Main Bearings Now Have Larger Diameter Oil Hole For Better Lubrication Of Main And Rod Bearings{1203,1219,1300}
Usage:
3208 Engines
Description of Change: The upper halves of the main bearings have been changed on 3208 Engines starting with Serial Numbers 40S74512 and 90N33517. The new upper main bearings, numbers 2, 3, 4 and 5, have a larger oil supply hole than the former main bearings. The diameter of the oil supply hole has been increased from .22" (5.6 mm) to .31" (7.9 mm). This larger hole increases the oil pressure at the rod bearings from 7 psi (50 kPa) to 33 psi (230 kPa) at rated rpm. The increased oil pressure gives better lubrication to the bearings.
Adaptable As: The new main bearings are a direct replacement for the former main bearings used in 3208 Engines (40S1-Up and 90N1-Up).
Caterpillar Information System:
1979/02/19 Engine Valve Springs Are Now Made Of Carbon Steel Alloy{1101,1108}
1979/02/19 New Exhaust Pipe Connector Makes A Tighter Seal Between Pipe And Manifold{1061,1059}
1979/02/19 New Exhaust Valve And Valve Guide{1104,1105}
1979/02/19 Modification Of 5P9726 Plug Gauge That Is Used To Check Brake Wear{0653}
1979/02/19 Use Correct Procedure To Clean The Engine Lubrication System If Permanent Type Antifreeze (Ethylene Glycol) Is In The Engine{1318,1350}
1979/02/19 Use SIRS To Keep Service Literature Current{0374}
1979/02/05 High Sulfur Fuel Can Cause Severe Engine Wear And Internal Damage{1280}
1979/02/05 Stronger Suction Bell Assembly Now Used In Engine Oil Lines Group{1318,1307}
1979/02/05 Federal Law Prohibits Tampering With Noise Control Systems{0116}
1979/01/29 Fuse And Wire Assembly Is Available For Protection Of Earlier 6N5906 Service Meters{7480}
1979/01/22 Ether Starting Aid Groups Are Now Available{1456}
1979/01/22 New Tachometer Drive Adapter Has Increased Service Life{7462,1288}
1979/03/05 New Engine Cylinder Block Used{1201}
1979/03/05 New Piston And Connecting Rod Are Tapered In Area Of Piston Pin{1213,1214,1218,1219}
1979/03/05 New Fuel Injection Nozzles Are Used In 3208 Engines{1254}
1979/03/05 Improvements Made To Fuel Injection Pump And Governor Group{1253,1281,1286}
1979/03/05 New Oil Pan Assembly Uses An O-Ring And Plug For A Better Seal{1302}
1979/03/05 Engine Mounted Exhaust Brake Systems Can Be Used To Extend Service Brake Life{1050}
1979/03/12 New Larger Capacity Water Separator Is Available{1250}
1979/03/12 Retroreflective Tape Makes Phototach Kit Easier To Read{0651,0653}
1979/03/12 New Manifold Assembly Gives More Room For The Lifting Eye{1059}
1979/03/12 SAE 15W/40 Multiviscosity Oil Can Be Used In Engines, Transmissions And Final Drives{1318,3067,3179,4070}
1979/03/12 New Design Fuel Injection Valve Body Used In Fuel Injection Lines Group{1252,1254}
1979/03/12 Check Valve Must Be Adjusted Correctly To Let Fuel Flow Through The Return Line And Back To The Tank{1275,1253,1274}