Get the rear manifold and Water Pump gaskets changed.
Inspect the O-rings in the coolant hoses,if you see a trace of rubber flakes on them,get that hose replaced.There's a tiny hose that goes from the Water Pump into the secondary thermostat close to the Transmission heat exchanger.That was leaking right away after I replaced the WATER Pump.
Valley Pan was the weakest point in the system,after it was replaced,pressure found another one.So those gaskets are a must do plus Water Pump O-rings and rear manifold O-Rings,they are the same as Water Pump ones.
I also replaced the X-rings on the Heat exchanger,they were leaking the last,and the X-rings along the secondary thermostat,some hoses.
Tomorrow I am done putting the engine together,some more hoses are replaced.So I have no old hoses left at all.
Quote:
Originally Posted by rt7085
I am due for an OSV replacement. I already have it. It produces a high pitch tone, very loudly when the engine is hot. Since my coolant level is very slowly decreasing, I suspect I have leaky valley pan gasket as well (as I see not other evidence of leaking hoses or gaskets). So, I am thinking that I should press on, and replace all these items in one session. A two day session that must be! That also allows me to slack the B+ cable with the intake removed and have an easy time with the driver side valve cover gaskets. These X5's all have the same issues...... pretty predictable when you read the posts.
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