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Home›Repair guides›VALVE FACE RUNOUT SPECIFICATION

G5 — VALVE FACE RUNOUT SPECIFICATION

For the G5.

Before you start

  • Valve grinding should only be done by ©
  • When valve faces are ground, it is 7
  • not to nick valve m:40

Procedure

  1. Inspect combustion face for evidence of physical damage, oi! or coolant leakage, or gasket failure prior to cleaning the cylinder head. Repair or replace cylinder head if there is evidence of physical damage; such as cracking, abrasion, distortion, or valve seat “torching”’. Inspect all cylinder head passages for restrictions.
  2. Scrape gasket material, oil, carbon, and rust from head. Use a powered wire brush to clean sealing surfaces.
  3. Clean cylinder head in a chemical hot tank, or with solvent and a brush. IMPORTANT: Be sure to remove all plugs before cleaning head, as parts can be damaged or destroyed by hot tank solutions.

Specs & torque values

  • 0.05
  • 0.002

Source: manual:Component Technical Manual 8.1L 6081 1994.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.