New Crankshaft Main Bearings Used
Usage:
All 3408 And 3412 Industrial, Marine And Generator Set Engines
Description of Change: New crankshaft main bearings are now used on all 3408 and 3412 Engines. The new bearing has a different aluminum alloy layer under the lead tin overlay. This new aluminum layer permits a longer service life after the overlay has been worn away.
Adaptable As: The new 1W6589 Main Bearing is a direct replacement for the 8N5421 Main Bearing on these engines.
The new bearing is in effect with the serial numbers shown in the chart.
Caterpillar Information System:
1982/05/12 New Broken Link Spring Used In Governor
1982/05/12 Warranty Period Extended
1982/05/12 Use Correct Part Numbers For Main And Connecting Rod Bearings
1982/05/12 5P4812 Gauge Group Components Available Separately
1982/05/12 List Of Service Publications
1982/05/12 Fuel Rack Slots Have Improved Wear Resistance
1982/04/07 Carbon Build-Up In Combustion And Inlet Areas
1982/04/07 Improved Valve Cover Seal Used
1982/04/07 New Oil Pump Outlet Elbow Is Stronger
1982/04/07 Correct Use Of 6V2023 Flow Check Adapter Group Is Important To Prevent Damage To An Engine
1982/04/07 New Marine Gear Groups Have New Clutch Plates
1982/04/07 Use 5P5195 Fuel Line Wrench Correctly
1982/05/12 Use New 6V4910 Clamp-On Ammeter For Easier Electrical Current Measurement
1982/05/12 Lubricant Recommendations Changed For All Caterpillar Engines To Combat Effects Of Fuel Sulfur
1982/05/12 Improved Relief Valve Guide Decreases Maximum Oil Pressure During Cold Weather Starts
1982/05/12 5P3519 Gauge Group Components Available Separately
1982/05/12 New 6V4950 Injection Line Speed Pickup Group Used With 6V2100 Multitach
1982/05/12 6V4960 AC Current Probe Will Measure Current Easier
1982/05/12 Improved Plunger And New Spring Used In Mechanical Shutoff Group
1982/05/12 Expansion Tank Changed To Permit Installation Of Water Level Gauge
1982/05/12 New Mounting Bracket For Mechanical Shut-Off Cable
1982/05/12 Inspection Marks On Bearings
1982/05/12 Bolts Now Used Instead Of Studs To Hold Cylinder Heads
1982/05/12 Be Sure To Use Correct Water Temperature Regulator