Test cooling system cap - AR20.30-P-4300HA
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.
Engines 111, 120, 601, 602, 603, 604, 605, 606 /
| Removing/installing | |||
| The cap in model 163 cannot be checked; it must simply be replaced. | |||
| 1 | Open cooling system cap (5, 5a) | Cap with detent: Carefully rotate cap up to the first detent, release overpressure, then unscrew cap. 2-stage cap: Turn cap half a turn in anti-clockwise direction, release overpressure, then unscrew cap. |
|
| Test cap with detent | |||
| 2.1 | Check cap (5) for corrosion | ||
| 3.1 | Attach test cap (3) and double union (4) to tester (2) | Figure | |
| Figure | |||
| Fig 6 | |||
| 4.1 | Screw cap (5) with detent onto the double union (4) | ||
| 5.1 | Inspect pressure relief valve | Determine the opening pressure of cap (5) by pumping; replace cap (5) if necessary. |
*BE20.30-P-1001-01A |
| 6.1 | Test vacuum valve (6) | For a cap (5): The vacuum valve (6) must be resting against the rubber seal (arrow); it must be easy to raise it and must spring back when released. | *BE20.30-P-1003-01A |
| Check 2-stage cap | |||
| 7.1 | Attach test cap (3a) to tester (2) | Figure | |
| Figure | |||
| 8.1 | Screw 2-stage cap (5a) onto test cap (3a) | ||
| 9.1 | Inspect pressure relief valve | Determine the opening pressure of cap (5) by pumping, replace cap (5) if necessary. Function see ↓ |
*BE20.30-P-1004-01A |
| Function of 2-stage cap | GF20.30-P-1000A | ||
| 10 | Install in reverse order |
Cap of radiator or expansion reservoir
| Number | Designation | Cap | 2-stage cap | ||
|---|---|---|---|---|---|
| BE20.30-P-1001-01A | Cap code number | 140 | 140/200 | ||
| BE20.30-P-1002-01A | Pressure relief valve opens | New | bar gage | 1.4 (+0.1) | - |
| Used | bar gage | 1.4 (-0.1) | - | ||
| BE20.30-P-1003-01A | Vacuum valve opens (reference value) | bar vacuum | 0.1 | 0.1 | |
| BE20.30-P-1004-01A | Pressure relief valve opens | 1st stage | bar gage | - | 1.4 (± 1) |
| Coolant temp. | - | ≥ 130/134 | |||
| 2nd stage | bar gage | - | 2.0 (± 1) | ||
| Coolant temp. | - | ≥ 137/143 | |||
| BE20.30-P-1005-01A | Test pressure for pressure-testing cooling system | bar gage | 1.4 | 1.4 | |