Do Not Use Heli-Coils® To Repair Rocker Arm Assemblies On 5.4" Bore Engines {1123}
Usage:
D346, D348, D349 Engines
Reference: Service Magazine; December 22, 1986; Page 13; "Use Heli-Coils To Repair 5.4" Bore Engine Rocker Arm Assemblies."
Caterpillar now recommends NOT to use Heli-Coils to repair threads in the rocker arm assemblies on the above engines. Field experience indicates that the rocker arms continue to wear even after Heli-Coils have been installed. Inspect the rocker arm assemblies either when the valves are adjusted or at overhaul. Use the "Procedure To Check For Excessive Thread Wear" in the reference article. If excessive thread wear is found, replace the rocker arm assembly.
Caterpillar Information System:
1988/12/19 New Piston Body Assemblies Used {1214}
1988/12/19 Correct Timing Specification {0374}
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}
1988/12/26 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}
1979/01/15 6V83 Emery Polishing Paper{0675}
1979/01/22 Current Chart For Dynamometer Adapters{0651,1000}