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11-45 ENGINE CYLINDER HEAD AND VALVE Main Points for Mount Mount of Piston Pin (1) Measure the following dimensions of the piston, piston pin and connecting rod; A) Length of inserting hole of the piston pin; B) Width between the keyway C) Length of piston pin D) Width of smaller end of connecting rod. (2) Calculate the dimension L by substituting the letters in the below formula with the measured dimensions: L [(A C)(B D)] / 2 (3) Insert the SST of compression bar in the piston pin and mount the conduit A at the end of compression bar. (4) Conduct the assembly in such way that the mark for forward face on the piston is in the same direction with that of the connecting rod. (5) Coat the engine oil on the outside diameter of the piston pin. (6) Encase the piston pin, connecting rod and conduit cluster assembled as Step (3) in the piston pin hole at the side with mark for forward face with conduit A. (7) Screw the guide block B in the conduit A and ensure the clearance between the guide block B and the guide block A is the value of the sum of L calculated in Step (2) plus 3 mm.. (8) Maintain the state that the mark for forward face of piston faces upwardly, and mount the piston and connecting rod cluster on the base seat of the assembler of piston pin. (9) Press in the piston pin with pressure. If the pressure force is less than the standard value, Change the piston pin and the piston cluster, or/and change the connecting rod. Standard value: 750 1750kg A piston piston pin connecting rod A B C D 7EN0432 3mm+L guide block B conduit A 7EN0433 compression bar piston pin mark for forward face mark for f o r w a r d face conduit A conduit B base seat 7EN0391 |