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Cummins/Onan QG7000i DF — Valve Clearance Adjustment

Adjustments · Cylinder head / valve

For the Cummins/Onan QG7000i DF, from the Cummins/Onan service manual.

Applies to: Cummins/Onan RV Generator Set

Before you start

  • For accurate adjustments, valve lash must be adjusted when the engine is at room temperature.

Procedure

  1. Remove the spark plug to make it easier to turn the engine.
  2. Remove the cylinder head cover and confirm the timing point at TDC of compression stroke.
  3. Measure intake and exhaust valve clearance with a thickness gauge.
  4. Fix the valve adjusting screw and loosen the valve lock nut.
  5. Rotate the adjusting screw to the specified clearance.
  6. Hold the screw and tighten the valve lock nut, then recheck clearance.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • Intake 0.10 ~ 0.15 mm
  • Exhaust 0.15 ~ 0.20 mm

Full service-parts list: Cummins/Onan RV Generator Set →

Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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