SAFARI

ENGINE 112 Fig. 5 Fig. 6 INSPECTION AND REPAIR OF VACUUM PUMP 1 Check cylinder sleeve bore for wear. 2 If wear on cylinder sleeve bore is so slight that boring and/or honing is not required, old piston can be reused. 3 Check old piston for cracks, scores, damage, etc. 4 Check fit of piston pin and condition of piston rings, ring grooves and lands. 5 Clean piston ring grooves. Install piston rings and check lateral clearances. 6 Check piston ring butt clearances. 7 If necessary, replace piston rings. 8 If wear on cylinder sleeve bore is excessive, re- machine it to next repair stage. If it is not possible to re-machine old cylinder sleeve, replace it by new one. 9 Select suitable piston for re-machined cylinder sleeve bore and install new piston rings. 10 Check camshaft eccentric for size and wear. If necessary, re-grind it to next repair size. 11 Select suitable bearing shells in accordance with camshaft eccentric size and install into connecting rod and connecting rod cap. 12 Screw connecting rod cap to connecting rod and tighten to specified torque. 13 Measure big end bearing bore of connecting rod at 3 points (about 30 deg from parting surface) with internal measuring instrument. Specified values should be maintained. 14 Unscrew connecting rod cap again. 15 Measure bore of connecting rod small end bushing for size and wear using internal measuring instrument. 16 If necessary, replace bushing by new one and ream it to correct size. DRILL OIL HOLE THROUGH BUSHING 17 Check bend and twist of connecting rod on suitable gauge by using new gudgeon pin. If necessary straighten connecting rod in cold condition. 18 Check condition of valves and replace worn out parts. If necessary, replace complete sub-assembly of cylinder head.