4938859 MANIFOLD,EXHAUST, REPLACES 3972390 (REF. 07T11-12, TSB100581)

Exhaust manifold, Part Number 4938859, supersedes the present production exhaust manifolds, Part Number 3972390. The new exhaust manifold will not be implemented in Komatsu applications. Komatsu will continue to use the old exhaust manifold, Part Number 3972390. Exhaust manifold option TB91141 contains an option note that states 'Only KCEC can use 3972390 exhaust manifold in place of exhaust manifold, Part Number 4938859. See attached Technical Service Bulletin for full details.