Engine noise N57 F07

[Paulinelinker]

Greetings. I began to detect a grinding noise emanating from the lower section of the engine, particularly from the starting motor, only when the engine is heated.Thank you for your assistance.

[Ortsmatt]

Your article lacks sufficient information for others to provide relevant advise.

[Paulinelinker]

Apologies, I recently replaced the timing chain and oil pump.The vehicle emitted a metallic noise at approximately 1500 rpm, resembling a hissing sound, and a grinding noise at idle. However, after replacing the timing chain and oil pump, the hissing noise at 1500 rpm disappeared, yet the grinding noise at idle persists. Upon cold starting, the engine runs smoother than ever, but as it reaches operating temperature, it gradually resumes producing the grinding noise at idle. I initially suspected issues with the timing chain, but I remain uncertain about the underlying problem.Later that day, I went underneath the vehicle and saw a metallic grinding noise emanating from the starting located between the gearbox and engine connection. Additionally, the whole starter was coated in oil, as seen in the accompanying image.I would appreciate any advise that might be provided.Thank you.

[Ortsmatt]

Remove the starter and inspect the flywheel rivets for any signs of loosening.

petroleum leakage I suspect the rear crank seal is leaking; was it replaced during the timing chain installation?

[Paulinelinker]

Thank you. I will do an examination. Regarding the oil, everything has been replaced; however, I suspect the hoses for the gearbox are the issue, since they are leaking. The oil is red, which indicates it is gearbox fluid, if I am not incorrect.

[Ortsmatt]

I first overlooked the red tint; nevertheless, gearbox oil should not be red. ZF oil initially has a green hue, which transitions to a brownish tint with time.

[Paulinelinker]

Indeed, everything is as you said; but, my primary problem is to the noise. I am unable to post a video here, but the noise is really bothersome. I must resolve that issue first. Thank you for your assistance.

[TDudette]

Could you refrain from uploading the video to YouTube and then posting the link here?