INA 156-050-02-25 Hydraulic Valve Lifter

The INA 156-050-02-25 is a precision-engineered hydraulic valve lifter designed to maintain zero valve clearance and eliminate the need for manual lash adjustment. This component automatically compensates for valve train thermal expansion by using hydraulic oil pressure to maintain constant contact between the camshaft and valve mechanism, resulting in quieter operation and reduced wear.

Key Features:

• Precisely machined to meet or exceed OEM specifications for optimal valve operation
• Premium construction designed to withstand high temperatures and engine stress
• Self-adjusting hydraulic design eliminates periodic valve clearance adjustments
• Reduces valve train noise and extends engine component life
• OE-quality replacement manufactured by INA, part of the Schaeffler Group

Hydraulic valve lifters operate by filling with pressurized engine oil, which acts as an incompressible medium during camshaft lift phases. This design ensures consistent valve timing and smooth engine performance across all operating temperatures. When hydraulic lifters fail, symptoms typically include ticking or knocking noises from the valve train, particularly noticeable at idle or cold start.

Cross-Reference Numbers: INA 420-0217-100 (4200217100), Mercedes OEM 1560500225