LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 90 (3.8L V6 Gas - VIN [L]) >> Overhaul >> Cylinder Head Overhaul >> Valve Guides

Valve Guides

WARNING: This page is about a different car, the 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Chrysler Town & Country. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check valve stem-to-guide oil clearance. Ensure valve stem diameter is within specification. Ensure valve guide I.D. and oil clearance is within specification.
  2. Valve guide must be reamed for valve with oversize valve stem if oil clearance or valve guide I.D. exceeds specification. See CYLINDER HEAD SPECIFICATIONS  table under ENGINE SPECIFICATIONS.
    NOTE: DO NOT  ream valve guides from standard to maximum oversize in one step. Ream valve guides to oversize in gradual steps so valve guides are reamed true in relation to valve seat. After reaming valve guides, valve seat runout must be checked.
  3. Valves are available with oversize valve stems of .005" (.13 mm), .015" (.38 mm) and .030" (.76 mm). Cylinder head must be replaced if valve guide cannot be cleaned using a .030" (.76 mm) reamer.
scientia non olet · About LEMON Manuals