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Thread: Lotus head plug removal

  1. #1
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    Lotus head plug removal

    What size hex key do I need to get to remove the plugs in the head? My center one is leaking causing coolant to get into spark plug hole causing misfires.

  2. #2
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    Re: Lotus head plug removal

    Figured it out on my own since nobody could tell me here or on Facebook. It's 9/6 or 14mm hex. Had to order one online since no local store carried that large of a hex.

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    Re: Lotus head plug removal

    Quote Originally Posted by HSKR View Post
    Figured it out on my own since nobody could tell me here or on Facebook. It's 9/6 or 14mm hex. Had to order one online since no local store carried that large of a hex.
    So are you pulling the head to have it welded then? I'm sure you already know that its not the plug that is leaking but the crack or cracks radiating from the plug and that just adding sealant and a new plug wont stem the flow of coolant.

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  4. #4

    Re: Lotus head plug removal

    Quote Originally Posted by HSKR View Post
    Figured it out on my own since nobody could tell me here or on Facebook. It's 9/6 or 14mm hex. Had to order one online since no local store carried that large of a hex.
    If you have a welder, you could make tool with a bolt and a nut or two...

  5. #5
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    Re: Lotus head plug removal

    I don't have a welder. It's had a small seep since I've owned the car, just never bad enough to cause problems. If re-sealing it won't help then I will have to get it welded. But for now, just doing what I can in my garage to try.

  6. #6
    Supporting Member Turbo Mopar Contributor 2.216VTurbo's Avatar
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    Re: Lotus head plug removal

    Quote Originally Posted by HSKR View Post
    I don't have a welder. It's had a small seep since I've owned the car, just never bad enough to cause problems. If re-sealing it won't help then I will have to get it welded. But for now, just doing what I can in my garage to try.

    So since I've been down this road, my advice is to leave the plug alone. Build a dam of multiple layers of RTV around the plug galleys so the coolant can run out of the side drain and NOT down into the plug(s) Welding on the car will not work, in fact, your cylinder head guy might not even have the skilz yo. Head has to be immaculately clean and heated before welding. Better to just live with it and keep adding coolant until it is good timing to pull the head.

    AJ (no More Alan) 84 Rampage RT TIII/568 Quaife 87 GLHS dealer optioned Red 16V Masi/568/Quaife
    90 Masi 16V White/Ginger/Black
    89 TC Masi 16V Red/Ginger/Black
    86 GLHS #110 RoadRace Built 89 CSX-VNT Recaro Car
    89 Turbo Mini 'Woody' 85 GLHT 'RedBox'
    2014 Explorer DD'r 3.5Twin Turbo Ecoboost AWD and 500HP
    My profile page has over 20,000 views, I'm somebody LOL

  7. #7
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    Re: Lotus head plug removal

    The head guy I will take it to when time definitely has the skills. Most respected guy in area, member of multiple winning engine building masters challenge teams, and does head work for a few salt flats speed racers. He makes his own tooling as well. All he does is engine head work, nothing else.

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