1994/04/22 Caterpillar

Identification Of Intake And Exhaust Valves That May Be Used In Remanufactured Direct Injected 3400 Cylinder Heads{1105}

Usage:

3406 And 3408 Truck Engines

The following chart identifies the part numbers of all acceptable intake and exhaust valves used in remanufactured direct injected 3400 cylinder heads.

History

1. In 1981 the 4N-5654 Intake Valve was canceled and replaced by (CRB) the 1W-3859 Intake Valve. At the same time the 7N-4580 Exhaust Valve was CRB the 1W-3860 Exhaust Valve.

2. A Truck Engine News article, dated September 1982, titled "Improved Inlet And Exhaust Valves" announced the above changes and said the former valves could be installed again if they were in usable condition.

3. In 1983, the 1W-3859 Intake Valve was CRB the 2W-2622 Intake Valve to provide a valve that did not use cobalt.

4. A Truck Engine News article, dated September 1984, titled "New Inlet Valve Used" announced the new 2W-2622 Intake Valve.

5. Currently, the remanufacturing facility conducts an "Eddy Current Test" on all 3400 intake valves before they are used again. Caterpillar engine engineering has approved the reuse of all intake valves from any former 3400 applications, as long as those valves pass all required inspections.

Caterpillar Information System:

1994/04/22 New Air Compressor Drive Gear Used In Accessory Drive Group{1207}

1994/04/22 New Power Steering Pump Drive Gear Used In Accessory Drive Group{1207}

1994/03/01 The Ninth Edition Of The Lubricating Oils Data Book Is Available From The Engine Manufactures Association (EMA) {1318}

1994/03/01 Electromagnetic Fan Clutch Available{1359}

1994/03/01 Improved Ceramic Turbocharger Group Used{1052}

1994/03/01 Improved 1R-0712 Fuel Filter Available{1261}

1994/03/01 New Seal Used In Air Lines Group{1058}

1994/02/01 New 7X-1715 Cable Assembly (Small, 40 Pin Breakout) Available{0779,1900}

1994/02/01 September 1993 Personality Module Release Improvements{1902}

1994/02/01 Remove Internal Components From 4P-8454 Cover Assembly{1309}

1994/02/01 New Turbocharger Models Have Left-Hand Threads On Compressor Nut And Turbine Shaft{1053,1052}

1994/01/01 List of Service Publications{0374}

1994/04/22 Fuel Injection Pump Improvements{1251}

1994/04/22 Final Control Group (Personality Module) Update{1902}

1994/04/22 Service Tools For Electronic Controls{0781,0782}

1994/05/31 Date Code On 7000 Series Fuel Injection Nozzles; New Seals Used In 7000 Series Fuel Injection Nozzles {1254}

1994/05/31 New Oil Cooler And Filter Base Assembly And New Oil Cooler And Filter Base Group Have Stronger Mounting Flanges {1378,1306}

1994/06/24 New Intake And Exhaust Valves Used{1105,1100}

1994/06/24 New Rocker Arm Adjustment Screw Used To Adjust Valve Clearance{1123,1100}

1994/06/24 New Valve Lifter Assembly Provide Improved Lubrication Of Lifter Roller And Camshaft Lobes{1209,1210}

1994/06/24 Procedure For Lapping Sealing Surfaces Of Fuel Injection Pump Barrels And Bonnets{1251}

1994/06/24 Installation Procedure For 1R-0716 Engine Oil Filter{1318}

1994/07/01 Be Sure To Use The Correct Reverse Flow Check Valve{1251}

1994/07/01 Fuel Injection Nozzle Spray Orifice Plugging{1254}