Aviation of WWII
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Drawing Rolls-Royce Merlin 25 engine

1 Coolant outlets; 2 De-icing connection to propeller; 3 Vacuum pump inlet; 4 Vacuum pump return; 5 Engine mounting feet; 6 Oil pressure gauge connection; 7 Oil thermometer gauge connection; 8 De-icing inlet connection; 9 Coolant inlet to cylinder; 10 Dowty pump drain; 11 Oil inlet; 12 Coolant pump outlet; 13 Coolant pump inlet; 14 Starter motor terminals; 15 Supercharger bearing vent; 16 Slow-running cut-off lever; 17 Oil outlet; 18 Constant-speed propeller governor unit; 19 Wheelcase breather vent; 20 Magneto earthing connection; 21 Magneto booster coil connection; 22 Throttle control levers (alternative); 23 Boost gauge connection; 24 Cabin heater connection; 25 Haywood air compressor outlet; 26 I.A.E. pump delivery; 27 I.A.E. pump drain; 28 I.A.E. pump inlet; 29 Fuel priming connection; 30 Propeller shaft; 31 Crankcase breather; 32 Engine starting handle; 33 Fire extinguishing system inlet; 34 R.A.E. air compressor oil inlet; 35 R.A.E. air compressor air inlet; 36 R.A.E. air compressor air & oil outlet; 37 Engine-speed indicator drive; 38 R.A.E. air compressor drain; 39 Boost control cut-out lever; 40 Two-speed supercharger control; 41 Fuel pump drain; 42 Fuel pump inlet; 43 Fuel priming connection to fuel pump; 44 Oil dilution connection; 45 Fuel pressure gauge connection; 46 Lockheed pump drain; 47 Electric generator terminals; 48 Electric generator air cooling inlet; 49 Electric generator air cooling outlet;