D01.00-1120-06
Shown on engine 272.979
1 Cylinder leakage tester
2 Oil filler cap
3 Cap
| Removing | ||
Danger! | Risk of injury to skin and eyes caused by handling hot or glowing objects. | Wear safety gloves, protective clothing and safety glasses, if necessary. | |
Danger! | Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the engine as it is running | Secure vehicle to prevent it from moving by itself. | |
Danger! | Risk of injury to skin and eyes caused by scalding from contact with hot coolant spray. Risk of poisoning caused by swallowing coolant. | Do not open cooling system unless coolant temperature is below 90°C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers. Wear protective gloves, protective clothing and safety glasses. | |
1 | Warm up engine to normal operating temperature | Coolant temperature 60 to 80°C. Only check cylinder for leaks when the engine is at normal operating temperature. | |
2 | Remove spark plugs | ||
3 | Open cap (3) on expansion reservoir | Turn cap (3) on expansion reservoir anti-clockwise by half a revolution, release overpressure, then unscrew cap on expansion reservoir (3). | |
4 | Remove oil filler cap (2) | ||
| Checking | ||
5 | Position piston of cylinder to be checked at top dead center (OT) | Aid of helper required. The intake and exhaust valves must be closed during this process. This can be checked using the TDC seeking device. The top dead center seeking device is an integral part of the cylinder leakage tester (1). | |
Cylinder leakage tester gotis://A_01_04.0 | |||
Engine 271.951 | |||
Engine 272.979 | |||
6 | Connect cylinder leakage testing unit (1) to cylinder to be checked | Cylinder leakage tester gotis://A_01_04.0 | |
| |||
7 | Apply compressed air to cylinder to be tested | If crankshaft has to be turned further it must be fixed in place using the retaining lock. See | |
Remove/install retaining lock for crankshaft/ring gear | |||
Engine 271.951 | |||
Engine 272.979 | |||
8 | Read off pressure loss at cylinder leakage tester (1) and determine cause if there is increased pressure loss | Cylinder leakage: permissible loss total indication | |
Cylinder leaktightness: permissible losses at valves and cylinder head gasket | |||
Cylinder leaktightness: permissible losses at pistons and piston rings | |||
| Determining pressure loss of cylinders | ||
9 | Relieve compressed air pressure on checked cylinder and detach cylinder leakage tester (1) | ||
10 | Remove retaining lock | Only if retaining lock was installed to fix the crankshaft in place. | |
Engine 271.951 | |||
Engine 272.979 | |||
11 | Repeat checking on the remaining cylinders in the engine | ||
| |||
Cylinder leakage tester gotis://A_01_04.0 | |||
| Install | ||
12 | Close off oil filling cover (2) | ||
13 | Turn open and close cap (3) on expansion reservoir | ||
14 | Install spark plugs |
Cylinder leakage
Number | Designation | All engines | ||
BE01.00-P-1001-02Z | Cylinder leakage: permissible loss total indication | % | 25 | |
BE01.00-P-1002-02Z | Cylinder leaktightness: permissible losses at valves and cylinder head gasket | % | 10 | |
BE01.00-P-1003-02Z | Cylinder leaktightness: permissible losses at pistons and piston rings | % | 20 | |
Threaded adapter
272 589 00 91 00
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