User manual FIAT 127

[. . . ] Fiat 127 3 1049 cm opis části servisního manuálu Fiat 127 Internet Fan Club (http://fiat127. okruhy. cz) Fiat 127 - 1050 Supplement Contents Introduction . . . 3 1049 cc engine - general Crankshaft - refitting Piston rings - refitting Pistons and connecting rods - reassembly Pistons - refitting Connecting rods to crankshaft - reassembly Oil pump - reassembly Crankshaft oil seals and carriers - refitting Sump - refitting Auxiliary shaft and seal - refitting Belt - pulleys and tensioner - refitting Cylinder head and valve gear - reassembly Distributor - refitting Toothed drive belt - removal, refitting and adjusting Valve clearances - adjustment Engine - final assembly Engine removal – 127 Special and 127 from chassis number 1104290 onwards Fuel system . . . Carburettors - general Weber or Solex single venturi carburettors Weber dual venturi carburettor Carburettor overhaul - general Ignition system. . . Automatic centrifugal advance curves Braking system. . . [. . . ] 56 Fit the camshaft toothed driving pulley with its bolt and washer. Leave the final tightening until the drivebelt is fitted (photo). 57 Check the valve clearances; the camshaft can be turned by a spanner on the pulley retaining bolt. Readjust any clearance if necessary, as described later in this Section. 58 Owing to the small clearance between a piston at TDC and the open valves during exhaust/inlet overlap, it is imperative to get the crankshaft and camshaft in their correct related positions before turning the engine after fitting the cylinder head. If this relationship is out then serious damage could be done to the valves or pistons by turning the crankshaft, as the pistons will impinge on the valve heads. To avoid this the following sequence should be observed. Set the crankshaft as described in paragraph 59, and the camshaft (before assembling the cylinder head to the block) also as described in paragraph 59. Fit the head to the block taking care not to disturb the set positions and, finally, fit the toothed drivebelt. Then the crankshaft can be turned with no likelihood of damage. 59 Set the crankshaft by using a spanner on the pulley retaining nut and aligning the mark on the pulley with the long pointer on the timing indicator bracket. Then set the camshaft by aligning the hole in the camshaft pulley with the cast ridge on the top of the camshaft seal carrier just behind the toothed pulley (photo). 60 Fit a new cylinder head gasket with the word ALTO upwards (photo). Do not use grease or any other jointing compound. 61 Taking care not to disturb the crankshaft or camshaft lower the cylinder head onto the block (photo). 62 Fit the thick washers to the studs on the manifold side of the block followed by the nuts. Fit the bolts with their thick washers to the other side of the block and screw the bolts and nuts down to lightly compress the gasket. The bolts and nuts must now be torque loaded by stages (see Specifications) in sequence, to the specified load and in the order shown in Fig. 13. 3. This may present some difficulty as, owing to the shape of the cylinder head, it is not possible to get a socket spanner fitted to a torque wrench over the cylinder head nuts. These can be tightened using a ring or openended spanner as an extension to the torque wrench, but then, of course, the applied torque will be different to the torque registered or set on the torque wrench. To overcome this a simple calculation can be made so that a setting can be established for the torque wrench which, with an extension, will produce the specified torque loading. This value varies with the ratio of the Fig. 1049 cc engine cylinder head nut and bolt tightening sequence (Sec. 3) 24/34 Fiat 127 Internet Fan Club (http://fiat127. okruhy. cz) Fiat 127 - 1050 3. 50 Position the camshaft in the cylinder head … 3. 51 …and fit the half bearings and bridge plates 3. 53 Fit the camshaft seal in its carrier to the cylinder head. 3. 54 …followed by the drive belt quard backplate 3. 56 Fit the camshaft toothed pulley 3. 59 Hole in pulley aligned with část ridge, view from behind the wheel 25/34 Fiat 127 Internet Fan Club (http://fiat127. okruhy. cz) Fiat 127 - 1050 extension length and the torque wrench length and is calculated by using the formula: where A is the specified torque loading (Ibf ft or kgf m), B is the torque to be set, or read, when using an extension (Ibf ft or kgf m), y is the length of extension (ft or m), and z is the length of torque wrench (ft or m). [. . . ] 9 Refitting is a reversal of removal, but use a new flange mounting gasket Dismantling and adjustment 10 Clean the outside of the carburettor, remove the top cover screws and lift off the cover. 12 Any jets or bleed screws if removed, should only be cleaned by blowing air through them. Never probe with wire or their calibration will be ruined. 13 Check the float level by holding the carburettor cover vertically so that the float hangs down, and then measure between the casting flange and the nearest point of the float. [. . . ]