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Atlas Copco QAX 12-20-30 Dd — The engine knocks

For the Atlas Copco QAX 12-20-30 Dd.

Applies to: Atlas Copco QAX 12-20-30 Dd

Procedure

  1. Fault in fuel lift pump.
  2. Fault in atomisers or atomisers of an incorrect type.
  3. Fault in cold start system.
  4. Wrong type or grade of fuel used.
  5. Engine temperature is too high.
  6. Incorrect valve tip clearances.

Source: manual:QAX 12-20-30 Inst 2006 .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.