1978/05/03 Caterpillar


Timing Dimension For Fuel Injection Pumps Changed; 1P7410 Timing Plates Have More Exact Degree Marks

Usage:


3406 Truck Engines With Direct Injection Fuel Systems And Turbocharged (California Only) Or Turbocharged And Aftercooled

Two new arrangements of the 3406 Truck Engine are available. Each arrangement has a different timing dimension for the fuel injection pump. The 3406 Truck Engine (300 HP at 2100 RPM and 300 HP at 1900 RPM) with direct injection and a turbocharger (California only) has a 22.5° BTC (before top center) static timing. The 3406 Truck Engine (350 HP at 1900 RPM) (not available in California) with direct injection, a turbocharger and an aftercooler has a 26.5° BTC static timing. All other 3406 Engines with direct injection have a 28° BTC static timing.

To check the timing dimension, use the 5P6600 Timing Fixture Group and Special Instruction Form SMHS7130.

NOTE: Until revisions are made to Special Instruction Form SMHS7130, use the chart that follows for the new arrangements of the 3406 Truck Engine. See the Special Instructions for the tools needed.

When early 1P7410 Timing Plates are used to check the lifter setting on these new arrangements, Form SEHS7306 must also be used. Form SEHS7306 is made up of six decals with marks every .5° that are to be attached to the 1P7410 Timing Plate at six specific locations. These decals permit a serviceman to read the .75° dimensions for the new 3406 Truck Engine Arrangements. Later 1P7410 Timing Plates will have marks every .5° instead of the present 1° intervals. Install the decals over the degree marks between the degree ranges that follow: 40° to 60°, 100° to 120°, 160° to 180°, 220° to 240°, 280° to 300° and 340° to 360° (see the illustration).


Decal installed on 1P7410 Timing Plate.

Caterpillar Information System:

1978/05/03 Do Not Use The 5B1401 Cleaning Tool Group To Clean The Orifice In Capsule-Type Fuel Injection Nozzles
1978/05/03 New Type Seal Used On Water Separator Elements
1978/05/03 Double-Walled Fuel Injection Lines Protect Unattended Industrial And Marine Engines
1978/05/03 Stronger Weights And Gear Used In Automatic Timing Advance
1978/05/03 Shorter Hoses Now Used For The Actuator Control Valve In The Exhaust Gas Recirculation System
1978/04/19 Cylinder Block Has New Cover With An Oil Return Connection For Rockford Fan Drive
1978/04/19 Improved Water Separator Element And Retaining Clamp Stops Fuel Leakage
1978/04/19 New 5P9693 Reusable Cable Tie For Storage Of Wires, Cables And Tubing
1978/04/19 Use 6V100 Tool Arrangement To Remove And Install Piston Pin Bearings For Both Tapered And Standard Connecting Rods
1978/04/19 Improved Yoke, Hardened Washer And More Torque Keep Valve Lifter Guides Tight
1978/04/19 New Lifting Eye Group Used On 3412 Industrial Engines Equipped With Turbochargers
1978/04/05 More Torque Now Used To Tighten The Retainer Nut For Turbocharger Compressor
1978/05/03 Procedure For Alignment Of Transmission Mounting Parts On 1100 Series And 3208 Truck Engines With Allison MT640, MT650, And AT540 Series Transmissions
1978/05/03 Oil Grooves And Harder Gears Are Now Used In The Oil Pump On 6.25" Bore Vee Engines
1978/05/03 List Of Service Publications
1978/05/03 New 5P7335 Rack Adjusting Tool Available
1978/05/03 Longer Hoses Used At Radiator Lower Hose Connections
1978/05/03 O-Ring Seals Of A Different Material Are Now Used On The Outside Diameter Of The Servo Cylinder In Governors
1978/05/03 Improved Oil Suction Tube Assembly
1978/05/03 New 5P8709 Piston Tool Group For The Alignment Of Piston Cooling Jets
1978/05/03 One-Piece Seat Used For Governor Spring
1978/05/03 Possible Problems With Fuel Filters
1978/05/03 External (Outside) Oil Lines Now Used Instead Of The Oil Passage In The Cylinder Block And Flywheel Housing
1978/05/03 New Oil Pressure Gauge Available For Marine Transmissions Used On D348, D349, D353, D379, D398, D399, 3406 And 3408 Marine Engines
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