Alfa Romeo 33 owners manual page 45

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 Dimensions relevant to each class areCylinder wall max. taper: PISTON - CYLINDER shown in: Service Data and Speci- A - B = 0.02 mm (0.00079 in) WALL FIT fications“Cylinder block” chart. Cylinder wall max. out-of-round: X - Y = 0.02 mm (0.00079 in) (1) Reset the reamer by means of a micrometer. 1. When original parts are involved, they will be selected by matching (3) Compare actual values D with nominal ones C of each size class and each cylinder wall identification letter that is stamped on cylinder then determine the cylinders walls max. wear. block upper surface to the piston that has the same letter stamped on Cylinder wall max. wear: its head or a coloured dot painted on C - D = 0.04 mm (0.00157 in) the inside of its crown, according to the following schedule: 4. If the dimensions thus estab- lished are not within tolerance, cylinders walls must be rebored Wall 8 Piston keeping in mind that three different oversize pistons are available as spareEngineidentifyingidentifying letter letter and parts; this means that the diameter of colour walls will have to be in accordance with the tolerances shown in: ServiceA - blue 1200 B - pink Data and Specifications “Cylinder block” chart. 1350 C - green (1) Mount main bearing caps on the 1500 D - yellow cylinder block and tighten screws as “Engine assembly- E - white specified in: Engine unit”. Then proceed to bore cylinder walls so as to stay within the tolerances shown in: Service Data and Speci- fications - “Cylinder block” chart. If the letter stamped on the cylinder block has been previously erased, (2) Measure the diameter at the Lapping must be performed so that matching will take place according to recommeded depth and then deter- tool marks cross each other at an the identification letter stamped on mine taper and out-of-round of angle of 9CP + 1203 the piston that needs replacing; in cylinders walls. this instance, it is advisable to make a (2) If wear does not exceed the double check and measure the specified limit but pistons and spring cylinder wall diameter. rings need replacing because of some 2. When oversize walls are used, flaws or damage, cylinders walls they will be matched to the relevant will need at least to be lapped; in this completely assembled pistons, case measure the diameter of the wails in order to identify the newnamely with compression rings and oil scraper ring, which are available as size class to which they belong and that will have to be kept in mind spare parts according to the follow- during piston fit operations, regar- ing oversize scale: G.2- 0.4 - 0.6 mm dless of the letter stamped on the (0.0078 - 0.0157 - 0.0236 in). cylinder block. Should lapping cause a size class change, cylinder wall will no longer be identifiable through the letter stamped on the cylinder block which, therefore, must be erased in order to avoid mistakes during future operations_ 01-23 May 1983

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