Renault Coupes/Sedans/Wagons 1975-1985 Repair Guide

Valves

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REMOVAL





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Fig. Fig. 1 Common valve spring compressor tool used for valve removal



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Fig. Fig. 2 To remove a valve from the cylinder head, use a spring compressor tool on the valve spring ...



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Fig. Fig. 3 ... and compress the spring. Remove the valve keepers ...



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Fig. Fig. 4 ... then lift the spring off of the cylinder head



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Fig. Fig. 5 Take the valve seals off of the valve stems-some gentle prying may aid removal



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Fig. Fig. 6 Use a magnet and remove the spring shim before turning the cylinder head over



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Fig. Fig. 7 Turn the cylinder head over and withdraw the valve



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Fig. Fig. 8 Valve stems may be rolled on a flat surface to check for bends



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Fig. Fig. 9 Use a micrometer to check the valve stem diameter

  1. Remove the cylinder head, as described earlier.
  2.  
  3. Remove the rocker arm shaft assembly as described earlier.
  4.  
  5. Using a valve spring compressor, available in most auto parts stores, compress the valve springs, remove the keepers (they are also called keys or locks), remove the spring retaining collars and release the springs. Remove the springs and the base collars.
  6.  
  7. Some engines have rubber valve stem seals. If so remove these and discard them. Slide the valve from the valve guide.
  8.  

INSPECTION, CLEANING & REFACING



  1. Using a stiff wire, drill-mounted brush, remove all traces of carbon and other deposits from the valve.
  2.  
  3. Check the valves for cracks, excessive scoring or pitting and other damage. If cracked or excessively damaged, especially in the face area, replace them.
  4.  
  5. Check the valve stems for bending. If at all bent, replace the valve. Check the stem for wear; if the stem is worn beyond the diameter shown in the Valve Specifications Chart, replace it.
  6.  
  7. Using a valve grinding tool, reface the valves to the degree shown in the Valve Specifications Chart.
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  9. Coat the valve face with a dye such as Prussian Blue and insert it into the head. Holding the stem, turn the valve in its seat and carefully remove it. The dye should be distributed evenly on the valve face and seat. If not, check the angle ground on the seat. It may need regrinding. If no good contact can be established by grinding, replace the valve.
  10.  

INSTALLATION



  1. Coat the face of each valve with lapping compound and insert them into the head. Using a lapping tool, turn the valves in the seat to establish a finely honed and polished fit. Remove any left-over lapping compound.
  2.  
  3. Assembly is the reverse of removal. Make sure that the keepers are firmly seated. Make sure that the closer coils of the springs are at the bottom.
  4.  

 
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