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  1. #1761
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    Quote Originally Posted by MoleT-5R View Post
    Are they gasketed or sealanted normally? Not that I'd think a bead of sealant compressed sealant would make much difference tbh.
    Sealant mate, but as you say, cant see a very thin layer of sealant making that much difference and if it did,
    surely both cams would be tight?

  2. #1762
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    I'm told this problem is because of a warped head

  3. #1763
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    Oh No!
    1996 Olive Green 850 AWD - Follow the Project - Forged rods, 19T, big blue injectors, 960 TB, 3.25" MAF, Ostrich, 608 binary, arduino data display, active exhaust control with Focus RS tips, 320mm front brake conversion.
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    Quote Originally Posted by Dangerous Dave View Post
    Oh No!
    this would suggest all 4 heads I have here are warped in some way
    tells me that as soon as a head is removed, it will warp and be of no use, due to all the heat cycles it may go through in its lifetime

    damn it!

  5. #1765
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    That can't be right otherwise we would never be able to do the head gasket?

    Would it just "wear in"?
    1996 Olive Green 850 AWD - Follow the Project - Forged rods, 19T, big blue injectors, 960 TB, 3.25" MAF, Ostrich, 608 binary, arduino data display, active exhaust control with Focus RS tips, 320mm front brake conversion.
    1996 Nautic Blue 850 AWD - Failed its MOT, now it's a donor for the green thing.
    2004 Sapphire Black S60 D5 - The new daily hack.

  6. #1766
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    Quote Originally Posted by Dangerous Dave View Post
    That can't be right otherwise we would never be able to do the head gasket?

    Would it just "wear in"?
    That's what I was thinking, skim the bottom of the head maybe, but the top????

    Wear in, apparently not. The alloy will get hot and seize up, so I'm told..........?

  7. #1767
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    Have you actually checked to see if they are warped?

  8. #1768
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    Name:  IMG_0059.jpg
Views: 0
Size:  75.2 KB

    can see a gap under the straight edge

    for some reason the photo is upside down, but still.........
    Last edited by JT; Saturday 23rd January 2021 at 14:25.

  9. #1769
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    Hmmm

    Are all 4 the same then? Warped in the same place?

    What is the history of the heads?

    Is the block straight?

    A cylinder head specialist should be able to sort it either way, being aluminium it should be possible.
    Last edited by Dangerous Dave; Saturday 23rd January 2021 at 14:58.
    1996 Olive Green 850 AWD - Follow the Project - Forged rods, 19T, big blue injectors, 960 TB, 3.25" MAF, Ostrich, 608 binary, arduino data display, active exhaust control with Focus RS tips, 320mm front brake conversion.
    1996 Nautic Blue 850 AWD - Failed its MOT, now it's a donor for the green thing.
    2004 Sapphire Black S60 D5 - The new daily hack.

  10. #1770
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    Quote Originally Posted by Dangerous Dave View Post
    Hmmm

    Are all 4 the same then? Warped in the same place?

    I need to check the others

    What is the history of the heads?

    1 was in the car last time I raced
    2 came from BT
    3 came from an engine Dalhousie supplied, just has a broken valve, no need to suspect anything else
    4 I think I got years ago as it was a ported head

    Is the block straight?

    Cams are locking up just on the bench, not bolted to the block, but I'll check it

    A cylinder head specialist should be able to sort it either way, being aluminium it should be possible.
    Any recommendations down south for this?

  11. #1771
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    Have you tried torqueing one down on a block and then trying the cams in it then, funny how all four are the same..??

    Current Volvo's 1995 854 Gul T-5R 1996 855 Olive T-5R 1997 855 Olive AWD 1999 V70R AWD and 2005 XC90 D5 AWD
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  12. #1772
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    Quote Originally Posted by MoleT-5R View Post
    Have you tried torqueing one down on a block and then trying the cams in it then, funny how all four are the same..??
    Was thinking the same

    Torque it down and test with a straight edge
    1996 Olive Green 850 AWD - Follow the Project - Forged rods, 19T, big blue injectors, 960 TB, 3.25" MAF, Ostrich, 608 binary, arduino data display, active exhaust control with Focus RS tips, 320mm front brake conversion.
    1996 Nautic Blue 850 AWD - Failed its MOT, now it's a donor for the green thing.
    2004 Sapphire Black S60 D5 - The new daily hack.

  13. #1773
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    yes , that's when I first thought I had a problem

    something is not right????

  14. #1774
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    I've got to to rip the head off Gul's engine shortly, that one was well cooked and acting as a water pump, so I am expecting in to have warped it's head, so it will be interesting if I have the same issues., whilst it's in bit's I may well forge the bottom end and shim the block from added security, not that many people crack 2.3 liners, but better safe than sorry whilst I'm in there, future proofing I think they call it, as she is always receiving olives cast of upgrades...

    Current Volvo's 1995 854 Gul T-5R 1996 855 Olive T-5R 1997 855 Olive AWD 1999 V70R AWD and 2005 XC90 D5 AWD
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  16. #1775
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    Managed to get some time in the garage today, so took a couple of example vids

    one with a stuck cam (BTs old engine):


  17. #1776
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    And one of my others:



    really surprising the difference, but something must be wrong somewhere

  18. #1777
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    It's odd that on the one that the inlet is stuck on, you'd imagine both to stick if the warped head theory has anything to do with it.

    As for garage time, to cold for me and I have to sort the place out fully before starting or continuing any project at present

    Current Volvo's 1995 854 Gul T-5R 1996 855 Olive T-5R 1997 855 Olive AWD 1999 V70R AWD and 2005 XC90 D5 AWD
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  19. #1778
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    Quote Originally Posted by MoleT-5R View Post
    It's odd that on the one that the inlet is stuck on, you'd imagine both to stick if the warped head theory has anything to do with it.

    As for garage time, to cold for me and I have to sort the place out fully before starting or continuing any project at present
    it is a bit weird, on one of my heads, its the exhaust that is stuck????

    it is cold out there, that why I have heating in my garage! but its sounds like we both need a tidy up

  20. #1779
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    Are they completely dry ie no lubrication? If so could it be as simple as a gum type residue binding things up?
    Just trying to go back to the start to find root cause. Not trying to insult or upset.

    Sorry re-read from the start of the problem.

    So at what point of tightening the covers do they lock up?

    Might be worth doing a progressive tighten to see where it happens. Is the cam then hitting the cover? Or is the tightening causing an unwanted load somewhere?
    Last edited by Blackdog; Sunday 24th January 2021 at 20:29.

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  22. #1780
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    Quote Originally Posted by Blackdog View Post
    Are they completely dry ie no lubrication? If so could it be as simple as a gum type residue binding things up?
    Just trying to go back to the start to find root cause. Not trying to insult or upset.

    Sorry re-read from the start of the problem.

    So at what point of tightening the covers do they lock up?

    Might be worth doing a progressive tighten to see where it happens. Is the cam then hitting the cover? Or is the tightening causing an unwanted load somewhere?
    I cleaned the points of contact before installing the the cams, putting a small amount of fresh oil on the contact points, so they are not dry
    and all seems well. place the cam cover on and push it down, then some cams become tight.
    I say some, as we are talking 4 different heads.
    Tighten up the bolts only seems make things worse

    are the cams hitting the cover? what makes you say that?
    that had crossed my mind, why they would I don't know, but interested in your thoughts

    I know there is a specific way to torque the head bolts, is there one for the cam cover?


 

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