The MGA With An Attitude
Relief valve and cage assembly |
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PART NO. SPL.PAGE DESCRIPTION AHH5903 TC.C.1 29 Relief valve and cage assembly -radiator -(cooling system, Twin Cam)- Com.(C)652 also 575, 613, 623, 633, 648 PMZ0308 TC.C.1 30 Screw fixing valve to bracket (2) FNZ103 TC.C.1 31 Nut for screw -(relief valve to bracket (2) LWZ203 TC.C.1 32 Washer for nut (spring) (2) AHH5906 TC.C.2 33 Bracket -valve -(cooling system, Twin Cam) Com.(E)652 also 575, 613, 623, 633, 648 -was ARH1022 HZS0404 TC.C.2 34 Screw -fixing bracket to body (2) FNZ104 TC.C.2 35 Nut for screw -(bracket to body (2) LWZ204 TC.C.2 36 Washer for nut (spring) -bracket to body (2) AHH5905 TC.C.2 37 Hose -header tank to valve -(relief, cooling system, Twin Cam)- Com.(E)652 also 575, 613, 623, 633, 648 AHH5907 TC.C.2 38 Tube -overflow -(relief valve, cooling system, Twin Cam) Com.(E)652, also 575, 613, 623, 633, 648) PCR0607 TC.C.2 39 Clip -overflow tube -(relief valve, cooling system, Twin Cam)- Com.(E)652 also 575, 613, 623, 633, 648 PMZ0306 TC.C.2 40 Screw fixing clip to body -header overflow FNZ103 TC.C.2 41 Nut for screw -clip to body PWZ103 TC.C.2 42 Washer for nut (plain) -clip to body, LWZ203 TC.C.2 43 Washer for nut (spring) -clip to body, 
 For more information about this remote colant pressure relief valve, see Twin Cam tech article TC-325. Also see ConfidentialService Memorandum MG234 There is hose clip, shown in pictures below, that is not documented in any factory literature, but does appear to be an original issue part (with no part number available). This is a simple steel ring (likely originally zinc plated) that would need to be pushed onto the hose before the hose is pushed onto the tube nipple. Two clips needed for the pressure hose between the header atnk and the remote relief valve (up to 7-psi pressure). The drain hose is open to atmosphere, so likely does not need a clip to stay in place. It is important that all of the mating parts must have correct as-original dimensions for this to work as a pressure tight push-on fitting. 
 Measurements: The pipe stubs from the valve are OD 0.31" or 7.85mm Plain rings for overflow hose - 2 per car OD = 5/8" 0.625 or 15.87 mm ID = 0.55" or 14mm (measured) It is 5/16" - 0.318" or 8.10 mm wide. The hose would be 5/16"-ID x 9/16"-OD (1/8" wall thickness), 11.5" long. A gearbox gaiter chrome ring has a bigger ID and is narrower, so no cigar there Unfortunately these Ferrules came from the factory as part of the hose, so there is no separate part number for the Ferrules. In a pinch, use any kind of constricting hose clip to secure this hose to be pressure tight. The drain hose from relief valve to body may not need any clip, as it is free drain with no pressure. |
