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Home›Repair guides›Air Compressor Inlet Valve and Unloading Piston Procedure

Detroit Diesel — Air Compressor Inlet Valve and Unloading Piston Procedure

A Detroit Diesel service procedure — check it applies to your exact model before use.

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Procedure

  1. Direct air pressure from Drive Hub reservoir through governor into cavity below unloading pistons in compressor cylinder block
  2. Air pressure lifts unloading pistons which in turn lifts inlet valves off their seats
  3. With inlet valves held off seats, air during each upstroke of piston is passed back through air inlet cavity to other cylinder where piston is on downstroke
  4. When air pressure in reservoir drops to minimum setting, check pressure relief valve operation

Source: manual:149-workshop-manual-sect-8-15.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.