S54 ticking tapping noise

Discussion in 'Engine maintenance, upgrades and modifications' started by Simas323, Oct 20, 2019.

  1. 20 Oct 2019 at 4:12 PM #1
    Simas323

    Simas323 A mere Chipper

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    Hello guys,

    Recently my S54 started to make ticking noises similar to hydraulic tappets noise on m5x engines when hot. It is not a strong noise, but you can hear it and it wasn't there before. Here is a video:

    https://youtu.be/3tsy_1On49s

    Few days ago I checked valve clearance and few shims on exhaust side needs to be changed, but it didn't made that sound before or after checking.

    I removed the valve cover and all valve shims are still there, all rocker arms in place, there is some wear on cams and rocker arms but there was no significant wear that wasn't there before (I did headgasket 4months back).

    With screwdriver, I listened to all cylinders and the noise seems to be most audible from the last cylinder. I also tried unplugging coil packs one by one with engine running to identify that it is indeed valvetrain related , and noise didn't disappear.

    Some pictures with valve cover removed, where some scoring can be seen:

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    What do you guys think?
     
  2. 22 Oct 2019 at 10:14 PM #2
    m3rosco

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    Are the rockers where the camshafts contact them nice and convexed in shape? or are they flattened? When a couple of my rockers went flat, despite being shimmed to spec, they were still noisy. Ended up replacing with Schrick DLC coated ones which were cheaper than OEM.
     
  3. 23 Oct 2019 at 8:08 PM #3
    matty872

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    Have you done many mile's since doing the head gasket? It is quite possible you have a flat follower as already said.
     
  4. 26 Oct 2019 at 6:10 PM #4
    Simas323

    Simas323 A mere Chipper

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    Today I replaced 4 exhaust shims that weren't up to spec. Still the same - when cold it sounds great, when it reaches around 50-60 the noise starts to get audible and it peaks when engine is warm.

    All rockers I checked didn't seem like they have any flatspots ( I touched them), some of them have light scraping, but nothing out of ordinary to cause such looseness.

    I've driven around 600-800km (400-500miles) since the headgasket. I also checked compression and removed aux belt to see if was from any of the aux, but it wasn't.
     
  5. 30 Oct 2019 at 9:48 PM #5
    monkeyboy

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    You can get ticking noise from the vanos when there is excessive wear on the gears. Sounds very similar to how mine was, ended up replacing the vanos and the inlet hub.
     
    Last edited: Nov 1, 2019
  6. 8 Nov 2019 at 11:23 AM #6
    gregl342

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    OP did you resolve this? Thinking I should do VANOS refresh and wondering if you did the same and it quietened things down a bit?
     
  7. 11 Nov 2019 at 8:10 AM #7
    Simas323

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    I didn't resolve it yet. Don't want to take the head off again yet but start to lose hope to find anything. I checked Vanos exhaust hub, no broken tabs, before that I had anti-rattle done as well as all new gaskets.
     
  8. 11 Oct 2020 at 4:27 PM #8
    Ronan

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    Did you find the source of the noise?
     
  9. 11 Oct 2020 at 4:53 PM #9
    monkeyboy

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    the anti rattle doesn’t address worn vanos gear hubs
     
  10. 11 Oct 2020 at 7:39 PM #10
    Chady

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    I found busted inner valve spring in the past , didn’t notice until I was lapping in the valves
     
  11. 14 Oct 2020 at 7:45 AM #11
    kully15

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    Might be nothing but Cyl 6 exhaust valve spring, the paint markings are at the top when they should be at the bottom. This is stated by BMW and I read it when following www.newtis.info to rebuild my engine/head


     
  12. 14 Oct 2020 at 8:49 AM #12
    Chady

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    Yes that spring is fitted wrong ,, I’ve posted previously on Busted spring that was fitted by dealership or factory ,, on csl head ,, the inner spring was actually snapped,, but didn’t notice until I rebuilt the head and Lapping in the valves,, there’s a note in the tec regarding the springs on install,, From memory the Spring coil is different at each end,,
     
    Last edited: Oct 14, 2020
    kully15 likes this.
  13. 23 Oct 2020 at 1:15 PM #13
    Simas323

    Simas323 A mere Chipper

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    I completely rebuilt the bottom end in early spring. Last year it developed additional sound and lost compression in first and last cylinder. Ring seats/lands broke down and scratched the cylinders (Main reason I suspect is due to previous HG failure and detonation in cylinders). It was bored to 87.5mm with forged JE pistons (stock compression), new chain, chain guides, main and rod bearings. Back then we suspected that the noise was from the pistons.

    Engine runs strong now with 12bar compression in all cylinders but the tapping noise is still there! We haven't done anything with the head besides skimming it as it was fully rebuilt before when the engine had shot headgasket between all cylinders.

    We identified that it comes from the exhaust side and it depends on oil temperature and thickness. With new oil (10w60) it takes around 20min of driving with warm engine for the sound to appear. After first drive sound appears as usual with engine oil above 60c. I've put around 2000-3000km after rebuild including trackdays and autocross events. Tapping does not get any worse.

    Upon inspection they looked fine when we did engine rebuild.




    As for springs fitted wrong, it is possible, haven't thought of that! The link doesn't seem to work though, is there alternative link?

    The only problem is that there were no tapping sound and it appeared after 600-800km of driving after I replaced headgasked with fully rebuilt head (that was before bottom end rebuild), also it appears with warm engine (when oil thins out a bit)
     
  14. 28 Oct 2020 at 8:37 AM #14
    monkeyboy

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    Have you checked the vanos gear??
    As said mine did this, so rebuilt the vanos with the besian kit, put it all back together still had the faint ticking, turned out to be the vanos gear in the inlet hub, bought one of hack engineering and replaced it and cured the problem.
    I actually have a spare inlet vanos hub if you wanted it to see if it cures your issue.
     
  15. 28 Oct 2020 at 8:47 AM #15
    Coolbiker

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    You say when its cold it sounds OK.

    Could that be a clue?

    Metal expands when it gets hot, clearances get smaller not bigger, oil on the other had gets thinner.

    With winter coming and colder temperatures you may find it gets quieter.
     

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