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Cummins/Onan — Service Procedure

For these Cummins/Onan models: 3.6MKY, 4MKY.

Applies to: Cummins Onan 3 6Mky, Cummins Onan 4Mky

Before you start

  • For access to the air preheat door, re-
  • The brushes will be damaged
  • Careless handling of rotor or

Procedure

  1. First drain the engine oil and then remove the
  2. Remove the cover from the genset. (Remove
  3. Remove
  4. Remove the engine/generator-to-base mount-
  5. Disconnect all leads from the start relay and re-
  6. Carefully lift the generator end of the genset
  7. Remove the fan housing assembly from the
  8. Secure the fan so that it cannot rotate and re-
  9. Use a magnet to pull out the fan-to-shaft align-
  10. Disconnect the wire harness leads from the
  11. Disconnect the starter bracket from the rear of
  12. Pull outward on the r
  13. Wear gloves to protect hands from sharp

Tools required

  • the wheel puller to the fan hub with three
  • ment key and save it for reassembly. Remove
  • the fan with a wheel puller (Figure 7-2) Attach

Specs & torque values

  • 7-7/8 inches (200 mm) long by 0.45 inches
  • hole (Figure 7-4). Thread a 9/16-12 x 1 inch
  • (11 mm) in diameter into the rotor through bolt

Source: manual:981-0531 Onan MKY Spec J Pontoon Service Manual (8-1999).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.