1988/12/19 Caterpillar

Correct Timing Specification {0374}

Usage:

3406B (PEEC) Truck Engines

The correct timing specification for 3406B Programmable Electronic Engine Control (PEEC) Truck Engines can be obtained from the PEEC control itself by using an 8T8697 Electronic Control Analyzer Programmer (ECAP) equipped with the correct PEEC Service Program Module. The PEEC controls the timing based on load as well as engine rpm. Therefore, timing specifications based only on engine rpm, such as those typically published in the OT Microfiche, can be misleading. The specifications displayed by the ECAP on status display screen number 3 are correct for the current load and engine rpm, and should be used in checking injection timing. The "EST. DYN. TIMING" value displayed on this screen can be compared to the value measured using the 6V3100/8T5300 Timing Indicator to check for correct timing. If these values agree to within 2.5 degrees, the timing is correct. The 3406B (PEEC) Truck Engine Test Procedures, Form SENR3479-01, Procedure P-401, contains more complete information about checking injection timing.

Caterpillar Information System:

1988/12/19 Larger Valve Springs Must Be Used With Williams Blue Ox® 485 kPa (70 psi) Exhaust Brake; New Spring Compressor Group Available {1108,1109,1119,0702,0703}

1988/12/19 Check Assembled Dimension For Rack Lever Travel If Governor Housing Assembly Is Replaced {1264}

1988/12/19 New Camshafts Used; Camshaft Installation Kits Available {1209,1210}

1988/12/19 New Material Used For Rotating Seal Rings In Some Power Shift Transmissions, Steering Clutches And Torque Converters {3101,3150,4100}

1988/12/12 Valve Kit Available For Explosion Relief Valve{1201,1233}

1988/12/12 Oil Cooler Bypass Elbow Changed To Prevent Bypass Valve Seizure{1314,1318}

1988/12/12 New Alternator Drive Pulley Has Hardened Wear Sleeve; New Seal Used On Pulley{1425,1357}

1988/12/12 Maintenance Procedure Extends Service Life Of Exhaust Manifold Studs{1050}

1988/12/12 New Mounting Bolts Used In Aftercooler Housings{1063,1058}

1988/12/12 Revised Instructions For Installation of New Maintenance Free Batteries{1401,1400}

1988/12/05 Improved Air Conditioner Thermostat Switches Have Tin-Plated Internal Parts{7320}

1988/11/28 Bleed Holes Now In Paddle In Air Inlet Shutoff Groups {1078}

1988/12/19 New Piston Body Assemblies Used {1214}

1988/12/19 Do Not Use Heli-Coils® To Repair Rocker Arm Assemblies On 5.4" Bore Engines {1123}

1988/12/26 Check Load Height Before Transporting Machines {7500}

1988/12/26 New Screw Used In BrakeSaver Water Lines Group {1155}

1988/12/26 Remove Fuel From Electronic Control Module (ECM) Before Shipping {1705}

1979/01/08 Prevention Of Fires On Hydraulic Excavators{7000,5057}

1979/01/08 Check The Adjustment Of The Original Tachometer Before A New Tachometer Is Installed{7462}

1979/01/08 A New 6V29 Sleeve Metering Fuel System Pump Roll Pin Tool Is Used To Adjust And Make A Replacement Of Roll Pins In The Fuel Injection Pump Housing{0626}

1979/01/08 New 6V87 Gauge Measures Valve Stem Wear{0653,1105}

1979/01/08 Improved Woodward Governor Groups{1264,1289}

1979/01/15 5P9705 Tapered Rod Tool Group Used For Removal And Installation Of Piston Pin Bearings In Tapered Connecting Rods{0622,1214,1218}

1979/01/15 Removal And Installation Of Taper Type Bearings{0622,1214,1219}