New Air Compressor Crankshaft Has Improved Spline Lubrication{1803}
Usage:
3176 Truck Engines
Description of Change: A new crankshaft is now being used for the air compressor. The new crankshaft has an orifice (1) to direct a jet of oil to the crankshaft drive splines. The former crankshaft relied on splash lubrication for the spline. The splash lubrication was insufficient, resulting in premature crankshaft spline wear. Spline wear causes excessive front gear train noise while the air compressor is building pressure.
Adaptable To: The new 4P2974 Crankshaft Assembly is a direct replacement for the former 7N7438 Crankshaft and is adaptable to earlier 9Y9159 Air Compressors. The new crankshaft assembly is effective with 2YG8551.
New 4P2974 Crankshaft Assembly.
Caterpillar Information System:
1990/11/26 Improved Fuel Injection Pump Groups Have New Injector Groups{1290}
1990/11/26 New Shim Improves Low Idle Stability Of Governor{1265,1256}
1990/11/19 Planetary Housing Requires Two Ball Plugs{3160}
1990/11/19 New 4C6715 Silicone Compound Available For Components Where Centrifugal Force Is Present{4465,4466,4472,4473}
1990/11/19 Field Replacement Of Spacer To Correct Possible Sticking In Woodward 3161 Governor Electric Shutoff Group{1264}
1990/11/19 New Camshaft Has Improved Wear Resistance{1210,1209}
1990/11/19 New Roller Camshaft Used{1209,1210}
1990/11/19 Use Only Stainless Steel Cylinder Liner Shims To Salvage Damaged 4.75" Bore Cylinder Blocks{1201,1216,1217}
1990/11/19 Check Engine Speed Sensor And/Or Crank Angle Sensor (Magnetic Pickups) For Fouling{1912,1900,1907,7529}
1990/11/19 Correct Procedures For Starting, Stopping And Transporting A Product With A Turbocharged Engine{1052}
1990/11/19 New Caterpillar Battery Warranty Statement, SELF5124{1401,7780}
1990/11/19 Diagnostic Connector Used To Determine Starter Problems; Starter Monitor Unit Can Be Fabricated{0710,1408,1416,1426,1467,1553}
1990/11/26 Service Tips For Piston Cooling Jets (Tubes){1331}
1990/11/26 Use Status Screen On Electronic Control Analyzer Programmer (ECAP) When Checking The Calibration Of The Timing And Rack Sensors; Correction To Systems Operation, Testing & Adjusting for 3406B (PEEC) Diesel Truck Engine, Form SENR3485-01{1905,1911
1990/11/26 New Oil Pressure Sender Assembly Improves Accuracy Of Oil Pressure Indicator{7455}
1990/11/26 New Expansion Tank Used{1354}
1990/12/10 New Caterpillar Warranty Statement For Ground Engaging Tools, SELF5138{6800}
1990/12/10 Improved 9W1077 Start Switch Assembly And 7N4160 Heat Start Switch Group{1416}
1990/12/10 Correct Handling And Installation Of Temperature Switch Assemblies{1906}
1990/12/10 Correct Handling And Replacement of 3T6962 Pressure Switch Assembly{7332}
1990/12/10 New 7E5085 Bushing Replaces Former 2M4314 Bushing In Fuel Injection Pump Groups{1251}
1990/12/10 New Rear Power Takeoff Clutch Plates Do Not Contain Asbestos{3055,3404}
1990/12/10 Tools Available For Out-Of-Chassis Dynamometer Testing Of Electronic Engines{0781,1901,1913}
1990/12/10 New Engine Magnetic Speed Sensor Used{1907}