As engine production increases, all truck engine manufacturers are fighting for a share of the sluggish market. But when it comes to after-sales service, it’s often more talk than service, turning the product chain into one big warehouse of spare parts. Based on this, many truck users believe that it is right to replace parts when there is a fault. As a result, many problems are caused by blind replacement of parts.
For example, this is a 2009 Howo engine, WD615, a month ago, crankshaft bearing wear. It was easy to judge that the workshop was overloaded for a long time, which caused changes to the six connecting rods, crankshafts and bearings.
But, a week later, there was another bruise.
Wear marks can be seen in the oil holes in the crankshaft.
For the WD615 engine, the main oil line supplies not only the crankshaft but also the camshaft. The oil first passes through the oil cooler and filter, and then on a different route.
In this case, the wear is caused by impurities inside the oil circuit. There is a relief valve in all WD615 engine oil filters. Once the filter is blocked with impurities, the relief valve is opened to allow the oil passage to be unblocked and the impurities can enter the oil passage. This is a time bomb.
As a result, when the engine first enters the workshop, only the broken parts are replaced and nothing else. But the core treatment is to change the filter, change the oil, clean all the oil lines, and then replace the damaged parts.
For trucks under construction, the time to change the filter is determined not by the distance traveled but by the working hours. If there are many steep slopes, add dual pumps if possible to avoid a lack of oil pressure in the oil line.