Oil Holes In Crankshaft Main And Rod Journals
Usage:
3400 Truck Engines
Formerly, a large chamfer was machined on the oil holes in the crankshaft main and rod journals. See the illustration. A new smaller chamfer has been used for several years. To make the new small chamfer, a hand tool is used to break (remove) the sharp edge of the oil hole. Then the oil hole is hand blended smooth. The result may be a non-uniform small chamfer (when compared to the former chamfer) around the oil hole.
NOTE: NO crankshafts should be reworked to provide the larger chamfer.
Comparison of chamfer on the current oil hole (A) and the former oil hole (B) in the crankshaft main and rod journals.
Caterpillar Information System:
1992/09/01 Thicker Head Gaskets Available For Use With Resurfaced Cylinder Blocks
1992/09/01 Governor Specifications Are Available Through The Technical Information System
1992/09/01 New Fuel Injection Pump Groups Have Larger Diameter Camshaft Bores, New Lifter Assembly, And Shorter Plunger And Barrel Assembly.
1992/09/01 New Plug And O-Ring Can Help Prevent Oil Leakage At The Flywheel Housing Gasket
1992/08/01 Reusability Of Exhaust Valves In All Caterpillar Engines
1992/08/01 Supplemental Coolant Additive Requirements
1992/08/01 New "3406B Engine Instructor Manual " Available
1992/08/01 Be Sure The Fuel Injection Pump Housing Is Compatible With 0R0715 And 0R2545 Remanufactured Short Blocks
1992/08/01 Application Changes For Electronic Unit Injector (EUI) Part Numbers
1992/08/01 New Electronic Unit Injector (EUI) With New Style Solenoid Used; New Unit Injector Wiring Group Used
1992/06/01 List of Service Publications
1992/06/01 Boxes/Cartons Containing Used Cores Should Be Immediately And Clearly Identified
1992/10/01 3406 Truck Engine Component Update
1992/11/01 New Liner Seat Inserts Available
1992/11/01 New Cylinder Head Gasket, Spacer Plate And Head Bolts Used and New Cylinder Liner Projection Measurement Method
1992/11/01 Improved Fuel Injection Line Assemblies And Clamps Used
1992/11/01 Replacement Governors For Early Engines
1992/11/01 Supplemental Coolant Additive Requirements
1992/11/01 List Of Service Publications
1992/12/01 New Gasket And Plate Used In Front Housing Group To Help Prevent Oil Leaks
1992/12/01 New Unit Injector Sleeve Used In Cylinder Head Groups
1992/12/01 New Cylinder Head Gasket Used
1992/12/01 Cylinder Pack Puller Groups Improved
1992/12/01 Left Handed Threads In Compressor Nut On Some Caterpillar Turbochargers