SM07.54-W-0004A | Replace turbocharger and change data record in the engine control (MR) control unit | 16.11.09 |
ENGINES 902.9, 906.9 in MODEL 957 with CODE (MS8) natural gas engine
W07.54-1016-06
1 Electrical line
2 Cable tie
3 Cylinder head cover
4 Cap
5 Turbocharger
6 Intake manifold
Operation no. of operation texts or standard texts and flat rates
Category | Op. no. | Operation text | Time | Acc. no. | Code |
O | 027077 | OPERATIONS: CHANGE DATA RECORD AND SOFTWARE IN MR CONTROL UNIT | 0,7h | 09 930 95 | GAS TURBO |
O | 027078 | OPERATIONS: REPLACE CAP OF ELECTRONIC ACCELERATOR ADJUSTING MOTOR | 0.1 h | 09 930 95 | GAS TURBO |
O | 027079 | OPERATIONS: CHECK INSTALLATION OF LINES OF OXYGEN SENSOR | 0.1 h | 09 930 95 | GAS TURBO |
O | 027080 | OPERATIONS: REPAIR INSTALLATION OF LINES OF OXYGEN SENSOR | 0.1 h | 09 930 95 | GAS TURBO |
O | 027081 | OPERATIONS: CHECK GAS INJECTION VALVES | 0.8 h | 09 930 95 | GAS TURBO |
O | 027082 | OPERATIONS: MODIFY GAS INJECTION VALVE (1) | 0.2 h | 09 930 95 | GAS TURBO |
O | 027083 | OPERATIONS: MODIFY GAS INJECTION VALVE (EACH REMAINING) | 0.2 h | 09 930 95 | GAS TURBO |
O | 027084 | OPERATIONS: REPLACE TURBOCHARGER | 2,5h | 09 930 95 | GAS TURBO |
| Checking | ||
1 | Close gas shutoff valves at compressed-gas tanks | ||
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 engine as it is running | Secure vehicle to prevent it from moving by itself. | |
2 | Start engine and run on idle until the engine goes off by itself | In this way residual gas is used up in the lines and components. | |
3 | Switch off ignition | ||
4 | Remove cylinder head cover (3) | ||
5 | Check part number of gas injection valves | Gas injection valves, which do not have the part number A 906 078 04 49, should be replaced: | |
Replace gas injection valve. | |||
With regard to return shipment or scrapping of removed parts, please observe the information in your warranty system. | |||
6 | Check gas injection valves for firm seating in intake manifold | If loose gas injection valves are detected: | |
Remove corresponding gas injection valve, insert shim in the valve seat and install gas injection valve again. | |||
7 | Install cylinder head cover (3) | Only tilt back the cab after checking the installation of lines of oxygen sensor. | |
8 | Open gas shutoff valves on compressed-gas tanks | ||
9 | Replace cap (4) on electronic accelerator adjusting motor | ||
10 | Replace turbocharger (5) | Only tilt back the cab after checking the installation of lines of oxygen sensor. | |
With regard to return shipment or scrapping of removed parts, please observe the information in your warranty system. | |||
11 | Check routing of electrical line (1) to oxygen sensor | If the installation of lines does not correspond to the figure or the insulation of the electrical line (1) is damaged: | |
Insulate electrical line (1), route over the intake manifold (6) and secure with cable ties (2). | |||
Danger! | Risk of injury caused by body parts being pinched or crushed 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. | |
12 | Lower cab | ||
| Notes on tilting the cab | ||
13 | Close maintenance flap | ||
14 | Connect Star Diagnosis | The download is available as of Star Diagnosis DAS update 11/2009. | |
The following conditions must be met for carrying out the download: - Battery voltage 24 V...26 V. - It is essential that the power supply for the STAR DIAGNOSIS computer remains constant throughout the entire period. | |||
During the download, do not - Start any other application, - Perform on-board diagnosis, - Run or start the engine and - Disconnect the vehicle battery. | |||
15 | Switch on ignition | ||
16 | Start Diagnosis Assistance System (DAS) | ||
17 | Select "Truck" category | ||
18 | Select "Automatic access using model series" | ||
19 | Select "Special functions" | ||
20 | Select "CNG [compressed natural gas] download" | ||
21 | Select the download with the highest number | The download is menu-assisted. Follow all of the instructions given by the Diagnosis Assistance System (DAS). | |
With the display "The control unit already contains the latest control unit software version" the latest version is already installed and the process is complete. | |||
Likewise the process is complete if the display | |||
22 | Disconnect Star Diagnosis |
Parts ordering notes
Part no. | Designation | Quantity |
A 906 078 04 49 | Gas injection valve | As required |
A 126 262 10 52 05 | Washer | As required |
A 000 998 69 21 05 | Cap | 1 |
A 902 096 09 99 05 | Turbocharger | 1 |