1983/03/14 Caterpillar

Fabricated Bracket Decreases Stress On Refrigerant Compressor Bracket{1405,1802}

Usage:

3406 Truck Engines Equipped With Refrigerant Compressors For Air Conditioners

There have been reports of failures of 9N3243 Brackets in the 9N5033 Refrigerant Compressor Mounting Groups on 3406 Truck Engines so equipped. Analysis has shown that vibration of the bracket during engine operation causes the failure. Also, vibration of the 9N3243 Bracket can cause failures of other parts such as the 4N4941 Alternator Adjustment Rod and the 9N409 Alternator Bracket.

A fabricated bracket can be installed to give added support for the refrigerant compressor. Use of this bracket will decrease possible vibration of the 9N3243 Bracket and give it extended service life.

Illustrations 1, 2 and 3 show the dimensions and specifications for the fabricated bracket. The bracket is fastened on the top two bolts of the fan drive bracket and to the refrigerant compressor as shown in Illustration 4.

Illustration 1.

Illustration 2.

Illustration 3.

Illustration 4.

Caterpillar Information System:

1983/03/14 New Manual BrakeSaver Control Group{1159}

1983/02/28 New Instruction Decal Used On 6V4060 Engine Set Point Indicator{0374}

1983/02/28 Use Vacuum Tester For Quality Control Check Of Water Pump Seal{0652,1361}

1983/02/28 New Rack Shutoff Solenoid Available{1257,1259}

1983/02/28 Engine Valve Stem "Use Again" Specifications{0653,1105}

1983/02/28 Use FT1783 Fixture To Drill Vent Holes In Impeller{0665,1361}

1983/02/28 New Specifications For Installation Of Crankshaft Counterweight Bolts{1202}

1983/02/28 Test Procedure For Hydramechanical Shutoff After Engine Storage{7418}

1983/02/14 New Water Pump Has Improved Seal{1361}

1983/02/14 Check Cylinder Bores For Chamfer During Reconditioning{1202,1222,1223}

1983/02/14 New Clutches For Rear Power Take-Off{3055,3054}

1983/01/31 Special Instruction Available For "Troubleshooting And Repair Of The 6V2100 Multitach"{0651}

1983/03/14 "Gas Engine Application And Installation Guide" Now Available{0374}

1983/03/14 Additions To Reference Chart For Major Production Changes{0374,0375,1000}

1983/03/14 Change Made To 6V3032 Deluxe Test Lead Kit{0651}

1983/03/21 New Bolt Used In Front Engine Support{1154}

1983/03/21 Application Of Labels To Plastic Tool Cases{0630}

1983/03/21 New Shutoff Solenoid Group Used{1259}

1983/03/21 FT1588 Cover Storage Rack{0634}

1983/03/21 New Turbocharger Inlet Tube Assembly And New Seal Available{1059,1061}

1983/03/21 8S1603 Socket Group For Use On Bolts With 12 Point Heads{0612}

1983/04/04 Improved Valve Springs Available{1108}

1983/04/04 Oil Passage Plugs Are No Longer Installed In Crankshafts For Parts Service{1202}

1983/04/04 New Gasket Prevents Leakage{1201,1362,1380}