Air-cooled diesel engine use and maintenance question and answer
2019-05-21 13:02:48
1. What should you watch out for when using valve springs?
It is dangerous to damage or break the valve spring of the engine. It will cause a vicious damage accident. Therefore, it is necessary to pay attention to the valve spring.
The free height of the design of the valve spring is 591.9mm, and the free height of use is 56mm. If the free height is 56.5mm during normal inspection, use a new spring.
Valve springs have become shorter after being used for a long period of time, which indicates that they have undergone fatigue deformation and continue to be used and prone to breakage and damage accidents. In addition, the spring becomes shorter, the elastic force decreases, the valve closes loosely, and even an accident that the valve hits the piston and causes the mechanical damage is caused. Therefore, maintenance personnel should pay attention to checking the height of the valve spring at a timely manner and replace valve springs of unsatisfactory lengths in time.
2. Why use a special tool to install the piston ring? What should you watch out for when installing a piston with bare hands?
According to the German Deutz company's technical data, the pliers with limit stop should be used when installing the piston to limit the opening limit of the piston ring. If there is no special installation of the pliers, it can be installed by hand. However, the manual installation is more laborious. ,Easy card to hurt the fingers; hand rubbing the piston ring, the size of the opening is not easy to control, the mouth is too large easy to cut off the piston ring, even if the piston is not broken but will also be damaged, ambush the risk of fracture.
Theoretically, when the opening size of the piston is enlarged to 8 times the thickness of the piston ring, the piston ring may break or become open. Therefore, when a special tool is required to install the piston ring with bare hands, the opening degree of the piston ring should also be properly grasped so as not to make the piston ring too large. The open test ring should not be closed before the piston ring is installed. This will also cause the piston to deform or break.
If you can buy a limited piston ring installation pliers, use it to install better.
3. How to use sealant?
Many joint parts of FL921 air-cooled diesel engine do not need gaskets but only sealant seal. Therefore, it is very important to use sealant to ensure that the diesel engine does not leak or leak gas.
The sealants commonly used in current maintenance include SD314 sealant, Loctite 587 silicone sealant, and Loctite Sun brand 6BR silicone sealant.
The valve cover of the FL912 air-cooled diesel engine is sealed with a sealant adhesive pad, while the oil pan, front cover, and back cover are all sealed by applying sealant without paper pad. When gluing, the cone-shaped outlet aperture of the sealant can be sheared appropriately, and the diameter of the micelle extruded from the above portion can be φ4-5mm. If the diameter of the micelle is too large, the sealant is likely to be lost, contaminated and cause waste. If the diameter of the micelle is too small, the seal is not reliable. The orientation of the micelles should block the orifices of the connecting bolts. The diameter of the micelle should be uniform and should not be broken.
Some repairers use the sealant, squeeze the micelles onto the sealing surface, and then use a finger or a stick to flatten the micelles on the sealing surface. This is not correct. Because the extruded micelle shape is maintained, the gap seal can be formed more effectively after the mechanical parts are assembled, and the quality of the seal will be deteriorated if the micelles are smoothed.
4. Why do I need to replace two toothed tapes at the same time?
When two toothed belts are used to drive, it is necessary to keep the two belts balanced in force and smooth in transmission. Therefore, it is required that the two tapes always maintain the same structure, size, and shape. In general, the new toothed belts are mostly two paired packages. The height difference between the two new toothed belts does not exceed 2 mm.
In use, even if one toothed tape is worn or broken, replace it with a new pair of toothed tape at the same time. Otherwise, if the structure or length of the two toothed tapes is different, the load of the other toothed tapes will be aggravated, and the damage of the toothed belts will be accelerated.
5. Why do the push rod tube seals use two color rubber rings?
The upper part of the push rod protective pipe is connected with the cylinder head, and the lower part is connected with the tappet hole of the machine body. Because the cylinder head has a combustion chamber and the temperature is high, a better fluororubber ring or chlorine rubber apron with temperature resistance is adopted. The temperature resistance is -40- +260C. The color of these two types of aprons is black or green. The temperature at the body is lower, so the red silicone rubber apron is used, and its temperature resistance is -20- +150C.
6. Why does the disassembled diesel engine have abnormal sound after assembly?
A disassembled diesel engine was found to be operating after being mounted and rehabilitated. The diesel engine operation was sometimes abnormal and the operation was not stable. After investigation, the order of the cylinder heads and cylinder liners was originally disordered, and they were not installed in the order of the original assembly position. After installation, the gap between the cylinder heads of the pistons (piston top clearance) was not tested. The difference in compression ratio of the cylinder is too large, resulting in unstable work and abnormal noise.
Technical requirements stipulate that the headspace should be 1.0-1.2mm. After the detection and adjustment as required, the above abnormal noise is eliminated. In general, after the diesel engine is disassembled, it is not necessary to detect the piston top clearance if it is still installed in the position sequence of the original cylinders.
It is dangerous to damage or break the valve spring of the engine. It will cause a vicious damage accident. Therefore, it is necessary to pay attention to the valve spring.
The free height of the design of the valve spring is 591.9mm, and the free height of use is 56mm. If the free height is 56.5mm during normal inspection, use a new spring.
Valve springs have become shorter after being used for a long period of time, which indicates that they have undergone fatigue deformation and continue to be used and prone to breakage and damage accidents. In addition, the spring becomes shorter, the elastic force decreases, the valve closes loosely, and even an accident that the valve hits the piston and causes the mechanical damage is caused. Therefore, maintenance personnel should pay attention to checking the height of the valve spring at a timely manner and replace valve springs of unsatisfactory lengths in time.
2. Why use a special tool to install the piston ring? What should you watch out for when installing a piston with bare hands?
According to the German Deutz company's technical data, the pliers with limit stop should be used when installing the piston to limit the opening limit of the piston ring. If there is no special installation of the pliers, it can be installed by hand. However, the manual installation is more laborious. ,Easy card to hurt the fingers; hand rubbing the piston ring, the size of the opening is not easy to control, the mouth is too large easy to cut off the piston ring, even if the piston is not broken but will also be damaged, ambush the risk of fracture.
Theoretically, when the opening size of the piston is enlarged to 8 times the thickness of the piston ring, the piston ring may break or become open. Therefore, when a special tool is required to install the piston ring with bare hands, the opening degree of the piston ring should also be properly grasped so as not to make the piston ring too large. The open test ring should not be closed before the piston ring is installed. This will also cause the piston to deform or break.
If you can buy a limited piston ring installation pliers, use it to install better.
3. How to use sealant?
Many joint parts of FL921 air-cooled diesel engine do not need gaskets but only sealant seal. Therefore, it is very important to use sealant to ensure that the diesel engine does not leak or leak gas.
The sealants commonly used in current maintenance include SD314 sealant, Loctite 587 silicone sealant, and Loctite Sun brand 6BR silicone sealant.
The valve cover of the FL912 air-cooled diesel engine is sealed with a sealant adhesive pad, while the oil pan, front cover, and back cover are all sealed by applying sealant without paper pad. When gluing, the cone-shaped outlet aperture of the sealant can be sheared appropriately, and the diameter of the micelle extruded from the above portion can be φ4-5mm. If the diameter of the micelle is too large, the sealant is likely to be lost, contaminated and cause waste. If the diameter of the micelle is too small, the seal is not reliable. The orientation of the micelles should block the orifices of the connecting bolts. The diameter of the micelle should be uniform and should not be broken.
Some repairers use the sealant, squeeze the micelles onto the sealing surface, and then use a finger or a stick to flatten the micelles on the sealing surface. This is not correct. Because the extruded micelle shape is maintained, the gap seal can be formed more effectively after the mechanical parts are assembled, and the quality of the seal will be deteriorated if the micelles are smoothed.
4. Why do I need to replace two toothed tapes at the same time?
When two toothed belts are used to drive, it is necessary to keep the two belts balanced in force and smooth in transmission. Therefore, it is required that the two tapes always maintain the same structure, size, and shape. In general, the new toothed belts are mostly two paired packages. The height difference between the two new toothed belts does not exceed 2 mm.
In use, even if one toothed tape is worn or broken, replace it with a new pair of toothed tape at the same time. Otherwise, if the structure or length of the two toothed tapes is different, the load of the other toothed tapes will be aggravated, and the damage of the toothed belts will be accelerated.
5. Why do the push rod tube seals use two color rubber rings?
The upper part of the push rod protective pipe is connected with the cylinder head, and the lower part is connected with the tappet hole of the machine body. Because the cylinder head has a combustion chamber and the temperature is high, a better fluororubber ring or chlorine rubber apron with temperature resistance is adopted. The temperature resistance is -40- +260C. The color of these two types of aprons is black or green. The temperature at the body is lower, so the red silicone rubber apron is used, and its temperature resistance is -20- +150C.
6. Why does the disassembled diesel engine have abnormal sound after assembly?
A disassembled diesel engine was found to be operating after being mounted and rehabilitated. The diesel engine operation was sometimes abnormal and the operation was not stable. After investigation, the order of the cylinder heads and cylinder liners was originally disordered, and they were not installed in the order of the original assembly position. After installation, the gap between the cylinder heads of the pistons (piston top clearance) was not tested. The difference in compression ratio of the cylinder is too large, resulting in unstable work and abnormal noise.
Technical requirements stipulate that the headspace should be 1.0-1.2mm. After the detection and adjustment as required, the above abnormal noise is eliminated. In general, after the diesel engine is disassembled, it is not necessary to detect the piston top clearance if it is still installed in the position sequence of the original cylinders.
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