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Replace spark plugs - AP15.10-P-1580CA

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ENGINE 103, 104 from 1.10.93, 111.920 /921 /940 /941 /942 /943 /944 /945 /946 /947 /952 /956 /957 /958 /960 /961 /970 /973 /974 /975 /977 /982 /983, 120 from 1.10.93 

Shown on engine 104 HFM-SFI 

Fig 1: Identifying Ignition Cable Recess, Guide Rail, Cable Recess And Spark Plug - Shown On Engine 104 HFM-SFI
G04715204Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Shown on engine 104 HFM-SFI 

Fig 2: Identifying Ignition Coils - Shown On Engine 104 HFM-SFI
G04715205Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Shown on engine 120.982/983 

Fig 3: Identifying Ignition Coils - Shown On Engine 120.982/983
G04715206Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Shown on engine 120.980/981 

Fig 4: Identifying DIS Cover And Wiring Harness - Shown On Engine 120.980/981
G04715207Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
REMOVING Removal    
DANGER Risk of death  caused by contact with parts conducting high voltages. Do not touch parts which conduct high voltages. Persons who have electronic implants (e.g. pacemakers) must not perform any work on the ignition system. AS15.10-Z-0001-01A 
NOTES Notes on avoiding damage to ignition system Engine 111
with PEC fuel injection and ignition system		 AH15.10-P-0002-01B 
NOTES Notes on avoiding damage to ignition system Engine 104, 111
with HFM-SFI fuel injection and ignition system		 AH15.10-P-0002-01C 
NOTES Notes on avoiding damage to ignition system Engines 104, 111, 112, 113, 119, 120
with ME-SFI fuel injection and ignition system		 AH15.10-P-0002-01D 
NOTES Notes on avoiding damage to ignition system Engines 103, 104, 119
with CFI fuel injection system		 AH15.10-P-0002-01E 
NOTES Notes on avoiding damage to ignition system Engine 104, 119, 120
with LH sequential multiport fuel injection system		 AH15.10-P-0002-01F 
1 Ignition: OFF    
2.1 Loosen the cable duct partially Engine 120.980/981 ra15001201031x
    IMPORTANT The cable duct must be loosened partially in order to replace the spark plug at cylinder 12.  
    Detach partial rubber seal, remove the cover for the DI switching unit (A) and cable harness (B).
Remove the mounting screws (arrows) for the cable duct.
Detach the cable duct and press it towards the front.		  
3.1 Remove ignition coils    
REFER TO TESTING & REPAIR Remove/install ignition coils Engine 111.921/942/ 943/945/946/947/ 970/973/974/975/ 977 AR15.12-P-2003GA
    IMPORTANT Remove ignition coils (T1/1, T1/2) with connected control lines and ignition lines.  
    Engine 104, 111.920/940/941/944/960/961
IMPORTANT Remove ignition coils (T1/1, T1/2, T1/3) with connected control lines and ignition lines.		 AR15.12-P-2003G 
    Engine 120.982/983 AR15.12-P-2003FA 
4 Release and unplug spark plug connector through slight rotation IMPORTANT Use pliers for straight spark plug connectors.  
    SPECIAL TOOL Fig 8
5.1 Check the spark plug connectors on the inside for any secondary spark gaps (discoloration) and the sealing for any damage. Engines 104, 111
NOTES The catalytic converter can get damaged with spark plug connectors having secondary spark gaps.		  
INSPECT Checking     
5.2 Check spark plug connectors, ignition coil connectors and ignition lines for damage, deformation and crack formation Only for engine 111  
    IMPORTANT Replace, if necessary.  
INSTALLING Installation     
6 Blow out spark plug stems and recesses with compressed air    
7 Replace spark plugs IMPORTANT Install only approved spark plugs.  
    TORQUE SPECIFICATION *BA15.10-P-1001-01A 
    SPECIAL TOOL Engine 103 with tapered seat (B) Fig 5
    SPECIAL TOOL Engine 104, 111 with flat seat (C) Fig 6
    SPECIAL TOOL Engine 120 with flat seat (C), cylinder 1 to 5 and 7 to 12 Fig 7
    SPECIAL TOOL Engine 120 with flat seat (C), cylinder 6 Fig 6
8 Connect spark plug connector IMPORTANT Ensure that the ignition cables are installed correctly.  
9.1 Install ignition coils    
REFER TO TESTING & REPAIR Remove/install ignition coils Engine 111.921/942/ 943/945/946/947/970/973/974/975/ 977 AR15.12-P-2003GA
    Engine 104, 111.920/940/941/944/960/961 AR15.12-P-2003G 
    Engine 120.982/983 AR15.12-P-2003FA 
10.1 Assemble and fasten cable duct Engine 120.980/981 ra15001201031x
TORQUE SPECIFICATION SPARK PLUGS

Number Designation Engine 103 Engine 104, 110, 111, 113.940/941/942/943/ 944/948/960/961/962/ 963/964/965/966/967/ 968/969/971/980/981/ 982/984/986/992/993/ 995, 115, 117, 119, 120 Engines 112.910/911/ 912/913/914/ 915/916/917/ 920/921/922/ 923/940/941/ 942/943/944/ 945/946/947/ 949/951/953/ 954/955/960/ 961/970/972/ 973/975/976
BA15.10-P-1001-01A Spark plugs Nm 20 28 28
Fig 5: Identifying Spark Plug Wrench (102 589 01 09 00)
G04715208Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 6: Identifying Spark Plug Wrench (119 589 02 09 00)
G04715209Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 7: Identifying Spark Plug Wrench (120 589 02 09 00)
G04715210Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 8: Identifying Pliers (103 589 00 37 00)
G04715211Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
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