Maintenance requirements for crankcase

Source: Bearing network time: 2017-10-17

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1. Completely clear the crankcase and its internal oil passage; it is necessary to carefully check and ensure that the oil passage inside the crankcase is dredged; the partitions of the box shall not have cracks everywhere; the sealing surface of each equipment shall not be scratched or damaged.
2. Carefully check the crankcase cylinder seat surface; ensure that the seat surface is flat and lubricated, without bumps, scratches or other defects. Check the flatness between the cylinder heads of each cylinder; the total length of the crankcase liner plane The flatness inside shall not be greater than 0.1 mm.
3. If there is slight scratch or strain on the bottom hole of the crankcase main shaft; it can be used after grinding and flattening with precision oil stone or No. 00 sandpaper. Severe scratches, strains or cracks in the diaphragm; Way to fix:
(1) When it is slightly scratched, strained or out of round; it can be disposed of by expanding the hole in the bottom of the main shaft.
(2) If the scratches, scratches and scratches are deep, the partitions of the box are cracked or the bushings are rotated; they can be corrected by thermal spraying.
Attention: It is necessary to use sophisticated, high-tech advanced technology to complete the thermal spraying. After spraying, it is necessary to perform high-precision boring on the bottom hole of the bearing bush to ensure the coaxiality of the bottom hole of the spindle.
4. If there is damage to the main bearing cap; all main bearing caps of the same diesel engine need to be replaced together; it can be modified by high-precision reaming or high-precision boring after thermal spraying.
5. It is necessary to check the position of the main bearing cover equipment; the direction cannot be exchanged. The order of the numbers is: starting from the flywheel end: 1-2-3-4-5-6-7 (to the fan segment)
6. It is necessary to check the coaxiality of the bottom hole of the main shaft and the camshaft hole in the full length, that is, the axis of the adjacent two holes. It is necessary to meet the demand of the Deutz air-cooled diesel engine.
7. If the main bearing cap bolt and cylinder head bolt are strained or cracked, it is necessary to replace it. When the cylinder head bolt extension exceeds the specified value; it is also necessary to replace it.
8. The cylinder head bolt hole and other threaded holes allow the reaming insert to be disposed; however, the reamed thread bottom hole should adhere to the original scale.
9. When the crankcase is covered with a bad seal or loose, the plug should be replaced; and the sealant should be applied.
10. After the crankshaft main shaft wear exceeds the limit; it is necessary to follow the repair level requirements; replace it according to the grinding scale of the crankshaft main journal; ensure the cooperation gap between the crankshaft journal and the main bearing bush meets the specified requirements. :
11. The cooperation gap between the camshaft bushing and the camshaft journal is necessary to meet the extreme requirements; it is necessary to replace the limit scale. It is necessary to pay attention to the oil hole on the bushing and the oil hole on the crankcase.
12. The crankshaft main shaft bush and the camshaft bushing are not overrun; however, there are scratches, etch pits, burnt and other appearances; it is necessary to replace them.
13. There are no scratches, eclipses or other damages on the crankshaft and camshaft bushings. It can be determined by coloring and checking whether it can be used continuously. If the coloring area is small and uneven, it is necessary to repair the crankshaft. .
14. Remove and view the crankcase ventilation equipment; if there is crack, damage or damage; it should be corrected or replaced.
15. Inspect the respirator; if there is damage or damage; it is necessary to correct or replace it. If it is impossible to judge whether the respirator is good or bad; can recognize in the test machine: high-speed idling diesel engine; measure crankcase exhaust pressure; ensure exhaust gas pressure In the range of 2 to 6 mbar; it is necessary to overhaul or replace the respirator when this value is exceeded.
16. Check the diesel engine equipment legs, oil pan, flywheel shell, rear oil seal cover, accessory bracket and other parts; if there are cracks, deformation and damage; replace it.

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