Cummins/Onan 3.6MKY / 4MKY — Choke Adjustment
Adjustments · Choke assembly
For the Cummins/Onan 3.6MKY / 4MKY, from the Cummins/Onan service manual.
Applies to: Cummins/Onan 3.6MKY, Cummins/Onan 4MKY
Before you start
- The choke housing becomes hot during operation and can cause severe burns if touched
Procedure
- Allow genset to cool down; housing temperature must equal ambient temperature.
- Loosen the adjustment screw holding the adjustment plate.
- Slowly rotate adjustment plate until bimetal choke shaft connection is visible in the sight window (correct at 70 deg F [21 deg C]).
- For other ambient temperatures, make a mark opposite the center mark; each mark equals 10 deg F (6 deg C) difference.
- Rotate plate clockwise if warmer, counterclockwise if cooler than 70 deg F (21 deg C); tighten screw.
- Move choke lever back and forth to check for free movement; verify choke does not bind or stick.
Specs & values
- Correct setting at 70 deg F (21 deg C); each adjustment plate mark equals 10 deg F (6 deg C)
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.