passage As mentioned in the event of a blockage within the oil cooler or its lines which would create a pressure build up in excess of 15 psi a small poppet valve located in the front pump body will be opened by the oil pressure allowing the oil to be fed directly to the converter OIL COOLER BYPASS VALVE REPLACEMENT In the event of an oil cooler bypass valve failure pry the valve retainer from the front pump body and remove and discard the bypass valve spring and retainer Inset fig 6E 58 The valve spring and retainer are serviced only as a package Use care in removing the retainer not to damage the surrounding surface of the pump body Place the new spring and valve in front pump body bore then press retainer into bore until its top edge is flush with the machined face of the front pump body Check that valve is free to operate and valve shoulders seat in bore of valve retainer NOTE The 1200 Series front pump valve body and cover embodying the cooler bypass valve and provision for cooler lines are used as service replacement parts for the Corvair Passenger Car transmission Bypass valve need not be removed for 500 700 and 900 series but cover holes must be tightly plugged CORVAIR SHOP MANUAL