NANO

ENGINE 2 2. REPAIR DATA Valve guide length 38 mm NOTE : Other dimensions for valve guide are same as existing manual. Valve seat insert OD Normal Normal 1 Intake 34.11 x 6 34.41 x 6 Exhaust 31.51 x 6 31.81 x 6 Valve clearance ( Tappet Setting ) Intake 0.2 Exhaust 0.35 NOTE  If the Intake valve clearance found below 0.1±0.025 mm, then adjust the valve clearance to 0.2±0.025 mm by replacing respective shims.  If the Exhaust valve clearance found below 0.2±0.025 mm, then adjust the valve clearance to 0.35±0.025 mm by replacing respective shims. Selection of shim Step 1: Put master shim of thickness 3 mm on all a valves retainers. Put tappet and cam shaft over it. Step 2: Rotate the cam shaft and bring it to TDC position. Then measure the clearance between tappet and cam shaft lobe for inlet valve with the help of feeler gauge. Note down the clearances. Step 3: Remove the TDC plate and again rotate the camshaft and bring it to TDC position. Measure the clearance between tappet and cam shaft lobe for exhaust valve with the help of feeler gauge. Note down the clearances. Calculations of shim: Use the following formulae for selection of shim. For inlet valve : S = M + (C – 0.2) For exhaust valve: S = M + (C – 0.35) S = Required shim thickness M = Thickness of master shim i.e. 3 mm C= valve clearance measured with the feeler gauge when master shim is placed on valve retainer. Step 4: Remove the master shim from retainer. Select proper shim as per calculation from shim box. A. BELT TENSION VALUES Alternator belt : New belt to be re-tensioned to 155±5 Hz on vehicle after running for 15 min. For used belt it should be 120 ~ 130 Hz. AC compressor belt : New belt to be re-tensioned to 180±5 Hz on vehicle after running for 15 min. For used belt it should be 145 ~ 155 Hz. Timing belt : Belt tension values should be 70±5 Hz measured between the span of crank gear and timing gear .