78 486 PL ENGINE P VALVE Valve seat insert & bore dia in cylinder head Stage Valve seat Valve seat insert bore in insert out cylinder head side diameter mm mm INLET Normal 33.6/33.625 33.6+0.128 +0.112 EXHAUST Normal 30.000/30.021 30.05+0.105 0.080 Depth of bore Thickness of in cylinder valve seat head for valve insert seat insert mm mm INLET 6+0.1 6.0 EXHAUST 6+0.1 6.0 Lubrication system Oil Pump Pressure Relief Valve : Opening pressure 7 ± 0.5 bar Flow rate measured against back pressure of 3 kg/cm2should be as follows using SAE-30 oil. Pump rpm Minimum flow rate in lpm 3725 46.5 2855 35.5 1800 22.5 800 9.3 Engine oil pressure with coolant temperature of 700C at idling speed 800+50rpm/1.2 bar at 4500rpm/3 bar PUMP TO BE LEAK TESTED AT : 8 bar. Oil Pressure Switch NC contact opening pressure 0.9/0.6 bar Cooling system Radiator : TATA TOYO Type : McCORD type aluminium brazed 2rows Number of tubes : 54 (in single row) Number of tube rows : 2 Core Height : 485 mm Width : 537.2 mm Thick : 48 mm Core Capacity : 4.3 litres (approx.) Leakage testing pressure : 1.5 bar Radiator Cap : Pressure valve opening : 1.0±0.1 kg/cm2 Vacuum valve opening : < 0.05 kg/cm2 (suction) (max) Thermostat : Start opening temperature 830 ± 20C at 0.1mm Full open temperature 950 ± 20C at 8.0mm valve travel By pass port closed at or 930C before Leakage through main valve 180 to 250Lit/hr. (including seepage hole) at room temperature and pressure of 1 kg/cm2 Maximum leakage 1.5 lpm (Max) through by-pass at full open temperature or main flow rate of 130±5 lpm Water Pump Characteristics : Water pump flow rate at back pressure of 0.1 to 0.8 bar Pump rpm Minimum flow rate in lpm 2000 59 3000 88 4000 121 4500 165
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