- Before overhauling, clean the outer surface of the fuel pump.
- Clamp the fuel pump in the vice and remove the delivery valve holder.
- Take out the delivery valve.
- Invert the pump, depress the plunger guide and take out the stop ring.
- Take out the plunger guide.
- Remove spring seats, spring and plunger.
- Remove the control sleeve and the control rack.
- Remove the barrel set screw and take the plunger barrel out.
- Clean all the components with kerosene using a soft brush. Never use a steel brush.
- Always handle plunger and plunger barrel as a pair.
- Renew the O rings.
- Insert the plunger barrel and fix it with the set screws.
- Insert the control rack and fix the control sleeve.
- Match the marks on the control rack, control sleeve and plunger. A mismatch of the marks affects the fuel delivery.
- Assemble the spring seat, spring guide and the stop ring.
- Invert the pump and fix the delivery valve.
- If required replace the valve as a unit. Apply molykote and tighten the delivery valve holder.
- After assembling the fuel pump ensure that the control rack moves smoothly.
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