1639256 Guide-Ex Semifinish Fits Caterpillar Models

One New Aftermarket Replacement Exhaust Valve Guide (Semifinish) for Caterpillar (Cat) 3054 / 3056 Series Engines

This aftermarket exhaust valve guide is a direct replacement for Caterpillar (Cat) OEM part number 1639256 (163-9256). The guide is supplied in a semifinish bore condition, meaning the bore requires final reaming to size upon installation -- a standard practice for precision valve guide fitment in diesel engine rebuilds. It is installed in the cylinder head and controls exhaust valve stem alignment, heat transfer, and oil consumption. Compatible with Caterpillar 3054, 3054B, 3056, and 3056E engines as fitted across a wide range of Cat construction and compaction equipment.

Compatible Models

Caterpillar Engines: 3054, 3054B, 3056, 3056E

Caterpillar Excavators: 312B L, 312C, 315B L

Caterpillar Backhoe Loaders: 416C, 416D, 420D, 424D, 426C, 428C, 428D, 430D, 432D, 436C, 438C, 438D, 442D

Caterpillar Wheel Loaders: 908, 924G, 924GZ, 930G

Caterpillar Asphalt Pavers: AP-655C, AP-800C

Caterpillar Forestry / Feller Bunchers: 550B, 554, 560B, 564, 574B

Caterpillar Vibratory Compactors: CB-434C, CB-534C, CB-535B, CP-433C, CP-433E, CP-573E, CP-663E, CS-323C, CS-423E, CS-431C, CS-433C, CS-563E, CS-583E, CS-663E, CS-683E

Replaces Part Number(s):

1639256, 163-9256

Aftermarket Interchange Numbers

138-2058

New aftermarket replacement part - not remanufactured, not used.