Inspect Cooling System For Leaks - AR20.00-P-1010LW
Engine 177, 264, 274.9, 276.8, 626, 651, 654 in model 205
Engine 264, 274.9, 276.8, 642, 651, 654, 656 in model 253
Shown on engine 276.8
| Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant. | Do not open cooling system unless coolant temperature is below 90 °C. Open cap slowly and release the overpressure. Do not pour coolant into beverage containers. Wear protective gloves, protective clothing and safety glasses. |
AS20.00-Z-0001-01A | |
| Notes on coolant | AH20.00-N-2080-01A | ||
| Notes on coolant level | AH20.00-P-1142-01CW | ||
| Remove | |||
| 1 | Switch on ignition. | ||
| 2 | Adjust heater to maximum heat output. | ||
| 3 | Slowly unscrew cap (1) at coolant expansion reservoir (2) and release overpressure if necessary. | ||
| 4 | Check coolant level and antifreeze content of coolant. | *BF20.00-P-1001-04A | |
| 5 | Screw tester cap (3) onto coolant expansion reservoir (2). | Fig 1 | |
| 6 | Connect pressure pump (4) at tester cap (3). | Fig 2 | |
| Check | |||
| 7 | Apply a test pressure to the engine cooling system for 2 minutes. | Do not exceed the specified test pressure. Damage will occur otherwise to the engine cooling system. |
|
| Engine 264, 274.9, 276.8, 626, 651, 654 in model 205 Engine 264, 274.9, 276.8, 642, 651 in model 253 Test pressure for pressure-testing the engine cooling system |
*BE20.30-P-1005-01A | ||
| Engine 177 in model 205 Test pressure for pressure-testing the cooling system | *BE20.30-P-1002-01D | ||
| 8 | Perform visual check of coolant-carrying component parts and connecting points for condition and coolant loss. | If a pressure loss exists ↓ Replace damaged assembly part. |
|
| Install | |||
| 9 | Drain off overpressure via valve at pressure pump (4). | Fig 2 | |
| 10 | Unscrew pressure pump (4) from tester cap (3). | ||
| 11 | Unscrew tester cap (3) at coolant expansion reservoir (2). | Fig 1 | |
| 12 | Switch off ignition. | ||
| 13 | Check coolant level and antifreeze content of coolant; correct if necessary. | *BF20.00-P-1001-04A | |
| 14 | Screw cap (1) onto coolant expansion reservoir (2). |
COOLING SYSTEM CHECK VALUES
| Number | Designation | Engine 177 | ||
|---|---|---|---|---|
| BE20.30-P-1002-01D | Test pressure for pressure-testing the cooling system | Overpressure | bar | 1, 4 |
RADIATOR OR EXPANSION RESERVOIR CAP
| Number | Designation | 1-stage cover latch | 2-stage latch cover | ||
|---|---|---|---|---|---|
| BE20.30-P-1005-01A | Test pressure for pressure-testing the engine cooling system | Overpressure | bar | 1, 4 | 1, 4 |
COOLANT MIXING RATIO
| Number | Designation | All engines, except engine 178 in model 190.381 | |||
|---|---|---|---|---|---|
| BF20.00-P-1001-04A | Coolant mixing ratio | Antifreeze/water | Up to -25 °C | % | - |
| Up to -37°C | % | 50/50 | |||
| As of -38 °C | % | 55/45 | |||
| Overview and specifications sheet | BB00.40-P-0310-01A | ||||
| References to sheet specification | BB00.40-P-0310ZZ | ||||