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Hydraulic lash adjusters

Eaton's hydraulic lash adjusters are specifically designed to automatically adjust valve lash ensuring precise valve seating, optimized engine air flow, and precise fuel management. Our hydraulic lash adjusters ensure stable valvetrain operation during engine life, are maintenance free, and are key contributors to the reduction of engine NVH. Eaton hydraulic lash adjusters are designed for single and double overhead camshaft (SOHC and DOHC) valvetrains and overhead valve (OHV) or pushrod-type valvetrains in internal combustion and spark ignition engines.

eaton hydraulic lash adjusters 500x500

Eaton's hydraulic lash adjusters are specifically designed to automatically adjust lash in commercial vehicle engines with Type III and Type V valvetrains ensuring precise valve seating, optimizing engine air flow and fuel management.

The market leader in commercial engine hydraulic lash adjusters, our product designs include hydraulic roller follower, flat face nailhead tappet, and shaft-mounted rocker arms with hydraulic capsules.

Hydraulic lash adjusters internal design enables best-in-class oil reservoir ratio to ensure silent valvetrain functioning during engine cold start.

Hydraulic lash adjuster plunger and clipping design ensure highest side stiffness in the market and high resistance to side loads.

Specific coatings are available to reduce wear and friction losses.

Function of a hydraulic lash adjuster or lifter

  • Hydraulically maintains optimal valvetrain clearances
  • Compensates for both mechanical and thermal changes in the valvetrain to ensure the valve seals against the seat during every event
engine cylinder head cut away
Cut-away of overhead camshaft cylinder head showing valvetrain components

Key features and benefits:

Consistent Combustion

  • Hydraulic lash adjusters enable consistent lash throughout the life of the engine, resulting in consistent combustion

Reduced noise, vibration and harshness (NHV)

  • The internal design enables best-in-class oil reservoir ratio to ensure silent valvetrain function during engine cold start

Eliminates lash-setting maintenance

  • In medium- and heavy-duty diesel engines, valve adjustments are still a common maintenance practice.  This task is eliminated in engine designs utilizing our hydraulic lash adjusters and vehicle owners can save over $1,000 in labor costs over the life of the engine

Compact Packaging

  • Modern diesel aftertreatment systems have made diesel truck engine compartments a crowded environment. This makes adjusting the valves a difficult and time-consuming operation.  Since our hydraulic lash adjusters eliminate the need for routine valve lash adjustment, vehicle manufacturers can design more compact packaging for the engine and aftertreatment systems

Improved Dynamics

  • Hydraulic lash adjusters are a proven technology engineered to improve dynamic behavior by lowering valve seating velocities which equates to lower warranty costs
  • The plunger and clipping design ensure highest side stiffness in the market and high resistance to side loads

Compatibility with VVA

  • Eaton’s hydraulic lash adjusters design can be engineered to be used in combination with our variable valve actuation technologies
eaton hydraulic lash adjuster locations

Flexible locations

Because every situation is unique, our hydraulic lash adjusters can be placed in a variety of locations: in a roller lifter, in a flat-face lifter, as a capsule in a rocker arm, or in a pushrod or push tube.