Check For Correct Spring Retainer On Oil Pump Bypass Valve When Oil Pan Is Removed
Usage:
3406, 3408 And 3412 Industrial And Marine Engines;
3406 And 3408 Truck Engines
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:
1980/11/12 Inspect All Engine Oil And Fuel Filter Elements Before Installation
1980/11/12 Check Valve Added To Hydramechanical Shut-Off
1980/11/12 Take A Little Time: Check The "Supplements" Section Regularly For Important Information About Existing Publications
1980/11/12 Double-Check Those Dimensions
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1980/11/12 Special Tools Available To Tighten Retainer Nuts For Clutch Drive Hubs Of 7211 And 7221 Marine Transmissions
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1980/10/22 Pressure Relief Fitting Added To Fan Drive Hub For More Positive Lubrication Of Front Bearing
1980/10/22 Crankshaft Now Has A Fillet Radius At Front Main Bearing Journal
1980/10/22 6V3184 Brush Group Available To Clean Crankshaft Oil Passages
1980/10/22 New Tools Available For Installation Of Crankshaft Seals And Wear Sleeves
1980/10/22 New Basic Oil Pump Groups Use Hardened Gears For Longer Service Life
1980/11/12 Coolant Conditioner Elements Are Now Available For 3208 Engines
1980/11/12 Improved Cable Assembly For Mechanical Shut-Off Group
1980/11/12 Modification Of Puller Bolt Prevents Thread Damage During Removal Of Sleeve From Sleeve Metering Fuel System
1980/11/12 List Of Service Publications
1980/11/12 6V3147 Main Bearing Wrench Now Available
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1980/11/12 Two Replacement Lights Available For 5P7277 Voltage Tester
1980/11/12 Rack Shut-Off Solenoid Can Be Removed And Engine Started When There Is An Emergency
1980/12/10 6V4008 Valve Seat Extractor Now Available
1980/12/10 Some Remanufactured 3406 Engines Have The Wrong Reference Serial Number On The Identification Plate
1980/12/10 New Front Housing Assembly And Gaskets Used
1980/12/10 6V4021 Piston Ring Compressor Group Available