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imperfections in cylinderliner - headgasket issue?

Discussion in 'Technical Q&A' started by dieselchrisel, Jan 21, 2025.

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  1. dieselchrisel

    dieselchrisel Rookie

    Jun 1, 2024
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    chris
    #26 dieselchrisel, Feb 2, 2025
    I measured the protrusion of the cylinders - is 0.03mm all around. regarding the angle on the cylinder liner, the gap is approx. 0.01 - do you think the HeadGasket is able to level the gap out - or are new cylinderliners needed?

    like you aready mentioned the firerings are running a little bit outboard of the inner edge of the liner - so the gap should be a little less where the HG actually sits - what about also face milling them? is 0.02 protrusion of the cylinderliner enough?
     
  2. Fachmann

    Fachmann Rookie

    Mar 2, 2018
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    #27 Fachmann, Feb 2, 2025
    To properly measure the liner protrusion, you need to clamp them down with the special fixtures and use a dial indicator. Like I mentioned previously, 0.03mm is on the low end of tolerance. You cannot face mill the assembled liners because the final position of them is determined by clamping force. In your particular case, if a measured protrusion is within 0.03-0,08mm and equal throughout the cylinder bank, the head gasket will seal everything properly.
     
  3. dieselchrisel

    dieselchrisel Rookie

    Jun 1, 2024
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    #28 dieselchrisel, Feb 2, 2025
    thx for that info! - so in your opinion the gap on the liner to the straight edge twoards the combustion chamber is not an issue?
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  4. dieselchrisel

    dieselchrisel Rookie

    Jun 1, 2024
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    #29 dieselchrisel, Feb 2, 2025
    it kind does not conform to the "waviness" recommendation of less than 0.01mm over distance of 8mm
     
  5. Fachmann

    Fachmann Rookie

    Mar 2, 2018
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    #30 Fachmann, Feb 2, 2025
    That "waviness" applies to an actual deck with liners removed. From what I see on the pictures you shouldn't have any issues.
     
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