a , have a 1963 Diesel Land-Rover which,
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although it runs well and is reliable, emits quite a lot of blue smoke at low speeds. The vehicle has only been used for light work on the roads and has done about 50,000 miles. It uses very little oil. The injectors were replaced two months ago. The blue smoke is not the usual smoke or white vapour normally emitted on starting from cold, but it persists at low speeds when the engine is hot. At speeds in excess of about 25 mph In top gear, the exhaust is clear.
AThere are two causes of blue smoke from
a diesel engine, if it is not consuming excessive amount of lubricating oil, these being low injection pressures and retarded injection timing.
As the injectors have been replaced recently you should check the spill cut-off on the fuel pump or have this checked because this could be your problem.
It is quite normal for a slight amount of blue smoke to be emitted by vehicles with DPA fuel pumps when running light at low speeds. This is because the advance and retard mechanism causes the injection timing to be late under the circumstances. It is also possible that the engine is not attaining a high enough operating temperature when running light and you should check the coolant thermostat to ensure that it is operative. The operating temperature should ideally be kept at about 180deg F. Could you give me some idea of the cause and a remedy for this trouble?