Hi George
The early leyland engines have the oil tanks mounted on the hull between the brake rest and fuel tanks. (painted yellow in previous photo) They also have the oil coolers mounted above the fuel tanks to the upper hull. all conecting piping is copper pipe.
The E170/171 motors have the oil tank mouned on the starter motor perch bracket. and the oil coolers mounted on the timming case end of the engine pack. This allowed for a much larger fuel tank as can be seen in the above photos.
I will get you some more details tommorrow.
Kind regards
Matt
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