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B230F valve color 700 1992

posted by  someone claiming to be Jeppe on  Thu Sep 13 23:53 CST 2018 [RELATED]

Hi,
just got my head off my Volvo 740 from 92. One valve has a different color. Any ideas why?

Thanks!









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    B230F valve color 700 1992

    uid 37336's pic
    posted by  B20Paul. on  Mon Sep 17 17:19 CST 2018
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    last visit: Mon Oct 20 10:54 CST 2014
    [RELATED]

    That is oil from the valve seal on that valve. The intake valve will show up fast because you have a vacuum in the ports when idling and cruising.

    White exhaust valves is a tad too lean, but that is what you need to keep the cat con alive.







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    B230F valve color 700 1992

    posted by  someone claiming to be Jeppe on  Fri Sep 14 08:43 CST 2018 [RELATED]



    I tried to get the image in there... But I hear you. One of the intake valves is black. All others are white. Just curious what if someone knows what that could mean.








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      B230F valve color 700 1992

      posted by  someone claiming to be Jeppe on  Fri Sep 14 08:46 CST 2018 [RELATED]

      GALLERY/images/13212.jpg

      If you go to the image gallery I think you will find the image that I uploaded.









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        B230F valve color 700 1992

        posted by  someone claiming to be Jeppe on  Fri Sep 14 08:49 CST 2018 [RELATED]

        The picture of the head is currently the last uploaded picture here:

        https://www.brickboard.com/IMAGELIB/?js_link=1&pix_type=TECHNICAL








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          B230F valve color 700 1992

          posted by  porkface on  Fri Sep 14 09:05 CST 2018
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          last visit: Fri Oct 24 09:12 CST 2014
          [RELATED]

          incomplete combustion. leaking injector, poor spark and/or low compression. good luck, chuck.








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            B230F valve color 700 1992

            posted by  Volvo From Heck on  Fri Sep 14 09:24 CST 2018
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            last visit: Mon Oct 13 20:56 CST 2014
            [RELATED]

            I saw this post early in the morning and the photo was embedded--now it isn't. My first thought on finding white covered valves would be oil burning--with something else going on (like a leaky injector) in the cylinder with the black intake. -- Dave








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              B230F valve color 700 1992

              posted by  someone claiming to be Jeppe on  Fri Sep 14 10:39 CST 2018 [RELATED]

              Thanks for your responses. I'll get hold of a new injector and see if that helps. With that and a renovated head - that's pretty much all I can do for this car. A deeper teardown of the engine is beyond my skills.

              200k miles.

              It doesn't consume an abnormal amount of oil. Maybe a quart per 3000 miles.

              Will keep you posted on the results.








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                B230F valve color 700 1992

                posted by  boxvolvo on  Sat Sep 15 11:25 CST 2018
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                last visit: Fri Oct 24 04:28 CST 2014
                [RELATED]

                looks something like a burnt valve - which is usually an indication of excess air in the combustion chamber.

                What prompted you to remove the head?






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