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Home >> Mazda >> 2007 >> B4000 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 331 (Engine Mechanical - Overhaul) >> Valve Guide Inspection/Repair >> Valve Guide Repair

Valve Guide Repair

WARNING: This page is about a different car, the 2007 Mazda B3000, 2006 Mazda B3000, 2005 Mazda B3000, 2004 Mazda B3000, and 2003 Mazda B3000. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
  • Always reface the valve seat after the valve guide has been reamed, and use a suitable scraper to break the sharp corner (ID) left by the reamer at the top of the valve guide.
  • The interference angle of the valve and seat should not be lapped out. Remove grooves or score marks from the end of the valve stem, and chamfer it as necessary. Do not remove more than 0.254mm (0.010 in) from the end of the valve stem.
NOTE:
  • If oversize valve stems and oversize stem seals are not available, bore out original guide and install service bushing. Ream ID for specified clearance for standard size valve. Reface valve seat as required. Install standard size valve stem seal.
  1. Use a hand-reaming kit to ream the valve guide.
    Fig 1: Reaming Valve Guide
    G03312324Courtesy of MAZDA MOTORS CORP.
  2. Reface the valve seat.
  3. Clean the sharp edges of the valve guide inner diameter left by reaming.
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