AR07.15-W-1630C | Remove/install engine control unit (MR) | 29.3.06 |
ENGINE 457.9 in MODELS 374, 375, 940, 942, 943, 944, 958
W07.15-1422-09
Shown on model 944 with code (BA1) Performance-optimized Voith retarder
1 Connector for engine wiring harness
2 Vehicle wiring harness connector
3 Fuel line (to fuel pump)
8 Fuel line (from fuel tank)
9 Rubber shock absorbers
A6 Engine control (MR) control unit
5 Oil dipstick guide tube
6 Bracket
7 Manual fuel feed pump
4 Fuel heat exchanger
| Remove/install | ||
Danger! | Risk of explosion caused by ignition of flammable products, risk of poisoning caused by inhaling fuel vapors or swallowing fuel as well as risk of injury to skin and eyes exposed to fuel. | No fire, sparks, open flames or smoking. Wear protective clothing when handling fuel. | |
1 | Switch off ignition | ||
Danger! | Risk of injury caused by being caught or pinched as cab is tilted | Ensure that no one is within tilting range of cab as it is being tilted. Always tilt cab all way to end position and secure with safety strut. | |
2 | Tilt cab | Installation: Only tilt cab back after leak test has been conducted | |
| Notes on tilting the cab | ||
3 | Remove soundproofing on frame at upper left | ||
4 | Pull out oil dipstick guide tube (5) with rubber grommet at holder (6) | ||
5 | Remove fuel line (8) from manual fuel feed pump (7) | Press together clamp and pull out fuel line (8). Collect escaping fuel. | |
6 | Remove fuel line (3) at fuel heat exchanger (4) | Collect escaping fuel. | |
Installation: Replace sealing rings. | |||
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7 | Detach connector of vehicle wiring harness (2) at the engine control (MR) control unit (A6) | For this step push the locking element toward top and release the connector of the vehicle wiring harness (2). | |
8 | Detach connector for engine wiring harness (1) on engine control (MR) control unit (A6) | For this step swivel locking clamp toward bottom and release the connector of the engine wiring harness (1). | |
9 | Remove soundproofing at frame below | Only for code (BA1) Performance-optimized Voith retarder. | |
10.1 | Remove engine control (MR) control unit (A6) with rubber dampers (9) and remove downwards | Vehicles with code (BA1) Performance-optimized Voith retarder | |
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10.2 | Remove engine control (MR) control unit (A6) with rubber dampers (9) and remove upwards | Vehicles without code (BA1) Performance-optimized Voith retarder | |
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11 | Remove fuel heat exchanger (4) with manual fuel feed pump (7) at engine control (MR) control unit (A6) | Only if the engine control (MR) control unit (A6) is replaced. | |
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12 | Install in the reverse order | ||
13 | Teach-in transponder key again and also replacement key | Only if the engine control (EC) (A6) control unit was replaced. | |
Danger! | Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the running engine | Secure vehicle to prevent it from moving by itself. | |
14 | Start engine, bleed fuel system and perform engine test run | The fuel system is bled automatically. If the engine fails to start or only runs for a brief period: | |
Bleed fuel system. | |||
15 | Stop engine and check area of engine control (MR) control unit (A6) for leaks | Visual inspection. |
Diesel injection system with unit pumps (MR)
Number | Designation | Engine 457.9 | ||
BA07.15-N-1001-01G | Bolt, fuel heat exchanger to engine control (MR) control unit | Nm | 8 | |
BA07.15-N-1002-01G | Bolt, control unit (MR) to crankcase | Nm | 12 | |
Fuel pipes/hoses