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Home >> Mercedes Benz >> 1985 >> 500SEC >> Repair and Diagnosis >> Engine Mechanical >> Engine Mechanical - V8 >> Valves >> Valve Guide Servicing

Valve Guide Servicing

  1. With cylinder head removed, clean bores of valve guides. Hard carbon deposits can be removed with a honing needle.
  2. Using a plug gauge, inspect valve guides for wear. Inner diameter of inlet and exhaust guides should be .354-355" (9.00-9.01 mm). If guide is beyond tolerance, replace with new guide.
  3. With mandrel, drive or press worn guide from combustion chamber side of cylinder head. Inspect valve guide bore in cylinder head and ream to accept next oversize guide.
    NOTE: Replacement intake valve guides are available in overlapping sizes, ranging from .559-.599" (14.21-15.22 mm) outside diameter. Exhaust valves are .598-.599" (15.198-15.222 mm).
  4. Heat cylinder head to approximately 194°F (90°C), or cool valve guide. Coat guide bore with oil and using mandrel, seat new guide in bore.
NOTE: Be sure snap ring is properly installed. Recheck valve guide clearance and that valve moves freely in guide.
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