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Home >> Mercedes Benz >> 1995 >> E420 >> Repair and Diagnosis >> External Pages >> Different car >> Section 11 (Air Compressor, Belt Drives - 140 Chassis) >> Maintenance >> Check condition of poly V-belt - AP13.22-P-1351 >> Poly V-belts - Check condition All engines (single-belt drive) - wh1351pkw0000x(1351)

Poly V-belts - Check condition All engines (single-belt drive) - wh1351pkw0000x(1351)

WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.

Models 107 from 8/85, 124, 126 from 9/85, 129, 140 to 6/93, 201 from 1/85

Fig 1: Locating Poly-V-Belts (Single-Belt Drive)
G05438509Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fuel supply interrupt (item 1).
 
NOTE: Switch off ignition. Do not crank engine with ignition/starter switch (except model 140).
Recording-type compression tester Engine connect (item 2).
crank with compression tester 001 589 76 21 00 and adapter cable 124 589 36 63 00, on model 140 with ignition starter switch.

IMPORTANTModels 129, 140 and engine 119 in model 124  It is necessary to disconnect the plug connectors to turn the crankshaft.

Faults resulting from this procedure, which are stored, must be read out and deleted on the following control units: 

Poly V-belts mark with chalk at easily visible point (arrow).
  Turn engine increment for increment and check belt for damage (see item 3 for damage patterns).
 
NOTE: Replace poly V-belt if damaged as indicated by one of the damage patterns.
Diesel engines   
Tensioning device check condition (item 4).

IMPORTANT Observe different versions.

Special tools 

Fig 2: Identifying Special Tools (001 589 76 21 00 01)
G05438510Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 3: Identifying Special Tools (124 589 36 63 00 01)
G05438511Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Notes for gasoline engines with EZL ignition system 

IMPORTANT Due to the high ignition voltage it is extremely dangerous to touch the ignition system components (ignition coil, spark cables, spark plug connectors, connection socket) when

Fig 4: Identifying Caution Label
G05438512Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

1 Interrupt fuel supply Models 124, 126, 201 except model 124 with engines 104, 111, 119 

Disconnect fuel pump relay (N16/4) before cranking engine.

Illustrated on model 201

Model 124 with engine 111 

Fig 5: Identifying Fuel Pump Relay - Illustrated On Model 201
G05438513Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Disconnect plug connection (arrow) for crankshaft position sensor on PMS control unit (N3/6).

Engine 111.940 with PMS gasoline injection and ignition system.

Fig 6: Identifying PMS Control Unit - Engine 111.940 With PMS Gasoline Injection And Ignition System
G05438514Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Disconnect plug connection (arrow) on HFM control unit (N3/4).

Fig 7: Identifying Plug Connection And HFM Control Unit - Engine 111.960
G05438515Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Engine 111.960 with HFM gasoline injection and ignition system.

Model 124 with engine 119 

Remove cover on accessories compartment. Disconnect plug connection (X26/17) for engine wiring harness on right side in driving direction.

Fig 8: Disconnecting Plug Connection - Model 124 With Engine 119
G05438516Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Model 124 and model 129 with engine 104 

Remove cover on accessories compartment. Remove engine systems control unit (N16), for this purpose turn lever counterclockwise from position "1" to position "0" and pull up.

Fig 9: Identifying Engine Systems Control Unit - Model 124
G05438517Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Model 124

Fig 10: Removing Engine Systems Control Unit - Model 129
G05438518Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Model 129

Model 140 

Disconnect plug connection (X26/17) for engine wiring harness on right side in driving direction.

Fig 11: Identifying Plug Connection - Model 140
G05438519Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Switch off ignition.

Disconnect crankshaft position sensor (L5) (green or black cable) on control unit.

Fig 12: Identifying Crankshaft Position Sensor - Models 124 And 201 With Transistorized Ignition Control Unit
G05438520Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Models 124 and 201 with transistorized ignition control unit

Models 124, 126, 129 and 201 with EZL ignition control unit

Fig 13: Identifying Crankshaft Position Sensor - Models 124, 126, 129 And 201 With EZL Ignition Control Unit
G05438521Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

IMPORTANT On model 140 with engine 120 the plug (L5) must be disconnected on both ignition control units.

Fig 14: Identifying Crankshaft Position Sensor - Models 140
G05438522Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Model 140

Diesel engines 

While starting press shut-off lever (arrow) to prevent engine from starting.

Fig 15: Locating Shut-Off Lever
G05438523Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

2 Connect recording-type compression tester 

Connect compression tester to battery positive (terminal 30) and to plug (terminal 50) of plug connection (X 27).

For this purpose connect adapter cable 124 589 36 63 00 (01) to compression tester lead (02).

Model 124, firewall, driving direction left

Fig 16: Identifying Plug Connection, Adapter Cable And Compression Tester Lead - Model 124, Firewall, Driving Direction Left
G05438524Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Model 126, firewall, driving direction left

Fig 17: Identifying Plug Connection, Adapter Cable And Compression Tester Lead - Model 126, Firewall, Driving Direction Left
G05438525Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Model 201, firewall, driving direction left

Fig 18: Identifying Plug Connection, Adapter Cable And Compression Tester Lead - Model 201, Firewall, Driving Direction Left
G05438526Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Model 124 with engine 119 

Remove cover on accessories compartment. Disconnect plug connection, starter harness (X27) and attach adapter lead (01) 124 589 36 63 00 to prevent fuel from being injected. Connect adapter lead (01) with lead (02) on recording type compression tester.

Remove cover on terminal block (X4/10) and connect terminal (B) on recording type compression tester to terminal block (X4/10).

Fig 19: Identifying Adapter Lead, Terminal Block, Terminal And Starter Harness - Model 124 With Engine 119
G05438527Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Model 129 

Remove right cover (accessories compartment). Disconnect plug (S) from plug connection (X27). Connect crocodile clip (A) from recording type compression tester to plug (S) pin 1 (terminal 50).

Fig 20: Identifying Plug, Plug Connection And Crocodile Clip - Model 129
G05438528Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Open cover on terminal block (X4/10).

Connect crocodile clip (B) to terminal block (X4/10) (terminal 30).

Fig 21: Identifying Terminal Block And Crocodile Clip
G05438529Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

3 Damage patterns 

Fig 22: Identifying Damage Patterns Belts
G05438530Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

4 Check condition of tensioning device 

Diesel engines 

Visually check following parts on tensioning lever mount (1st version up to 10/85):

Bearing bolt (30) of tensioning lever (360).

The collar of the bearing bolt (30) should be in contact with the timing case cover (28).

The tensioning pulley must be aligned correctly.

Tensioning device with bearing bushing.

The bearing bushings are worn out when play can be felt between the bearing bolt (30) and tensioning lever (360).

Fig 23: Identifying Bearing Bolt, Timing Case Cover And Tensioning Lever
G05438531Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
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