1990/10/22 Caterpillar

Front Trunnion Bolts May Come Loose {1153,1154}

Usage:

3306B ( 63Z, 76R ) Truck Engines

The front trunnion bolts may come loose and cause oil to leak on certain truck engines. The cause may be the misalignment of the front frame mounting holes. If the mounting holes are not aligned, the front engine support group can be pulled forward and put excessive stress on the trunnion bolts. If the trunnion bolts are found to be loose, use the following procedure and illustration to check the alignment of the bolt holes.

Procedure To Check Front Trunnion Bolts For Alignment

1. Position the truck on a level surface and secure the truck from any movement. Place suitable supports under the engine.

2. Remove the mounting bolts that hold the trunnion, the front engine support group, and the truck frame.

3. Position the front engine support group and tighten the mounting bolts in the sequence which follows. See the illustration.

a. Three 0L1329 Bolts (A) in the trunnion, and two 1B4367 Bolts (B) in the front engine support group.

b. Front engine support bolts (C).

4. Check the alignment of the truck frame bolt holes with cross member (D). If the holes are aligned, install and tighten the bolts. If the holes are not aligned, contact the truck manufacturer or truck dealer.

Location of bolts to check for alignment and tightness.

Caterpillar Information System:

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1990/10/22 Setscrew And Nut Available For Fuel Setting And Injector Synchronization {1257}

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1990/10/22 Engine Service Training Literature Uses New Form Number {0370,0374}

1990/10/22 New 4C5084 Oil Filter Cutter Replaces Former 6V7905 Filter Cutter {1318,1261,5068}

1990/10/22 4C6600 Battery Voltmeter For Determining Battery Percent Of Charge {7468,0785,1401}

1990/10/22 Improved 3T2357 Horn Switch, 3T3453 Starting Aid Switch, 3T3947 Start Switch, 3T8514 Test Switch Assemblies {1416,1456}

1990/10/15 New Temperature Regulators; Regulator Service Hours Changed{1330,0770,1355,7527,7543}

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1990/10/15 Be Sure To Use Only 5P3975 Rubber Lubricant On The Core Assembly End Seals In Folded Core Or Multiple Row Module Radiators{1353,1351}

1990/10/08 New Pump Group With Bolt Dampers Used In Oil Pump Group{1304}

1990/10/08 Price Adjustments On Service Program Modules{1902,0782}

1990/10/22 Increased Capacity Oil Sumps Require Additional Oil And Different Maintenance Interval {1302,1318,7524,7525}

1990/10/22 New "On Engine" Adjustment Procedure For 3161 Woodward Governor {1264,0782}

1990/10/29 New CE (Caterpillar Environmental) Family Of Metal-Shell Connectors Used{7553}

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

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

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

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

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

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

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

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