BMW X5 N63 V8 Engine Repair Oil Consumption - Valve Guides

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Stripping down and repairing an N63B44 BMW V8 from an E70 X5 50i petrol. The vehicle was consuming around 3 litres per 1000km! A BMW dealer had previously had the heads reconditioned and replaced the turbos. Upon stripping the engine to replace valve stem seals and further inspect for wear, we found that the valve guides had massively excess free play, allowing the valve to move around inside it. This males the valve wear through the stem seals, then with both the seal and the guide oversized, oil is able to easily bypass and be drawn into the inlet and exhaust ports. This vehicle was like a James Bond car driving it down the road and hitting the throttle! You can see in the video the amount of oil inside the intake manifold too. The heads were sent away to be reconditioned (again) and the machine shop said that the guides had not been replaced previously, and had not had inserts installed either. The heads were reconditioned and the engine reassembled with fresh gaskets, seals, and fluids. One of the timing chain guides was also replaced as it was cracked, and the engine timing was set. The engine was refitted into the car and ran great without blowing anymore smoke.

#e70x5 #bmwX5 #bmwspecialist

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