Remove/Install Piston Rings - AR03.10-P-7311MFC
WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2023 Mercedes-Benz CLA45 AMG, 2023 Mercedes-Benz CLA35 AMG, 2023 Mercedes-Benz CLA250, 2022 Mercedes-Benz CLA45 AMG, and 2022 Mercedes-Benz CLA35 AMG. However, it is still accessible from the selected car via links, so may be relevant.
Engine 260 in model 118, 177, 247
| Risk of injury caused by scraping or cutting body parts on sharp vehicle parts | Always wear protective gloves when working on or near sharp and non-deburred vehicle parts. Deburr repair panels. |
AS00.00-Z-0017-01A | |
| Risk of injury to skin and eyes due to handling of engine oil. Risk of poisoning caused by swallowing engine oil | Wear protective gloves, protective clothing and safety glasses. Do not fill engine oil into beverage containers. |
AS18.00-Z-0001-01A | |
| Topical note | Notes on avoiding damage through contamination and foreign objects | AH00.00-P-5000-01A | |
| Remove | |||
| 1 | Remove pistons (5). | AR03.10-P-7021MFC | |
| 2 | Measure side clearance of the piston rings (6a, 6b, 6c). | AR03.10-P-7311-01MFC | |
| Piston ring vertical clearance | *BE03.10-P-1001-05L | ||
| 3 | Remove piston ring (plain compression ring) (6c) with piston ring pliers. | Fig 1 | |
| 4 | Remove piston ring (taper-faced hook scraper ring) (6b) with piston ring pliers. | Fig 1 | |
| 5 | Manually remove piston ring (oil scraper ring) (6a). | ||
| 6 | Clean piston rings (6a, 6b, 6c) and piston ring grooves. | Assembly cleaner | *BR00.45-Z-1028-04A |
| 7 | Check crankcase, crankshaft, pistons (5) and connecting rods for damage and wear. | If wear or damage is detected. Replace the affected component. |
|
| 8 | Measure end gap of the piston rings (6a, 6b, 6c). | AR03.10-P-7311-02MFC | |
| Piston ring end gap | *BE03.10-P-1002-05L | ||
| Install | |||
| 9 | Install piston ring (oil scraper ring) (6a) by hand. | ||
| 10 | Install piston ring (taper-faced hook scraper ring) (6b) with piston ring pliers. | Fig 1 | |
| 11 | Install piston ring (plain compression ring) (6c) with piston ring pliers. | Fig 1 | |
| 12 | Offset piston ring end gaps of piston rings (6a, 6b, 6c) by in each case 120° at circumference of piston (5). | ||
| 13 | Install pistons (5). | AR03.10-P-7021MFC |
CHECK VALUES FOR PISTON RINGS
| Number | Designation | Engine 260 | ||
|---|---|---|---|---|
| BE03.10-P-1001-05L | Piston ring vertical clearance | Groove 1 | mm | 0, 03...0, 07 |
| Groove 2 | mm | 0, 02...0, 06 | ||
| Groove 3 | mm | 0, 01...0, 18 | ||
CHECK VALUES FOR PISTON RINGS
| Number | Designation | Engine 260 | ||
|---|---|---|---|---|
| BE03.10-P-1002-05L | Piston ring end gap | Groove 1 | mm | 0, 2...0, 3 |
| Groove 2 | mm | 0, 3...0, 5 | ||
| Groove 3 | mm | 0, 2...0, 7 | ||
REPAIR MATERIALS
| Number | Designation | Order number |
|---|---|---|
| BR00.45-Z-1028-04A | Assembly cleaner | A 000 986 56 01 |