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Thread: Td5 intake manifold.

  1. 30th June 2014, 08:52 PM #11
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    Quote Originally Posted by d2dave View Post
    If the Td5 engine has the combustion chamber in the piston like a Tdi, and looking at RAVE this appears to be the case, machining the head makes no difference to the head gasket thickness.

    You just check what the old gasket was and replace with the same.
    Can you explain why this is the case? Seems weird to me.
    Cheers
    Slunnie


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  2. 30th June 2014, 10:43 PM #12
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    The gasket thickness is to allow for piston protrusion above the top of the block. Machining the head has no effect on piston height.

    And according to RAVE the head should not be machined, although I believe that some have done it.
    Dave.

    I was asked " Is it ignorance or apathy?" I replied "I don't know and I don't care."


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  3. 30th June 2014, 11:03 PM #13
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    Quote Originally Posted by d2dave View Post
    The gasket thickness is to allow for piston protrusion above the top of the block. Machining the head has no effect on piston height.

    And according to RAVE the head should not be machined, although I believe that some have done it.

    RE Gasket thickness, correct...

    http://www.aulro.com/afvb/technical-...thickness.html

    However, plenty have had the head skimmed with no ill effects
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  4. 1st July 2014, 08:52 AM #14
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    Quote Originally Posted by Will Wallace View Post
    Jason,

    What are the crucial measurements that need to be taken and what are the tolerances?

    I assume that one would be piston protrusion?


    Cheers
    Will
    When you get the head shaved, find out by how much, and compensate with the gasket accordingly.

    Cheers,

    Jason
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  5. 1st July 2014, 10:14 AM #15
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    Quote Originally Posted by Jason789 View Post
    When you get the head shaved, find out by how much, and compensate with the gasket accordingly.

    Cheers,

    Jason
    Jason. I assume what you are saying is that if .010 inch is removed from the head then use a .010 thicker gasket, yes?
    Dave.

    I was asked " Is it ignorance or apathy?" I replied "I don't know and I don't care."


    1983 RR gone (wish I kept it)
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  6. 1st July 2014, 05:09 PM #16
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    It's also to compensate for the valve to crown clearance Dave, not just crown protrusion.

    Usually a skim wont cause an issue if its never been machined before but it depends which side of "erring" it ended up with when the original gasket thickness was selected.
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  7. 1st July 2014, 07:36 PM #17
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    My research tells me that no more than .009 thou is the max that can be taken off a Td5 head. With this amount the valves should be ok.
    Dave.

    I was asked " Is it ignorance or apathy?" I replied "I don't know and I don't care."


    1983 RR gone (wish I kept it)
    1996 TDI ES.
    2003 TD5 HSE
    1987 Isuzu County
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  8. 1st July 2014, 08:27 PM #18
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    My 20 years in engine building tells me it's a mistake that is still made.
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  9. 1st July 2014, 08:44 PM #19
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    Quote Originally Posted by LOVEMYRANGIE View Post
    My 20 years in engine building tells me it's a mistake that is still made.
    So which is the mistake. Taking any off or being able to take more than .009
    Dave.

    I was asked " Is it ignorance or apathy?" I replied "I don't know and I don't care."


    1983 RR gone (wish I kept it)
    1996 TDI ES.
    2003 TD5 HSE
    1987 Isuzu County
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  10. 1st July 2014, 09:31 PM #20
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    The .009" you take off the head moves the valve face .009" closer to the piston crown unless you recut the valve seats to adjust the valve face protrusion from the head face back to its original measurement.
    The overall clearance you're measuring is the crown to valve face and this is where the head gasket thickness comes in.
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