Renault Coupes/Sedans/Wagons 1975-1985 Repair Guide

OHV Engines

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GENERAL INFORMATION



Proper valve lash adjustment is critical for proper engine performance. As an engine runs, the valves open and close to admit air and fuel, and release exhaust. While the valves are closed, they transfer excess heat to the valve seat, thereby maintaining an acceptable operating temperature. If the valves are adjusted too tight, they will not stay closed long enough or may not close at all, and could overheat or burn. If the valves are adjusted too loose, a distinct tapping noise is heard as the rocker arms beat on the valve tips, causing premature wear. Also, too loose an adjustment decreases the distance the valve opens, thereby reducing the amount of air/fuel admitted, and/or the amount of exhaust released, causing a lack of engine power.

To properly adjust the valves, follow the appropriate adjustment procedure below. Insert the proper size feeler gauge between the valve tip and the rocker arm. A slight drag should be felt. If the gauge will not fit, the valve is too tight. Loosen the locknut, then tighten the adjuster until a slight drag is felt. Tighten the locknut while holding the adjuster, then recheck the clearance.

ADJUSTMENT



Except 2.2L Engine

Valve adjustment should be done through manual maintenance or when the cylinder head bolts are retorqued.

  1. Rotate the engine in correct rotation until the exhaust valve for the No. 1 cylinder is fully open.
  2.  
  3. Adjust the rocker arms of the intake valve for the No. 3 cylinder and the exhaust valve for the No. 4 cylinder.
  4.  
  5. Rotate the engine in correct rotation until the No. 3 cylinder exhaust valve is fully open. Adjust the rocker arms of the intake valve for the No. 4 cylinder and the exhaust valve for the No. 2 cylinder.
  6.  
  7. Rotate the engine in correct rotation until the No. 4 cylinder exhaust valve is fully open. Adjust the rocker arms of the intake valve for the No. 2 cylinder and the exhaust valve for the No. 1 cylinder.
  8.  
  9. Rotate the engine in correct rotation until the No. 2 cylinder exhaust valve is fully open. Adjust the rocker arms of the intake valve for the No. 1 cylinder and the exhaust valve for the No. 3 cylinder.
  10.  
  11. Rotate the engine in the correct rotation, and recheck the rocker arm adjustments for proper specification clearances.
  12.  

 
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