Noget jeg fandt i Google groups - mulige årsager, når der kommer hvis eller grå røg fra bussen.
Måske det kan hjælpe nogen?
Jesper
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Actual white,
Water vapour on cold start, very rarely water ingress from head gasket
cracked head , liner etc.
Black or dark grey,
(i) At full load any revs = max pump injection setting too high, excess
fuel start device not resetting. Service pump
(ii) At full load high & medium revs with lower than expected engine noise = pump timing retarded. Re-time pump.
(iii) At full load, low & medium revs with higher than expected engine
noise = pump timing advanced. Re-time pump.
(iv) At full load, high & medium revs & loss of power = injector nozzle
holes blocked. Service injectors.
(v) At full load high revs only = blocked air cleaner or other air inlet
restriction.
(vi) Intermittent puffy with white or bluish tinges & possibly some
knocking = injector nozzle stuck open. Service injectors.
(vii) At full loads & engine runs faster than normal = pump governor
incorrectly set or faulty. Service pump.
(viii) At full loads but high speed less than normal = governor venturi
throat partially blocked in vacuum type, especially if the engine breather is upstream. Clean.
(ix) At most revs & speeds, bluish to whitish when cold & on startup =
nozzle spray hitting cyl head, due to incorrect fitting (NB left over copper
washers between the head & the injector)
(x) At high loads & revs = injector valve lift too high. Service injectors.
(xi) At all speeds & high loads & hard starting = low cyl pressure, rings,
bore, valves etc Hmmm sorry ;-)
(xii) At full load, medium & high revs & lower power = injector pipes bent or crushed. Don't bend or worse "re" bend.
Blue, bluish-grey or greyish-white,
(i) Blue, whitish when cold at high revs light load but reducing & possibly changing to black as the engine warms, with some loss of power = pump timing retarded or advance faulty. Re-time or service pump.
(ii) Blue, whitish when cold but persisting when hot, with knocking =
injector nozzle stuck open. Service injectors.
(iii) Blue at all revs & loads, hot or cold = oil past rings/bore (worn or
sticking) hmmm again.
(iv) Blue when accelerating after a long idle = oil past valve stems &/or
valve stem seals. Head job but don't tell Harry I used such language ;-)
(v) At max revs = over full oil bath air cleaner or turbo seals.
(vi) Light blue at high revs light load with acrid odour = engine running
too cold, thermostat stuck.
