1990/11/05 Caterpillar

New Crankshaft Seal Groups Used{1160,1161,1202}

Usage:

D346, D348, D349 Engines;
D10, 776 Tractors;
777 Trucks

Reference: Service Magazine; June 3, 1985; Page 10; "New Crankshaft Seals Used."

Reference: Special Instruction, SMHS8508, "Special Handling Information And Installation Instructions For Crankshaft Seal Groups That Have Hydrodynamic Grooves In The Sealing Lip."

Description of Change: The new crankshaft seal groups give improved sealing and longer life than the former lip-type seals. The new seal groups have grooves machined into the seal face that move oil back into the crankcase as the crankshaft turns. Therefore, crankshaft rotation is very important to seal function.

NOTE: These seal groups are to be used on STANDARD ROTATION engines only.

Adaptable To: The front 7C7473 Seal Group is a direct replacement for 2P3846 Seal and 2P3847 Sleeve. The rear 7C7474 Seal Group is a direct replacement for 8S5138 Sleeve and 8S5141 Seal.

New seal groups.

Caterpillar Information System:

1990/11/05 Service Manual SENR3479-04 Available For Troubleshooting Engine Test Procedures{1901,1900}

1990/11/05 Some Components Of The 7E3580 Engine Adapter Group For Allison AT545, MT543D, And MT653DRD Transmissions Are Not Serviced By Caterpillar{3279,1013,3009}

1990/11/05 New Stronger Exhaust Valve Push Rod Used In Valve Mechanism Groups{1208}

1990/11/05 New Exhaust Manifold Gasket And Locks Used In Exhaust Manifold Groups{1059}

1990/11/05 Obsolete Capacitor In VR1 Voltage Regulators{4467}

1990/11/05 New Composite Halogen Headlights And Floodlights Available{1429,1434}

1990/10/29 Improved 7W7730 Cylinder Head Gasket Provides Better Sealing Capability{1124}

1990/10/29 New Cylinder Head Gasket And Higher Cylinder Head Bolt Torque{1124,1101}

1990/10/29 Modification Of 1U7791 Valve Seat Driver{0782,1103}

1990/10/29 New Bearing Kits Used In Turbocharger Cartridge Groups{1052,7551}

1990/10/29 Governor Control Motor Polarity May Require A Change{1265,1408,7556}

1990/10/29 New Temperature Regulators Prevent Engine Overheating{1355}

1990/11/12 New 7X1400 Digital Diagnostic Tool (DDT) Group Available {0782,0785,1900}

1990/11/12 Adjustable Exhaust Bypass Group Used; Provides More Precise Ability To Set Exhaust Pressure {1057}

1990/11/12 New Alternator Drive Pulley Seal Used With New Drive Pulley; Poly-Vee Belt Can Be Installed {1425,1357}

1990/11/19 Diagnostic Connector Used To Determine Starter Problems; Starter Monitor Unit Can Be Fabricated{0710,1408,1416,1426,1467,1553}

1990/11/19 New Caterpillar Battery Warranty Statement, SELF5124{1401,7780}

1990/11/19 Correct Procedures For Starting, Stopping And Transporting A Product With A Turbocharged Engine{1052}

1990/11/19 Check Engine Speed Sensor And/Or Crank Angle Sensor (Magnetic Pickups) For Fouling{1912,1900,1907,7529}

1990/11/19 Use Only Stainless Steel Cylinder Liner Shims To Salvage Damaged 4.75" Bore Cylinder Blocks{1201,1216,1217}

1990/11/19 New Roller Camshaft Used{1209,1210}

1990/11/19 New Camshaft Has Improved Wear Resistance{1210,1209}

1990/11/19 Field Replacement Of Spacer To Correct Possible Sticking In Woodward 3161 Governor Electric Shutoff Group{1264}

1990/11/19 New 4C6715 Silicone Compound Available For Components Where Centrifugal Force Is Present{4465,4466,4472,4473}