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Cbr6 spat a plug

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kramdra
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PostPosted: 12:38 - 25 Aug 2017    Post subject: Cbr6 spat a plug Reply with quote

Plug popped out on monday, took half hour of burning my hands and swearing to sort but screwed back in ok. Is it likely that the thread could be damaged either before or by the action of plug being spat out?

87k miles, they were changed 25k miles ago so were due for inspection. Other plugs were fine.
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doggone
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PostPosted: 12:43 - 25 Aug 2017    Post subject: Reply with quote

It wouldn't be likely to unscrew if it had been put in properly.
If the problem was cross threading numptiness there will be some damage but there might be enough good thread further in.
If it simply wasn't itghtened enough probably better chance of being Ok.
So, it depends.
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jaffa90
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PostPosted: 23:45 - 25 Aug 2017    Post subject: Reply with quote

they were changed 25k miles ago so were due for inspection. Other plugs were fine.
Strange but i suspect this plug/cylinder is running too hot causing more expansion and contraction.
I would check all plugs for colour after a while .
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Islander
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PostPosted: 10:20 - 26 Aug 2017    Post subject: Reply with quote

jaffa90 wrote:
they were changed 25k miles ago so were due for inspection. Other plugs were fine.
Strange but i suspect this plug/cylinder is running too hot causing more expansion and contraction.
I would check all plugs for colour after a while .


http://s2.quickmeme.com/img/d5/d52f9ca95731da7aab0b7c704df9154b32d08d4f6d87b25a848ed2df9386451e.jpg

If it went back in and tightened normally, then it was probably just loose to start with.
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Polarbear
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PostPosted: 12:49 - 26 Aug 2017    Post subject: Reply with quote

How does someone not tighten a sparkplug?

You screw it in by hand, pick up the ratchet/torque wrench and do it up!!?? Confused

Or is here some modern way of tightening that has passed me by.
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Despined_By_Ex
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PostPosted: 14:58 - 26 Aug 2017    Post subject: Reply with quote

Polarbear wrote:
How does someone not tighten a sparkplug?

You screw it in by hand, pick up the ratchet/torque wrench and do it up!!?? Confused

Or is here some modern way of tightening that has passed me by.


didnt that happen to smiler?
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Nobby the Bastard
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PostPosted: 15:15 - 26 Aug 2017    Post subject: Reply with quote

CrippleTron wrote:
Polarbear wrote:
How does someone not tighten a sparkplug?

You screw it in by hand, pick up the ratchet/torque wrench and do it up!!?? Confused

Or is here some modern way of tightening that has passed me by.


didnt that happen to smiler?


No, it was jizzbunny.
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MCN
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PostPosted: 15:25 - 26 Aug 2017    Post subject: Reply with quote

Polarbear wrote:
How does someone not tighten a sparkplug?

You screw it in by hand, pick up the ratchet/torque wrench and do it up!!?? Confused

Or is here some modern way of tightening that has passed me by.


In a Biblical sense there are a few methods to correctly tighten a plug.

e.g. New plugs and used plugs have a different method.

Plug manufacturers will provide detail.

I use this outfit for easy info.

http://www.gsparkplug.com/

And here:

https://www.ngk.com/learning-center/article/421/plug-torque-settings

I think mainly this advice helps prevent thick cnuts from stripping threads in the head. Smile

Give a man a lever.
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jaffa90
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PostPosted: 16:00 - 26 Aug 2017    Post subject: Reply with quote

Islander wrote:
jaffa90 wrote:
they were changed 25k miles ago so were due for inspection. Other plugs were fine.
Strange but i suspect this plug/cylinder is running too hot causing more expansion and contraction.
I would check all plugs for colour after a while .


http://s2.quickmeme.com/img/d5/d52f9ca95731da7aab0b7c704df9154b32d08d4f6d87b25a848ed2df9386451e.jpg

If it went back in and tightened normally, then it was probably just loose to start with.

Loose for 25k?
Marvellous.
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Islander
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PostPosted: 20:21 - 26 Aug 2017    Post subject: Reply with quote

jaffa90 wrote:

Loose for 25k?
Marvellous.


It's a lot more of a rational explanation than your bizarre hot cylinder expansion/contraction one. You might want to google Occam's razor. Laughing
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kramdra
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PostPosted: 13:23 - 27 Aug 2017    Post subject: Reply with quote

There is no cross threading. When replaced, the old ones were not tight, easy removed. I usually tighten them hand tight plus half a turn as recommended. I will check them more often.
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MCN
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PostPosted: 16:46 - 27 Aug 2017    Post subject: Reply with quote

kramdra wrote:
There is no cross threading. When replaced, the old ones were not tight, easy removed. I usually tighten them hand tight plus half a turn as recommended. I will check them more often.


'As recommended' by who?

"Without a Torque Wrench:

If a torque wrench is unavailable, finger tighten the spark plug, then use a plug wrench to tighten.

Autolite -For spark plugs with a Gasket: 1/4 turn on 10mm plugs, 3/8 turn on 12mm plugs, 1/2 turn on 14mm and 18mm plugs. 1/16 turn on plugs with a tapered seat.

Bosch - 1/4 turn on plugs with a Gasket. 1/16 turn on plugs with a tapered seat.

Champion - 3/8-5/8 turn on plugs with a Gasket. 1/16 turn on plugs with a tapered seat.

Denso - 1/4-1/2 turn on plugs with a Gasket. 1/8 turn on plugs with a tapered seat.

E3 - For spark plugs with a Gasket: 1/2 turn on 10mm plugs, 3/8-1/2 turn on 12mm plugs, 1/2-3/4 turn on 14mm plugs. 1/16 turn on plugs with a tapered seat.

NGK -1/2-2/3 turn on plugs with a Gasket. 1/12-1/8 turn on plugs with a tapered seat.

PLEASE NOTE:

Torque recommendations are for spark plugs with new gaskets.
If using anti-seize compound, use sparingly and reduce torque by 30%.
Each spark plug manufacturer has created their recommendations based on the general consensus of most engine manufactures. In the case of a discrepancy between the plug manufacturer and engine manufacturers recommendations, always default to the engine manufacturer."
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kramdra
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PostPosted: 20:46 - 27 Aug 2017    Post subject: Reply with quote

Your mum.
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MCN
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PostPosted: 01:17 - 28 Aug 2017    Post subject: Reply with quote

kramdra wrote:
Your mum.


I know that's a lie. It is either that or you are well-into necrophilia.
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kramdra
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PostPosted: 10:39 - 24 Nov 2017    Post subject: Reply with quote

She popped out again, same plug. I done it up tight as I dare but suspect the thread is fucked I could only feel two turns of engagement. Could run a tap down it..

Can plug threads be helicoiled in situ? Does head need to come off?

Thanks
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Tankie
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PostPosted: 11:47 - 24 Nov 2017    Post subject: Reply with quote

You can Helicoil with the head on , bring the piston to the top, to just before tdc.
put some grease down the hole to fill the void/combustion chamber, this will catch the swarf.
cut the insert thread, bring the piston to tdc this will force the swarf laden grease out of the plug hole, degrease the area , fit the new insert in.
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mpd72
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PostPosted: 11:51 - 24 Nov 2017    Post subject: Reply with quote

I did it once on my old 525i straight six Beemer. One plug came loose enough to make an obvious tapping noise, whilst driving home.
I tightened it and never had another plug come loose in the following 5 years and 50,000 miles or so.
Must have just forgotten to tighten it properly and it took a few thousand miles to loosen enough to be noticeable.
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fatjames
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PostPosted: 13:53 - 24 Nov 2017    Post subject: Reply with quote

kramdra wrote:
She popped out again, same plug. I done it up tight as I dare but suspect the thread is fucked I could only feel two turns of engagement. Could run a tap down it..

Can plug threads be helicoiled in situ? Does head need to come off?

Thanks


You sure it's the thread in the head rather than on the spark plug? And I know it's been 25k miles, but it's definitely the right size spark plug? A slightly smaller one might be more likely to pop out.
Be unlikely, but helpful if you could avoid having to helicoil.
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Pete.
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PostPosted: 17:57 - 24 Nov 2017    Post subject: Reply with quote

Polarbear wrote:
How does someone not tighten a sparkplug?

You screw it in by hand, pick up the ratchet/torque wrench and do it up!!?? Confused

Or is here some modern way of tightening that has passed me by.


Here's one way:

When you un-screw a plug the crap that's collected in the well falls down on to the seat. When you screw in a new plug that crap gets trapped under the gasket giving the impression that the plug is properly tight and over time could rattle out and let the plug come loose.

Either that or it wasn't tightened.
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Pete.
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PostPosted: 17:59 - 24 Nov 2017    Post subject: Reply with quote

kramdra wrote:
She popped out again, same plug. I done it up tight as I dare but suspect the thread is fucked I could only feel two turns of engagement. Could run a tap down it..

Can plug threads be helicoiled in situ? Does head need to come off?

Thanks


Piece of cake. What plug does it use? If it's a C then I have the kit to do it.
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kramdra
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PostPosted: 22:48 - 06 Dec 2017    Post subject: Reply with quote

My roadside bodge did not last and I was waiting hour and a half for RAC to collect the bike. I think the thread is now stripped and will need the helicoil. I have a bore inspection camera, will have a peak at the damage later.

Pete. wrote:
Piece of cake. What plug does it use? If it's a C then I have the kit to do it.


It is a C. I assume you are too far from West Sussex if I were able to get a van to move bike? Thanks.

Is it so easy with the thread 60mm below the rocker cover and very limited space above? Just about room for my hand and nothing else. I am unsure about doing this myself.

Is this something the average bike garage will be able to fix?
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Pete.
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PostPosted: 22:52 - 06 Dec 2017    Post subject: Reply with quote

You can do it. I sent the stuff to someone here with no mechanical aptitude and he had it done inside of half an hour.

I'll be in East Sussex all next week, otherwise send me your address and I'll post you the stuff you need.
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132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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kramdra
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PostPosted: 03:55 - 07 Dec 2017    Post subject: Reply with quote

www.youtube.com/watch?v=J7WduGDdM3E

Lots of shit down there Laughing Looks like one turn of thread left, probably longer than the plug thread so not used.
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Pete.
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PostPosted: 06:19 - 07 Dec 2017    Post subject: Reply with quote

Well exactly. anyone who has half torn out a plug thread has already dumped a load of bits in their engine but they wouldn't think twice about putting the plug in and trying again but cutting a new thread is oh noes think of the kittens.
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132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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Hong Kong Phooey
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PostPosted: 15:01 - 07 Dec 2017    Post subject: Reply with quote

Don't bother fixing it, there's thousands of Triumphs riding about on three cylinders.
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