Flow directions in engine cooling hoses (both early and B-series engines)
The top four indicate the engine coolant and raw water cooling water flow for the B-series M-25XPB, M-35B engines.
The coolant loops on the earlier engines (M-25/XP/XPA, M35/A) are identical (bottom schematic,) except that the hoses are in somewhat different locations.
M-25XPB engine shown
Cooling loops for earler engines:
--KWKloeber 2 February 2019