Alfa Romeo 33 owners manual page 44

text version of content this owner's manual page from owners manual to the vehicle Alfa Romeo 33, year of production 1983 - 1995:

ENGINE MAIN MECHANICAL UNIT MAIN micrometer. For relevant dimensions AND CONNECTING and tolerances see: Service Data and ROD BEARINGS Specifications - “Piston” chart. Thoroughly clean the main and connecting rod bearings and visually check them for scores as well as for any evidence of seizure. In case of excess wear, replace all bearings. When fitting connecting rod bearings to the crankshaft, be sure to use matching parts, i.e. belonging to the same size class; for this purpose they are identified by same colour4. In case the connecting rod dots on the side of the half-bearingpiston assembly has been disassem- and on the relevant crank pin of thebled, check the piston pin seats shaft. Applicable dimensions andon the connecting rod small end as tolerances are shown in: Service Datawell as on the piston pin bosses for and Specifications “Connecting rodexcess wear. bearings” and“Main bearings” 5. Should parts not be replaced and Surface grinding must be performed charts. therefore used again, remember that in accordance with the roughness, working surfaces- especially that of flatness and. parallelism tolerances the piston pin seat on the piston- shown in the above chart. must be totally free of any scores, even the slightest one. CYLINDER BLOCK 1. Visually check cylinder block The piston pin must always be replaced. for cracks or excess wear of sliding surfaces. 2. Check cylinder walls surfaces for FLYWHEEL roughness. PISTONS AND Max. allowed roughness of cylinder‘ CONNECTING RODS wall surface 1. Verify that teeth of gear are not 0.5 + 1 pm (20,10*” + 39.10m6 in) in any way chipped or- show any 1. Visually check pistons and con- evidence of pitting; contrarywise, necting rods for cracks, scores and3. See to which size class the evidence of excess wear. replace the flywheel. cylinder walls refer to and then 2. Check the clutch driven plate 2. Measure the play between the proceed to check them by measuring contact surface on the flywheel for rings and their seats in the piston. them. CylintJer walls are selected any scores,chips or evidence of For relevant dimensions and toler- according to their inner diameter and overheating. Before doing so, how- ances see: Service Data and Speci- are divided into five different classes: ever, make sure that the contact fications - “Pistons” and “PistonA, B, C, D, and E. The class iden- Rings” charts. surface has not been previously tifying letters are stamped on the ground and that the amount of cylinder block upper surface next to material. available for removal is each wall location. going to be sufficient for elimination of the existing flaws. For this purpose, verify that dimen- sion “b” shown in the chart is greater than the min. specified limit and that the removable stock will allow surfacing as required. Min. limit of dimension “b” 20.95 mm (0.8248 in) 3. Check piston diameter with a May 1983 01-22

owners manual Alfa Romeo 33

owners manual Alfa Romeo 33 - year of production: 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995 - Alfa Romeo 33 owners manual EN