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1,6,7,8 - Series and Mini Cooper General 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.

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Old 03-23-2010, 10:27 PM   #1 (permalink)
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Noisy Engine 7 series

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:
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Old 03-23-2010, 10:34 PM   #2 (permalink)
OMFG another one!?
 
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You may wanna have the timing chain tensioner checked/replaced - and no driving before doing it. If the chain skips time, very bad things!
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Old 03-23-2010, 10:57 PM   #3 (permalink)
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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
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Old 03-23-2010, 11:33 PM   #4 (permalink)
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Thanks for the advice. I have been thinking that was the problem.
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Old 03-25-2010, 06:49 AM   #5 (permalink)
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A 1999 740i definitely has Vanos I think yours probably has single Vanos rather than double depends on the date of birth....
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Old 03-29-2010, 10:51 PM   #6 (permalink)
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what is a vanos??
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Old 03-29-2010, 11:10 PM   #7 (permalink)
OMFG another one!?
 
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Vanos is BMW's variable valve timing system.
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Old 03-30-2010, 04:53 AM   #8 (permalink)
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I am pretty sure that the dual Vanos appeared in the 1999 build 740, and is called the M62TU, Marti5 will correct me if I am off the mark.
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Old 04-04-2010, 01:21 PM   #9 (permalink)
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I have a 2001 740il and have the same rattling noise when the engine fire up from a cold start. Are there any technical document for a DIY job on replacing the chain and tensioner?
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Old 04-04-2010, 06:41 PM   #10 (permalink)
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ummm... if i were the car owner:

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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Old 04-14-2010, 01:23 PM   #11 (permalink)
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hi !!!


its really a informative post...


thanks for your information ...........
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