GEAR-OUTPUT 1052487 - Caterpillar

All 3400 Machine EnginesSUPPLEMENT: 09/05/94Service Magazine; July 4, 1994; Page 11; "New Cylinder Head Gasket, Spacer Plate And Head Bolts Used; New Cylinder Liner Projection Measurement Method; New Cylinder Head Torque Sequence; Improved Coolant Flow (Cylinder Heads)".In the "SPACER PLATE SPECIFICATIONS" chart, in the "Serviceable Part No." column, the part number 6I1389 is NOT correct. The spacer plate part number is 6I3189.
--------------- END SUPPLEMENT ---------------Head Gasket (3406 only)
The former 7E6000 Cylinder Head Gasket has been replaced by the new 6I3066 Cylinder Head Gasket. This new gasket features a graphite body for added heat resistance. The body material will resist extrusion and provide better oil sealing capability. It can withstand occasional exhaust gas seepage past the fire ring better than the previous material. This body design results in a more flexible gasket that requires extra care in handling and storage.
Gasket body performance is maximized when assembled with clean, dry components. It is important to thoroughly clean the cylinder head bottom deck, liner flanges, and spacer plate with component cleaner or alcohol prior to gasket installation.
The fire ring material has changed from mild steel to stainless steel to provide improved combustion sealing. The wrap material remains stainless steel and retains its tab style retention method to the body material. One benefit of the new gasket design is a decrease in sensitivity to liner projection that is low in the specified range. Another benefit is the stainless steel fire ring in the 6I3066 Gasket is less prone to deformation through thermal cycling than the previous head gasket. More load is retained on the fire ring, thus reducing exhaust gas leakage. The retorquing of cylinder head bolts DOES NOT improve the performance of this gasket. See the chart for effective serial numbers.
Spacer Plates
The former aluminum spacer plates (standard thickness) have been replaced by the new steel spacer plates. The new plates provides added durability and reusability when compared to the former plates. The new plates are functionally interchangeable with the former plates. A wider selection of cleaning methods can be used with the steel plates than with the aluminum plates to simplify repair. In addition, new steel spacer plates are available for parts service. The spcer plates are 0.076 mm (0.003 in) thinner than the productions spacer plates. They can compensate for repairs that produce liner projection less than 0.076 mm (0.003 in). They can be used when liner projection across all the cylinder bank is consistent but near the minimum specification of 0.152 mm (0.001 in). If inspection of the block top deck reveals no measurable damage directly under the liner flanges, but the average liner projection is less than 0.076 mm (0.003 in), these new service spacer plates can be installed. Note: The use of the service spacer plate is situations that result in excessive liner projection [greater than 0.152 mm (0.006 in)] is not an acceptable repair.
See the "Spacer Plate" Chart for model usage and part numbers. See the "Effectivity Of Cylinder Head Joint Improvements" Chart for effective serial