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Home›Repair guides›Cummins/Onan›Time Injection Pump - Flowing the Pump Method

Cummins/Onan DJ30 — Time Injection Pump - Flowing the Pump Method

Adjustments

For the Cummins/Onan DJ30, from the Cummins/Onan service manual.

Applies to: Onan (Onan Division of Studebaker Corporation, Minneapolis, Minnesota) Spec T, Cummins/Onan DJA engine

Before you start

  • Injection pump must be timed on the compression stroke, not the exhaust stroke

Procedure

  1. Install pump with 0.006-inch shims between pump and pad.
  2. Loosen the delivery valve holder to relieve pressure on the spring.
  3. Rotate the flywheel to about 15 degrees before the port closing point.
  4. Blow in the pump inlet and rotate flywheel clockwise until air stops leaving the outlet.
  5. Measure the distance to the PC mark and select shims from the chart.
  6. Install the pump.

Specs & values

  • Port closing 17 degrees BTC

Full service-parts list: Onan (Onan Division of Studebaker Corporation, Minneapolis, Minnesota) Spec T →

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.

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