Cummins/Onan WC4-10S-5 — Carburetor Adjustments
Adjustments · Carburetor (Marvel-Schebler TSX-126)
For the Cummins/Onan WC4-10S-5, from the Cummins/Onan service manual.
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Before you start
- Don't turn the adjusting screws tightly into their seats or damage may result.
Procedure
- Turn idle adjusting screw entirely in (clockwise) then back it out 3/4 turn.
- Start the power unit; after normal operating temperature, adjust throttle stop screw (B) so it clears the stop about 1/3 turn when running without load.
- At about full load and normal temperature, turn power adjusting screw (E) in slowly until frequency drops noticeably.
- Turn screw (E) out one notch at a time until frequency rises to normal and unit runs smoothly.
- Note the screw position then turn it out 1/4 turn further for cold starting.
- For a new carburetor, approximate adjustment of screw (E) is 1-1/4 turns out from closed.
Specs & values
- Screw (E) approximate 1-1/4 turns out from closed
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.