NANO

106 ENGINE 273 MPFI • Thrust Clearance: Using a thickness measure gauge, measure the clearance as shown in fig. If the limit is exceeded, replace the camshaft or camshaft bearing caps. CAMSHAFT THRUSTCLEARANCE STANDARDVALUE LIMIT 0.1 to 0.3 mm 0.4 mm • Journal wear: Measure the journal diameter in two directions at two places to obtain four readings on each journal and check the journal bores with a bore gauge, producing four readings on each. From these readings, compute the radial clearance (Camshaft journal clearance). If the service limit is exceeded by any of the computed radial clearances, replace the camshaft as necessary, cylinder head too. JOURNALDIAMETER 26.007 mm to 26.02 mm JOURNAL ANDCAMSHAFT CLEARANCE STANDARDVALUE LIMIT 0.027 to 0.053 mm 0.1 mm Cylinder Head De-carbon cylinder head: Deposits of carbon will be found on its combustion chamber surfaces and exhaust ports. Remember, overheating tendency and loss of output are often due to excessive carbon accumulation. De-carbon valves, too. NOTE Do not use any sharp-edged tool to scrape off carbon. Be careful not to scuff or nick metal surfaces when decarbonizing. This applies to valves and valve seats, too. Distortion of gasketed surface: Using a straightedge and thickness gauge, check the flatness at a total of 6 locations. If the limit, stated below, is exceeded, correct the gasketed surface with a surface plate and abrasive paper of about # 400 (waterproof silicon carbide abrasive paper). Place the paper on and over the surface plate and rub the gasketed surface against the paper.