The Super Dexta’s three-cylinder diesel is fed by a CAV distributor-type injection pump — one rotor serving all three cylinders, rather than a separate element per cylinder as on an in-line pump. It is a neat, compact unit and, when it is right, an extremely long-lived one.
It is also the one component on this machine that will not be rebuilt at home. A distributor pump needs a calibrated test bench to set delivery and timing, and that is a job for a diesel fuel injection specialist.
Plan
- Record the pump’s identification plate before removal — the setting code matters more than the casting number.
- Blank every port and bag the pump for transport.
- Send pump and injectors out together, so the whole fuel side comes back matched.
- Refit and time to the engine’s marks, then bleed through in order.
Notes
The injectors are worth doing at the same time even if the engine runs. Pop pressure and spray pattern drift slowly, and a set that is merely tired will make a freshly overhauled pump look bad.
Related: super-dexta-fuel-lift-pump.