191-6766 industrial spare part

The Caterpillar 191-6766 Cylinder Head Valve Guide is a high-temperature, wear-resistant reciprocating control component. It is engineered to maintain perfect axial alignment, ensure minimal structural lateral play, and maximize heat transfer away from the valve stem during intense gas combustion cycles subject to constant mechanical wear and thermal expansion.

Core Dimensions & Fastener Specs
Overall Length: 103.00 mm (4.055 in)
Component Type: Flanged / Cylindrical Press-Fit Valve Guide
Application Target: Cylinder head valve train assembly (Intake & Exhaust positions)
Net Weight: 0.120 kg (0.265 lbs)
Material & Manufacturing Specs
Material Grade: Premium high-density cast iron or specialized wear-resistant alloy steel.
Coating & Finish: Micro-honed inner diameter with specialized cross-hatch retention lining to hold localized oil lubrication and prevent high-frequency stem scuffing.
Manufacturing Standards: Fully engineered and certified under ISO 9001 systems to resist tight clearance galling, extreme temperature friction, and repetitive guide-to-stem impact.
Equipment & System Compatibility
This high-durability reciprocating guide valve is standard heavy-duty hardware deployed across a vast selection of large-scale Caterpillar industrial natural gas engines and power generation platforms:
Engine Platforms: Integrated into core cylinder head groupings for Caterpillar G3500-series large-bore gas engine configurations, explicitly supporting G3508, G3512, G3516, G3516B, and G3520 engine blocks.
Power Generation Systems: Widely used within the valvetrain systems of continuous heavy-duty generator sets, oilfield gas compression plants, and landfill co-generation setups relying on the gas-powered 3500 engine platform.
Part Cross-References
Alternative Part Names: Cylinder Head Valve Guide, Intake Valve Guide, Exhaust Valve Guide.
Alternative Part Numbers: 1916766, 191-6766, 191 6766.