The correct installation method of seven critical parts of diesel engine
First, the installation of cylinder gasket
1, first check whether the cylinder head and body plane is flat or warped. When the unevenness or warpage exceeds the allowable size should be polished repair.
2, and then the cylinder gasket with copper seam face the cylinder head, and check whether each hole on the cylinder gasket corresponds to each hole on the body, and then tighten the cylinder head according to the provisions.
3. Finally check whether there is air leakage. The simple way is to turn the crankshaft and see whether there is bubble in the cooling water tank, or apply a little oil when installing the cylinder pad to see whether there is oil in the cooling water tank.
Two, the installation of cylinder head
1, the cylinder head bolts must be tightened in the correct order and torque.
2, for single cylinder and double cylinder machine diesel engine, generally according to the diagonal order, multi-cylinder machine are from the middle position of the cylinder head, symmetrical alternately to tighten around one by one. Tighten it step by step with a torque wrench in 2 to 3 times.
3, it should be noted that the cast iron cylinder head in the hot car, aluminum alloy cylinder head should be carried out in the cold car.
Connecting rod and piston assembly
1. First install the connecting rod (small head) to the pin hole of the piston with the piston pin.
2. Install the piston ring (gas ring, oil ring) into the ring groove on the piston.
3. Insert the connecting rod and piston assembly from above the cylinder and the big head of the connecting rod downward (the piston upward) into the cylinder.
4, with the installation of the piston ring special clamp (made of thin iron tools), the piston ring will be tightened to (before the ring opening gap adjustment appropriate, adjust the distance between the two openings of the adjacent ring, generally separated from each other 120 degrees) and the cylinder liner diameter is the same, and then gently push into.
5, connecting rod tile is installed on the connecting rod journal, the two fastening bolts, which is to the left side of the body, which is to the right side of the body, there is a direction, can not be mistaken, mistaken, the crankshaft in the body can not rotate 360 degrees.
6. Tighten the two bolts of the connecting rod tile to reach the required torque.
7. Install the cylinder head and adjust the valve clearance.
8. Install the oil pump and the oil sump.
Four, piston ring installation
1. Install the lining ring
First install the liner ring into the piston slot, its opening is not special requirements, can be placed at will.
2. Install the first oil ring
One of the oil rings is installed below the liner ring and the opening of the oil ring can be positioned in any position. But it is not usually chosen above the piston pin hole.
3. Install another oil ring
Install another oil ring on top of the backing ring, the opening of the other oil ring should be 180 degrees from the opening of the first oil ring, and should not overlap.
4. Install the first air ring
Install the first gas ring (carbon ring) with the lettered side up. Its opening should be 90 degrees to the opening of the first oil ring.
5. Install another air ring
When installing another air ring, the side with the word should also be up, and its opening should be 180 degrees to the opening of the first air ring.
6. Installation completed
After installation, check that the openings of each ring are in the correct position. At this point, the installation of the piston ring is complete.
Five, the installation of oil pump
1, put the unit on the foundation of buried anchor bolts, between the base and the foundation, with a pair of wedge cushion with correction.
2. Loosen the coupling shaft and place it on the pump shaft and base respectively with a level instrument. Adjust the wedge pad to correct the level of the unit and properly tighten the anchor bolt to prevent moving.
3, correct the concentricity of the pump shaft and the motor shaft, on the outer circle of the main road of the coupling, the allowable deviation is 0.1 mm, the clearance of the two couplings plane should ensure 2~4 mm, (small pump takes a small value) the clearance should be uniform, the allowance is 0.3 mm.
4. After connecting the pipeline and determining the direction of motor rotation, connect the coupling again and check the concentricity of the shaft again.
5. After the actual test run of the unit for 2-3 hours, make the final check. If there is no bad phenomenon, the installation is considered qualified. Check the temperature and vibration of bearings during trial run.
6, in the installation process, in order to prevent sundries from falling into the machine, all the holes of the unit should be covered.
7, in order to prevent debris in the pipeline into the pump, for the newly installed pipeline, the pump glue should be installed in the filter, its effective section should be greater than the suction tube section 2-3 times.
Six, fuel injector installation
1. Apply a little gasoline to the new O-ring as shown in the figure.
2. Install the injector on the distribution tubing and rotate it continuously to prevent damage to the O-ring, as shown in the figure.
3, put the rubber seal diagram on several seats of each injector of the intake manifold.
4. Install the injector and distribution tubing together on the engine, and tighten the distribution tubing fastening bolts.
5. Rotate the injector by hand to see if it can rotate smoothly. If it cannot be rotated by hand, it indicates that the O-shaped seal diagram is improperly installed. Reinstall it.
6. Install the inlet pipe and return pipe, and install the vacuum hose of the oil pressure regulator.
7. Install the room and connect the wire harness plug of the standby injector.
Seven, camshaft installation
1, the camshaft is cleaned, and coated with oil on the journal, and loaded into the camshaft bearing with the hand end.
2, put the ring (the side with oil groove should face the thrust surface of the camshaft) and thrust bearing (the oil hole must be aligned with the oil hole on the body, the two cylindrical pins on the inner end face of the thrust bearing should be inserted into the ring hole), and then tighten the three fixed screws on the thrust bearing.
3. When the camshaft is rotated by hand after assembly, there should be no stuck phenomenon; Otherwise, it should be reassembled.
4, check the axial clearance of the camshaft. The method is to pry the camshaft forward, and then measure the axial clearance between the inner end face of the gear and the front end face of the thrust bearing, and its value should be in the range of 0.195 ~ 0.645mm. If the measured value does not meet the technical requirements, the thickness of the ring should be adjusted until it meets the requirements.
