2) Fitment: 2.1) Perfect Fit for PACCAR Engines — Specifically engineered to fit and function with PACCAR MX-13 and MX-11 engines. Provides the exact clearance reference needed for proper engine brake adjustment and valve lash service. 3) Application: 3.1) Offset Valve Tappet Gauge Set & Engine Brake Feeler Gauge Tool is designed for use when setting valve tappets and makes valve lash adjustment easy. 3.2) Engine Brake Feeler Gauge Tool is designed for help to adjust the gap between the engine brake blades and the engine exhaust valve, providing appropriate clearance to ensure vehicle braking and deceleration. .
