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Thread: pesky upper timing chain guide bolts‏

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    Default pesky upper timing chain guide bolts‏

    Hi All,
    Had a bit of a problem over the weekend while attempting to do the head gasket on my 02 2.2 DTI (Diesel). Iíve been following the Haines manual and to remove the bolts securing the upper timing chain guide it states heat up the bolt to degrade the loctite to help remove, well I tried this and manages to break 2 Torx 30 heads so Iím obviously doing something wrong. Has anyone got any idea how hot it needs to get? As both bolts look like they are in the head can I get away without removing the tensioner or is there another way around this?

    Cheers
    Noel

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    Regular Member C-Owner's Avatar
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    You need to heat them up to "dark red" sometimes.

    See chart in link below

    http://www.sizes.com/materls/colors_...ted_metals.htm

    Also try tightening a fraction before releasing.

    And us quality torx bits (Snap On) as the cheap ones will break.
    Last edited by C-Owner; 22nd October 2012 at 22:22.

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    Regular Member 06sri's Avatar
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    might also pay off to use 1/2 torxs on a breaker bar - be carefull.

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    Cheers guys. 'Dark Red' = 700 degrees C, ouch thats hot, I'm slightly concerned about
    heating the head that much, I wonder if I can get away without taking the guide out?

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    Quote Originally Posted by Noeli0 View Post
    Cheers guys. 'Dark Red' = 700 degrees C, ouch thats hot, I'm slightly concerned about
    heating the head that much, I wonder if I can get away without taking the guide out?
    I did say sometimes "Dark Red" not all the time.

    Usually a good thorough heating will melt the loctite,
    but if the jobs been done before and you are doing other work like a head gasket,
    someone might have used a different compound to retain the bolts, loctite "Metal Set" for example.
    Last edited by C-Owner; 23rd October 2012 at 12:19.

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    thanks C-owner, I'll give it a shot taking the head off without removing the guide, otherwise I'm a bit stuck as a dont have a gas torch - will see what the weekend holds

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