User Tag List

Thanks Thanks:  0
Likes Likes:  0
Results 1 to 9 of 9

Thread: Cylinder Head Bolts

  1. #1
    Regular Member Ste's Avatar
    Join Date
    Jul 2005
    Location
    ..... Driving the Jaguar XF
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats

    Vehicle : Jaguar XF 3.0D V6

    Trim : Black

    Engine : 3.0D V6

    Year : 0000

    Default Cylinder Head Bolts

    I had a bit of a strange phone call yesterday at work.

    We are doing some testing at an external test establishment.... on a new engine development. As I am the project manager for this new engine, the test Engineer suggested to the test technician he calls me (as he was on holiday).

    The upshot was that they needed to refit the head, but the bolts had been used the specified maximum number of times - ie 3.

    We do not have any spares, we could get some for Tuesday (as they are not available in this country). The testing is quite important, but we want any testing to be done robustly, accurately and correctly.



    So, what would people's opinion be on what to do?

    I will answer later what course of action was taken.
    Last edited by Ste; 3rd February 2012 at 20:24.

  2. #2
    Regular Member macdad's Avatar
    Join Date
    Dec 2007
    Location
    East Midlands
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default

    I'm surprised that you actually used the bolts on 3 separate occasions Ste i was always lead to believe that they stretch when installed on the first fitment or is that old hat now.

  3. #3
    Regular Member lee gsi's Avatar
    Join Date
    Mar 2010
    Location
    Hampshire (Near Havant) . .Drives: Signum 1.9 CDTi
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats

    Vehicle : Signum

    Trim : Design

    Engine : 1.9 CDTi

    Year : 2005

    Default

    Depends on the stretch bolts.

    Some bolts you measure and if they are longer than the set value they cant be used but if under they can.

    If they say they can only be used 3 times I would take it at that but I am sure they would be fine but you never know how long for,

  4. #4
    Regular Member Ste's Avatar
    Join Date
    Jul 2005
    Location
    ..... Driving the Jaguar XF
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats

    Vehicle : Jaguar XF 3.0D V6

    Trim : Black

    Engine : 3.0D V6

    Year : 0000

    Default

    Yes, they still stretch, but single use is just too damn expensive.

  5. #5
    Regular Member benny's Avatar
    Join Date
    Feb 2006
    Location
    dudley
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default

    cut a small amount of the bottom and reuse one last time ....place a "shim" washer under the head .....

  6. #6
    Regular Member Ste's Avatar
    Join Date
    Jul 2005
    Location
    ..... Driving the Jaguar XF
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats

    Vehicle : Jaguar XF 3.0D V6

    Trim : Black

    Engine : 3.0D V6

    Year : 0000

    Default

    The technician was absolutely right to ask for new bolts, as the old ones had been used the maximum number of times specified - ie 3.

    The bolts were inspected by an Engineer. The way to check for bolts that can be reused is to measure the stretch area - the non-engaged threads stretch the most and stretch fairly evenly up to the shank of the bolt.

    By using another bolt as a guide, using the engaged threads to compare the stretch on the other bolts, it is easy to see how much stretch has occured at the threads nearest the shank. If this stretch is less than about 25% of the thread pitch the bolt can be re-used. If it's much more, then it can't.

    These were M10x1.5 so if the stretch was less than about 0.4 mm they would be OK to re-use.

    As they were all less than this, and the bolt heads were not damaged (either scored, or bent) and the bolts were straight and hadn't 'necked' the engine was re-assembled and the tests continued.

    HAPPY DAYS !



    Benny, I don't understand why you would cut off some of the engaged threads and put a shim under?

  7. #7
    spoons
    Guest

    Default

    Quote Originally Posted by Ste View Post
    So, what would people's opinion be on what to do?
    Blag the last test results and pretend you did it. Get your subordinate to sign it off and go make some tea

























    (joke )

  8. #8
    Regular Member Ben50n's Avatar
    Join Date
    Dec 2011
    Location
    Seaham
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default

    Fit new bolts, a lot of work to strip an engine, it doesnt make economic sense not to wait and use new bolts.

  9. #9
    Ex Vec-C Admin Ian-Highlander's Avatar
    Join Date
    Jun 2008
    Location
    Ely, Cambridgeshire
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    61 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats

    Vehicle : Insignia Tourer

    Trim : Elite

    Engine : 2.0 CDTI (160ps)

    Year : 2010

    Default

    I've never used a set of head bolts more than once. Every single time I've had a head off I've replaced the bolts with new and then followed the appropriate tighten/heat up/re-tighten procedure for the relevant engine.

    Snapped one once even using new and still within the correct torque, ended up having to take the whole thing back off and get a company out to extract it from the block for me.
    "Doing a good job here is like wetting your pants in a dark suit, you get a warm feeling but nobody else notices"
    Maptun Tuned 2.0T Estate - click HERE for mods list.
    Brentwood 2012: Winner, Saturday Show. Hull 2012: Winner, Best Estate. Hull 2013: Winner, Best Estate & Runner Up, Best I.C.E

    Now Gone, bring on the Insignia (now "Teapot" Tuned)...

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Cylinder head
    By GCusdin in forum Engine & Drivetrain
    Replies: 2
    Last Post: 20th September 2012, 11:11
  2. is my Cylinder Head going
    By jinkie in forum Engine & Drivetrain
    Replies: 8
    Last Post: 4th January 2012, 09:25
  3. Cylinder Head
    By T4M in forum Vectra C / Signum Car Chat
    Replies: 2
    Last Post: 1st May 2008, 15:35
  4. Cylinder Head
    By Matt21385 in forum Engine & Drivetrain
    Replies: 3
    Last Post: 18th February 2008, 17:42

Visitors found this page by searching for:

vectra c diesel head bolts

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •