1977/11/21 Caterpillar

New Housing And Impeller Assembly For Water Pump And Drive Group{1361}

Usage:

1693 Truck Engines ( 65B16248-up)

Description of Change: Starting with Serial Number 65B16248, a new housing and a new impeller assembly were installed in the water pump and drive group to give improved cooling for 1693 Truck Engines. The vanes of the impeller assembly were extended .125" (3.17 mm) horizontally. The depth of the housing was increased .125" (3.17 mm) to give the necessary space for the new impeller assembly.

Adaptable To: All earlier 1693 Truck Engines if both new parts are installed together.

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NOTICE

If the 9N1864 Housing and 9N1863 Impeller Assembly are not installed together, the 1N9177 Seal Assembly can be damaged or there will be too much clearance between the impeller vanes and housing face. Either can cause overheating of the cooling system which can cause engine damage.

INSTALLATION: The clearance between the impeller vanes and housing face must be .005" to .015" (0.12 mm to 0.38 mm) after the nut is tightened to between 50 and 55 lb ft (70 and 75 N·m). Hit the pulley end of the shaft with a soft (brass) hammer. Turn the impeller and check the clearance.

Caterpillar Information System:

1977/11/21 Improved Shaft Seal Material Used In All Vane-Type Hydraulic Pumps; Seal Kits Are Canceled{5055}

1977/11/21 Larger Diameter Holes Are Now Used In The Rocker Arm Shaft To Give More Oil Flow To Rocker Arm Bearings{1102}

1977/11/21 New Crankshafts Do Not Have Lightening Holes And Lubrication Passages Connected Together{1202,1219}

1977/11/21 New Elbow Between Turbocharger And Air Inlet Manifold Has Hole For Ether Starting Aid{1058,1456}

1977/11/14 New Exhaust Manifolds Made Of Stronger Material{1059}

1977/11/14 Exhaust Valves With 30° Face Angle Now Used For Parts Service{1101,1103,1105}

1977/11/14 New Electric Starting Motor Has Longer Brush Life{1453}

1977/11/07 Precision Oil Pump Bearings Now Available{1304}

1977/11/07 Improved Crankshaft Main Bearings And Connecting Rod Bearings With Higher Strength Aluminum Alloy{1203,1219,1230}

1977/11/07 Crankshaft Support Groups Are Available To Measure Bent Crankshafts{0653,1202}

1977/10/31 Some Wobble Is Acceptable In Rubber Vibration Dampers For Crankshafts{1205}

1977/10/31 With New 5P7448 Adapter, Earlier Fuel Injection Valves And Nozzles Can Be Tested And Adjusted On The 5P4150 Nozzle Testing Group{0651,1254}

1977/11/21 Add Chamfer To Cartridge Assembly Bearings To Prevent Oil Leakage{1052,1053}

1977/11/28 Reference Chart For Main And Connecting Rod Bearings{1203,1219,1230}

1977/12/05 Water Separators Needed On Machines And Engines In The Field With SMFS{1250,0336}

1977/12/05 New Oil Filter Base Has Reinforcement Around The Center To Prevent Possible Cracks{1306}

1977/12/05 Use The 5P8610 Auxiliary Fitting Group To Charge Two Suspension Cylinders At The Same Time{0690,7201}

1977/12/05 New Fuel Injection Valve Assembly Has Improved Internal Components{1254}

1977/12/12 Use Hardened Flat Washers With Diagonal-Split Hydraulic Flanges{5057,7553}

1977/12/12 New Coolant Tube And Regulator Housing Used With Water Cooled Exhaust Manifold Gives More Clearance For Hooks To Lift The Engine{1350,1355,1380}

1977/12/12 Excessive Oil Consumption Can Be Caused By Dirt In Air Inlet System Or By Flaking Of The Piston Compression Ring{1213,1215}

1977/12/19 Improved Mounting Base For Air Compressor{1065}

1977/12/19 New 5P7450 Torque Multiplier For Torque Applications Up To 1500 LB FT (2030 N·m){0614}

1977/12/19 Maintenance Instructions For Coolant Conditioner Elements{1350}