Steering - Squeak/Squeal Noises When Turning

Steering - Squeak/Squeal Noises When Turning
Date: January 31, 2007
Order No.: T-B-46.20/31b
Supersedes: T-B-46.20/31a dated June 30, 2006
Group: 46
Revision History
Revision Date Purpose
b 1/31/07 Step 3 - Points a through d Added / Warranty Information Updated
a 6/30/06 Damage Code Revised
- 3/27/06 Initial issue
SUBJECT:
Model 163.154/157/172/174/175
Squealing / Squeaking Noises From Area of Rack-And-Pinion When
Steering in Both Directions
If you receive customer reports in the above model vehicles of squealing or squeaking noises when steering in both directions when the engine is
warm, the cause may be due to insufficient lubrication at the radial shaft sealing ring in the control head.
Lubrizol 6178 must only be used once in the steering system. No more than 50 ml of Lubrizol 6178 may be added. The prior use of Lubrizol 6178 in
the system can be verified by a yellow dot on the steering gear and power steering pump housings.
NOTE:
If the symptom continues to exist on vehicles where Lubrizol 6178 has been previously added, replace the steering gear per WIS Document No.
AR46.20-P-0600GH.
Follow below steps to add additive Lubrizol 6178 into steering oil:
1. Check whether Lubrizol has already been added. This can be verified by a yellow dot on the steering gear and power steering pump housings.
2. If Lubrizol has already been added, repair the vehicle by replacing the steering gear per WIS Document No. AR46.20-P-0600GH.
3. Ensure steering system is brought up to operating temperature (approx. 80 degrees C).
a. Start the engine.
b. Raise engine RPMs up to 1500 rpm.
C. Turn steering wheel from rack end to rack end and back with normal turning velocity. The steering wheel may be held at the rack end for
1-2 seconds.
d. Continue turning wheel as in step c until steering fluid is heated up to 80 degrees C (approx 20 minutes).
4. Suction off 50 ml of steering oil.
5. Pour in 50 ml of Lubrizol 6178 (NOTE: Shake bottle before pouring in).
6. Turn steering wheel to a limit stop with the engine running. Then hold steering wheel in this position for 1 - 2 seconds and quickly (in jerking
motion) turn the steering wheel out of the limit stop while increasing the engine speed from idle to approximately 1200 rpm. Repeat this
procedure at both limit stops until the noise is no longer audible.
NOTE:
It is possible to repeat this procedure up to 20 times before the noise is no longer audible.
7. Apply a dot with yellow touch-up paint on both the reservoir and steering gear housings. These markings serve as identifier that additive
Lubrizol 6178 has already been added to this vehicle and must not be added again.
2000 Mercedes Benz Truck ML 55 AMG (163.174) V8-5.5L (113.981) 307
Parts Information
NOTE:
The following allowable labor operations should be used when submitting a warranty claim for this repair.
In Case of Warranty
Operation: Marking - steering gear and reservoir, check (46-0000)
Power steering gear box/steering rack, replace (46-3610) Wheel alignment, perform (40-6500)
Front wheel toe angle adjust (with vehicle alignment check) (40-4064)
Bringing power steering temperature to 80锟紺 and adding Lubrizol, perform (46-0000) 2000 Mercedes Benz Truck ML 55 AMG (163.174) V8-5.5L (113.981) Technical Service Bulletin #
T-18_40-30B Date: 070226
Engine - Oil Leaks Between Oil Level Sensor & Oil Pan
Date: February 26, 2007
Order No.: T-B-18.40/30b
Supersedes: T-B-18.40/30a dated July 6, 2006
Group: 18
Revision History
Revision Date Purpose
b 2/26/07 Warranty Information Updated
a 7/6/06 Applicable Models Updated
- 8/15/05 Initial issue
SUBJECT:
Model 163.154/157/172/174/175
Model164.175
Model251.175
Model463.246/249/271
Leakage Between Oil Level Sensor and Oil Pan
If you receive customer reports in the above model vehicles of oil leakage between the oil level sensor and the oil pan, the cause maybe due to the
sealing ring being damaged by the burr at the oil pan installation hole. To resolve, remove and replace only the sealing ring as per the parts
information listed below. Lightly oil the sealing ring prior to installation.
Inspect the surface of the oil pan oil level sensor installation hole. If extreme roughness or sharp edges are found, de-bur the rough surface of the oil
pan hole with an emery cloth.
Parts Information
NOTE:
The following allowable labor operations should be used when submitting a warranty claim for this repair.
In Case of Warranty
2000 Mercedes Benz Truck ML 55 AMG (163.174) V8-5.5L (113.981) 308

Operation: Engine compartment panel, bottom - rear part, R&R (61-1072)