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Captain Beaky

V8 Tapping Noise

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1 hour ago, mumbojumbo said:

Out of interest, if you leave the key primed for 10-15 seconds before firing up the car, does that improve things at all?

 

I shall try, what would be the reasoning behind this check?

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I've only experienced a Vanos rattle on a six cylinder Alpina but I'd have thought it'd sound similar on an M62TU

 

If it sounds like the videos in real life my money is on it being either Vanos seals or the Vanos check valve. Typical Vanos problem noise sounds very much like a diesel clatter and that's what I think your's sounds like. Timing chain noise is more like nuts in a can as it's lighter stuff rattling. The Vanos rattle is cause by the sprocket rattling on the helical splines on the cam so it's two relatively heavy bits of metal banging. 

 

Tappet issues on these are far more of a tick and not remotely rattley, I had one on my 540i that would always do it if I'd been spending a long time driving around town. 

 

This is just my opinion and I could easily be wrong. There must be a decent indy near you who can have a listen and say straight away what it is.

Edited by Oneball

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On 4/16/2018 at 10:59 PM, slam said:

Anyone on here got experience of replacing the 540 timing chain and VANOS or know how much it would cost in a garage?

 

 I took my 535i to a BMW Indy a fortnight ago  for a price and he said £2.5k, i thought he wanted to buy it not fix it!

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On 4/16/2018 at 5:39 PM, mumbojumbo said:

Out of interest, if you leave the key primed for 10-15 seconds before firing up the car, does that improve things at all?

 

Bang on Sir!!

I don't know if its a complete fluke or your onto something. Yesterday leaving for work I switched the ignition on and waited for 20 seconds or so and there was nothing, nothing at all!!

Same thing 10 hrs later at work ignition on and waited and bloody hell not a tinkle!

Today done the same thing but pah! rattling tap

 

What's your rationale for the delay before starting MJ ?

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It's not such a massive job it's just that there is lots to come off to get you where you need to be to address the issue.

You wont need the chain just the guides gaskets and check valves and the cam tensioner shoes. If the vanos seals are worn out they will need to be replaced either by the Beisan method or what i did, you will need to see if you need to replace the camshaft distribution piece also.

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This flaming noise is still there, sometimes nothing, sometimes just a slight noise and sometimes you think it's going to break something as its like a knock!

 

The only thing I am unsure of and it's just picking at me is the comment by MumboJumbo about priming? I leave the ignition on for 30 seconds and more often than not there is no noise??

 

Coincidence or Am i missing a trick here

Edited by Captain Beaky

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On 3/27/2018 at 12:22 AM, Captain Beaky said:

 

I only used 10w50 to try and partition the fault, by deliberately using a thicker oil to prove the vanos seal have worn. I don't see what adding Ceratec will achieve, you can't protect something that has already worn. Have you used it for this problem?

 

Start up is okay, warm start up after allowing the car to stand for an hour or more proves the oil is draining back but not a rattle every time??

 

I,m still not convinced however because  the engine is dead quiet on idle  there is NO vanos noise, I did read about air in the oil that will cause the tappets to slap the top of the valve stems, this does sound plausible and to me,  the sound is like hydraulic tappets like an old CHV when the tappets leaked back, but only for a few seconds.

 

I am not really ofay with Vanos systems and still don't understand the link between the vanos and the hydraulic tappets??? Is there one ?  A lot of threads describe it but not the why and how?

 

I am starting to wonder if people are just saying tappets and actually mean vanos

I used it to just to help smooth out the the anaemic and hesitant M54 engine on my 525i as well as to try and quiet down the (manual) gearbox rattle when worm (bearing play) . All perfect now and added benefit is lower consumption and more power (and less engine breaking effect as a consequence of the lower internal engine friction). Nothing short of miraculous. I do not work for nor have any affiliation with Liqui Moly.

 

This is where it helped with the dreaded N47 engine worn chain noise (not saying that a new chain my not be due):

https://www.pistonheads.com/gassing/topic.asp?h=0&f=72&t=1717717

The ceramic apparently coats the metal - both making it harder and slipperier at the same time - and in my experience it does reduce engine noise.

 

Edited by dmarkovina1
typos

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