Transmission oil change c230 - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 02-01-2011, 11:29 AM Thread Starter
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Transmission oil change c230

I have a 1997 c230 which has 2 drain plugs so that I can completely drain the ATF but I can't get either of them to budge... I tried heating them and just plain torquing them which is pretty tough to do... since they're just a simple hex type. I completely stripped the one in the pan before giving up and just dropping the pan, regardless I was only able to do a partial change with only the pan so... any suggestions or instructions on how to get those plugs to budge would be great.

Also if anyone has tried flushing the tranny through the cooling hoses, a quick walk-through on that would be great. I would of done it already but I wasn't sure which hose was from the tranny and didn't see one that seemed likely enough to hazard a guess, thanks for everything
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post #2 of 4 (permalink) Old 02-01-2011, 02:07 PM
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Spray a penetrator (WD40 or similar) and go have a snack while you let it do it's work. If the stripped head cannot be grasped at all by a smaller diameter socket or a specially made tool for extraction, or vice grips if it's already mangled. Some have suggested cutting a slot using a hack saw to put a screwdriver on but I doubt that will work if they are solidly in place.

You could also try warming the whole area again and then immediately hit the bolt head only with a spray of supercold compressed air. If you get right on it there may be enough shrinkage to the bolt to remove it. You would spray the bolt head with compressed air (the kind you use to clean keyboards) held upside down but DO NOT inhale the vapor or let it touch you as it is extremely cold and will cause damage quickly to skin and lungs. Spraying upside down will send cold liquid rather than air as you would get holding the can upright, and the liquid will begin to evaporate quickly. I'd try this as a last resort so you don't risk a fire or cracking the case due to temp changes, I'm assuming it's made of cast aluminum?

Whatever you choose to do, have spare plugs on hand so you won't be putting the same old ones in again.


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post #3 of 4 (permalink) Old 02-01-2011, 05:28 PM
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A manual impact wrench is useful for such things. I don't know that I'd use it on the pan since it would probably dent it, but I've used one for stuck fasteners all the time. Preload it when you use it (meaning put pressure on it and turn it in the direction necessary to loosen it) before striking it. If it hasn't been too badly roughed up I've never had that fail.

This is what they look like, just as an example. Any tool store will have it, as well as Sears, good hardware stores, even Harbor Freight if you have one around. I'm not sure about regular parts stores but they might. And I agree with LA about having the replacement on hand, too.

Good luck.

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post #4 of 4 (permalink) Old 02-02-2011, 12:03 AM
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I stripped my pan drain plug too, just grabbed a pair of locking pliers and got a good bite on the head of the plug, came out fairly quickly. I bought a new plug from autohausaz iirc
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