1977/05/25 Caterpillar


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

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:

1977/05/13 New Fuel Nozzle Assembly Available
1977/05/13 Gasket For Water Temperature Regulator Now Has Larger Vent Passage
1977/05/13 Improved Keystone Piston Assembly
1977/05/13 Improved Air Cleaner Group
1977/05/13 Guide Assembly For Dipstick (Oil Level Gauge) Now Has Thicker Walls
1977/05/13 New Crankshaft Front Seal And Wear Sleeve Permit Crankshafts With Seal Wear To Be Used Again
1977/05/13 New Information On Caterpillar Cooling System Inhibitor
1977/05/13 New 5P4185 Fuel Pump Timing Pin To Be Used Only On 3408 And 3412 Engines
1977/05/03 New Socket Assembly To Tighten The Bolts That Fasten The Sleeve Levers To The Sleeve Shaft
1977/05/03 Improved Cylinder Block With Spacer Plate Used With New Cylinder Heads, Cylinder Head Gaskets, Cylinder Liners And Timing Gear Housing
1977/05/03 Special Tools For Complete Repair Of Water Pump In Direct Injection Engines
1977/04/22 List Of Service Publications
1977/05/25 Shorter Bolts Now Used In Exhaust Manifold Support
1977/05/25 Flare Nut Wrenches Available
1977/05/25 Self Locking Bolts Or Hardened Washers Used In Place Of Sheet Metal Locks
1977/05/25 Orifice In Oil Supply Passages Of BrakeSaver Stator Prevent Seal Leakage
1977/05/25 Correct Installation Of Valve Lifters On The Camshaft Is Very Important To Prevent Failures
1977/05/25 Parts In 1P3075 Seal Puller Group Available Separately
1977/06/08 Improvements To Fuel Injection Pump And Governor
1977/06/22 Water Pump Has Stronger Pulley
1977/06/22 New Adapter Group For Use With Fuel Injection Test Bench
1977/06/22 List Of Service Publications
1977/06/22 Fabricated Tools For Assembly And Disassembly Of 7271 Marine Transmission
1977/06/22 New Gasket Used At The Outlet Flange On Heavy-Duty Air Cleaner Group
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