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END 673 oil PSI regulator spring

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Anyone know of a parts supplier that might still have on oil PSI regulator spring?  Called Watts and no luck. Was able to get a part #   572GC110. 

Have the Mack specs on this spring, so if I can't find a new one I'll check it and shim to the correct height and poundage. 

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I dont know the reason for replacing the spring(s)..  , so I thought I would post some specs from my E-6,, 2 valve book..  It shows the compressed spring pressure and measurements..  I used this a couple years ago, when I was inspecting an oil pump for re-use..                    Jojo


Sorry about the crooked picture..  



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Low PSI when warmed up. My Mack manual says 29.5 lb at 3 7/8 inches. Had pan down all looked good. No sign of brg material in pan sump or in filter. Regulator spring is next easiest avenue to pursue.

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