Diesel engines, as the “power bearer” in industry and transportation, the proper functioning of their valve assemblies is critical. Once the valve assembly fails, the engine will fall into a “sick state”, with weakened power, soaring fuel consumption and even starting difficulties. Mastery of scientific and effective troubleshooting method, as if holding a diagnosis and treatment prescription, can let the engine quickly “rehabilitation”, back to efficient operation track.

Troubleshooting begins with a keen “listening” is the first step. Start the diesel engine, listen to the running sound. If there is a crisp and rhythmic “da da” sound, similar to the metal tap, it is likely that the valve clearance is too large. Normal operation, the valve and rocker arms, camshafts and other coordination needs to be precise clearance to ensure smooth action, wear, improper adjustment and other factors can easily lead to excessive clearance. At this time, you need to use the plug ruler to measure the valve lash, against the engine manual standard value, if out of range, with the help of a wrench to loosen the adjusting nut, according to the specifications of rotating the adjusting screw, accurate adjustment of the gap, to restore the normal valve “rhythm”.

When the engine running dull, weak feeling, and black smoke from the exhaust pipe, exhaust is not smooth probability is the “culprit”, the root cause may be in the exhaust valve. Carbon buildup is a common cause of disease, long-term operation, incomplete combustion of fuel produces carbon like “stubborn scale”, attached to the exhaust valve seat, valve core, hindering the exhaust gas discharge. Dismantle the exhaust system, take out the exhaust valve, soak with a professional cleaning agent, soft brush to clean up the carbon, and then check the valve surface sealing, minor wear and tear can be ground to repair, serious wear and tear can only update the valve to ensure that the exhaust “channel” smooth and unobstructed, so that the engine “breathing”! freely.