Core tips: the application and maintenance of the domestic Deutz diesel engine: the use, adjustment, maintenance and the structure and disassembly of the main parts of the F6L912 diesel engine are described in the maintenance instructions. This article is only in the actual maintenance, the instructions are not mentioned in the instructions and the points needed to be emphasized are described as follows.
The use, adjustment, maintenance and the structure and disassembly of the main parts of the F6L912 diesel engine are described in the maintenance instructions. This article is only described in the actual maintenance, without reference to the instructions and several points to be emphasized.
(1) according to the instructions, the oil nozzle of the cooling piston used by the F6L912 air-cooled diesel engine is long, but in the actual process of the disassembly, it is found that the oil cooling nozzle used by the F6L912 type air-cooled diesel engine produced in the North factory is short. Before the machine is assembled, the nozzle should be dredged to ensure that the oil is sprayed onto the piston and the temperature of the piston is reduced, so as to ensure the normal operation of the machine.
(2) because the bearing cap and the main bearing seat of the main body are tightened after tightening according to the tightening requirements of the main bearing bolts, the combined bearing is manufactured. Between the two, the positioning sleeve is used, so the main bearing cover can not be changed at will, and can not be reversed, so as to prevent the gap between the bearing bearing and the shaft diameter, and destroy the formation of the lubricating oil film.
(3) pay attention to check whether the cylinder head "nose beam area" is cracked or not, we should find out the reason in time. It is the dust that does not clean the dust in time, the long time overloads, the oil supply time is not correct, the cooling effect of the fan is not good, or other reasons, so as to avoid the damage of the machine.
(4) cylinder head bolts, connecting rod bolts, balance block bolts and main bearing bolts all belong to important parts. They belong to high strength bolts. When installing, do not install spring gaskets and thrust pads. During the period of overhaul, the cylinder head bolts and tensile deformation should be checked. The original length of the cylinder head bolts is 211 + 0.5mm, and the length to 212.5mm will be available. Can be reused, should be new, tighten the bolt into the six face to use the sleeve hand tightened as far as possible, do not use twelve surfaces, because of its weak strength, easy to slip, connecting rod bolt principle is the best only once.
(5) if the spindle diameter of South Africa is grind, the weight block should be dismantled. When the weight block is dismantled, the number and direction of the weight block should be marked, so that the balance of the crankshaft should be damaged and the balance block bolt should be replaced by the new bolt after the dismantling of the balance block bolt.
(6) when the oil lining spring is installed, the interface should be securely attached, and the opposite ends of the oil ring should be twisted and then lap in place, and the opening of the interface and the oil ring will be placed in the position of 180 angles.
(7) during the process of dismantling, it is found that there is no valve rod sealing ring on the intake and exhaust valve of the engine, which results in the increase of oil loss and the engine blue smoke. In the assembly process, it is necessary to install the oil resistant acrylic rubber rubber gas rod seal ring on the valve tube.
(8) the valve rotation mechanism is installed on the exhaust valve of the F6L912 air cooled engine. The valve rotation mechanism is installed, and the valve is not installed at the installation time. Through this device, the valve is rotated slowly, and a slight friction is produced on the sealing cone. It has a self cleaning effect to prevent the formation of the sediments and reduce the uneven wear. The temperature of the valve head is uniform along the circumference, reducing the possibility of deformation of the valve, and improving the lubrication condition in the valve guide.
(9) the valve spring of F6L912 diesel engine is variable pitch, and one end of the dense ring is placed in the lower part when installation. If it is installed, the trend of vibration increase will increase, and the wear of valve tube will be increased.
(10) there are two marks on the gear pump gear: "." and ":", when the F6L912 engine is installed, the "." mark and the idler "." should be correct.
(11) the clearance between intake and exhaust clearance is inconsistent with other 135 series engines, and the standard clearance is 0.15mm.
(12) the rubber ring of round section is sealed at the upper and lower connecting part of the push rod pipe, the upper part is black or green fluorine rubber or chlororubber ring, and its temperature resistance is -40 C - 260 C, and the lower part uses the pink silicone rubber seal, and its temperature resistance is -20 C+ 150 C. It is necessary to use the lower spring when installing the lower spring. The installation tool of the door, if there is no special tool, can be used in the pipe and compressed spring well in advance with a thin wire of 0.6-- [Phi] 0.8mm, and the pipe and oil seal are properly installed. After fastening the cylinder head, the wire is taken out, and the spring is automatically pressed into the oil seal. The practice has proved that this practice has a good effect.
(13) when the cylinder head bolts are dismantled, two bolts for each cylinder can not be disassembled with the ordinary 17mm sleeve, because the small hole sleeve is large, and the 17mm sleeve can be sold by the market, and the outer circle of the cylinder is around 1mm with a lathe, and the cylinder head can be put into the cylinder head to disassemble the bolt.
(14) the locking bolt for the front part of the crankshaft pulley is left (no note), and no locking piece is required. The dismantling must be made clear in order to avoid the tighter loading and unloading.
(15) when introducing the camshaft, the camshaft failed to point out that the camshaft has only the first axle diameter (close to the end of the positive gear chamber), and the rest of the shaft diameter has no cam bearing because of the storage channel.
(16) when replacing the shaft diameter, Dongfeng Motor can be replaced by bearing 360111, and the effect is good.
(17) when the injector assembly is drawn out, if no special tools can be used as the following tool, the inner thread of the vehicle is matched with the injector thread at one end of the tool, the 610mm * 400mm round steel is welded in the middle, the 610.5mm hole is drilled in the middle of the 650mm * 100mm round steel, then on the 610mm round steel, and finally on the 50mm * 1 at the other end of the 610mm round steel. 0mm's large pad, moving inertia through 650mm round steel.
(18) the method of removing valve tube is not introduced in the instructions. Because there is a ring on the outer circle of the valve tube, the valve tube can be removed from one direction, the cylinder head is turned over when dismantling, and the catheter can be pulled out with the suitable tool. If the direction is mistaken, it can not only make the catheter out, but also may damage the cylinder head.
