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Its a 1992 740 RWD wagon, B230 turbo. It suddenly overheated on the road. I pulled over/stopped immediately. I only had a jack that would raise car a few inches, had to work mostly by feel ...I could see a massive leak at bottom of engine, on the right, opposite the tranny pan. The coolant hose there had become softened, and burst, I think it ran dry pretty quick. Well, I attempted to replace this line roadside. While yanking on what I thought was the leaking coolant hose I pulled off another rubber hose of the same diameter right next to it. So I had two bad hoses off at the same time, and I have found four open barbed ports/connections for hoses with car back at my garage. But the way they seem to have been run doesn't make sense. There are two flex rubber hoses going to what may be an oil cooler adapter where the oil filter is screwed into engine. Upper connection is still connected to a hose. When I fill up the coolant reservoir, water runs freely out the lower port (one of the four open ports I can see. This doesn't make sense...shouldn't this be a port for an oil line? But the way water pours out of it, it must be going straight back to the coolant reservoir. The other place water pours out of freely at the same time is an open metal hard-line right below the oil filter. I think this is supposed to be the low-point drain...but on my engine, there is kind of a tee, but no valve! It was at this connection where the rupture occurred.
The other two open ports that (I think ) were opened up when I pulled off a second rubber hose inadvertently are a barbed port that comes out of the side of the tranny case, and a barbed open metal line going forward and up to the turbo. I don't know if the port seeming to come out of the side of the tranny is supposed to be oil or what, but sure isn't water! The fourth open hard line connection is a metal line going to a lower forward fitting on the turbo. I have not lost any engine oil, and it doesn't make sense for tranny oil to be going up to the turbo unit...that's for sure! Both hoses that I have off the engine are about 3/4 in. I/D. One is abt. 5 in long and the other around twice as long. Both lines were very oily, but no water or oil or anything really poured out of the send line I accidentally pulled off. Again, both of these lines are in the area, very close to the oil filter.
I have a Haynes manual, but it is completely worthless for coolant line routing and oil line routing! I have not located anything showing this on the internet so far. I don't want to take any chances with connecting up the new hoses wrong, and destroying/burning up the engine...if it isn't already.
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