CYLINDER HEAD AS 2842786 - Caterpillar

Earthmoving Compactor:
836 (S/N: 7FR1-UP)
Wheel Loader:
988F Series II (S/N: 2ZR1-UP)
Service Magazine SEPD0653, October 2002, "An Improved Front Gear Group is Available". Replace the above article with the article that follows.Reference: Special Instruction, REHS1374, "Installation of Improved Front Gear Group and Camshaft Assembly".Reference: Disassembly and Assembly, SENR1063, "Camshaft".An improved front gear group is now available as service replacement for the front gear groups of the 3408E Engines in the above listed machines. The new front gear group is redesigned in order to provide a wider gear tooth contact pattern for improved component operation and improved component life. The front timing gear housing must be modified in order to accommodate the increased width of the drive gear. Also, the front engine support may need to be modified in order to accommodate the new damper.The following service replacement parts are now adaptable for the 3408E (S/N: 99C) Machine Engines: 213-6349 Camshaft Assembly, 195-0316 Cluster Idler Gear and 195-0318 Gear (Camshaft Drive).The 213-6349 Camshaft Assembly may be used as a service replacement for the 108-6277 Camshaft Assembly. The 195-0316 Cluster Idler Gear may be used as a service replacement for the 7N-7584 Cluster Idler Gear. The 195-0318 Gear (Camshaft Drive) may be used as a service replacement for the 101-3374 Gear (Camshaft Drive).Conversion to the new camshaft drive gear and the cluster idler gear requires machining the inside of the 172-9313 Timing Gear Housing. The timing gear housing must be machined in order to accommodate the increased width of the 195-0318 Gear (Camshaft Drive). The required machining instructions are described in the above Special Instruction.Engines with the 105-9082 Engine Support (Front) must be modified. The 105-9082 Engine Support (Front) must be machined in order to accommodate the installation of the larger diameter 167-8132 Damper Assembly (Viscous). Do NOT modify the front support bracket by flame cutting. See the above Special Instruction for machining instructions.Engines with the 7E-6385 Engine Support (Front) does not require any modification to the front engine support when the 6N-2229 Damper Group and the 6N-6459 Crankshaft Pulley is used.