1988/12/19 Caterpillar

New Piston Body Assemblies Used {1214}

Usage:

3500 Family Of Engines;
D11N And 776B Tractors;
777B, 785, and 789 Trucks

Description of Change: New piston body assemblies are used in the above engines and machines. The shape of the skirt on the new piston body assemblies is slightly different than on the former piston body assemblies. The different shape will help make the new piston body assemblies more resistant to skirt scuffing when exposed to adverse conditions.

Adaptable As: The new 9Y2100 Piston Body Assembly is a direct replacement for the former 7W5466 Piston Body Assembly in engines in D11N and 776B Tractors; 777B, 785, and 789 Trucks. The former 7W5466 Piston Body is canceled. The new 9Y4124 Piston Body Assembly is a direct replacement for the former 7W552 Piston Body Assembly in the 3500 Family of Engines. The former 7W552 Piston Body Assembly is canceled.

Caterpillar Information System:

1988/12/19 Correct Timing Specification {0374}

1988/12/19 Larger Valve Springs Must Be Used With Williams Blue Ox® 485 kPa (70 psi) Exhaust Brake; New Spring Compressor Group Available {1108,1109,1119,0702,0703}

1988/12/19 Check Assembled Dimension For Rack Lever Travel If Governor Housing Assembly Is Replaced {1264}

1988/12/19 New Camshafts Used; Camshaft Installation Kits Available {1209,1210}

1988/12/19 New Material Used For Rotating Seal Rings In Some Power Shift Transmissions, Steering Clutches And Torque Converters {3101,3150,4100}

1988/12/12 Valve Kit Available For Explosion Relief Valve{1201,1233}

1988/12/12 Oil Cooler Bypass Elbow Changed To Prevent Bypass Valve Seizure{1314,1318}

1988/12/12 New Alternator Drive Pulley Has Hardened Wear Sleeve; New Seal Used On Pulley{1425,1357}

1988/12/12 Maintenance Procedure Extends Service Life Of Exhaust Manifold Studs{1050}

1988/12/12 New Mounting Bolts Used In Aftercooler Housings{1063,1058}

1988/12/12 Revised Instructions For Installation of New Maintenance Free Batteries{1401,1400}

1988/12/05 Improved Air Conditioner Thermostat Switches Have Tin-Plated Internal Parts{7320}

1988/12/19 Do Not Use Heli-Coils® To Repair Rocker Arm Assemblies On 5.4" Bore Engines {1123}

1988/12/26 Check Load Height Before Transporting Machines {7500}

1988/12/26 New Screw Used In BrakeSaver Water Lines Group {1155}

1988/12/26 Remove Fuel From Electronic Control Module (ECM) Before Shipping {1705}

1979/01/08 Prevention Of Fires On Hydraulic Excavators{7000,5057}

1979/01/08 Check The Adjustment Of The Original Tachometer Before A New Tachometer Is Installed{7462}

1979/01/08 A New 6V29 Sleeve Metering Fuel System Pump Roll Pin Tool Is Used To Adjust And Make A Replacement Of Roll Pins In The Fuel Injection Pump Housing{0626}

1979/01/08 New 6V87 Gauge Measures Valve Stem Wear{0653,1105}

1979/01/08 Improved Woodward Governor Groups{1264,1289}

1979/01/15 5P9705 Tapered Rod Tool Group Used For Removal And Installation Of Piston Pin Bearings In Tapered Connecting Rods{0622,1214,1218}

1979/01/15 Removal And Installation Of Taper Type Bearings{0622,1214,1219}

1979/01/15 6V83 Emery Polishing Paper{0675}