With production of engines increases, all truck engine makers battle for depressed market share. But as for after sale services, commonly it is more talking rather than actual service, turning the product chain into a big spare part warehouse. And based on this, many truck users think it is right to change parts when something goes wrong, as a result, many problems are caused by changing parts blindly.
Change when change is needed, but repair first.
For example, this was a 2009 HOWO engine, WD615, a month ago, abrasion of crankshaft bearing. Workshop judged easily it was because of over-loading for long term, as a result, 6 connecting rods, crankshaft and bearings were changed.
But, a week later, abrasion occurred again.
From oil holes on crankshaft, we can see wearing evidence.
For WD615 engine, main oil route not only supplies crankshaft, also for camshaft. Oil will first go through oil cooler and filter, then to go different routes.
In this case, the abrasion is caused by impurity inside oil route. In all WD615 engine oil filters, there is a safety valve, once the filter is jammed by impurity, in order to get oil route goes smoothly, the safety valve would open, therefore impurity would go into oil route. This is a time bomb.
As a result, when the engine first went to workshop, only broken parts were changed, nothing else. But the core cure was to change filter, to change oil, and, clean all oil route, then change broken parts.
For trucks working in construction, the timing for change of filters is not determined by travel distance, but working hours. And if there are a lot of steep hills, if possible, add duel oil pump in order to avoid oil route lacking oil pressure.