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4-9-3-2-2-proverka-sostoyaniya-porshnevykh-kolec.html
4.9.3.2.2. Check of a condition of piston rings
Arrangement of piston rings
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1 – piston;
2 – top compression ring;
3 – lower compression ring;
4 – oil scraper ring |
Sign of need of check or replacement of piston rings is the raised consumption of oil (waste), more than 100 g on 100 km of a way. For check piston rings (fig. The arrangement of piston rings) needs to be cleared carefully of a deposit and resinous deposits.
To check a gap on height between a flute and a ring, as shown in the drawing Check of a Gap between piston rings and flutes.
To check a gap in the lock of piston rings a set of probes, having placed a ring in that sleeve in which it worked at distance of 20-30 mm from the lower end face. For the correct installation of a ring it is necessary to advance it in a sleeve a head of the piston used as a mandrel. If when checking comes to light that the gap is insufficient, follows butt surfaces were washed down and if raised – to replace a ring.
Control sizes of piston rings
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Piston rings
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Height, mm
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Face adjusting gap, mm
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| fashion. 331 | fashion. 3317 and 3313 | fashion. 331 | fashion. 3317 and 3313 |
Top
compression | 1,978 – 1,99 | 1,490 – 1,475 | 1,55 – 0,087 | 0,04 – 0,075 |
Lower
compression | 2,478 – 2,49 | 1,99 – 975 | 0,040 – 0,072 | 0,03 – 0,065 |
| Oil scraper | 4,978 – 4,99 | 2,99 – 2,975 | 0,036 – 0,068 | 0,02 – 0,055 |
At repair of the engine it is necessary to establish repair kits of rings, with not chromeplated top compression ring for providing them to more bystry extra earnings with a surface of sleeves.
If wear of sleeves insignificant, it is necessary to use a repair kit of rings of the nominal size. It is possible until the gap in the lock of rings does not exceed 0,75 mm. If the gap is more maximum permissible – to replace sleeve.
If when checking rings comes to light that the gap is insufficient, follows butt surfaces were washed down and if raised – to replace a ring.
For installation in the sleeves of cylinders chiseled under the repair sizes, in spare parts the rings increased by 0,5 and 1,0 mm are delivered.
The piston rings delivered in the spare part
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Designation for engines
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Name
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fashion. 331
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fashion 3317 and 3313
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412-1000101
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3317.1000101
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Set of piston rings on 1 engine of the nominal size
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412-1000101 – BR
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3317.1000101 – 10
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The same, increased by 0,5 mm
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412-1000101 – BP
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3317.1000101 – 20
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The same, increased by 1,0 mm
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