1980/11/17 Caterpillar

Check For Correct Spring Retainer On Oil Pump Bypass Valve When Oil Pan Is Removed{1315,1302}

Usage:

3406, 3408 And 3412 Industrial And Marine Engines;
3406 And 3408 Truck Engines

SUPPLEMENT: 03/01/82

SERVICE MAGAZINE, NOVEMBER 17, 1980, PAGE 2. In the article "Check For Correct Spring Retainer On Oil Pump Bypass Valve When Oil Pan Is Removed," change the subtitle to "All 3406, 3408 and 3412 Engines."

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

A 1N3246 Retainer is used to hold the spring in the oil pump bypass valve for 3406, 3408 and 3412 Industrial and Marine Engines, and 3406 and 3408 Truck Engines.

Any time an oil pan is removed from one of these engines, check to make sure a 1N3246 Retainer is used to hold the spring. The part number is on the retainer.

Formerly, a 4N522 Retainer, which is now canceled, was used. It was possible for the 4N522 Retainer to break. A broken retainer will cause the oil pump bypass valve to open and it will not close. With the bypass valve open, not enough oil will flow through the engine to give good lubrication.

Caterpillar Information System:

1980/11/10 Wrong Installation Of Washers Between Bearing Cone And Bearing Retainer Nut Can Cause Directional Clutch Damage{3155,3159,3176}

1980/11/10 Different Caps And Adapters For Ball Studs On Circle Drawbars Can Be Used Without Plastic Inserts{6170,6171}

1980/11/10 6V3147 Main Bearing Wrench Now Available{1203,0612}

1980/11/10 Valve Assembly And Nipple Moved From Centershift Lock Control Group To Brake Control Group To Prevent Unauthorized Operation{4282,4267,5220,5221,5223,6151}

1980/11/10 Double-Check Those Dimensions{0374}

1980/11/03 Recommendations For Replacement Of Tandem Drive Chains{4063}

1980/11/03 Spider And Bearing Assembly Must Be Correctly Installed In Drive Shaft-To-Power Control Box Universal Joint{5234,5204,5201}

1980/11/03 FT1523 Fuel Oil System With External Filter Is Available{0652}

1980/11/03 Two Replacement Lights Available For 5P7277 Voltage Tester{0651}

1980/11/03 Adjustable Sequence Valve Permits Better Winch Operation According To The Job{5166,5168,5173,5163}

1980/11/03 FT1514 Lubrication Manifold Permits Lubricant To Be Added To The Output Shaft Bearings Without Removal Of Rear Cover From Fuel Injection Test Bench{0652}

1980/11/03 Pulley With Keyway Can Be Used When Replacement Alternator Is Installed{1405}

1980/11/17 Coolant Conditioner Elements Are Now Available For 3208 Engines{1350}

1980/11/17 Two Thinner Spacers Available For Use During Adjustment Of Off-Engine Timing Dimension{1251,0653}

1980/11/17 6V4021 Piston Ring Compressor Group Available{1215,1214,0622}

1980/11/17 New Exhaust Manifold Group And Air Lines Group Used To Prevent Exhaust Leakage{1059,1061}

1980/11/17 Use Dust Cap To Prevent Freon Leakage From Air Conditioner; Cap Is Available As Replacement Part{7320}

1980/11/17 Some Remanufactured 3406 Engines Have The Wrong Reference Serial Number On The Identification Plate{7557,1000}

1980/11/24 New Aftercooler Core Has Copper-Nickel Tubes For Increased Strength{1063,1064}

1980/11/24 Replacement Wheel Available For Service Of 6V97 Engine Stand Group{0626}

1980/12/01 Direct Inquiry Service Information Retrieval System (SIRS) Available To U.S. And Canadian Dealers{0374}

1980/12/01 Exhaust Manifold And Air Lines Groups Changed To Prevent Exhaust Leakage And Damage To Manifold Gaskets And Mounting Studs{1059,1061}

1980/12/01 Larger Plug Used In The Ends Of The Rocker Arm Shaft Assembly{1102}

1980/12/01 New Service Handle Kit Permits Cab Door To Be Opened From Inside While Locked (Fastened With Lock){7308,7301}