GASKET 9Y3099 - Caterpillar

3406, 3406B Engines In All ApplicationsReference: Service Magazine; November 14, 1988; Page 7; "New Liner Seat Insert Available" for 3400 Family Of Engines equipped with spacer plates. Service Magazine; January 30, 1989; Page 10; "New Head Gasket Available (Used); Head Gasket Replacement Guidelines" for 3406 Family Of Engines.Description of Change: A new 7E6000 Cylinder Head Gasket is used on 3406B Engines in all applications. The new gasket has the following improvements over the former gaskets. ... A thicker fire ring to compensate for the asbestos-free body material. The thicker fire ring and thinner wrap help to prevent leakage of combustion gases, and give a better "crush" on the liner flange when the head is tightened.
... The overlap of the stainless steel fire ring wrap is reduced to give better gasket body loading and minimize the possibility of fluid leaks. The wrap has a tab-style design. This tab design results in a more flexible gasket that requires extra care in handling and storage.
... The rear and front edges of the gasket body are filled with gasket material between the bolt holes to give more support to the fire rings at both ends of the gasket. See illustration.
Locations of the filled-in ends on the new 7E6000 Gasket and on the temporary parts service 7E3240 Gasket. The added material shown at both ends also makes it possible to identify from the outside of the engine the new 7E6000 Gaskets from the former 2W7983 or 9Y7786 Gaskets. (A parts service only 7E3240 Gasket also had both ends filled in.)... This gasket is NOT coated on the cylinder head side. It DOES have a single layer of black Teflon® (PTFE) on the spacer plate side. The PTFE prevents sticking to the aluminum spacer plate. Adaptable To: The gasket is effective with the following engine serial numbers. 3406B Vehicular Engine: 70V311543406B Truck Engine: 4MG622773406 Truck Engine: 92U664433406B (PEEC) Truck Engine: 8TC85193406 Spark-Ignited Engine: 4FD1753406 Industrial Engine: 90U198093406B Industrial Engine: 6TB59503406B Generator Set Engine: 2WB72523406B Marine Engine: 4TB22163406B Generator Set Engine (Standby): 4RG446This new 7E6000 Gasket can be installed in place of the former 2W7983, 9Y7786, or 7E3240 Gaskets which are all canceled. For your information, a summary of their use on truck engines only and the features of these four gaskets are in the chart.
Any time the new head gasket is to be installed, refer to the following topics so that maximum life can be obtained from the new gasket, head, block, spacer plate, and engine block.
Liner Projection And Machining The Block And/Or Head
Do NOT adjust the liner projection above the block if it measures in the range of 0.03 to 0.15 mm (.001 to .006"). ALSO, make sure that the differences between all four measurements at any one cylinder do not exceed 0.05 mm (.002"). AND, the difference between the average projection of two liners next to each other must not exceed 0.05 mm (.002"). These specifications are in the Service Manuals for these engines.
Wear or erosion under the liner flange will require