1988/12/19 Caterpillar

New Camshafts Used; Camshaft Installation Kits Available {1209,1210}

Usage:

3300 Family Of Engines

Description of Change: New camshafts with harder cam lobes, improved heat treat processing, and a larger diameter between No. 1 and No. 2 bearing journals are used in the 3300 Family Of Engines. The new camshafts have more resistance to lobe pitting and torsional vibration.

Adaptable To: The new camshafts with all three improvements are effective as follows:

3306B Vehicular Engine-8Z32529, 13Z11760

3306B Industrial Engine-64Z4626, 7JB1847

3306B Marine Engine-84Z893

3306B Generator Set Engine-85Z2637, 5JC645

3306B Truck Engine-63Z3300, 5KD398

3304B Vehicular Engine-7Z16281, 12Z15683

3304B Industrial Engine-10E1710, 4XB362

3304B Marine Engine-13E742

3304B Generator Set Engine 83Z3131, 3TC884

The improved camshafts can be installed in all earlier engines in the 3300 Family. If the new camshafts are installed, use a complete set of new lifters and coat the shaft lobes with the special cam lubricant. Used lifters probably will not have the same service life as the new camshaft, resulting in additional repairs and downtime. For this reason, the applicable camshaft kit listed in the chart should be used when a new shaft is installed.

Caterpillar Information System:

1988/12/19 New Detent Group Available For Hoist Control Valve {5051}

1988/12/19 New Axle Differential Group Used {3258}

1988/12/19 New Latch Used For Engine Side Doors {7263}

1988/12/19 Stronger Spacers Can Be Used On Stabilizer Street Pads {6505}

1988/12/19 New Brake Disc Assemblies, Axle Lubricant Reduce Brake Chatter {3278,4255}

1988/12/19 New Circle Drive Gerotor Motor Groups Provide Higher Torque To Circle Drive {5082}

1988/12/19 Cold Weather Readiness Checks {1456,1250}

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 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}

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

1988/12/19 New Piston Body Assemblies Used {1214}

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

1988/12/19 Operation Of Differential Lock {3264}

1988/12/19 Twelve Bolts Used In Drum Support Bearing Retainer {8227}

1988/12/26 New Muffler And Pipe Used; Low Idle Increased {1061,1062,1264}

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

1988/12/26 Enlarge Lower Hook Openings On Three-Point Hitch Quick Coupler Group {7120}

1988/12/26 Check Bore Length Of Gear And Sleeve Before Assembling In Transmission {3061}

1988/12/26 New Gas Cylinder Used In Operator's Console {7451}

1988/12/26 Improved Boom Cylinder Lines {5057,5456}

1988/12/26 Shorter Bolts Used For Bolt-On Cutting Edges {6801}