Schaeffler North America

Valve train systems

Components with hydraulic valve lash adjustment

The engineers at INA were the pioneers in the market niche for low-maintenance valve trains in high-speed internal combustion engines – with direct valve activation by means of hydraulic tappets. Our new concept passed its first test in 1974 when it was adopted by Mercedes Benz for volume usage in the 8-cylinder engines for its luxury class vehicles – not least because of the significantly lower exhaust emissions from the lash-free valve train. At the same time, Porsche proved in preproduction tests in a racing car (917) that very high speeds could be achieved with our valve trains.

Advantages of automatic valve lash adjustment:

  • Simple engine assembly
  • Maintenance-free throughout the operating life
  • Very quiet valve train
  • Consistently low exhaust emissions throughout the operating life