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Repairing rear window mechanism in 300SDL
Both rear window mechanisms in my recently acquired 1986 300SDL are broken; that stupid white plastic clip (slider) is broken. So I took both mechanisms out of the door.
My question concerns the big spiral spring that assists the mechanism. Is the spring supposed to assist the lifting of the window? Is it supposed to be in a non-tension state when the window is down? One of my mechanism has the spring assisting in the lifting of the window; the other has very little tension in either direction (this one looks like it may have been changed in the past) the spring is completely "relaxed" in the mid position--halfway up for the window. I tried preloading the second mechanism by removing the spring and rotating the mechanism 180 degrees. But this puts an incredible amount of preload on the mechanism. I don't think that is right. Any advice?
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Mike Frederick 1986 300SDL, 240K+ miles 1985 300D KaliKar, 270K+ miles |
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Answer
The white plastic clip (slider) is a common failure and cheap easy DIY.
The spring tension should be identical for both units, it sounds like one is damaged. I suggest you check the local salvage yards for a good used assembly. .
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ |
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