1994/04/04 Caterpillar

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

Usage:

Caterpillar Machines Powered By 3406, 3408, Or 3412 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 Service Magazine article, dated September 6, 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 Service Magazine article, dated September 3, 1984, titled "New Inlet Valve Used" announced the new 2W-2622 Intake Valve.

5. A Special Edition of Service Magazine, dated September 9, 1985, titled "New Inlet Valve And Exhaust Valve" announced the new 2W2622 Intake Valve and new 1W3860 Exhaust Valve. This article recommended that the former valves not be reused if they had previously been used in 3408 or 3412 vehicular engines. The former valve could be reused if they were from other 3400 engine applications.

6. 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:

1994/03/28 Improved 1R-0712 Fuel Filter Provides Improved Sealing{1261}

1994/03/21 The Ninth Edition Of The Lubricating Oils Data Book Is Available From The Engine Manufactures Association (EMA) {1318}

1994/03/21 New Seal Used In Air Lines Group {1058}

1994/03/14 Articles Pertaining To Commercial Engines Or Truck Engines {0374}

1994/02/28 New Turbocharger Models Have Left-Hand Threads On Compressor Nut And Turbine Shaft {1053,1052}

1994/02/28 New Retaining Compound Is Available {0649}

1994/02/28 Soldering Iron Available For Field Use {0709,1400}

1994/02/21 Servicing Lighted Rocker Switches {1435}

1994/02/07 Fuel Injection Pump Improvements{1251}

1994/02/07 Cylinder Head Gaskets Improved To Provide Better Fire Ring Retention{1124}

1994/02/07 New Turbocharger Groups And New Turbocharger Cartridge Groups Have Improved Thrust Bearing And Turbine Ring Seal{1052,1053}

1994/02/07 12 And 24 Volt DC Work Lights Are Available{0600}

1994/04/11 Speed Sensor Available With Improved Reliability{1907}

1994/04/25 Lubricant Will Ease Installation Of Secondary Radial Seal Air Filter Element {1054}

1994/04/25 Service Tools For Electronic Controls {0781,0782}

1994/05/16 Fuel Dilution In The Engine Oil{1290,1318}

1994/05/23 Date Code On 7000 Series Fuel Injection Nozzles; New Seals Used In 7000 Series Fuel Injection Nozzles{1254}

1994/05/30 Three And Five Piece Wheel Rims Reduce The Possibility Of The Tire Bead Not Seating Correctly{4209,4202}

1994/06/20 Installation Procedure For 1R-0716 Engine Oil Filter{1318}

1994/06/27 New Assembly Procedure For Hydraulic Pump Groups With Double Shaft Seals And A Weep Hole Between The Seals Helps Prevent Contamination Through The Weep Hole{5073}

1994/07/04 New Cylinder Head Gasket, Spacer Plate And Head Bolts Used; New Cylinder Liner Projection Measurement Method; New Cylinder Head Torque Sequence; Improved Coolant Flow (Cylinder Heads) {1124,1221,1216,1101}

1994/07/11 Different Fuel Filter Available To Prevent Premature Wear On Fuel Injection Pump Plungers And Barrels{1261,1251}

1994/08/08 SOS Allowable Soot Level Changed{1318}

1994/08/15 Switches With Screw Terminal And Sure Seal® Connector Replaced By Switches With A DT Connector{1400,7400}