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Thread: ARGHHHHHHH.....So close but now so far!

  1. #1
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    Default ARGHHHHHHH.....So close but now so far!

    Ok, so I went to start the engine for the first time with the fan attached and the engine wouldnt start....



    Checked everything and then noticed that one of the plugs was loose, so I tightnened it up...and it simply wont tighten...



    I guess the thread is stripped...



    What on earth do I do? (Apprt from cry and tear my hair out!)



    I guess I can get a heli-coil kit from Namrick, but does this mean I have to strip my head off?



    Im so dam annoyed with myself now...ARGHHHH!!!

    Dunc

  2. #2
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    Default Re: ARGHHHHHHH.....So close but now so far!

    That's incredibly bad luck. You better get your spanners out, the head needs to come off. It's a pushrod engine (right?) so it shouldn't be too bad a job - no camshaft to fiddle about with. So long as it can be done with the engine in the craft?



    Think yourself lucky - I've still got an incomplete hull! (still, it's looking like a hovercraft now, the hull's about 80% there)



    Ian




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    Default Re: ARGHHHHHHH.....So close but now so far!

    It is a pushrod engine....



    Do you recon its worth paying someone to do the rethread or just get the kit and do it myself? (I can think of several places locally who could proberably get it done...just depends how much)



    Should I get both heads off at the same time so that the lifters are all adjusted at the same time and the heads/valves inspected or does it not really matter?



    Do I need new gaskets?



    To be honest with you Ian, I just want to get hovering now, I have been working on the hover for over a year now and its getting on my tits Even if I am going to miss the challenges when its done



    Dunc

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    Default Re: ARGHHHHHHH.....So close but now so far!

    Bad luck Dunc,



    First the bad news - one stripped plug won't stop this engine starting (I've had one of mine run OK on just two cylinders - idle a bit rough tho!). These engines are pretty good starters - if you have fuel and a spark they will run.



    If you are desperate to avoid stripping the head to fix the plug thread then you could try bonding a new plug in using bearing retainer (green coloured Loctite). It will be very difficult/impossible to remove the plug again but you should get at least 2-3 years out of it.



    Suggestion #2 - fill the cylinder with expanding PU foam then tap and re-thread the plug hole. Vacuum out big aluminium particles from the plug hole then break up the foam using a bit of wire and it will all be burnt and ejected out the exhaust port (complete with any remaining bits of metal).



    If you do remove the head then you will need a new head gasket and a probably a valve cover gasket. It may also be worth replacing the valve stem oil seals while you are in there. You don't need to touch the other head.


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    Default Re: ARGHHHHHHH.....So close but now so far!

    Are you sure its a pushrod engine???



    I thought they were ohc, i know mine is..



    if you have access to the engine, you should be able to fit a helicoil yourself, the tang that you break off, will be retained in the pliers jaws,,



    another alternate method if your going to go head off, is to just get a replacement head from a sc**ppy, might be cheaper in the long run



    Mart

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    Default Re: ARGHHHHHHH.....So close but now so far!

    You don't need to remove the head to fit a heli coil, I used to do them at work on engines back when we had a apprentise and that was the benefit of using heli coils, to do them in place. Just got to pay attention to making sure you don't get metal filings left in the bore. Putting a smear of grease on the tap etc will help to grab excess filings and prevent them from making their way into places they shouldn't.



    Mart - Duncans EA81 is the pushrod engine with the blue rocker covers , my EA82 is the OHC motor with the alu covers and cambelt.

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    Default Re: ARGHHHHHHH.....So close but now so far!

    I have a suggestion..



    If you go with the idea of making the helicoil with the head still in place you could try to blow compressed air through the exhaust port on the head while the exhaust valve is open.

    This would probably blow most of the metal pieces out of the plug hole while you drill and make the threads for the helicoil.



    Philip

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    Default Re: ARGHHHHHHH.....So close but now so far!

    Off with it's head i say !!



    you can blow as much compressed air through the exh port and smear as much grease on the tap as you like but you'll rue the day you did not take the head off when the lot lets go



    i never thought i'd ever quote my dad but here goes



    "cleanliness IS godliness when it comes to engines"



    "don't spoil the ship for a ha'peth of tar"



    good luck - you're not the first and you'll certainly not be the last or else why was the helicoil invented ?



    Tony

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