Torque Increase For Cylinder Head Bolts{1101}
Usage:
D346, D348, D349 Engines
The torque specification has been increased for the cylinder head bolts on D346, D348, D349 Engines. The increase in torque will help eliminate head gasket oil leakage.
The new torque specifications are:
... First torque: 300 ± 14 N·m (225 ± 10 lb ft).
... Second torque: 395 ± 7 N·m (295 ± 5 lb ft).
... Third torque: 395 ± 7 N·m (295 ± 5 lb ft).
Caterpillar Information System:
1985/09/30 Restarting Engines Without A Fuel Priming Pump{1250,1258}
1985/09/30 Maximum Wear Limits Established For Camshaft Roller Followers{1209}
1985/09/23 List Of Mechanical Service Meters For Earlier 3500 Series Engines Using Mechanical Service Meters{1286}
1985/09/23 New Bleed Screw Used In Fuel Injection Nozzle{1254}
1985/09/23 New Keystone Ring Groove Gauge Available{0763}
1985/09/23 Procedure For Turning Pins And Bushings On Sealed And Lubricated Track{4175}
1985/09/16 New Air-To-Air Aftercooler Arrangement Used On Truck Engines {1063}
1985/09/16 New O-ring Seals And Additional Clamps Used In Instrument Panel Fuel Filter Differential Lines Group {1250}
1985/09/16 Engine Valve Lash And Fuel Injection Timing Adjustment Procedure {1100,1251}
1985/09/16 Keep Product Information System Up-To-Date {0330,0350,0373}
1985/09/16 Use Product Information System For Consists Of Engines With No Bills Of Material {0330,0350,0373,1000}
1985/09/16 Pressure Switch Has Been Improved {1419,7332}
1985/09/30 Conversion Group Available For Increased Power{0600}
1985/10/07 New Water Cooled Exhaust Manifolds Available; Existing Water Cooled Exhaust Manifolds Can Be Strengthened Or Salvaged{1059}
1985/10/07 Two, New Top Dead Center Magnetic Transducers Available{0651,0653,1214,1250}
1985/10/07 Dust Can Cause Generator Set Vibration{4450}
1985/10/07 O-Ring Seal Not Needed On Turbochargers{1052}
1985/10/07 Check Height Of Locating Dowels Before Installing Cylinder Head{1201}
1985/10/07 Digital Electric Tachometer Group Available{7462}
1985/10/07 Stronger Air Cleaner Support Assembly{1050,1051}
1985/10/14 Fuel Transfer Pump Improved{1256}
1985/10/14 New Fuel Pressure Switch Available{7490,7332,1419}
1985/10/14 "Routine" Mid-Life Roll-Ins Of Main And Connecting Rod Bearings No Longer Recommended{1230,1203,1219}
1985/10/14 Recommendations For Cooling Systems And Cold Weather Operation{1350}