Check low-temperature circuit cooling system for leaks - AR09.41-P-1010RKA
ENGINE 276.8 in MODEL 172
ENGINE 276.8 in MODEL 231
Shown on model 231 with engine 276.8
Fig 1: Checking Low-Temperature Circuit Cooling System For Leaks - Shown On Model 231 With Engine 276.8
| Risk of injury to skin and eyes suffering scalding from contact with hot coolant spray. Risk of poisoning from 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. |
AS20.00-Z-0001-01A | |
| Notes on coolant | AH20.00-N-2080-01A | ||
| Remove | |||
| 1 | Switch on ignition | ||
| 2 | Remove upper engine cover | ||
| 3 | Remove lower engine compartment paneling | model 172.4 | AR61.20-P-1105W |
| 4 | Unscrew cap on low-temperature circuit coolant expansion reservoir (1) | ||
| 5 | Check coolant level and antifreeze content of coolant in low-temperature circuit; correct if necessary | *BF20.00-P-1001-02BA | |
| 6 | Screw tester cap (2) onto low-temperature circuit coolant expansion reservoir (1) | Fig 3 | |
| 7 | Connect pressure pump (3) at tester cap (2) | Fig 2 | |
| 8 | Apply compressed air to low-temperature circuit for 2 minutes at the test pressure | Do not exceed the specified test pressure. Damage can occur on the engine cooling system otherwise. Test pressure for pressure-testing the engine cooling system |
*BE20.30-P-1005-01A |
| Check | |||
| 9 | Check all coolant carrying assembly parts and connection for coolant loss | In the event of pressure loss. | |
| Install | |||
| 10 | Actuate pressure relief button (4) on pressure pump (3) and relieve the pressure | Fig 2 | |
| 11 | Detach pressure pump (3) at tester cap (2) | Fig 2 | |
| 12 | Unscrew tester cap (2) at low-temperature circuit coolant expansion reservoir (1) | Fig 3 | |
| 13 | Switch off ignition | ||
| 14 | Check coolant level and antifreeze content of coolant; correct if necessary | *BF20.00-P-1001-02BA | |
| 15 | Mount cap on low-temperature circuit coolant expansion reservoir (1) | ||
| 16 | Install upper engine cover | ||
| 17 | Install lower engine compartment paneling | model 172.4 | AR61.20-P-1105W |
RADIATOR OR EXPANSION RESERVOIR CAP
| Number | Designation | 1-stage cover latch | 2-stage cover latch | ||
|---|---|---|---|---|---|
| BE20.30-P-1005-01A | Test pressure for pressure-testing the engine cooling system | Overpressure | bar | 1, 4 | 1, 4 |
COOLING SYSTEM
| Number | Designation | Engine 276.8 in model 172 | Engine 276 in model 231 | |||
|---|---|---|---|---|---|---|
| BF20.00-P-1001-02BA | Cooling system | Workshop replacement amount | Main circuit | l | ≈ 10, 4 | ≈ 10, 8 |
| Low-temperature circuit | l | ≈ 3, 4 | ≈ 1, 9 | |||
| Antifreeze/water | Down to -37°C | % | 50/50 | 50/50 | ||
| -38°C and below | % | 55/45 | 55/45 | |||
| Specifications for Fluids, sheet | Operating | Coolant (Specification 310.1). See https://bevo.mercedes-benz.com/index.php?language_id=1 | Coolant (Specification 310.1). See https://bevo.mercedes-benz.com/index.php?language_id=1 | |||
| Specifications for Fluids, sheet | Operating | Anticorrosion agent/antifreeze (Specification 325.6). See https://bevo.mercedes-benz.com/index.php?language_id=1 | Anticorrosion/antifreeze agents (Specification 325.0). See https://bevo.mercedes-benz.com/index.php?language_id=1 | |||
| Specifications for Fluids, sheet | Operating | Premixed coolant (Specification 326.6). See https://bevo.mercedes-benz.com/index.php?language_id=1 | Premixed coolant (Specification 326.0). See https://bevo.mercedes-benz.com/index.php?language_id=1 | |||