler kit is available from ULPower.The oil cooler can be connected on the interfaces of the sandwich plate with integrated thermostatwhich is situated at the front left side of the engine. Unscrew oil filter (1) and oil filter screw (2).Put the oil filter in a clean place so it can be reused - new oil filter is not provided with the oilcooler kit.The image below shows the items of the oil cooler kit and in what order they should be connected.The integrated thermostat shut of the oil flow to the oil cooler until the oil temperature reach± 80° C (176 F). This is necessary to warm up the engine quickly in winter time.Connecting oil filter sandwich plate Insert the male adaptor bits (3) together with a copper sealing ring (4) into the oil filter sandwichplate with integrated thermostat (5) and gently tighten.A torque of max. 25Nm should be sufficient to ensureproper sealing. Place the sandwich plate where you unscrewed thefilter; with the rubber seal facing towards the enginecasing. Insert the oil filter adaptor screw (6) in engine casingthrough the sandwich plate. Rotate sandwich plate to desired position and tightenscrew with spanner (again a torque of max. 25Nmshould be sufficient). Lubricate the oil seal of the filter a little and screw filteronto the sandwich plate. The filter should only betightened by hand.(1)(2)