Fourtitude.com - Vr6 timing chain rattle
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    1. 02-11-2020 04:05 AM #1
      Hi! Just replacet timing chains, guides and tensioners. Timing is ok and runs good for like 30sec. After 30 sec running timing chain starts rattle. What could be wrong? Should the upper tensioner feed hole face up while installed to engine? I can hear rattle only if oil fill hole is opened. Will post sound link soon.

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    3. 02-11-2020 09:20 AM #3
      doesn't sound that bad to me and i'm pretty sure the tensioner would only fit one way.

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    5. 02-11-2020 02:58 PM #4
      Quote Originally Posted by garryt View Post
      doesn't sound that bad to me and i'm pretty sure the tensioner would only fit one way.
      It's sounds normal for like 30sec after start and then rattle starts. I don't think it should sound like that. Before timing chain replacement it sounded even worse. Lower tensioner was loose.

    6. 02-11-2020 03:47 PM #5
      now that is weird. it's usually the other way round. did the new tensioner tighten to the engine block ok? there is a chance it could be something else making the noise, and the TC rattling covered it up.

    7. 02-11-2020 03:51 PM #6
      have a look at the thread posted by "01greengti" about the lifters ticking.

    8. 02-12-2020 02:30 PM #7
      I'm 98% sure it is chain. Tested oil press today. 6bar cold start. On 4bar rattle starts. When gets little warmer drops to 2bar. (did not run to 90°c) when revving its not rattling and after rev it does 2 sec idle ok. And then rattle starts. But weirdest thing here is, when i do warm start oil press is 4bar and chain is quiet.

      Here is some sound whit oil cap closed and open: https://youtu.be/GFMeDASfTqA

    9. 02-12-2020 02:31 PM #8
      Quote Originally Posted by garryt View Post
      now that is weird. it's usually the other way round. did the new tensioner tighten to the engine block ok? there is a chance it could be something else making the noise, and the TC rattling covered it up.
      New tensioner tighted ok. Also tried old one and does the same thing.

    10. 02-12-2020 03:55 PM #9
      where are you checking the oil pressure? and do the vr6's not have a valve between block and head? if so, maybe the valve is sticking???

    11. 02-13-2020 01:15 AM #10
      Quote Originally Posted by garryt View Post
      where are you checking the oil pressure? and do the vr6's not have a valve between block and head? if so, maybe the valve is sticking???
      Oil pressures from oil filter stand. What valve you mean? Something in oil press line?

    12. 02-13-2020 09:37 AM #11
      yeah there's a one way valve screwed into the block deck.

    13. 02-13-2020 09:43 AM #12
      did you replace everything? both chains/gears/guides etc?

    14. 02-13-2020 11:11 AM #13
      Quote Originally Posted by garryt View Post
      did you replace everything? both chains/gears/guides etc?
      Chains, guides and tensionet is new. Gears are old but they did look fine. Is there any way to test one way valve whitout head removal?

    15. 02-13-2020 01:22 PM #14
      there will always be a bit of wear on the gears too. but the fact it runs quiet at certain times is confusing. the oneway valve should be fine if the lifters are getting oil.

    16. 02-13-2020 01:24 PM #15
      do another oil pressure test with the temp at 90 and the engine idling, then get back to us

    17. 02-13-2020 01:33 PM #16
      i'm not that clued up on the vr engine, but you want to be doing a pressure test "post" filter. preferably on the cylinder head. if the oil filter is restricted and you do the test "pre" filter you will get high readings anyway, but the pressure could be low after the filter.

    18. 02-13-2020 01:57 PM #17
      There's not another location to install oil pressure gauge whitout making any holes (as i know). I tried today engine flush + replaced oil filter and oils. Before 5W-30 Now 5W-40. Does still the same thing. I'm going to check tomorrow uppper tensioner oil feed line. If there is some silicone there. Just to be sure. Also i will check the oil pressures when engine is hot. Also thinking if there is possible to drill small hole to feed line and attach gauge there.

    19. 02-13-2020 02:59 PM #18
      I wouldn't ever use silicone on a tensioner. they should be fitted dry and nipped up lightly or torqued down. there is also a chance the strainer in the sump is partially blocked.

    20. 02-13-2020 03:05 PM #19
      if you do the test with a new quality filter on you should get pretty accurate readings anyway.

    21. 02-14-2020 08:17 AM #20
      Quote Originally Posted by garryt View Post
      I wouldn't ever use silicone on a tensioner. they should be fitted dry and nipped up lightly or torqued down. there is also a chance the strainer in the sump is partially blocked.
      I did use silicone to timing chain cover, not tensioner. But tensioner oil feed comes throught timing chain cover, so theres little change of oil feed being stuck. New and old oil filters are oe quality, mann

    22. 02-14-2020 08:21 AM #21
      Also oil pickup was clean. Did replace oil sump gasket also

    23. 02-14-2020 08:41 AM #22
      well I would make sure the oil feed to the tensioner is clear first. then do a pressure test at idle/90 degrees oil temp and post your results

    24. 02-15-2020 03:52 PM #23
      Rechecked oil feed to upper tensioner, Was clean. Also oil filter housing and cooler was clean. Pickup is clean. When idle drops 4 bar oil. then rattle starts. Did not run yet for 90C. Also found intake manifold vacuum leak on shift rod drive unit sealant. Shift rod shaft gasket is leaking air. Is there change of reason of rattle is that?

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