1981/04/09 Caterpillar

Clean Electrical Contacts In Exhaust Gas Recirculation (e.g.r.) Switch Group And Cover Assembly Before Installation


3208 Truck Engines Equipped With Exhaust Gas Recirculation (E.G.R.) Systems

SUPPLEMENT: 05/12/81

TRUCK ENGINE NEWS, APRIL 9, 1981, PAGE 5. In the article, "Clean Electrical Contacts In Exhaust Gas Recirculation (E.G.R.) Switch Group And Cover Assembly Before Installation, " there are two other contacts that also are to be cleaned. The illustration in this Supplement shows two contacts that were not shown originally. They are the two contacts nearest the bottom of the illustration.

Make a reference to this Supplement in the April 9, 1981 Truck Engine News article.

--------------- END SUPPLEMENT ---------------

Low emission 3208 Truck Engines use an exhaust gas recirculation (E.G.R.) system. The E.G.R. system uses a 9N5252 Switch Group and a 1W559 Cover Assembly on the fuel injection pump.

It is important that the electrical contacts in the switch group and the cover assembly be clean and dry before installation. See the Illustration. This is necessary for a good electrical connection.

It is Caterpillar's recommendation that the contacts be thoroughly cleaned with Heavy Duty Solvent Flux Remover, MS 190 HD. This will remove any foreign material from the contacts. The solvent flux remover is available from:

Miller-Stephenson Chemical Co., Inc.
6348 Oakton Street
Morton Grove, Illinois 60053


Miller-Stephenson Chemical Co., Inc.
1001 East First Street
Los Angeles, California 90033

Before installation of the 1W559 Cover Assembly, check its operation with the 6V3060 E.G.R. Tester Group. Then, install the cover assembly and use the test group to check the operations of the switch group and the cover assembly.

The arrows (marks) show the locations of contacts in the 9N5252 Switch Group and the 1W559 Cover Assembly.

If 6V3060 E.G.R. Tester Group is not available, install the switch group and the cover assembly as per the Service Manual instructions. Then, use a direct current voltmeter to check the voltage output from the cover assembly, as per the procedure given in the Service Manual.

Caterpillar Information System:

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1981/04/09 Special Studs And Nuts Available For Exhaust Manifolds On Engines Used In Heavy Load Conditions
1981/04/09 Correction To Torque Specification For Locknuts On Valve Clearance Adjustment Screws Of Engines Equipped With Jacobs Engine Brakes
1981/04/09 6V4163 Bit And 6V4164 Driver Now Available For Removal Of Bolts For Flyweight Carrier
1981/04/09 Low Engine Temperatures: Install Check Valve
1981/03/06 New Governor Spring Available For Specific Engine Applications
1981/03/06 New O-ring Seal Used In Egr (exhaust Gas Recirculation) Control Has Better Resistance To Heat Damage
1981/03/06 Check Oil Level Carefully To Prevent Operation With Too Much Oil In Engine Crankcase
1981/03/06 Two New Exhaust Manifolds Available For Replacement Of Single Rear Manifold To Prevent Broken Studs
1981/04/09 Electrical Information For Egr (exhaust Gas Recirculation) Systems On 3208 Truck Engines So Equipped
1981/04/09 Improve Use Of Engine Service Manual Microfiche
1981/04/09 List Of Service Publications
1981/04/09 Check All Settings When Fuel Injection Pump Group Is Installed
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1981/04/09 Fuel Pressure Relief Valve Is Shown Inverted (wrong End Up) In Parts Book Illustrations
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1981/05/12 Larger Valve Springs
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