How Do You Set and Adjust a Valve Lash?

How Do You Set and Adjust a Valve Lash?

Adjusting the valve lash depends on the type of engine, and requires a feeler gauge to determine how tight or loose the valves are. The valve specifications all vary according to the make and model of the car, but will be specified inside a repair manual.

The first thing to do prior to adjusting the valves is to purchase a service repair manual that details all the needed specifications in terms of torque sequences. This guide will focus on adjusting a Honda Accord's engine valve lash. Other models will differ in terms of torque and clearance. After purchasing a service repair manual, use the following instructions to adjust the valves on a Honda Accord F-series engine.

  1. Remove the valve cover
  2. Pull out the PCV valve and loosen all of the valve cover bolts.

  3. Remove the timing belt cover
  4. Loosen and remove the bolts holding the timing cover in place. Once the cover is off, adjust the crank pulley to TDC.

  5. Adjust the exhaust valves
  6. Locate the two nuts for the front exhaust valve and rocket arm. Begin adjusting the valve by tightening the bolts clockwise and periodically checking the clearance with a feeler gauge. Once the rocker arm and valve stem clearances create a snug fit for the .012-inch feeler gauge, move on to the next one.

  7. Adjust the intake valves
  8. Repeat the same process above, but using a .01-inch feeler gauge. Continue the adjustment process until all of valves are adjusted, and then reassemble the engine.