ENGINE 94 Fig. 4 Fig. 5 Fig. 6 Note: Since a slight clearance exist between main bearing cap dowel pins and the corresponding dowel holes in the block, it is possible for the cap once removed to be replaced off centre If measurements 'B' and 'C' are equal, the bearing cap is properly centralised. If a difference in these two measurements is noticed, the bearing cap can be centralised by lightly tapping the cap with mallet in required direction after loosening the bolts. 5 In case of very little wear only in main bearing caps, it is possible to reclaim the crankcase by facing the cap mating surface after removing the dowels. The parent bore should then be remachined to original dimensions after refitting new dowels on a suitable line boring machine or with special reamers. This is an extremely precision job and should be carried out only if proper facilities are available. Otherwise, the cylinder block should be replaced. 6 Unscrew main bearing cap bolts and remove bearing caps. iii. CYLINDER BORING AND HONING 1 Clean cylinder bores thoroughly. 2 Measure bores using internal measuring gauge fig. 5 and record readings on engine inspection sheet 1. 3 If taper and ovality of used cylinder bores is found within 0.04 mm and 0.015 mm respectively, cylinder bores can be finished by mere honing. Replace liners if cylinder bore wear exceeds these limits. REMOVAL AND INSTALLATION OF LINERS REMOVAL 1 Keep cylinder block upside down on hydraulic press such that bore from which liner is to be removed lies clear in machine table slot. 2 Ensure that the block is resting squarely on machine bed. 3 Press out liners individually using drift, 2651 5890 02 01 and a suitable distance piece between press ram and the drift. Fig 6. Make sure that the distance piece is also seating squarely between the drift and the ram. INSTALLATION 1 Clean parent bores in the block thoroughly especially for carbon in the counter bore for liner collar. 2 Place cylinder block on the hydraulic press ensuring that it is resting squarely on the press bed, and with head parting surface at the top.
RkJQdWJsaXNoZXIy MTIwNTUz