Alfa Romeo 33 owners manual page 170

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

GEARBOX lash and if now within specified CAUTION:. values, repeat above adjusting opera- Use only metricsystem in order to tions. avoid confusion in computations. When refitting previouslydisas- sembled parts(carriers, differential casing, bearings and crown gear), it is 5. Compute, as shown below, the essential that alsosame Aand B average value “Hm” of the four measurements picked-up as per item shims are used- or at least new ones of same thickness- and that they are 4 above and determine the thickness placed back exactly where they were of “B” shims that will have to be located at time of disassembly. fitted behind the crown gear side carrier for pre-loading of taper roller bearings. 3. Rorate crownsear as far as B = Hm- 0.20 backlash will allow and read the value shown on dial gauge. 4. Repeat the above reading on whereas 0.20 is correcting factor for GEARBOX- four different points of the crown bearing pre-loading. equally distant DIFFERENTIAL war, one from Example of computation of the four picked-up measurements: the other. CASING DISASSEMBLY HI = 1.88 H,= 1.94; Each of the four measured values must fall within the range of 0.05 to Hg= 1.90e 1. Remove rear support (Refer to: Ha= 1.96 0.10 mm(2*10-” + 4-10m3 in) . Rear Support- Disassembly). B = Hm -0.20= 2. Remove the clutch control fork 1.88+1.94+1.90+1.96 If backlash does not fall within these = - 0.20 = and then withdraw the thrust bearing values, proceed as hereafter de- 4 from the direct drive shaft (Refer to: scribed, remembering that total shim = 1.92- 0.20= 1.72 mm Group 12). thickness (A+ B) between differen- 3. With the help of a punch, tial carriers and gearbox casing must remove the clutch control fork 6. Considering that max. allowed remain constant otherwise it would tolerance is -I- 0.02 mm and that retaining pin. cause bearings pre-load to change: shims available as spare parts have a - in case backlash is below speci- thickness variation step of 0.05 mm fied value, move crowngear select the thickness nearest to the away from the pinion by de- computed value (in the above in- creasing thickness of A shims stance one would select the 1.70 mm thickness). and equally increasing that of B shims. 7. Fit selected shims behind the - in case backlash is above speci- crown gear side carrier and tighten fied value,move crown gear retaining screws to specified torque (refer to: Step 2). closer to the pinion by increas- ing thickness of A shims and decreasing that of B shims by Crown gear to pinionbacklash the same extent. Adjust crown gear to pinion backlash following the procedure hereafter When correcting shim thickness it described. should be remembered that in order to change dial gauge reading (min. 1. Rotate pinion and crown gear to distance between crown gear and carriers allow relevant bearings to settle and 4. Remove differential pinion teeth) by 0.01 mm(0.4.10-3 (Refer to: Differential Carriers- then use tool A.2.0243 to lock the in), one must move a thickness of pinion. Disassembly). 0.015 mm(0.59-10-3 in) frd m 5. Remove differential casing with Properly tighten screws of tool one side to the other. A.2.0243 on gearbox casing. crown gear (Refer to: Differential 2. Fit a centesimal dial gauge to a Casing - Disassembly). Having completed fitting of shims, magnetic base and place the gauge’s 6. Removerods and forks (Refer tighten retaining screws to specified indicating finger on the outer edge of to: Rods and Forks- Disassembly). torque (Refer to: Adjustments- How 7. Remove shafts and gears (Refer a crown gear tooth at right angles to Determine Pre-load of Differential with the tooth’s side. Casing Bearings). Double checkback- to: Shafts and Gears- Disassembly). May 1983 13-24

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