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Home >> Mercedes Benz >> 2008 >> R320 >> Repair and Diagnosis >> Suspension >> Wheel Alignment >> Wheels, Chassis Alignment Check - 251 Chassis >> Testing & Repair >> Check vehicle at front and rear axle with electronic inclinometer, adjust if necessary - AR40.20-P-0301RT

Check vehicle at front and rear axle with electronic inclinometer, adjust if necessary - AR40.20-P-0301RT

Model 251 

MODIFICATION NOTES

5.7.13 Vehicle level - rear axle   BE40.20-P-1001-03N
5.7.13 Permissible difference in vehicle level at rear axle between right and left sides of vehicle   BE40.20-P-1002-03N
4.8.15 Method adapted. Operation step 15.1  
Fig 1: Identifying Electronic Inclinometer And Sensor
G10120942Courtesy of MERCEDES-BENZ USA
Fig 2: Checking Sensor
G10120943Courtesy of MERCEDES-BENZ USA

Shown here is measuring point 1 (front left) 

Fig 3: Checking Sensor On Rear Axle Shaft
G10120944Courtesy of MERCEDES-BENZ USA

Shown here is measuring point 3 (rear left) 

INSPECT Check     
1 Drive vehicle onto measurement platform and apply parking brake    
2 Carry out preconditions and tests for vehicle level measurement   AR40.00-P-0202RT 
CLEAN Clean     
3 Clean mounting points for measurement sensor (2) on left and right transverse control arms (1) of front axle    
4 Clean left and right rear axle shafts (3)    
HIGH PRESSURE TEST Measure using pointer device     
5 Position measurement sensor (086a) with measurement feet onto three application points for measurement sensor (2) at measuring point 1 (front left)    
REFER TO SPECIAL TOOLS 000 588 05 19 00 Inclinometer   WS40.00-P-0007B 
    NOTES
Connecting cable on measurement sensor (086a) must face towards vehicle center (arrow).
Otherwise, the measurement will be inaccurate.		  
6 Measure vehicle level using inclinometer (086) at measuring point 1 (front left) and store measured value    
REFER TO SPECIAL TOOLS 000 588 05 19 00 Inclinometer   WS40.00-P-0007B 
    Vehicle level - front axle *BE40.20-P-1001-02N 
7 Repeat operation steps 5 and 6 at measuring point 2 (front right)    
REFER TO SPECIAL TOOLS 000 588 05 19 00 Inclinometer   WS40.00-P-0007B 
    Vehicle level - front axle *BE40.20-P-1001-02N 
8 Position measurement sensor (086a) on left rear axle shaft (3)    
REFER TO SPECIAL TOOLS 000 588 05 19 00 Inclinometer   WS40.00-P-0007B 
    NOTES
Connecting cable on measurement sensor (086a) must face towards vehicle center (arrow).
Otherwise, the measurement will be inaccurate.		  
9 Measure vehicle level on rear axle using inclination of rear axle shaft (3) and store measurement value    
REFER TO SPECIAL TOOLS 000 588 05 19 00 Inclinometer   WS40.00-P-0007B 
    Ride height rear axle *BE40.20-P-1001-03N 
10 Repeat steps 8 and 9 at right rear axle shaft (3)
 		    
REFER TO SPECIAL TOOLS 000 588 05 19 00 inclinometer   WS40.00-P-0007B 
    Vehicle level - rear axle *BE40.20-P-1001-03N 
INSPECT Check     
11 Check maximum permissible difference in vehicle level between left and right side of vehicle IMPORTANT The specified test tolerance applies only when checking the vehicle level but not for calibration.  
Permissible difference in vehicle level at rear axle between right and left side of vehicle *BE40.20-P-1002-03N 
Permissible difference in vehicle level between right and left side of vehicle *BE40.20-P-1002-02N 
12 Transfer the measurements from the inclinometer (086) into the wheel alignment system IMPORTANT Only when performing wheel alignment.  
  Adjust     
13 Remove front axle spring If adjustment operations on the front axle are required.  
Model 251
except code 489 (AIRMATIC)		 AR32.20-P-0200RT
14 Remove rear axle spring If adjustment operations on the rear axle are required.  
Model 251
 
except code 489 (AIRMATIC)		 AR32.20-P-0230GZ
15.1 Adjust vehicle level Model 251
except code 489 (AIRMATIC)
If adjustment operations are required.		  
  AR40.20-P-0301-02GQ
Vehicle level - rear axle *BE40.20-P-1001-03N 
Vehicle level - front axle *BE40.20-P-1001-02N 
Vehicle level adaptation *BE40.20-P-1001-11C 
Vehicle level adaptation *BE40.20-P-1001-12B 
Permissible difference in vehicle level between right and left side of vehicle *BE40.20-P-1002-02N 
Permissible difference in vehicle level at rear axle between right and left side of vehicle *BE40.20-P-1002-03N 
15.2 Calibrate vehicle level using diagnostic system Model 251
with code 489 (AIRMATIC)
If adjustment operations are required.		  
REFER TO SELF-DIAGNOSTIC SYSTEMS     AD00.00-P-2000-04A
Vehicle level - rear axle *BE40.20-P-1001-03N 
Vehicle level - front axle
If the vehicle level is not OK after calibration.
↓
Check level sensor and mounting of level sensor.		 *BE40.20-P-1001-02N 
HIGH PRESSURE TEST Measure using pointer device     
16 Remeasure vehicle level and adjust if necessary Only if the vehicle level was adjusted.  
  Concluding tasks     
17 Adjust the zero position of the xenon headlamps Model 251
with Code 614 (Bi-Xenon headlamps)
Type
with code 615 (Bi-xenon headlamps with active light function)
Model 251
with code 616 (Bi-xenon headlamp unit with integrated asymmetric curve illumination)
Model 251
with code 618 (Bi-xenon headlamps) Only when vehicle level is to be adjusted.		  
REFER TO SELF-DIAGNOSTIC SYSTEMS     AD00.00-P-2000-04A
18 Check headlamp adjustment and correct if necessary Only if the vehicle level was adjusted.  
REFER TO MAINTENANCE     AP82.10-P-8260RT
TEST AND ADJUSTMENT VALUES FOR VEHICLE LEVEL AT FRONT AXLE

Number Designation Model 251 ECE+USA with front+rear steel suspension, except code 847 Model 251 ECE+USA with front+rear steel suspension, with Code 847
BE40.20-P-1001-02N Vehicle level - front axle ∠° +2, 97° (±1, 3°) +3, 35° (±1, 3°)
TEST AND ADJUSTMENT VALUES FOR VEHICLE LEVEL AT FRONT AXLE

Number Designation Model 251 ECE with front steel suspension and rear air suspension Model 251 USA with front steel suspension and rear air suspension
BE40.20-P-1001-02N Vehicle level - front axle ∠° +3, 98° (±1, 3°) +5, 37° (±1, 3°)
TEST AND ADJUSTMENT VALUES FOR VEHICLE LEVEL AT FRONT AXLE

Number Designation Model 251 with air suspension Model 251 AMG
BE40.20-P-1001-02N Vehicle level - front axle ∠° +1, 07° (±1, 3°) +0, 69° (±1, 3°)
TEST AND ADJUSTMENT VALUES FOR VEHICLE LEVEL AT REAR AXLE

Number Designation Model 251 ECE+USA with front+rear steel suspension, except code 847 Model 251 ECE+USA with front+rear steel suspension, with Code 847
BE40.20-P-1001-03N Vehicle level - rear axle ∠° -1, 94° (±0, 9°) -1, 94° (±0, 9°)
TEST AND ADJUSTMENT VALUES FOR VEHICLE LEVEL AT REAR AXLE

Number Designation Model 251 ECE
with front steel suspension and rear air suspension		 Model 251 USA with front steel suspension and rear air suspension
BE40.20-P-1001-03N Vehicle level - rear axle ∠° -3, 81° (±0, 9°) -3, 81° (±0, 9°)
TEST AND ADJUSTMENT VALUES FOR VEHICLE LEVEL AT REAR AXLE

Number Designation Model 251 with air suspension Model 251 AMG
BE40.20-P-1001-03N Vehicle level - rear axle ∠° -4, 19° (±0, 9°) -4, 47° (±0, 9°)
FRONT AXLE ALIGNMENT

Number Designation Model 251
BE40.20-P-1001-11C Vehicle level adaptation Shim 1 Thickness mm 1, 50
Adaptation (height) mm 2, 46
Adaptation (Romess) ∠° 0, 31
Shim 2 Thickness mm 2, 00
Adaptation (height) mm 3, 28
Adaptation (Romess) ∠° 0, 42
Shim 3 Thickness mm 5, 00
Adaptation height mm 8, 20
Adaptation (Romess) ∠° 1, 04
Shim 4 Thickness mm 10, 00
Adaptation (height) mm 16, 40
Adaptation (Romess) ∠° 2, 08
REAR AXLE ALIGNMENT

Number Designation Model 251
BE40.20-P-1001-12B Vehicle level adaptation Shim 1 Thickness mm 1, 50
Adaptation (height) mm 2, 73
Adaptation (Romess) ∠° 0, 26
Shim 2 Thickness mm 2, 00
Adaptation (height) mm 3, 64
Adaptation (Romess) ∠° 0, 34
Shim 3 Thickness mm 5, 00
Adaptation (height) mm 9, 10
Adaptation (Romess) ∠° 0, 85
Shim 4 Thickness mm 10, 00
Adaptation (height) mm 18, 20
Adaptation (Romess) ∠° 1, 70
TEST AND ADJUSTMENT VALUES FOR VEHICLE LEVEL AT FRONT AXLE

Number Designation Model 251 ECE+USA with front+rear steel suspension, except code 847 Model 251 ECE+USA with front+rear steel suspension, with Code 847
BE40.20-P-1002-02N Permissible difference in vehicle level between right and left side of vehicle ∠° 0, 6 0, 6
TEST AND ADJUSTMENT VALUES FOR VEHICLE LEVEL AT FRONT AXLE

Number Designation Model 251 ECE front steel suspension and rear air suspension Model 251 USA
with front steel suspension and rear air suspension
BE40.20-P-1002-02N Permissible difference in vehicle level between right and left side of vehicle ∠° 0, 6 0, 6
TEST AND ADJUSTMENT VALUES FOR VEHICLE LEVEL AT FRONT AXLE

Number Designation Model 251 with air suspension Model 251 AMG
BE40.20-P-1002-02N Permissible difference in vehicle level between right and left side of vehicle ∠° 0, 6 0, 6
TEST AND ADJUSTMENT VALUES FOR VEHICLE LEVEL AT REAR AXLE

Number Designation Model 251 ECE+USA with front+rear steel suspension, except Code 847 Model 251 ECE+USA with front+rear steel suspension, with Code 847
BE40.20-P-1002-03N Permissible difference in vehicle level at rear axle between right and left side of vehicle. ∠° 0, 5 0, 5
TEST AND ADJUSTMENT VALUES FOR VEHICLE LEVEL AT REAR AXLE

Number Designation Model 251 ECE front steel suspension and rear air suspension Model 251 USA with front steel suspension and rear air suspension
BE40.20-P-1002-03N Permissible difference in vehicle level at rear axle between right and left side of vehicle ∠° 0, 5 0, 5
TEST AND ADJUSTMENT VALUES FOR VEHICLE LEVEL AT REAR AXLE

Number Designation Model 251 with air suspension Model 251 AMG
BE40.20-P-1002-03N Permissible difference in vehicle level at rear axle between right and left side of vehicle ∠° 0, 5 0, 5
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