CAP-PRESSURE VALVE 2874786 - Caterpillar

All 3408 Truck EnginesSUPPLEMENT: 05/23/84TRUCK ENGINE NEWS, FEBRUARY 15,1984, PAGE 4. The article "Procedure To Remove Sharp Edges From Fuel Racks" says that some fuel racks with a flat root surface might have sharp edges. Change the article to say that only the racks with a round root surface might have sharp edges on the teeth.--------------- END SUPPLEMENT ---------------There have been reports that some of the fuel racks on the above engines may have sharp edges on the teeth. These sharp edges can cause wear on the fuel injection pump gears.
The racks used on these engines have two different designs. Only the racks with the flat root surface might have sharp edges on the teeth. The other racks have a round root surface. See the illustration.
To remove the sharp edges from the fuel racks, use an abrasive fiber grinding wheel (brush) on a bench grinder. There are two different grinding wheels (brushes) that can be used. A 6V2033 Brush is available from the parts department. Also, a Master Grit Brush can be used. The Master Grit Brush, Code 8072-22328, is available from:
The Osborn Manufacturing Corp.
5401 Hamilton Avenue
Cleveland, Ohio 44114
U.S.A.
Phone: 216-361-1900
Use one of the above brushes to put a .15 to .30 mm (.006 to .012 ") radius on each tooth. Less time will be needed to grind the radius on each tooth if the Master Grit Brush is used.
The rack may become hot when the radius is made on each tooth. Do not use water to lower the temperature of the rack.
Make sure all the abrasive material is removed and the rack is clean before it is installed in the pump housing.
Grind a radius at these locations on the racks that have a flat root surface.