1999/02/01 Caterpillar

New Piston And Rod Groups Used{1214,1215}

Usage:

G3408 (6NB),
G3412 (7DB, 3NK, 6ZM) Engines

Description of Change: New piston and rod groups are used on the above engines that are equipped with gallery cooled pistons. These new piston and rod groups include new piston body assemblies and new piston rings. The pistons and rings will allow a slight increase in oil consumption which will help reduce valve recession.

The G3408 (6NB) and G3412 (7DB) Engines require the same piston and rod group for both 9.7:1 and 8.5:1 compression ratios. Only the new rings are necessary to update these engines. (Note that the 8.5:1 compression ration engine is attained with a change to the camshaft and turbocharger. No camshaft or turbocharger changes are required on existing 8.5:1 compression ration engines.)

The G3408 (6RJ) and G3412 (3NK, 6ZM) Low Emission Engines require both a new piston body assembly and the new rings to achieve the target oil consumption.

Adaptable To: The chart identifies the new and former piston and rod groups and the new rings and piston body assemblies in each engine.

Caterpillar Information System:

1999/02/01 Bearing Specifications For 3408E And 3412E Hydraulically Actuated Electronically Controlled Unit Injector (HEUI) Hydraulic Drive Group{1714}

1999/02/01 Improved Cylinder Head Groups For G3400 Engines{1100,1101}

1999/01/01 Use 144-0235 Belt Tension Gauge To Check Belt Tension{7461,1357}

1999/01/01 Use 145-9342 Filter Crusher to Reduce Waste And Collect Oil{5720}

1999/01/01 Use 9U-5968 Hydrostatic Filter Group To Filter Contaminanted Oil{5050,3200,3218}

1999/01/01 Use 153-9630 PWM-Analog Test Group-Sensor Adapter Kit For DataView{1000,3000,4000,5000,6000}

1999/01/01 Use 131-5050 DataView Group and 131-5051 DataView Portable TechStation Group For Accurate Diagnostics{1000,3000,4000,5000,6000,0788}

1999/01/01 Use 149-5138 Mechanical Push/Puller For Extra Force In General Purpose Applications{0700}

1999/01/01 New 146-4080 Digital Multimeter Available For Troubleshooting Electronic Circuits{0115}

1999/01/01 EMCP II+ Has New Default Setpoints To Reduce Nuisance Shutdowns{4490,7451}

1999/01/01 Corrections To Special Instruction, REHS0181, Instructions For Mounting The Electronic Modular Control Panel II In A Remote Location{4490,7451}

1999/01/01 New Status Control Module (SCM) Provides Increased Engine Protection{7451}

1999/02/01 New Turbocharger Exhaust Coupling Used In Turbocharger Groups{1052,1061,1065}

1999/02/01 Use 152-2067 Differential Pressure Gauge To Monitor Aftercooler Pressure Drop In Applications With Crankcase Fume Recirculation{1063}

1999/02/01 Bolts, Washers, And Spacers Grouped Into Fastener Groups In Engine Cylinder Head Groups{1100}

1999/02/01 161-3995 Oil Filter Spring Group Available To Increase Oil Filter Element Seating Force{1306}

1999/02/01 Use FT2613 Cap Assembly For Adjusting 7E-3407 Gas Regulator{1715}

1999/02/01 New Lines Groups Available To Eliminate Leakage In Air Piping{1058,1071}

1999/02/01 New Exhaust Manifold Shield Assemblies Provide Increased Heat Protection For Wastegate Area{1067}

1999/02/01 Use 151-8689 Seal Template Tool For Cylinder Head Combustion Surface Inspection{1101}

1999/02/01 New Prechamber Assembly And Ignition Body Assembly In Prechamber Groups{1106}

1999/02/01 New Cylinder Head Gaskets (Combustion Rings) Available{1124}

1999/02/01 New Thicker Jacket Water Side Cover Help Prevent Coolant Leaks{1201}

1999/02/01 Crankshaft Oil Passage Plugs Should Be Checked For Tightness On Some Crankshafts At Engine Overhauls{1202}