GM Metro/Sprint 1985-1993 Repair Guide

Valve Lash

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INSPECTION AND ADJUSTMENT



See Figures 1 and 2



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Fig. Fig. 1: Adjusting valve lash for cylinder No. 1



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Fig. Fig. 2: Slide the thickness gauge between the adjusting screw and the valve tip. It should be a snug fit.

Sprint

Always check the valve lash with the engine cold.

  1. Remove the air cleaner and cylinder head cover.
  2.  
  3. Rotate crankshaft clockwise and align timing notch on crankshaft pulley with the 0 mark on the timing tab.
  4.  
  5. Remove the distributor cap and check if the rotor is positioned correctly (pointing toward the No. 1 cylinder terminal on the cap).
  6.  
  7. If the engine is not positioned correctly, rotate 360 degrees and align the timing notch with the 0 mark again.
  8.  
  9. Using a thickness gauge, check the intake and exhaust valve of the No. 1 cylinder. Slide the gauge between the adjusting screw and the valve tip. It should be a snug fit.
  10.  
  11. If the valve lash is out of specification, adjust it by loosening the locknut and turning the adjusting screw. Tighten the locknut to 11-13 ft. lbs. (15-19 Nm).
  12.  
  13. Rotate the engine 240 degrees and align the timing notch on the pulley with the left attaching bolt of the timing belt outside cover. Check and adjust the valve lash for No. 3 cylinder.
  14.  
  15. Rotate the engine 240 degrees and align the timing notch on the pulley with the right attaching bolt of the timing belt outside cover. Check and adjust the valve lash for No. 2 cylinder.
  16.  
  17. Install the distributor cap, cylinder head cover and air cleaner. Tighten the cylinder head cover bolts to 48 inch lbs. (5 Nm).
  18.  

Metro

The Metro engine is equipped hydraulic valve lash adjusters which require no adjustment. If a tapping noise is noticed at idle, inspect the valve train components for excessive wear.

 
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