Bebe4c01101 Fuel Injector Diesel Compatible with Volvo 20440388 for Volvo FM12 Truck Engine

The engine injector is an important part to realize fuel injection in the diesel fuel supply system. The layout structure of the fuel injector of the engine, see the assembly of the fuel injector through the cylinder head and cylinder head cover; fastening through the fixing plate and bolts; the positioning of the fuel injector is divided into upper and lower ends; the lower end is positioned on the cylinder head; the upper end is positioned On the cylinder head cover, it also takes into account the o-ring seal. The installation and positioning of the fuel injector is performed by different upper and lower parts. There is a positioning deviation that causes the cylinder head cover and the cylinder head mounting hole to be out of axis, which in turn causes the installation of the fuel injector to be inclined.

The reason for the cracking of the injector hole in the cylinder head: the upper end of the injector is positioned by the hole in the cylinder head cover, and the lower end is positioned by the hole in the cylinder head.

Positioning belongs to two parts. When the upper and lower positioning holes are misaligned, the injector will interfere with the cylinder head hole wall, resulting in contact stress, and after a long period of operation, fatigue cracks will occur. Therefore, specific improvement measures have been formulated: adjust the assembly and positioning method of the fuel injector, change the positioning to the cylinder head, and cancel the upper positioning of the cylinder head cover.