Exhaust Gas Valve (NRS) for C7.1, C6.6, andC4.4 Engines {1050, 108N} Caterpillar

Engine (Captive)

C7.1 (S/N: 7701-UP)

Generator Set

C7.1 GEN SET (S/N: MRP1-UP)

Industrial Engine

C4.4 (S/N: 4481-UP)

C6.6 (S/N: 6671-UP)

C7.1 (S/N: 8811-UP)

C4.4 (S/N: JKT1-UP)

Description Of Change: There have been some isolated instances of the exhaust gas valve (NRS) not responding, accompanied by a diagnostic trouble code 112-2 EGR Valve Not Responding. Diagnosis indicates that the valve has a build-up of excessive soot. The exhaust gas valve (NRS) seizes due to erosion of the clearance between the poppet valve stem and guide bush.

An improved design of exhaust gas valve (NRS) has been introduced.

Adaptable To:

Four Cylinder Engines

New 466-7876 Valve replaces 362-9416 Valve.

New 466-7877 Valve replaces 362-9417 Valve.

New 467-0550 Valve replaces 443-7434 Valve.

New 467-0554 Valve replaces 443-7435 Valve.

Refer to Special Instruction, Exhaust Gas Valve (NRS) for C4.4 Engines for the correct procedures to remove and install the exhaust gas valve (NRS).

Six Cylinder Engines

New 467-0529 Valve replaces 349-6733 Valve.

New 467-0543 Valve replaces 349-6734 Valve.

Refer to Special Instruction, Exhaust Gas Valve (NRS) for C7.1, and C6.6 Engines for the correct procedures to remove and install the exhaust gas valve (NRS).