Testing cylinders for leaks - RA01001190150X(01-0150)
WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.
Operation no. of operation texts and work units or standard texts and flat rates
| Engine | warm up to operating temperature. |
| Ground cable at battery | disconnect, connect. |
| Spark plugs | remove, install (15-1031) . |
| Cap on coolant expansion reservoir | open, close. |
| Coolant level | adjust to correct level (20-0100) . |
| Oil filler cap | open, close. |
| Cylinder leak tester | connect to compressed air system. |
| Tester | calibrate. |
| Connection hose | screw in to first spark plug hole, remove. |
| Piston of cylinder to be tested | position with adjuster by turning crankshaft to ignition TDC. |
| Piston in ignition TDC | see table. |
| Connection hose of tester | connect, disconnect. |
| Compression chamber | pressurize. |
| Throttle valve | open by hand. |
| Pressure loss on tester in % | read off. |
| Pressure | determine whether leak through intake manifold, exhaust, oil filler opening, spark plug hole of adjacent cylinder or coolant filler opening (at reservoir). |
| All cylinders | test in firing order (1-5-4-8-6-3-7-2). |
DATA
| Total pressure loss | max. 25 % |
| At valves and cylinder head gasket | max. 10 % |
| At pistons and piston rings | max. 20 % |
| Marking index | Piston in TDC |
|---|---|
| 0 | 1 and 6 |
| 90 | 5 and 3 |
| 180 | 4 and 7 |
| 270 | 8 and 2 |
COMMERCIALLY AVAILABLE TOOL
| Cylinder leak tester | e.g. | Bosch, EFAW 210A Sun, CLT 228 |