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  #1  
Old 06-13-2021, 06:14 PM
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Unidentified Coolant Leak

My dad and I started to replace my water pump on my '07 x5 4.8i and we had to stop because of an outside issue. We had all the hoses off surrounding it and we put them back on while we were reassembling that area. After we were done reassembling, I went to put coolant back in it and after I filled it up to the max line of the expansion tank, it instantly started pretty much pouring out of the back of the engine towards where the engine meets the tranny. Would anyone know where the coolant would be leaking from? When I look into the bay there is absolutely no coolant where I can see, and there is maybe one or two drops on the front of the pan at the bottom. We're hoping it's not the head gasket, but I'm kinda guessing its the valley pan leak. Any help would be appreciated.
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Old 06-14-2021, 01:41 AM
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How far did you get during removal? The valley pan pipes I seem to recall attaching to the back of the water pump on the m62 motors I've worked on. They were pretty corroded and needed refurbishing before they would make a water tight seal but shouldn't be disrupted until you actually pull the pump.

If you loosened the pump bolts and then tightened back up, then good chance valley pan pipes.

If not; did you loosen any heater hose fittings or were you following step by step that included pulling the drain plug on the side of the block? (It's a step in the chain guides replace job).
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Old 06-23-2021, 06:53 PM
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Quote:
Originally Posted by andrewwynn View Post
How far did you get during removal? The valley pan pipes I seem to recall attaching to the back of the water pump on the m62 motors I've worked on. They were pretty corroded and needed refurbishing before they would make a water tight seal but shouldn't be disrupted until you actually pull the pump.

If you loosened the pump bolts and then tightened back up, then good chance valley pan pipes.

If not; did you loosen any heater hose fittings or were you following step by step that included pulling the drain plug on the side of the block? (It's a step in the chain guides replace job).
We got to the part of loosening the belt tensioner but we realized we were trying to loosen it the wrong way lol, I took it to a shop and they said I have a broken "Y" pipe which I'm assuming is where the coolant was coming from. They're gonna be replacing my water pump, thermostat, the broken pipe, a small pipe behind the water pump, and some gaskets involved with these issues.
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Old 06-24-2021, 12:58 AM
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There is a pipe that goes across the back of the engine I'm thinking that's what they are calling the Y pipe.
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Old 06-24-2021, 03:34 AM
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Could this be what they are referring to as the "y pipe"? I just replaced mine because one of the nipples was brittle and broke off. Which results in coolant being dumped on top of the engine underneath the intake.
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Old 06-30-2021, 12:01 AM
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There is a pipe that goes across the back of the engine I'm thinking that's what they are calling the Y pipe.
That might be what it was, I do know they had to remove the intake manifold though.
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Old 06-30-2021, 12:03 AM
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Originally Posted by harvinstl View Post
Could this be what they are referring to as the "y pipe"? I just replaced mine because one of the nipples was brittle and broke off. Which results in coolant being dumped on top of the engine underneath the intake.
That is probably what it was, they didn't tell me where the pipe was located other than they had to remove the intake to replace it.
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