Fun Fact

"sony1492" (sony1492) 09/02/2018 at 14:50 • Filed to: Lexus

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Sc400s had power steering and hydraulic fan oil coolers (hydro fan being the little radiator) but nothing for engine oil. The next gen uz’s had a water to oil heat exchanger.

HammerheadFistpunch > sony1492 09/02/2018 at 14:56

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hydraulic fan coolers?

a cooler for a hydraulic fan?

Dr. Zoidberg - RIP Oppo > sony1492 09/02/2018 at 14:57

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 Everytime you tear into your 1UZ, I hug my comparatively archaic 2JZ.

sony1492 > HammerheadFistpunch 09/02/2018 at 14:57

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A cooler for the fluid used in the hydraulic fan, what else would the heat exchanger be doing?

HammerheadFistpunch > sony1492 09/02/2018 at 14:58

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you’re talking about the fan clutch?  Those are sealed.

sony1492 > HammerheadFistpunch 09/02/2018 at 15:11

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The system runs on dextron 2, al ong with the powersteering.(They are seperate systems with seperate reservoirs) You can see the reservoir on the right, the system is driven by the accessory belt. If I remem ber correctly the system was used because it has less parasitic loss than a traditional fan or electric fan setup.(in 1990 when they were designing it)

HammerheadFistpunch > sony1492 09/02/2018 at 15:13

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So it’s literally a hydraulic motor? Seems crazy from an nvh standpoint. Neat. Glad my uz has a   sealed fan clutch

sony1492 > HammerheadFistpunch 09/02/2018 at 15:22

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There is no noise or vibration(besides wind motion) , electric fans are worse from a vibration standpoint. This being 1990 lexus im sure the its not a traditional pump design.

sony1492 > Dr. Zoidberg - RIP Oppo 09/02/2018 at 15:34

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But  you havnt had to tear into your 2jz so there’s that.

HammerheadFistpunch > sony1492 09/02/2018 at 15:36

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Probably gerotor since it doesn’t need a lot of torque. Crazy Toyota.