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#11
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#12
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Got the new tank and replaced it; took out ~ 3 litres of coolant before but still a bit of spill from the hose that connects to the bottom.
I could not find a leak or crack on the old tank but it could be just when is hot. I installed the new tank (it comes with a new sensor) and connected the hose; I noticed it has a bit of play and it can be rotated +/- 30 degrees with no effort. I did not check if the hose itself is supposed to have an inside o-ring (that could have been the culprit...) but I'm a bit worried about the movement; all other coolant hoses fit quite nicely and without any play. Did a couple of runs of the bleeding procedure before turning on the car; I couldn't see any leak and even when I rotate the hose nothing leaks but I guess will need to wait until it gets really hot and under pressure....have the feeling I may be back with a new hose....they are still out-of-stock on my parts supplier so will see.... |
#13
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After further testing, the connection leaks....so with no available parts, decided to check if there was an O-Ring in the connection; there was one, fairly worn and flat so took it out and managed to find a close one (OD:7/8" ID:5/8" and 1/8") it seems to be an exact match; there was one in MM (208 Buna-N O-Ring) but will take days to be shipped.
Installed the new O-ring, it fit 'fine' and the connection was much stronger and firm, still rotated a bit though but when I did the same test there was no leak from the connection I cleaned up and dried a bit of the spill and when I was about to close the hood, I saw a couple of drops coming from the Coolant Level Sensor? (It is brand new; it does not have any ring/washer only gets twisted in.....) is now too dark to keep checking so will need to wait til Saturday...... |
#14
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Same problem with mine. Looks to be leaking from the sensor as it seems kinda loose. Gonna remove my expansion tank and see if I could fit in a new O-ring like cls70 and keep the original part. Otherwise, I'm going aftermarket cause factory one doesn't last anyway.
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#15
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Quote:
At the end I think my leak was in the Hose connection; I replaced the Tank and replaced the O-ring inside the connection (inside the plastic end of the hose), will post pictures of the new vs old O-ring. So far (knock on wood) I have no leaks from it. The sensor does not have any gasket/o-ring but it could be that the leak is coming from somewhere else and drips through the sensor, it was hard to pinpoint the source due the location.
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E70 - 3.0si & F10 - 535ix Previous Cars: E34 - 525i, E39 - 530i, E60 - 530i |
#16
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#17
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I had the same leak. I only changed the tank and no problem solved. I also didn't find any cracks or anything on the tank... weird...but it WAS leaking at the bottom where the hose connects...
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#18
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The sensor doesn’t dip into the coolant so it should not require an o-ring, and there shouldn’t be a leak from that area unless it was cracked. My expansion tank is not cracked but I suspect it’s the hose connection point. With a small pick I was able to dig out the o-ring from the hose. Mine is definitely not flat but it’s super soft, and probably due to heat during operation. It should be a simple fix though. Can you tell me if the new o-ring needs to be fitted back into the hose, where i originally picked it out from, or should it go over the connection on the expansion tank?
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#19
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11537545278 This should be the part number for the o-ring and I found out it does need to be inserted back into the hose prior to connecting.
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#20
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Yes, I picked the old O-ring out and put the new one back into the inside of the hose end / plastic connector.
__________________
E70 - 3.0si & F10 - 535ix Previous Cars: E34 - 525i, E39 - 530i, E60 - 530i |
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