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Cummins/Onan — Carburetor Disassembly

A Cummins/Onan service procedure — check it applies to your exact model before use.

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Before you start

  • Always perform carburetor repair under cleanest conditions possible
  • Be careful not to damage the teflon coating applied to some throttle shafts

Procedure

  1. 1. If engine is equipped with an automatic choke,
  2. 2. Remove throttle and choke plate retaining screws,
  3. 3. Remove main and idle adjustment screw assem
  4. 4. On downdraft carburetors, remove attaching
  5. 5. Carefully note position of float assembly parts,
  6. 6. Unscrew and remove needle valve seat.

Source: manual:927-0754 Onan CCK-CCKA-CCKB (Spec A-J) Engine Service Manual (03-1986).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.