AR20.00-W-1010C | Inspecting the cooling system for leaks | 13.12.11 |
ENGINE 457.9 in MODELS 374, 375, 940, 942, 943, 944, 958
W20.00-1014-12
Shown on model 944
1 Coolant expansion reservoir
2 Clamp
3 Adapter
4 Tester
5 Angled piece
6 Knurled nut
Modification notes
14.12.04 | Work procedure completely revised. | ||
1.7.05 | Coolant | Engine 457.9 without code BA1 or BA9 | |
Coolant | Engine 457.9 with code BA1 | ||
Coolant | Engine 457.9 with code BA9 |
| Checking | ||
1 | Open regulating valve of heating system | On vehicles with the standard heater temperature selector wheel in the "max. heat" position, on vehicles with the heater control (HZR) steering wheel lock in position "ignition On". | |
Danger! | Risk of injury caused by being caught or pinched as cab is tilted | Ensure that no one is within the tilting range of the cab as it is being tilted. Always tilt the cab all the way to the end position and secure with the safety strut. | |
2 | Tilt cab | ||
| Notes on tilting the cab | ||
Danger! | Risk of injury to skin and eyes caused by 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. | |
3 | Remove cap on coolant expansion tank (1) | ||
| Notes on coolant | ||
4 | Check coolant level, pour in coolant if necessary | If the antifreeze in the coolant is very less, either add more antifreeze or change the coolant. | |
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Antifreeze tester | |||
5 | Dry rub the coolant filler neck on the inside on the coolant expansion tank (1) | ||
6 | Adapt sealing rubber on adapter (3) by turning at the inside diameter of the coolant filler neck | | |
7 | Screw knurled nut (6) onto adapter (3) | | |
8 | Tighten angular piece (5) and tester (4) on the adapter (3) | | |
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9 | Attach adapter (3) with tester (4) to coolant expansion tank (1) and hook clamp (2) over knurled nut (6) on the adapter (3) | Hook the clamp (2) below the raised bead (arrows) on the coolant filler neck and pretension the clamp (2) using the knurled nut (6). | |
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10 | Apply compressed air to the cooling system at the tester (4) and check cooling system for leaks | Observe test pressure and test period otherwise the cooling system can be damaged. | |
A pressure drop at the pressure gauge of the tester (4) is visible if there is a leak in the cooling system (4). | |||
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11 | Perform visual inspection on all coolant carrying components | Only for pressure drop and visible coolant loss: | |
Check radiator, heater cooler, coolant pump, cooling and heating hose, coolant lines and their connecting points, hose clamps, cylinder head gaskets, core hole cover or core hole plug bolts and possibly remove leaks in the cooling system. | |||
Only for pressure drop and no visible coolant loss: | |||
Check cylinder head and cylinder liner for cracks. | |||
12 | Relieve test pressure at tester (4), remove clamp (2) and adapter (3) using tester (4) on coolant expansion tank (1) | | |
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13 | Check coolant level, pour in coolant if necessary | Only if a pressure drop in the cooling system existed. | |
If the antifreeze in the coolant is very less, either add more antifreeze or change the coolant. | |||
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Antifreeze tester | |||
14 | Tighten cap on coolant expansion tank (1) | ||
Danger! | Risk of injury caused by being caught or pinched as cab is tilted | Ensure that no one is within the tilting range of the cab as it is being tilted. Always tilt the cab all the way to the end position and secure with the safety strut. | |
15 | Lower cab | ||
| Notes on tilting the cab |
Test values for cooling system
Number | Designation | Engine 457.9 | ||
BE20.30-N-1001-01D | Pressure drop in cooling system | Test pressure 1.0 bar/ test period 5 up to | bar | 0 |
Engine cooling system
Number | Designation | Engine | Engine | Engine | ||
BF20.00-N-1001-01B | Coolant | Total capacity | Liters | 33.5 | 37.0 | 40.0 |
Anticorrosion/antifreeze agent down to -37°C | Liters | 17.0 | 18.5 | 20.0 | ||
Anticorrosion/antifreeze down to -45°C | Liters | 18.5 | 20.5 | 22.0 | ||
Specifications for Operating Fluids | Sheet | |||||
Sheet | ||||||
Sheet | ||||||
655 589 00 63 00
Clamp
Adapter
Tester
001 589 83 21 00
950 589 12 63 00
Referenced documents
- ah2000n208001a Notes on coolant
- ah6080n000301a Notes on tilting the cab
- as2000z000101a Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant.
- as6080z000101a Risk of injury caused by body parts being pinched or crushed as cab is tilted