Do you need STAR after Arnott replacement?
03-02-2018, 12:13 PM
#2
03-02-2018, 02:32 PM
#3
MBWorld Fanatic!
Join Date: Jan 2014
Location: Republic of Texas
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'99 and '05 E55 AMG
And there is a procedure to follow to reinflate the rear air springs. STAR will walk you through it.
NOTE: Below has been edited to clarify the procedures.
For the rear air springs:
-Use DAS to reduce air spring pressure to ~3 bar. Loosen air lines on T-block at rear of car. Use DAS to complete releasing air bag pressure to atmosphere.
-Replace rear air springs.
-Tighten fittings on air suspension junction block. Note: do not over-torque! Literally inch-pounds.
-Use STAR to place ~0.5 Bar pressure in air springs.
-Use floor jack to raise control arm to ~-1.2 degrees drive axle angle (hub end higher than differential end); verify air bag is not sticking out sideways (like this < or >). Use DAS to inflate air bag to 2 Bar and verify air springs are straight. Torque lower air spring bolt to correct value. Lower the control arm to full extension of air spring. Inflate to 5 Bar. Verify air spring is straight. Repeat for other side.
-Lower car onto suspension, start car and let the air springs inflate to the programmed ride height using the compressor and reservoir. (I had an older battery in the car and tried this without starting the car. The battery could not support the procedure and the process shut down. Starting the car provided enough power to complete.)
-Check to see if suspension calibration needs to be performed. Front control arms should be between 3.1 and 4.1 degrees. Rear drive axles should be between negative 0.9 and negative 1.5 degrees. If in this range, and the front control arms are equal, you should not need to calibrate.
-Clear error codes.
NOTE: Below has been edited to clarify the procedures.
For the rear air springs:
-Use DAS to reduce air spring pressure to ~3 bar. Loosen air lines on T-block at rear of car. Use DAS to complete releasing air bag pressure to atmosphere.
-Replace rear air springs.
-Tighten fittings on air suspension junction block. Note: do not over-torque! Literally inch-pounds.
-Use STAR to place ~0.5 Bar pressure in air springs.
-Use floor jack to raise control arm to ~-1.2 degrees drive axle angle (hub end higher than differential end); verify air bag is not sticking out sideways (like this < or >). Use DAS to inflate air bag to 2 Bar and verify air springs are straight. Torque lower air spring bolt to correct value. Lower the control arm to full extension of air spring. Inflate to 5 Bar. Verify air spring is straight. Repeat for other side.
-Lower car onto suspension, start car and let the air springs inflate to the programmed ride height using the compressor and reservoir. (I had an older battery in the car and tried this without starting the car. The battery could not support the procedure and the process shut down. Starting the car provided enough power to complete.)
-Check to see if suspension calibration needs to be performed. Front control arms should be between 3.1 and 4.1 degrees. Rear drive axles should be between negative 0.9 and negative 1.5 degrees. If in this range, and the front control arms are equal, you should not need to calibrate.
-Clear error codes.
Last edited by bbirdwell; 05-30-2018 at 02:20 PM. Reason: Clarified steps in inflating air springs.
03-02-2018, 07:23 PM
#5
Member
My .02
I just did my fronts (both) and did not do anything other than R&R. It came out fine and ride height was the same as before. I had previous measurements to verify sport 2, normal and raised.
*********** To the E Guru's Do I need a star checkup? ************** I understand the rears are different. Please verify for me and others, - Thanks!
Rob
I just did my fronts (both) and did not do anything other than R&R. It came out fine and ride height was the same as before. I had previous measurements to verify sport 2, normal and raised.
*********** To the E Guru's Do I need a star checkup? ************** I understand the rears are different. Please verify for me and others, - Thanks!
Rob
03-02-2018, 10:02 PM
#6
MBWorld Fanatic!
I had no issues swapping my rears out and didn’t use STAR. Remove. Replace. Start the car. Drive. Enjoy.
12-02-2022, 04:06 PM
#7
