1980/03/24 Caterpillar

Inspect Regulator Cover Assembly When Overcooling Is A Problem{1350,1380}


3400 Series Engines

SUPPLEMENT: 04/28/80

SERVICE MAGAZINE, MARCH 24, 1980, PAGE 1. In the article "Inspect Regulator Cover Assembly When Overcooling Is A Problem," the 6N362 part number shown in the first paragraph and in the illustration title is wrong. Change the 6N362 part number to 4N362.

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

In the 3400 Series Engines, one of two designs of regulator cover assemblies is used, according to the type and serial number of the engine. Early 3406 (92U3134 and earlier) Truck Engines and all 3400 Marine, Industrial and Vehicular Engines use a N362 Regulator Cover Assembly. This regulator cover has a small hole near the opening for the water temperature regulator. A ferrule is installed in this hole. The ferrule has an orifice to vent (let out) air vapor from the engine. Loss of this ferrule will cause overcooling so inspect the cover to make sure the 2H1193 Ferrule is installed as shown.

The 3408 and later 3406 Truck Engines have a 9N947 Regulator Cover Assembly. This regulator cover does not have a vent hole, and a separate line is used to vent vapor from the engine. If a wrong cover (with a vent hole) has been installed, it will cause overcooling.

Location of 2H1193 Ferrule on the N362 Regulator Cover Assembly.

Caterpillar Information System:

1980/03/03 Fuel Heaters Are Now Available For Field Installation{1296}
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1980/02/25 Identification Of Fuel Injection Lines And Nozzle Bodies For Different Combustion Systems{1252,1254}
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1980/02/04 Real Value Available Through Caterpillar Remanufacturing Programs{0374}
1980/03/24 Crankshaft Rear Seal And Wear Sleeve Are Now Serviced As A Group Instead Of Separate Parts{1161}
1980/03/24 New Top Piston Ring Has Plasma-Coated Face{1215}
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1980/03/24 Different Water Temperature Regulators Now Used To Prevent Overheating{1355}
1980/03/24 Visual Inspection Of Main And Connecting Rod Bearings{1203,1219,1230}
1980/03/24 New Fuel Injection Lines And Clamps Prevent Stresses And Contact Which Can Cause Leakage{1252}
1980/03/24 An Increase In Engine RPM Will Extend Vanes In Hydraulic Oil Pump To Start Pump Output{5055,5068}
1980/03/24 New Plugs And Rubber Stoppers For Machines With Sealed And Lubricated Track{4169,4170,4175,0622}
1980/03/24 New Control Valve Body{1155,1159}
1980/03/24 Different Vibration Damper Now Used{1205}
1980/03/31 Use The 6V200 Hydraulic Wrench To Get Correct Torque Applications On Fasteners In Difficult Access Areas{0612,0623}
1980/03/31 6V2023 Flow Check Adapter Group Is Available{0651,0654}
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