SECTION B Technical Data Engine Date Type ...... ...... ...... ...... ...... Four Stroke - Direct Injection Nominal Bore (see Page B.2) ...... ...... ...... 3.875 in (98,43 mm) Stroke ...... ...... ...... ...... ...... 5 in (127 mm) No.  of Cylinders .. ...... ...... ...... ...... 4 Cubic Capacity .... ...... ...... ...... ...... 236 in' (3,86 litres) Compression Ratio ...... ...... ...... ...... 16: 1 Firing Order ...... ...... ...... ...... ...... 1, 3.  4, 2 Rotation ...... ...... ...... ...... ...... Left Hand (viewed from rear) Valve Tip Clearance ...... ...... ...... ...... 0.012 in (0.30 mm) cold Engine Weight ..... ...... ...... ...... ...... 1100 lb (499 kg) with Borg Warner D.D. ...... ...... ...... ...... ...... 1145 lb (519 kg) with Borg Warner Reduction ...... ...... ...... ...... ...... Gear Details of Ratings Pleasure (High Speed)    ...... ...... ...... ...... 84 bhp (62.6 kW) at 2800 rev/min Pleasure ...... ...... ...... ...... ...... 76 bhp (56.6 kW) at 2503 rev/min Commercial     ...... ...... ...... ...... ...... 69 bhp (50.7 kW) at 2250 rev/min Commercial (Heavy Duty).... ...... ...... ...... 54 bhp (40.3 kW) at 1800 rev/min De-Rating for Altitude This  is  not  usually  necessary  for  the  4.236  marine  engine.    A  small  loss  of  power  will  occur  when  temperature  and humidity conditions are particularly adverse and allowance for this should be made when designing the propeller. When  the  engine  is  required  to  operate  on  a  lake  more  than  4,000  feet  above  sea  level,  contact  Technical  Services Department, Perkins Engines Ltd., Peterborough or one of those Overseas Companies listed on Page 11. Recommended Torque Tensions Ibf ft kgf m Nm Cylinder Head Nuts or Setscrews ... ... 100 13,8 136 Connecting Rod Nuts Cadmium Plated (silver finish) ... ... ... 75 10,4 102 Phosphated (black finish)... ... ... ... 95 13,1 129 Main Bearing Setscrews (prior to Eng.  No.  236U82408)   ... ... ... 150 20,7 203 Main Bearing Setscrews (commencing Eng.  No.  236U82408) ... ... 180 2,8 244 Idler Gear Hub Setscrews. ... ... ... 30 4,1 41 Flywheel Setscrews 80 11 108 Camshaft Gear Retaining Setscrew   ... ... ... 50 6,9 68 Crankshaft Dog Nut or Retaining Screw 300 42 406 Lub.  Oil Filter Setscrews ... ... ... 30 4,2 41 Atomiser Securing Nuts 12 1.7 16 Dynamo Pulley Retaining Nut ... ... ... 20 2.8 27 Alternator Pulley Retaining Nut (7/16 in) 30 4,1 41 Alternator Pulley Retaining Nut (9/16 in) ... ... ... 30 4,1 41 Alternator Pulley Retaining Nut (5/8 in) ... ... ... 42 5,8 57 Balancer Retaining Setscrews ... ... ... 36 5,0 49 High Pressure Fuel Pipe Nuts ... ... ... 15 2,1 20 Thermostart... ... ... ... ... 10 1,4 14 Thermostart Adaptor  ... ... ... ... 10 1,4 14