10.5:1 And 11:1 Compression Ratio Cylinder Head Recommendations Caterpillar

10.5:1 And 11:1 Compression Ratio Cylinder Head Recommendations

Usage:

ENGINESG3612 (1YG),
G3616 (4CG) ENGINES

Reference: January 26, 2000 Engines TIB, Component Code 1105, "Exhaust Valve Recession"

Problem:

Early exhaust valve recession has been noted on the above engines, which are operating with the 161-1205 Cylinder Head Group (0R-9478 Remanufactured Cylinder Head Group) or the 171-3995 Cylinder Head Group (0R-9752 Remanufactured Cylinder Head Group). These cylinder head groups where released for installation on the 10.5:1 and 11:1 compression ratio engines. The 149-0588 Exhaust Valve (made from Nimonic 80A material) is used in these cylinder heads. It has been found that this exhaust valve recedes at a rate faster than the Stellite 1 exhaust valve.

Solution:

Cylinder heads installed on G3600 Engines with 10.5:1 or 11:1 compression ratios should have Stellite 1 exhaust valves. The following recommendations are being made as a containment plan. These recommendations should be followed until further notice.

Engines using the 161-1205 Cylinder Head Group (0R-9478 Remanufactured Cylinder Head Group) should use the 155-4093 Cylinder Head Group (0R-9264 Remanufactured Cylinder Head Group).

Engines using the 171-3995 Cylinder Head Group (0R-9752 Remanufactured Cylinder Head Group) should use the 171-3994 Cylinder Head Group (0R-9794 Remanufactured Cylinder Head Group).

A Product Improvement Request has been opened, and a new cylinder head configuration is being developed for 10.5:1 and 11:1 compression ratio applications. This new cylinder head configuration would include exhaust valves with Stellite 6 material.