1981/02/04 Caterpillar


Different O-ring Seal Now Used On The Oil Pump Suction Tube

Usage:


3406 And 3408 Truck Engines

Description of Change: A different O-Ring seal is now used where the oil pump suction tube connects to the oil pump on 3406 and 3408 Truck Engines. See the illustration. The new O-ring is of a tan color and made from Viton while the former O-ring, which is of a yellow color, is made from Silicone. After a period of time, the O-rings made from Silicone can some times take a compression set and let air get into the oil pump suction line.

Adaptable As: The 5P5846 O-Ring Seal is a direct replacement for the 9M9647 O-Ring Seal in this application. The 9M9647 O-Ring Seal is still available for use in other applications.


Location where O-ring seal is used on oil pump suction tube.

Caterpillar Information System:

1981/02/04 New Front Housing Assembly And Gaskets Used
1981/02/04 6V3150 Engine Pressure Group And 6V3121 Multitach Group Are Available For Testing Engines
1981/01/23 List Of Service Publications
1981/01/23 Purchase 3208 And 3406 Truck Engine Operation Guides, Parts Books And Service Manuals Directly From Caterpillar
1981/01/23 Wrong Turbocharger Group Shown In Parts Book
1981/01/23 Larger Plug Used In The Ends Of The Rocker Arm Shaft Assembly
1981/01/23 Two Replacement Lights Available For 5P7277 Voltage Tester
1981/01/23 Thicker Layer Of Chrome Now Used On Governor Spring Guide To Extend Its Service Life
1981/01/23 Improvements Made To 5P9718 And 6V186 Disc Pads Used During Gasket Removal
1980/11/24 New Decals Permit Easier Identification Of Fuel System Settings On Most Truck Engines
1980/11/24 Check For Correct Spring Retainer On Oil Pump Bypass Valve When Oil Pan Is Removed
1980/11/24 Inspect All Engine Oil And Fuel Filter Elements Before Installation{1000,1261,1318}
1981/02/04 Inspection And Test Procedures To Follow When Fuel Ratio Control Does Not Operate Correctly
1981/02/04 New, One-piece Valve Lifter Used
1981/03/06 Changes Have Been Made To Caterpillar Service Literature
1981/03/06 List Of Service Publications
1981/03/06 High Concentration Of Aluminum In Oil Analysis Can Be The Result Of Rocker Arm Support Wear
1981/03/06 New Turbocharger, Turbocharger Oil Lines Group And Aftercooler Air Lines Group Used
1981/03/06 Later Pistons Have A Smaller Number Of Drain Holes In Oil Ring Groove
1981/03/06 Modification Of Flywheel Prevents Loose Clutch Pilot Bearing
1981/03/06 Do Not Adjust The Fuel Setting Or High Idle Higher Than Necessary
1981/03/06 Two New Exhaust Manifolds Available For Replacement Of Single Rear Manifold To Prevent Broken Studs
1981/03/06 Check Oil Level Carefully To Prevent Operation With Too Much Oil In Engine Crankcase
1981/03/06 New O-ring Seal Used In Egr (exhaust Gas Recirculation) Control Has Better Resistance To Heat Damage
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