1981/03/06 Caterpillar


Do Not Adjust The Fuel Setting Or High Idle Higher Than Necessary

Usage:


All On-Highway Truck Engines

The specifications for the fuel setting and high idle are given in Fuel Setting Information. These specifications have a tolerance that is also given in the Fuel Setting Information book or microfiche.

Some servicemen make adjustments to the high side of the tolerance, even when it is not necessary. For example, the static fuel setting specifications have a tolerance of ± .15 mm (± .005"). For a specification of 3.05 mm (.120 "), the adjustment would be correct from 2.90 mm (.115") to 3.20 mm (.125 ").

It is important to remember that adjustments to the high side of the tolerances can cause a reduction in fuel mileage [km/L(mpg)]. On some engines this reduction can be as much as 0.09 to 0.13 km/L or .2 to .3 mpg. This will not be acceptable to many customers, especially those who have economy series engines.

Caterpillar Information System:

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1981/03/06 New Turbocharger, Turbocharger Oil Lines Group And Aftercooler Air Lines Group Used
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1981/03/06 List Of Service Publications
1981/03/06 Changes Have Been Made To Caterpillar Service Literature
1981/02/04 New, One-piece Valve Lifter Used
1981/02/04 Inspection And Test Procedures To Follow When Fuel Ratio Control Does Not Operate Correctly
1981/02/04 Different O-ring Seal Now Used On The Oil Pump Suction Tube
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
1981/03/06 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
1981/03/06 New Governor Spring Available For Specific Engine Applications
1981/04/09 Low Engine Temperatures: Install Check Valve
1981/04/09 6V4163 Bit And 6V4164 Driver Now Available For Removal Of Bolts For Flyweight Carrier
1981/04/09 Correction To Torque Specification For Locknuts On Valve Clearance Adjustment Screws Of Engines Equipped With Jacobs Engine Brakes
1981/04/09 Special Studs And Nuts Available For Exhaust Manifolds On Engines Used In Heavy Load Conditions
1981/04/09 Two New Oil Filter Assemblies Available; Always Use Correct Oil Filter And Follow Caterpillar Change Intervals
1981/04/09 Cooling System Cleaner Removes Rust And Corrosion
1981/04/09 Correct Refill Capacity For Engine Oil
1981/04/09 6V3197 Spacer, 6V3041 Tool Group Available For Use During Removal And Installation Of Piston Pin Bearings
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