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Home >> Mazda >> 1978 >> Cosmo Automatic Trans >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> RX-4 & COSMO Rotary Engine >> Engine Oiling >> Pressure Regulator Valve

Pressure Regulator Valve

Mounted in rear housing, valve regulates oil pressure at high RPM. Valve opens to release oil pressure. If oil pressure is less than normal, check regulator valve piston for wear and ensure that spring free length is 1.83" (46.4 mm).

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