You can build a effectual diagnosing of the many diesel issues by merely ‘reading’ the exhaust smoke (this is generalized recommendation for every kind of diesel engines).
Black smoke suggests that there is an excessive amount of diesel and not enough gas, that the carbon within the fuel doesn’t have enough gas to mix with. this suggests that a part of the fuel remains unburnt and turns into black soot. This black soot is what makes the exhaust look black.
This downside could also be caused by either:
A dirty filter
Faulty gismo pump
Faulty turbocharger / inter-cooler / hoses
Clogged and/or projected plate valves
Clogged or faulty EGR valve.
White smoke means the fuel isn’t burning properly because of a scarcity of warmth within the combustion chamber. This unburnt diesel contains minor toxins that will sting your eyes. This downside could also be caused by:
A clogged filter
Incorrect gismo pump temporal order
Worn engine (low compression)
Water or gasoline contamination of the fuel.
Blue smoke is caused by excess grease among the engine cylinders throughout combustion. This excess oil then gets burnt and emitted as blue smoke. This downside is sometimes caused by either:
A worn-out engine. A worn-out engine is probably going to be coated in muck. it is also probably to be actuation oil and be terribly rattly. typically sellers fastidiously clean the engine to disguise the signs of adulthood.
Worn valve stem seals. this is often a lot of of a tangle with older, non-turbocharged engines. no matter engine sort, worn valve stem seals tend to cause smoke at start-up and at idle. Constant blue smoke on a turbocharged diesel is unlikely to be caused by worn valve stem seals. Instead, the matter is a lot of probably to be:
Leaking turbocharger seals, that area unit permitting oil into the intake and/or exhaust
Excess engine oil within the sump, that is obtaining splashed up into the bores.
The wrong grade of oil (which is just too skinny for this kind of engine). If the oil is just too skinny, a number of it’s going to sneak past the oil management rings and be burnt as a part of the combustion. If the matter is oil that’s too skinny, there’ll most likely be blue smoke the least bit revs, however particularly when a amount of inactivity and conjointly once the engine is at high revs or underneath serious load.
Diesel fuel contaminating the oil. this might be caused by faulty gismo pump and/or pump (which permits engine grease to combine with the diesel).
This downside may additionally be caused by faulty injectors (they’re spurting in an excessive amount of fuel, and also the excess is actuation down the bores into the sump).
It’s also price noting that a lot of trendy diesels suffer from a poorly designed Diesel Particulate Filter system, that deliberately over-fuels the engine for transient periods so as to make enough heat to burn carbon off the Diesel Particulate Filter. If this over-fuelling isn’t unbroken to associate degree absolute minimum, it will work disturbance with the engine.
Again, if the oil has been weakened by contamination with diesel, a number of it’s going to sneak past the oil management rings and be burnt as a part of the combustion. during this case, there’ll most likely be blue smoke the least bit revs, however particularly when a amount of inactivity and conjointly once the engine is at high revs or underneath serious load.
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