1986/07/01 Caterpillar


Changes Have Been Made To 0T Microfiche (Fuel Setting And Related Information)

Usage:


All Caterpillar Truck Engines

Reference: Truck Engine News, November, 1985, Page 2, "Comparison Of Fuel Timing Tolerances For Field Settings ".

Changes which were announced earlier in the above reference article have now been made in the 0T microfiche. They are summarized as follows:

... Static (or pin) timing tolerance is now ±2°.
... For all engines with rated load rpm above 1200, "TIMING DEGREES AT LOW IDLE" is changed to "TIMING DEGREES AT REF (reference) RPM " and a speed of 1000 rpm is indicated. (Dynamic fuel timing measurements using the 6V3100 Timing Indicator Group are not recommended at speeds below 1000 rpm.)

NOTE: In the recently revised 3406B Diesel Truck Engine Service Manual, Form SEBR0544-01, the term "Base RPM" is used. This is the same as "Ref RPM ".

... Tolerance for "TIMING DEGREES AT REF RPM ", "TIMING DEGREES AT START RPM" and "TIMING DEGREES AT MID RPM " is now ± 1.5°.
... Tolerance for "TIMING DEGREES AT STOP RPM " is now ± 2.5°.
... Timing advance specifications for 3406B New Scroll engines ONLY now include port effect advance per 100 rpm. (All other engines are per 100 rpm.)
... "OCCURRENCE NO." is a new data field added under the timing advance group number. This will be useful information in the near future when PREPLOTTED timing advance specifications are available to dealer service personnel.
... The required QUANTITIES of each spring and spacer in a torque control group are now specified.

These changes coincide with the 030386 0T Fiche issue date.

Caterpillar Information System:

1986/07/01 New Engine Timing Indicator Group Available
1986/07/01 Valve Lash Adjustment Interval Is Changed
1986/07/01 Some 3406B Truck Engines With ATAAC Do Not Have Fuel Ratio Controls
1986/07/01 Service Parts Containing Asbestos Are Now Labeled
1986/07/01 Brushless Alternators May Not Charge In Certain Conditions
1986/07/01 New Service Tools Available
1986/07/01 Changes To 3208 Naturally Aspirated Truck Engines For 1986 Model Year
1986/06/01 Caterpillar Offers Used Truck Engine Warranty
1986/06/01 Black Nylon Fuel Seals For Lockwire Available Only To NACD Dealers For Certain Customers
1986/06/01 Determining The Cause Of Glow Plug Tip Failures
1986/06/01 New Paper Towels Available
1986/06/01 Cleaning Procedure For Air-To-Air Aftercooler On ATAAC Engines
1986/07/01 Caterpillar Mini Cutting Torch Available
1986/07/01 List Of Metal Surface Reconditioning Products Available From Caterpillar
1986/07/01 Prevent Gasket Leakage On 3406B Truck Engines Equipped With Jake Brakes
1986/07/01 Increase Piston Reuse With Keystone Piston Ring Gage Group
1986/07/01 Update Information For Caterpillar Fuel Injection Equipment Test Stand
1986/07/01 New Oil Pump Gears Used
1986/08/01 New Material Used For Disc In Valve Assemblies In Fuel Transfer Pump Groups
1986/08/01 SIMS Reports Must Be Correctly Completed To Be Entered In Data System
1986/08/01 Inspection And Replacement Of Fluid Conductors
1986/08/01 Oil Cooler Gasket Has Improved Material
1986/08/01 Southern California Trucker Cuts In-frame Overhaul Time With Caterpillar Cylinder Pack Removal Tool
1986/09/01 Indications Of Engine Overspeeding When Only One Cam Lobe/Lifter Has Failed
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