Or a Bypass valve. It lets the oil bypass the cooler when the oil is cold and thick. The valve is set with a 2.5 psi differential, without going to the manual.
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Bluebell
Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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