Mercedes Benz

Steering - Steering Gear Leakage Information Date: June 21, 2007 Order No.: T-B-46.20/58 Supercedes: Group: 46 SUBJECT: All 163, 164 and 251 Models Equipped with Rack-and-Pinion Steering Steering Gear Leaking Under Dust Cap on Control Head During inspection of returned power steering racks, we have encountered cases where steering racks have been replaced due to "leaking" but which prove to exhibit merely "sweating" or a film of grease under the dust cap on the top of the control head. If during power steering complaint diagnosis, moisture on the surface of the steering gear under the dust cap is noticed in a localized section, this is considered sweating due to grease liquefying and not leakage. This moisture can be caused by: ^ Grease under the dust cap to keep dirt (dust) away from the steering system. ^ Heat from the engine causes some of the grease under the cap to liquefy which produces a slight but noticeable moisture/grease film on the ...