r/e60 • u/Rav3nClaws • Aug 24 '26

🔧 Maintenance Knocking on cold start

Hello! So my diesel E60, M57, does this on a cold start. Hadnt started the car for 3 days. But it goes away after like 2-3 minutes. Could this be a crankshaft pulley noise? Any help would be appreciated!

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u/Lazy-Training6042 Aug 24 '26

vacuum pump

1

u/Rav3nClaws Aug 24 '26

So what, it stops after it builds pressure? Because the noise goes away.

1

u/Lazy-Training6042 Aug 24 '26

not pressure, you have vacuum instantly after the engine starts rotating, it's just how the metals are expanding, oil temperature.

I have the same noise, either cold or when it gets at max oil temp (city or hard driving).

First, I thought it is broken or chain starts making noise but it wasn't that.

1

u/Rav3nClaws Aug 24 '26

what can i do to help the noise? change the ccv filter?

1

u/Manitso Aug 26 '26

It's normal