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MGA Part Numbers - AHH5904
Blanking Cap for heaader tank -late production MGA Twin Cam

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,

The AHH5904 Cap is to be installed on the AEH593 header tank when the remote pressure relief valve is used. This cap is similar to a pressure relief cap, except that it is completely sealed and does not incorporate any pressure relief mechanism.
Blanking pressure cap Blanking pressure cap>
MGA Twin Cam pressure relief valve installation Hose -header tank to valve
The AHH5905 Hose is item 37 in the drawing illustration. It connects the header tank filler neck to the remote pressure relief valve. As original, this hose would include two zinc plated steel tubular ferrules that serve as hose clips. The ferrules must be installed on the hose before the hose is pushed onto the tube fittings.
Hose -header tank to valve Hose -header tank to valve Hose -header tank to valve
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.

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