1978/03/27 Caterpillar

More Torque Now Used To Tighten The Retainer Nut For Turbocharger Compressor{1052,1053}

Usage:

3406 Marine and 3408 Truck Engines

Description of Change: More torque is now used to tighten the retainer nut for the turbocharger compressor on 3406 Marine and 3408 Truck Engines equipped with Schwitzer turbochargers. Formerly, it was possible for the nut to loosen.

Adaptable To: The new torque is used only on those Schwitzer turbochargers made after July 15, 1976. Before this date, a softer material was used to make the compressor shafts and less torque was needed on the retainer nut. After July 15, 1976, the compressor shafts were made of a harder material and more torque was needed.

To tell which turbocharger your 3406 Marine or 3408 Truck Engine is equipped with, look at the nameplate on the turbocharger housing. Any Schwitzer turbocharger with a date code of ^*G1576 or later must have the retainer nut for the compressor tightened to a torque of 44 ± 2 lb ft (60 ± 3 N·m). Turbochargers with an earlier date code must have the retainer nut tightened to 32 ± 2 lb ft (43 ± 3 N·m)

- Letters A-L are the months January through December, respectively.

- The second and third numbers are the day of the month.

- The fourth and fifth numbers are the year.

EXAMPLE: G1576 = July 15, 1976.

^*Explanation of Date Code

Caterpillar Information System:

1978/03/27 5P4149 Conversion Group To Become A Discontinued Item On October 1, 1978{0650,1254}

1978/03/27 How To Find Correct Oil Change Intervals For Truck Engines Operated In Short Distance Applications (Pick Up And Delivery Service){1318,7500,0374}

1978/03/27 9N3700 Or 9N3299 Nozzle Assemblies Must Be Used On 3208 Engines That Are Equipped With Exhaust Gas Recirculation (EGR){1254}

1978/03/27 Improved Thrust Washers Now Used With Planet Gears{3000,3072,3106,3110,3003,3001,3100,3116,3159,3176,3107,5150,5165}

1978/03/27 5P8675 Extension Handle Available For General Uses{0614}

1978/03/27 Use 5P8706 Die Repair Kit For The Repair Of 9S6331 Die Assembly{0623}

1978/03/20 "Danger Do Not Operate" Tags Now Available{0374}

1978/03/13 The Causes And Reduction Of White Exhaust Smoke During Cold Engine Starts; Maintenance Aids Available To Decrease This Problem{1250,1383,1050}

1978/03/13 Soft Washers And Lockwashers Are Now Used With The Mounting Bolts For Air-Fuel Ratio Control{1278,1264}

1978/03/13 When A 6N5906 Hour Meter Will Not Operate Correctly, Check The Electrical Supply Before A Replacement Hour Meter Is Installed{7480,1400}

1978/03/13 5P8687 Tee Test Tooling Group{0651,5050}

1978/03/06 New Starter Motors Have Solenoid On Top Of Starter{1407,1453}

1978/03/27 Correct Adjustment Of The Governor Control Linkage In Truck Engines Is Necessary To Prevent Low Power{1265,1269}

1978/04/03 Procedure For Alignment Of Transmission Mounting Parts On 1100 Series And 3208 Truck Engines With Allison MT640, MT650, And AT540 Series Transmissions{3000,1156,1157}

1978/04/03 A Gasket Group Is Available To Give Improved Sealing For The Oil Supply To The Rocker Arms On Early Engines{1101,1102,1221}

1978/04/10 New Piston Group With Better Service And Operation Characteristics Now Available{1214}

1978/04/10 New 5P9693 Reusable Cable Tie For Storage Of Wires, Cables And Tubing{0630}

1978/04/10 New Lifting Eye Group Used On 3412 Industrial Engines Equipped With Turbochargers{1101,1000}

1978/04/17 Improved Yokes, Hardened Washers And More Torque Keep Valve Lifter Guides Tight {1209}

1978/04/17 Locating Bushings For The 5P3550 Rod Boring Machine Will Now Hold Tapered Piston Pin Bushings {0626}

1978/04/17 Improved Oil Suction Tube Assembly {3300,3302}

1978/04/24 Use 6V100 Tool Arrangement To Remove And Install Piston Pin Bearings For Both Tapered And Standard Connecting Rods{0620,1218}

1978/04/24 Do Not Use The 5B1401 Cleaning Tool Group To Clean The Orifice In Capsule-Type Fuel Injection Nozzles{0650,1254}

1978/04/24 Oil Grooves And Harder Gears Are Now Used In The Oil Pumps On 6.25" Bore Vee Engines{1304}