1981/11/13 Caterpillar


Oil Pan Drain Plug Has More Threads

Usage:


3406, 3408 Truck Engines

Description of Change: A new drain plug with more threads is used in the oil pan group on 3406 and 3408 Truck Engines. With more threads engaged, this prevents thread stripping (damage) in the aluminum oil pans. Threads on the new plug are about 17.1 mm (0.67 ") long, and on the former plug the thread length is about 7.6 mm (0.30 ").

Adaptable As: The new 1W7573 Plug is a direct replacement for the former 8M3837 Plug.

Caterpillar Information System:

1981/11/13 New Clearance Specifications For Oil Pump Rotor Tip
1981/09/23 Lubricant Gives Protection To Camshaft And Roller During Initial Start-up
1981/09/23 Low Idle Instability: New Low Idle Setting
1981/09/23 New Exhaust Gas Recirculation Solenoid Used
1981/09/23 One-piece Panel Used For Oil Pan Sound Suppression
1981/09/23 Timing Pin Removed From Governor And Fuel Injection Pump Group; Change To Service Manuals
1981/09/23 Spring Pins No Longer Used In Water Pump Drive Gear
1981/09/23 Troubleshooting: Water Pump Failures
1981/09/23 FT1632 Bolt Used During Removal Of Sleeve From Sleeve Metering Fuel System
1981/09/23 Changes To Brakesaver Groups Give Longer Service Life
1981/09/23 Comparison And Applications Of Six And Eight Counterweight Crankshafts
1981/09/23 Higher Torque Used With Later Head Bolts
1981/11/13 Bolt Torque Specifications Changed For Crankshaft Pulley And Power Take-off Adapter
1981/11/13 Reference Chart For Major Production Changes On 3208 Truck Engines
1981/11/13 New Cylinder Block Permits Use Of A Small-frame Turbocharger
1981/11/13 Service Manual Information About Inside Diameters Of Valve Guides
1981/11/13 Part Number For Fuel Injection Pump Group In New Location
1982/01/13 New 6V4190 Auto Programmer Group And 6V4865 Auto Programmer Connector Used With 6V2100 Multitach
1982/01/13 New Springs For Timing Advance Used In Governor And Fuel Pump Drive Group
1982/01/13 "SIRS User Instructions" Available
1982/01/13 New Regulator Assemblies Used
1982/01/13 New Torque Specification For Bushing
1982/01/13 List Of Service Publications
1982/01/13 New Cylinder Liners And O-ring Seals Give Longer Seal Life
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