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Old 22 October 2008, 09:40   #11
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Looks like you can get away with just tapping the hole ( if you dont need to get a stud out by drilling, & even then if you do it carefully you may get away without drilling it out) for a helicoil, but looking at the timesert details I cant work out what the advantage of one over the other is.

Helicoils seem to have worked for years, and the timesert seems to be a slighlty differant way of doing the same thing ( unless I am missing something )
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Old 22 October 2008, 10:01   #12
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Looks like you can get away with just tapping the hole ( if you dont need to get a stud out by drilling, & even then if you do it carefully you may get away without drilling it out) for a helicoil, but looking at the timesert details I cant work out what the advantage of one over the other is.

Helicoils seem to have worked for years, and the timesert seems to be a slighlty differant way of doing the same thing ( unless I am missing something )
If it's too badly damaged to get a helicoil in there (for example a drill slipped while drilling out, or the helicoil won't stay in)then the timesert allows you to take it out further.
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Old 22 October 2008, 13:30   #13
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If it's too badly damaged to get a helicoil in there (for example a drill slipped while drilling out, or the helicoil won't stay in)then the timesert allows you to take it out further.
I use Timeserts over helicoils every time. Much easier to fit and much stronger. Techs at the local Mercedes dealership keep breaking the glow plugs off and its a 2 day job to remove and refit the head. So they send it to me and I drill and fit a timesert. I don't use grease to hold the swarf as you cant get it back out the hole (its an M8 fine), just keep it dry and blow it out with an airline. I make sure theyre aware of the risk and pass on responsibility to them, so far none have come back smoking and rattling
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Old 22 October 2008, 17:13   #14
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I use Timeserts over helicoils every time. Much easier to fit and much stronger. Techs at the local Mercedes dealership keep breaking the glow plugs off and its a 2 day job to remove and refit the head. So they send it to me and I drill and fit a timesert. I don't use grease to hold the swarf as you cant get it back out the hole (its an M8 fine), just keep it dry and blow it out with an airline. I make sure theyre aware of the risk and pass on responsibility to them, so far none have come back smoking and rattling
On the opposite tack, I've has a timesert come out on a couple of occasions because it's rusted to the exhaust studs on a bike and salt from the roads has ingressed and has destroyed the timesert outer thread(hence saying grease the outside to prevent water ingress). I'd always use a helicoil first-it means there's still the option of a timesert,whereas the timesert is the last option.
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Old 22 October 2008, 17:42   #15
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You could use a thread chaser tool to see if you can clean up the thread - basically it is a large tap to recut the exsisting thread.

http://www.frost.co.uk/item_Detail.a...on&subCatID=27

Much easier if the thread isn't too badly damaged.
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Old 22 October 2008, 17:51   #16
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You could use a thread chaser tool to see if you can clean up the thread - basically it is a large tap to recut the exsisting thread.

http://www.frost.co.uk/item_Detail.a...on&subCatID=27

Much easier if the thread isn't too badly damaged.

You can make one with an old spark plug if you're handy. I made one a while back that's got no central electrode but a bit of hose sticking out so I can attach it to a 12v vacuum cleaner(via a shedload of gaff tape)to suck up any swarf.
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Old 23 October 2008, 04:17   #17
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Helicoilopti

Hi,if the head off is the preferred route it would be worth helicoiling the rest of the plug holes,they used to run out at @ 6 each.Cheers
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Old 23 October 2008, 05:43   #18
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Thanks for all the advice . Have just been up to the boat & its all done , fixed , serviced , winterised , lifted , covered ,the lot now.

In the end it was deemed a head off & helicoil job. All the other plug threads were OK & the plugs could be screwed in by hand ( until the end ) . Am pleased they fitted the coil , as , as was said it means if it fails I can then go down the timesert route.

Now I'm just waiting for the bill ! So 110 for plugs , etc etc - I just wont tell the wife - and thats before the lift / wash / store !

Still on a plus side I have fitted my ebay cover properly for the first time & people thought its was a full on tailored cover ! A bit long at the back , but needed the length to get the width to cover the cabin. A few quick cuts with the knife & hey presto - now runs just over theback of the motor , which should stop the rain collecting on top & allow a bit of airflow ! Roll on Spring !
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Old 25 October 2008, 17:29   #19
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Good stuff .. Just for the record chaps didnt see this thread till now,.. I've used helicoils to good effect. On an alloy head I assumed any swarf that I couldnt recover would just get burned or blown out as it is fine stuff, and light, and would'nt really cause that much damage for all the tiny amount that would have been left, any one found this to be different ?
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Old 25 October 2008, 19:08   #20
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110 for plugs , spark plugs surely not .

I know dealers take the P**s but
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