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... . . , . . ... . . . . . . . . ... . , . . . .... 2.25 LITRE PETROL AND DIESEL ENGINE Assemble pistons to connecting-rods 27. Petrol engine pistons can be fitted either way round, except those that are being refitted to their in which case they must be fitted to the connecting-rod in the same position in 28. Inscrt a circlip in side of the gudgeon pin boss and assemble the piston to connecting-rod with t h e gudgeon pin. Secure the assembly with a circlip on the opposite side of the piston. 29. Diesel engine pistons must only be fitted one way in relation to the connecting-rod. The piston must t h e point of the on the piston crown, on the same side as the lubrication hole in the connecting-rod. Assemble the piston to in the same manner as for the petrol engine. the piston and connecting-rod to one side ready for fitting to the cylinder block. It is good practice to renew connecting-rod bolts ASSEMBLE ENGINE FIT CRANKSHAFT Main bearing nip and clearance New main bearing halves are supplied with a protective fitting. 1. Fit the bearing halves in the crankcase and caps and secure the caps to the crankcase and tighten to the correct torque. Slacken the bolts on one side of the caps only and, with a feeler gauge, check t h e gap between the joint or nip must be within to (0.004 to 0.006 in). T h e bearing nip can be bearing halves available in varying thicknesses. Do not file or machine caps or saddles to achicvc the clearance. Note that the rear main bearings are wider than four. 2. T o make a final check that the clearance is correct, leave the bearing halves in the crankcase saddles and carefully lower the crankshaft into position. in turn by inserting a 0,063 (0.0025 in) shim paper between the bearing cap correct torque. If the clearance is correct, there should be a slight increase in to rotation of the crankshaft. As an alternative ‘Plastigauge’ may bc used to check the clearance in the manner as with the connecting-rod bearings. This material may also be used to determine amount of wear in used bearings and continued 15 |