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  #1  
Old 04-07-2006, 03:01 PM
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W210 Transmission Fill Cap

I feel stupid here but, for some reason, can't get my transmission fill cap to snap back on after doing a transmission service. When I removed the cap I broke off the red tab and pushed the stem through with a small screwdriver and the cap came right off. When I try to replace it with a new tab it will not snap down. It seems like I'm missing something. The cap just slides right back off - the tab not engaging anything. The notch in the tab looks like it should engage the flange on the fill tube but is too far away.
What am I missing?

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  #2  
Old 04-07-2006, 03:29 PM
Ali Al-Chalabi's Avatar
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The red tab is a one-time deal. You need to purchase a new red tab to get the cap back on. It gets broken in the removal and you need a new one to resecure the cap.
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Old 04-07-2006, 03:55 PM
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I would appreciate another try. As I said, when I try to replace with new tab the cap doesn't want to engage.
Thanks.
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  #4  
Old 04-07-2006, 03:58 PM
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I have never found a need to replace mine. The cap is pretty snug on there and now that I have the dipstick tool, I will likely check the fluid level at least at every service.

Len
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  #5  
Old 04-07-2006, 09:08 PM
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My Cap doesn't fit tight at all. In fact, I'm sure it would fall off due to vibration, etc., if not mechanically attached with the lock tab. I am puzzled. Can anyone give me some guidance?
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  #6  
Old 04-08-2006, 12:08 AM
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Does your cap still have the rubber O ring on it? That's what makes mine fit so tightly.

Len
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  #7  
Old 04-08-2006, 02:43 PM
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No, I don't have an O ring. I guess it would fit on the plastic snout on the cap and go inside the transmission fill tube. There is no groove for an O ring. That would help and I will see if I have one to fit it. I would still like to know why I can't get it to latch into place.
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  #8  
Old 04-08-2006, 10:17 PM
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Look down the tube with a light. The o-ring may be in there.
If so, pull out and put back on cap.
Dr.D
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  #9  
Old 04-10-2006, 02:57 PM
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I found an O ring in my collection that worked. Now the cap fits snugly enough that I am comfortable just stabbing it onto the fill tube. There was no O ring in the fill tube. Either it was never there or was lost when I removed the cap. I am still very interested in why my cap won't latch onto the fill tube with a new lock tab. Any thoughts??

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