1,6,7,8 - Series and Mini CooperGeneral Chat related to models that do not fit into particular categories above. Please try to put your discussion in more appropriate sections. This section does cover the 1 Series, MINI Cooper and 8-Series vehicles: BMW 830i, BMW 840Ci, BMW 850i, BMW 850Ci, BMW 850CSi, M8, Alpina B12, BMW CS Concept and others.
I have a 1999 740i with 135k miles. When I start up it sometimes has a rattle that gets worse as the engine gets hotter you hear it when it is idling. The sound seems to come from the front at the timing cover. I have read about the vanos unit needing to be replaced on other series but, I have heard mine doesn't have that. If that is the case could it be the timing chain components? Has anyone had this problem with a 7 series? I appreciate any info. Steve:
yes very bad things is correct talk about possibly bending/ breaking every valve in your motor trust me it take 1/20 of the time to replace a damn timing chain and gears and costs so much less than having to replace your valves and maybe your whole head
I would instead take out the serpentine belt and start the engine and check if the sound persists.
at 135,000 miles. it is hardly likely that VANOS or timing chain & auxilliary components are at fault...
the rattle i.e. rapid succession of tick-tick-tick* that increases with RPM's just might be a faulty belt tensioner only although if & when you listen, it sound like it is coming from the timing cover.
I suggest you eliminate that first, before you suspect more complicated things
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