Remove/Install Piston Rings - AR03.10-P-7311MFG
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Engine 139 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 (4). | AR03.10-P-7021MFG | |
| 2 | Measure side clearance of piston rings (1, 2, 3). | AR03.10-P-7311-01MR | |
| Piston ring vertical clearance | *BE03.10-P-1001-05L | ||
| 3 | Remove piston ring (plain compression ring) (1) with piston ring pliers. | Fig 1 | |
| 4 | Remove piston ring (taper-faced ring) (2) with piston ring pliers. | Fig 1 | |
| 5 | Remove piston ring (oil scraper ring) (3) by hand. | ||
| 6 | Clean piston rings (1, 2, 3) and piston ring grooves. | Assembly cleaner | *BR00.45-Z-1028-04A |
| 7 | Check crankcase, crankshaft, pistons (4), and connecting rods for damage and wear. Notes on the assessment of pistons and piston rings |
If there are problems. Replace corresponding component. |
AH03.10-P-0001-04 MM |
| 8 | Measure end gap of piston rings (1, 2, 3). | AR03.10-P-7311-02MR | |
| Piston ring end gap | *BE03.10-P-1002-05L | ||
| Install | |||
| 9 | Install piston ring (oil scraper ring) (3) by hand. | ||
| 10 | Install piston ring (taper-faced ring) (2) with piston ring pliers. | Fig 1 | |
| 11 | Install piston ring (plain compression ring) (3) with piston ring pliers. | Fig 1 | |
| 12 | Offset piston ring end gaps of the piston rings (1, 2, 3) by 120° each around the circumference of the piston (4). | ||
| 13 | Install pistons (4). | AR03.10-P-7021MFG |
CHECK VALUES FOR PISTON RINGS
| Number | Designation | Engine 139 | ||
|---|---|---|---|---|
| BE03.10-P-1001-05L | Piston ring vertical clearance | Groove 1 | mm | 0, 02...0, 065 |
| Groove 2 | mm | 0, 02...0, 06 | ||
| Groove 3 | mm | 0, 03...0, 2 | ||
CHECK VALUES FOR PISTON RINGS
| Number | Designation | Engine 139 | ||
|---|---|---|---|---|
| BE03.10-P-1002-05L | Piston ring end gap | Groove 1 | mm | 0, 18...0, 28 |
| 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 |