Check For Correct Spring Retainer On Oil Pump Bypass Valve When Oil Pan Is Removed
Usage:
3406 And 3408 Truck Engines
A 1N3246 Retainer is used to hold the spring in the oil pump bypass valve for 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:
1980/11/24 Inspect All Engine Oil And Fuel Filter Elements Before Installation{1000,1261,1318}
1980/11/24 Modification Of Puller Bolt Prevents Thread Damage During Removal Of Sleeve From Sleeve Metering Fuel System{0621,1251,1253}
1980/11/24 Kysor Air-Operated Shutdown Actuators For 3406, 3408, 1693 Truck Engines
1980/11/24 Coolant Conditioner Elements Are Now Available For 3208 Truck Engines
1990/01/15 New Head Gasket Used On 3306B Truck Engines {1124,1100,1101}
1990/01/15 Unit Injector Tips Now Have An Improved Brazing Technique {1290}
1990/01/15 Service Element Available For Flexible Coupling Group {3252}
1990/01/15 Separate Service Manual Microfiche Library Available For Engines Only {1000,0374,0375}
1989/12/25 Improved Valve And Injector Jam Nut Used In Valve Rocker Arm Group{1123}
1989/12/25 Improved Gaskets And Covers Used In Cover Groups, Connection Group And Water Lines Groups; New Clips Used In Water Lines Groups{1350,1063}
1989/12/25 New Valve Assembly And Washer Used In Fuel Transfer Pump Group{1256}
1989/12/25 New Fuel Return Valve Prevents Siphoning{1253,1274}
1980/11/24 New Decals Permit Easier Identification Of Fuel System Settings On Most Truck Engines
1981/01/23 Improvements Made To 5P9718 And 6V186 Disc Pads Used During Gasket Removal
1981/01/23 Thicker Layer Of Chrome Now Used On Governor Spring Guide To Extend Its Service Life
1981/01/23 Two Replacement Lights Available For 5P7277 Voltage Tester
1981/01/23 Larger Plug Used In The Ends Of The Rocker Arm Shaft Assembly
1981/01/23 Wrong Turbocharger Group Shown In Parts Book
1981/01/23 Purchase 3208 And 3406 Truck Engine Operation Guides, Parts Books And Service Manuals Directly From Caterpillar
1981/01/23 List Of Service Publications
1981/02/04 6V3150 Engine Pressure Group And 6V3121 Multitach Group Are Available For Testing Engines
1981/02/04 New Front Housing Assembly And Gaskets Used
1981/02/04 Different O-ring Seal Now Used On The Oil Pump Suction Tube
1981/02/04 Inspection And Test Procedures To Follow When Fuel Ratio Control Does Not Operate Correctly