CORE AS. 4W4987 - Caterpillar

(1) Free motion (backlash) between idler gear and crankshaft gear ... .000 to .012 in.(0.0 to 0.3 mm)(2) Bore in idler gear bearing ... 1.5015 .0019 in.(38.138 0.048 mm) Diameter of idler gear shaft ... 1.4977 .0005 in.(38.042 0.013 mm)(3) Thickness of oil pump body ... 2.5050 .0003 in.(63.627 0.008 mm) Thickness of oil pump gears ... 2.5000 .0005 in.(63.500 0.013 mm)End clearance between oil pump gears and cover (new) ... .0042 to .0058 in.(0.107 to 0.147 mm)(4) Free motion (backlash) between idler and driven gears ... .002 to .014 in.(0.05 to 0.36 mm)(5) Diameter of drive and driven shafts ... 1.2497 .0003 in.(31.742 0.008 mm) Bore in the bearings for the drive and driven shafts ... 1.2524 .0005 in.(31.811 0.013 mm) Install the bearings in the 5S1551 Cover so the oil holes in the bearings are in alignment with the oil holes in the 5S1551 Cover. Install the bearings in the 5S1559 Cover so that the bearing junctions (joints) are in the position shown.(6) Torque for retaining nut of drive gear (tighten to install cotter pin) ... 100 lb.ft.(136 N m) Rotation of pump must be free when turned by hand.(7) Put 7M7260 Liquid Gasket on surface of oil pump body before cover is installed.(8) 6N1320 Spring for relief valve: Length under test force ... 4.64 in.(117.9 mm)Test force ... 130 10 lb.(59.0 4.54 kg)Free length after test ... 5.51 in.(139.95 mm)Outside diameter ... 1.063 in.(27.0 mm)Install one .1200 in. (3.048 mm) thick T841 Washer with the 6N1320 Spring in the oil pump. This combination gives the most oil pressure for this pump.If 6N1320 Spring is not available use 2S2760 Spring with .1200 in. (3.048 mm) thick T841 Washer.2S2760 Spring for pressure relief valve:Length under test force ... 4.64 in.(117.9 mm)Test force ... 110 5.5 lb.(49.9 2.5 kg)Free length after test ... 6.02 in.(152.9 mm)Outside diameter ... 1.063 in.(27.0 mm)