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Date:  7-2-2011
Number of Hours:  6.00
Manual Reference:  
Brief Description:  Oil Hoses, Air-Oil Separator and Filter Adapter

Coincident with the onset of 100+ deg temps in Oklahoma, I'd changed out the crankcase breather tube with an ACS air-oil separator. The separator didn't seem to work as it wasn't collecting any oil, and my oil temps were too high, requiring 75% power settings to avoid going over 220 deg. Pulling the power back for landing resulted in temps heading above 230 deg, in turn lowering the oil pressure below Lycoming limits at idle. So, not good. There was a mild restriction to flow in the separator, and the unit was bulky, possibly obstructing the oil cooler air flow. Anyway, I decided it needed to go. Another possible issue was my oil hose size. I'd plumbed -6 hoses, as I'd had a hard time finding any 3/8 inch pipe to AN-8 steel fittings. I hunkered down and finally found some steel Aeroquip fittings at Pegasus Racing. Bob Barrows also recommended getting rid of the oil filter adapter, and just plumbing the oil filter and cooler in series. The hose fittings on my adapter leaked despite increasing amounts of torque being put on the fittings in an attempt to stop the seepage. Using the pressure screen housing also puts an additional filteration screen in the system, and in my case, my housing doesn't have a Vernatherm, which would remove an additional failure mode. I already have a butteryfly valve on the oil cooler air inlet, so I can cut down the air flow to the cooler in cold weather.
I fabricated new -8 Aeroquip 303 oil hoses with 491 fittings and firesleeve and installed them with Aeroquip fittings and changed the oil filter; test runs at 80 deg ambient at 4000 feet showed 214 deg at 42% power and 209 deg at 75% power; no temp rise with descent to landing.
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Oil Cooler fittings.

Oil Cooler fittings.

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Top View, Pressure Housing center.

Top View, Pressure Housing center.

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Oil filter fittings.

Oil filter fittings.

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