Diesel engine white smoke under load

To be more specific, the white smoke you see is your diesel fuel, unburne or only partially burned. The commonest reasons for this lie in the fuel system. They range from faulty fuel injectors to retarded fuel injectio n timing, or even low compression.

A diesel engine in good condition should produce no visible smoke from the exhaust, under most operating conditions. A short puff of smoke when an engine is accelerated under load may be acceptable, due to the lag before the turbocharger speed and air flow is able to match the volume of diesel injected into the cylinders. Causes of Diesel Engine Smoke - By Color.

A brand new diesel engine running at full load will experience a little bit of blow-by upon startup. Blow-by is a condition where diesel fuel, air and vapor are pushed past the rings into the crankcase of the engine. Is white smoke a bad thing? This is due to the fact that colder air, which is more dense than warm air, lowers temperatures in engine cylinders at the end of the compression stroke.

That would only apply to older technology diesel engines , but with modern type diesels, no smoke at all should be evident. Black or White Smoke from Diesel Engine. Most diesel cars (if not all) emit a small amount of black exhaust smoke while accelerating. It takes some time for the engine system to develop enough revolutions (RPM) and power to burn the fuel. Diesel engines can emit blue, black or white smoke from their exhaust while running, and each color can indicate a fault with a part or system.

This will cause white smoke , along with the idle issue. This typically occurs due to the engine being too cool to burn the fuel, often resulting from low compression in one cylinder, problems with the fuel injection timing or a defective fuel injector. This is a case where you’ll probably want to call in the diesel pros, but here’s a diagnostic tip: While the engine is smoking, hold your hand over the exhaust outlet for seconds or so. As a general rule, the first cause of a diesel that’s blowing white smoke will be related to the injector pump timing. Diesels rely heavily on high compression and correct injector pump timing to fire the combustion cycle.

Any reduction in the cylinder pressures or fuel delivery will result in an incomplete combustion process. This unburnt diesel contains minor toxins that may sting your eyes. What causes white exhaust smoke , what causes an. WHITE SMOKE occurs when raw diesel comes through the exhaust completely intact and unburned.

Some causes of this include. This might be caused from the engine being too cool to burn the fuel, low compression in cylinder(s), fuel injection timing, defective fuel injector, burnt out glow plugs, clogged air filter or poor quality fuel. It happens after the engine is hot, maybe a sputter here or there, but after a couple hours of more or less consistent driving it becomes more pronounced. On the common rail Cummins, white smoke is more characteristic of an injector problem.

If the exhaust smells almost like bug spray, it is. Problems in this area will cause diesel engine starting problems, uneven running and white smoke when the engine is cold. The compression doesn’t get the fuel hot enough to burn completely when the engine is cold. However, this should not happen at operating temperature. White smoke at start-up can be unburned diesel fuel.

We have run through several tanks of fuel and still she smokes. Troubleshooting Cummins Diesel Engines , Troubleshooting Procedures and Techniques This guide describes some typical engine operating problems, their causes, and some acceptable corrections to those problems.