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Home›Repair guides›Perkins›To check the timing of the fuel injection pump

Perkins — To check the timing of the fuel injection pump

Adjustments

From a Perkins service manual covering: 403C-11, 403C-15, 404C-22. Check it applies to your exact model before use.

Applies to: Perkins 403C-11, Perkins 403C-15, Perkins 404C-22

Before you start

  • The maximum no load speed must be set by an approved Perkins distributor.

Procedure

  1. Set the piston for number one cylinder to TDC on the compression stroke. Turn the crankshaft counter clockwise a quarter of a revolution.
  2. Remove the ESOS, high pressure fuel pipes and low pressure fuel pipes from the fuel injection pump.
  3. Ensure that the fuel pump rack is in the maximum fuel position.
  4. Remove the delivery valve holder for number 1 cylinder and remove the delivery valve; store in clean fuel until assembly.
  5. Connect the fuel pump spill pipe to the delivery valve holder for number 1 cylinder.
  6. Connect a clean fuel reservoir (approx. 0.2 litres clean fuel) to the fuel injection pump inlet.
  7. Put a waste fuel container below the pipe neck and open the tap.
  8. Turn the crankshaft slowly until the fuel flow reduces to a drop which falls every 7 - 10 seconds; this is the timing point.
  9. Use the value shown by the timing mark with the injection timing tables.
  10. If the engine timing is incorrect adjust the thickness of the fuel injection pump shim.
  11. Fit the delivery valve and tighten the delivery valve holder.
  12. The engine must be tested on an engine test brake to check the maximum no load speed and engine settings after assembly.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • Changing the fuel injection pump shim by 0.1 mm will change the timing by approximately one degree. Thicker shims will retard the timing and thinner shims will advance the timing.
  • Delivery valve holder torque 42 Nm

Full service-parts list: Perkins 403C-11 →, Perkins 403C-15 →, Perkins 404C-22 →

Source: Perkins 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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