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Crossed spark plug thread

2»

Comments

  • #32
    kadman
    Moderators, Home & Garden Moderators Posts: 5,052 Mod ✭✭✭✭kadman


    [QUOTE=MrCostington; You will have me on Tick Tok next lol[/QUOTE]


    You went on the clock the minute you started this thread.


  • #33
    LollipopJimmy
    Registered Users Posts: 5,429 ✭✭✭LollipopJimmy


    kadman wrote: »
    Sash cord was used because its firm enough that when you pull it out,
    it all comes out, and does not get caught. Unlike a fabric type of material,
    you may leave bits in there. I suppose lawnmower starter cord is much the same thing.

    Fingers crossed these smeared in grease should catch all the material.

    Youtube proper use of reverse chasers before you start.

    I am surprised that no other classic car owner has had to repair a damaged plug thread,
    because in the beetle world i have seen a few.
    I did but I pulled the head, got a replacement from a scrappy and gave it fresh valve guides and valve stem oil seals. I was under the 500 quid including the machine shop work.

    I dont like the idea of repairing in situ but I am also a glutton for punishment


  • #34
    kadman
    Moderators, Home & Garden Moderators Posts: 5,052 Mod ✭✭✭✭kadman


    LollipopJimmy wrote: »
    I did but I pulled the head, got a replacement from a scrappy and gave it fresh valve guides and valve stem oil seals. I was under the 500 quid including the machine shop work.

    I dont like the idea of repairing in situ but I am also a glutton for punishment

    So you replaced the head, but you didn't repair the damaged one.

    Thats an option for the op.:)


  • #35
    Exodus 1811
    Registered Users Posts: 164 ✭✭Exodus 1811


    Following this with great interest.

    The below could be completely ridiculous, but anyways...

    Would it be an idea to fill the chamber with petrol so that any light swarf will be suspended, then post cleaning of the threads, suck it out?


  • #36
    MrCostington
    Registered Users Posts: 1,241 ✭✭✭MrCostington


    kadman wrote: »
    I am deadly serious about the heads , I have a few scrap ones.

    I am next door to Kilbeggan racecourse.
    Parachute cord will do too, or lawnmower pull cord.

    Of course you wont be able to leave a pull cord in the plug obviously, no matter how light.

    Might work.

    Would you have to come far??

    Many thanks, I really appreciate that, but I'm in Dublin so it would be about 3 hr round trip. I'll try without, thanks.

    I think you misunderstand my use of the word parachute, I made this:

    chute.jpg

    Re tic tok, that was a joke. I'm not one for social media so I don't post on YT. tic toc is a video sharing app the young people use lol. I have booked hair and makeup for my YT début !


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  • #37
    LollipopJimmy
    Registered Users Posts: 5,429 ✭✭✭LollipopJimmy


    kadman wrote: »
    So you replaced the head, but you didn't repair the damaged one.

    Thats an option for the op.:)

    Sorry, the car was still running, just the plug was working its way out due to worn threads, I rebuilt the replacement which meant the car was only down for a couple of days when swapping over. Worked for my situation at the time - dailying a classic!


  • #38
    MrCostington
    Registered Users Posts: 1,241 ✭✭✭MrCostington


    kadman wrote: »
    So you replaced the head, but you didn't repair the damaged one.

    Thats an option for the op.:)

    The cost would be the hours involved. I'd have to get a pro to to it. I've been looking at your videos with envy (your workshop, and skill of course), I'm doing this on the roadside.


  • #39
    MrCostington
    Registered Users Posts: 1,241 ✭✭✭MrCostington


    Exodus 1811 wrote: »
    Would it be an idea to fill the chamber with petrol so that any light swarf will be suspended, then post cleaning of the threads, suck it out?

    Petrol is even less dense than water, anything would just sink. And it would get into the crankcase I'd think. But I like your thinking!!


  • #40
    LollipopJimmy
    Registered Users Posts: 5,429 ✭✭✭LollipopJimmy


    MrCostington wrote: »
    The cost would be the hours involved. I'd have to get a pro to to it. I've been looking at your videos with envy (your workshop, and skill of course), I'm doing this on the roadside.

    Paying for it to be done would be a whopper bill alright.


  • #41
    LollipopJimmy
    Registered Users Posts: 5,429 ✭✭✭LollipopJimmy


    Lads, I've cracked it

    https://youtu.be/ccf83w0EvK4


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  • #42
    MrCostington
    Registered Users Posts: 1,241 ✭✭✭MrCostington


    LollipopJimmy wrote: »
    Lads, I've cracked it

    https://youtu.be/ccf83w0EvK4

    LOL but I'm way ahead of you. I call it Johnny

    vac.jpg


  • #43
    MrCostington
    Registered Users Posts: 1,241 ✭✭✭MrCostington


    kadman wrote: »
    Youtube proper use of reverse chasers before you start.

    Here you go, just got it today, not tried it yet.

    https://www.youtube.com/watch?v=_ThApomlQwY


    This is the MS003 Sealey reverse action spark plug chaser for repairing crossed spark plug threads in your cylinder head. This is for a 14mm plug with 1.25mm thread pitch. I confirmed this by emailing Sealey directly, they were very helpful. I guess they do other sizes. And I checked this is what I needed by looking up the spec for the plug.

    Only Irish stockists is VinnyByrne.com and it's about €34

    Make sure piston is not at TDC to allow room for it.


  • #44
    kadman
    Moderators, Home & Garden Moderators Posts: 5,052 Mod ✭✭✭✭kadman


    MrCostington wrote: »
    Here you go, just got it today, not tried it yet.

    https://www.youtube.com/watch?v=_ThApomlQwY


    This is the MS003 Sealey reverse action spark plug chaser for repairing crossed spark plug threads in your cylinder head. This is for a 14mm plug with 1.25mm thread pitch. I confirmed this by emailing Sealey directly, they were very helpful. I guess they do other sizes. And I checked this is what I needed by looking up the spec for the plug.

    Only Irish stockists is VinnyByrne.com and it's about €34

    Make sure piston is not at TDC to allow room for it.

    Thats a nice bit of kit. I hope I never need one:D

    I assume the recommendation is to put a small bit of grease on it to catch the swarf, and clean it on each chase out of the plug hole. No point in reversing it up the plug hole, cutting swarf, and then winding the swarf back into the plug hole.

    Looks good, good luck on your endeavors:).


  • #45
    MrCostington
    Registered Users Posts: 1,241 ✭✭✭MrCostington


    Job done! It was a nerve-racking job to make sure I did it right and not make it worse. I need a drink and lie down after it!!

    I did not use the rag in the end, it looked to be a very tight fit, so I decided against it, would use my vacuum after.

    I applied some grease to the end of the tool before inserting, There is actually very little clearance to get it in. At first, could not get what seemed like the right thread. I thought I was going to end up damaging the bottom of the thread too. So I took it very easy and gently to find the natural thread. After a few tries it became smooth as expected. I assume I just had to overcome some carbon deposits at the start.

    Once I got a few turns in I dropped some 3 in 1 oil into the thread (forgot to get cutting oil) and very gently unscrewed the tool. When I found it getting too hard, I reversed my ratchet and went in a turn, before resuming the cutting/cleaning.

    Once done, cleaning the tool revealed a fair amount of metal in with the grease. I cleaned the tool and the head and inspected the thread with my endoscope camera and saw some metal residue. I used the tool a second time, mostly able to just use fingers to unscrew, and inspected the thread again, much better.

    I then inspected the top of the piston and cylinder wall, all clean so I put the plug in and started it up.

    Thanks everyone (especially kadman) for all your help.


  • #46
    MrCostington
    Registered Users Posts: 1,241 ✭✭✭MrCostington


    kadman wrote: »
    I assume the recommendation is to put a small bit of grease on it to catch the swarf, and clean it on each chase out of the plug hole. No point in reversing it up the plug hole, cutting swarf, and then winding the swarf back into the plug hole.

    That's exactly what I did. It's a one direction operation. Although I used it a second time, that was just to catch some swarf, no cutting was done.


  • #47
    kadman
    Moderators, Home & Garden Moderators Posts: 5,052 Mod ✭✭✭✭kadman


    Thats a great result, I knew you could do it.

    Well done.:cool::cool:


  • #48
    MrCostington
    Registered Users Posts: 1,241 ✭✭✭MrCostington


    Thanks! You have more faith in me than I do! Anyway, a lesson learned!

    I left you a little thank you in the today I saw a classic thread :)


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