1979/03/05 Caterpillar

New Engine Cylinder Block Used{1201}

Usage:

3208 Industrial (90N37285-Up),
Marine (75V4002-Up),
Vehicular (79V5380-Up),
and Truck (32Y1-Up) Engines

Description of Change: A new cylinder block is used on the above engines starting with the serial numbers shown. The main bearing cap joint (junction) angle has been changed from 150° to 160°. This change makes the main bearing joint more rigid and puts less side stress on the block than before.

Adaptable To: A new 9N3763 Cylinder Block-Service Group is available and is a direct replacement for the former 9N1255 Cylinder Block-Service Group which has been canceled. In addition, a new 9N5190 Cylinder Block-Short is available and is a direct replacement for the former 9N2139 Cylinder Block-Short which has been canceled. Also, a new 9N3759 Service Bearing Cap is available for parts service of the new cylinder block. The 9L8992 Bearing Cap is still available for parts service of the former cylinder block.

Caterpillar Information System:

1979/03/05 Main Bearings Now Have Larger Diameter Oil Hole For Better Lubrication Of Main And Rod Bearings{1203,1219,1300}

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}

1979/03/05 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}

1979/03/12 Larger Diameter Washer Is Used To Hold Air Transfer Pipe In Aftercooler Flange{1063,1058}