A Brief Introduction To The Prewarming, Run-in And Operation Of The WD305 Series Diesel Engine

- Nov 18, 2017-

A. Prewarming for the engine

After the engine has started, it takes some time to form oil layer between crankshaft and bearing, pistons and cylinder jackets. Perfect clearance between motion parts can be gained when all the parts reach their normal working temperature. Therefore, as the heating of the engine, increase the speed from650r/min to 1000-1200r/min to warm the engine up. The engine is allowed to operate at full load only when its outlet water temperature exceeds 55℃, oil temperature over 45℃.


B. Run-in for the engine

For a new engine or an engine after overhaul, the engine must run in for 60 hours before it can be put into full load operation. Otherwise, it may greatly affect the use and lifetime of the engine.


Note: 1.In run-in period, pay attention to the exhaustsmoke, sounds and heat condition. Settle abnormal situation immediately.

      2.In run-in period, pay attention to the oil pressure, oil temperature and exhaust cooling water temperature which should be accordance with the instructions.

      3.Inspect readings of the meter frequently.

      4.Renew the lubricating oil after run-in period.


C. Operation for the engine

It is not allowed to operate the engine at 50% of rated power output for a long time, as it can cause high fuel consumption, valve jammed etc. If the temperature of cooling water becomes too low, the unburned fuel may thin the oil in the oil sump, and affect lubricating efficiency.

Any failures occur to parts, such as a sudden surge of oil temperature, a sudden decline of oil pressure and abnormal sounds. Please stop the engine immediately, check and repair it.

Before stopping the engine, run it at idling speed for 3-5 minutes, let cooling water and lubricating oil take the heat away in the engine, which is very important for turbocharged engine. Unless it is in urgent need, the engine shouldn’t be stopped suddenly; otherwise, the turbochargers will overheat and cause their bearings to seize up.

The operator should pay attention to the sounds of turbochargers to see whether any impeller knocks at the housing at the moment that the engine is stopped. If a noise of knocking is heard, please dismantle the turbocharger immediately to check the bearing clearance.Under very cold situation, exhaust all the cooling water in the engine and its accessories to protect the engine from freezing.

The intake and exhaust manifolds of the turbocharged engine must be free of leakage; otherwise, its performance would be lower. Check the tightness of the connecting nuts or bolts and the hose clamps frequently. If necessary, renew the sealing gasket.

When customers are to select proper engine, consideration should be given to reasonable power of working machinery, as the engine shouldn’t be operated at an excessive load or very low load for a long time. Otherwise,


D. The output power for the engine

WD305 series engine outputs its power by flywheel and SAE connector which is used to drive working machinery. Belt pulley can’t be fixed to the flywheel directly, and the machine can’t be dragged in lateral direction, because they can damage the engine’s crankshaft and main bearings easily.

The maximum output power of the engine’s front extension shaft should be within 50kw, but some applications include bearings and clutch etc must be fixed to support the shaft. The power it can bear to be dragged in lateral direction must be controlled within 11kw to protect the main crankshaft and driving gears. For those engines with a fan, dragged in lateral direction is forbidden.

The engine shouldn’t be started with load, therefore, a engaging and disengaging device should be fixed between the engine and those load devices can’t be operated without load, and operator should start the engine when the clutch is released.