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  1. #1
    TIMBO151's Avatar
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    Unable to seat spark plug

    New to the forum and looking for a little help. I have a 2010 260x which I purchased used with 9hrs. I now have 20 and decided to check the spark plugs. #1 and #2 came out easily but i had trouble removing #3 and #4. The plugs were in bad shape so i decided to replace them. I replaced 1-3 applying anti seize and torqueing them to spec. When I installed a plug into #4, the plug is only going in half way. I don't want to force it and run the risk of snapping it off. Is there a special tool for cleaning the threads in the head or is it more serious than that? Has anyone had this problem before? Thanks for the help!!


  2. #2
    TIMBO151's Avatar
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    posted in the wrong forum sorry. trying to move to the correct one

  3. #3
    there is a tool, it a spark plug thread chaser, but dout it'll fit down in the hole with a socket on it, auto parts store might have a diff/newer model, the issue is when used small metal shavings can get into the cyl/piston area to cause problems, i pack the threads with heavy grease to catch the shavings and it has worked well but there is always the chance some may not be captured but its a chance you have to take OR prepare to pull the head.

  4. #4
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    heavy grease is great..so is running an air blower in there after the fact, which might blow out any remaining aluminum particles. You can get a local welder to add a few inches to the thread chaser so you can work it into the bottom of the plug tunnel. Back in the day we cut a few "V" grooves on the side of a new plug with a die grinder to clean up threads.

    Snapping a plug means big repair costs. proceed with great care. Might help putting the plug in a freezer for a while and without doubt a good coating with anti seize. inspect the plugs, it could have been a plug defect that hosed the threads

  5. #5

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    Hi Timbo151,

    Put the piston just below TDC so you don't damage when re-tapping, then use a deflater pump to vacuum any fillings that have dropped into the cylinder. You may have to adapt a hose to fit down into the cylinder plug hole, but sure you can figure that out. There are some quite powerfull inflate/deflate pumps out there. mains ones are more powerfull but the 12V ones work well too. If your still concerned that fillings might be in there, borrow a borescope to inspect.
    see attached link
    http://www.ebay.co.uk/itm/3-DAY-SALE...item20cb42b7f7

  6. #6
    BillyR-12X's Avatar
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    I just had to do this on two of my spark plugs, you need a 10mm-1 spark plug tap and an extension holder. I didn't have an extension so I took a 12" 3/8 drive extension and tapped the locking hole with a 10/32 tap and put a set screw in it to hold the tap, not a perfect idea but it worked well. After I tapped the threads clean I use a 1/4 magnet to pull the shavings out. Hope this helps

  7. #7
    Quote Originally Posted by BillyR-12X View Post
    After I tapped the threads clean I use a 1/4 magnet to pull the shavings out. Hope this helps
    so you found a magnet that will attract aluminum to it ? post a link or a picture of said magnet !

  8. #8
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    Unable to seat spark plug

    Or just pull the head off. And do it right.

  9. #9

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    Quote Originally Posted by 123456 View Post
    Quote Originally Posted by BillyR-12X View Post
    After I tapped the threads clean I use a 1/4 magnet to pull the shavings out. Hope this helps
    so you found a magnet that will attract aluminum to it ? post a link or a picture of said magnet !

    Pulling the head is the safest way, and the second best way is to cover tap with grease, (tap it in 3 to 4 steps cleaning and reapplying fresh grease, each time)
    Last edited by ange5583; 09-16-2012 at 04:41 PM.

  10. #10
    steve45's Avatar
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    Just curious, are the threads aluminum or do they have steel inserts?

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