1977/05/09 Caterpillar

New Rotor Assembly For Engine Oil Pump Has A Drilled Passage For Better Lubrication Of Oil Pump Bearing{1304}

Usage:

3208 Engines in All Applications

Description of Change: A new rotor assembly with a 0.093" (2.36 mm) diameter drilled passage from the lobe profile to the outer bearing is used in the above engines. Also, a new oil pump bearing with a tighter press fit is used. Formerly, bearing seizure was possible because of limited lubrication to the bearing, especially in cool weather with thick oil.

Adaptable As: The new 9N3207 Rotor Assembly is a direct replacement for the former 9N949 Rotor Assembly which is canceled. The new 9N2856 Oil Pump Bearing is a direct replacement for the former 9N242 Oil Pump Bearing which is canceled. It is not necessary to install the new parts together, but to be sure of good lubrication our recommendation is to install the new parts at the same time.

INSTALLATION: Use the tools shown in the respective Service Manual and install the 9N2856 Oil Pump Bearing as shown in the Illustration.

Assemble 9N2856 Oil Pump Bearing with joint as shown.

Caterpillar Information System:

1977/05/09 Special Torque Wrenches Use Noise As Indication Of Correct Torque Application{0614}

1977/05/02 Special Tools For Complete Repair Of Water Pump In Direct Injection Engines{0620,1361}

1977/05/02 Improved Keystone Piston Assembly{1214,1216}

1977/05/02 Improved Cylinder Block With Spacer Plate Used With New Cylinder Heads, Cylinder Head Gaskets, Cylinder Liners And Timing Gear Housing{1101,1162,1201,1216}

1977/04/25 New Socket Assembly To Tighten The Bolts That Fasten The Sleeve Levers To The Sleeve Shaft{0621,1250}

1977/04/25 Revision Of Engine Data Sheet Gives Important Information On Single-Bearing Generators Assembled To Cat Engines{1156,4450,0354}

1977/04/25 Improved 5P3000 Engine And Transmission Shipping Stand Assembly; Modification Available For Stands Already In Use{0640}

1977/04/25 New Oversize Connecting Rod Bearings Have Improved Design And Material{1219}

1977/04/25 New Piston Pin Bearing Used In Connecting Rod Assembly{1218}

1977/04/25 Alternator Groups With Slower Drive RPM Used Again{1205,1405}

1977/04/18 Guide Assembly For Dipstick (Oil Level Gauge) Now Has Thicker Walls{1300}

1977/04/18 Gasket For Water Temperature Regulator Now Has Larger Vent Passage{1355,7555}

1977/05/09 Shorter Bolts Now Used In Exhaust Manifold Support{1059}

1977/05/09 Improved Air Cleaner Group{1051}

1977/05/09 New Information On Caterpillar Cooling System Inhibitor{1350}

1977/05/09 New Fuel Nozzle Assembly Available{1254}

1977/05/16 Correct Installation Of Valve Lifters On The Camshaft Is Very Important To Prevent Failures{1209}

1977/05/16 New 5P4185 Fuel Pump Timing Pin To Be Used Only On 3408 And 3412 Engines{0650,1257}

1977/05/16 Stronger Guide Assembly For Oil Level Gauge Used On Caterpillar-Built Engines In Massey-Ferguson Tractors{1300}

1977/05/16 Use Special Instruction Form SEHS6929 For Repair And Maintenance Information On All Roll-Over Protective Structures (ROPS){7323,7325}

1977/05/16 Flare Nut Wrenches Available{0610}

1977/05/23 Parts In 1P3075 Seal Puller Group Available Separately{0621,1160,1161}

1977/05/23 Orifice In Oil Supply Passages Of BrakeSaver Stator Prevent Seal Leakage{1155}

1977/05/23 Install New Plugs To Prevent Oil Leaks At The Oil Filter Base{1306}