Cross threaded spark plug


Information and questions on GL1200 Goldwings (1984-1987)
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PAPete
Posts: 48
Joined: Sat Apr 17, 2010 9:39 pm
Location: Kennett Square, PA
Motorcycle: 1985 GL1200-A
1982 GL1100-I

Cross threaded spark plug

Postby PAPete » Sat Sep 03, 2011 6:07 pm



I recently changed the plugs in my 85 1200 Aspy. The #3 plug was very difficult to remove -- obviously cross threaded. I was able to get the new plug in, which of course took just as much strong-arming as removing the old one. Has anyone ever inserted a helicoil or timesert in a spark plug hole? How do you ensure that you don't get metal bits into the cylinder? Thanks.


Pete
82 GL1100-I
85 GL 1200-A

gunny-usmc
Posts: 7
Joined: Sat Sep 03, 2011 6:16 am
Location: Corning, NY
Motorcycle: 1986 Honda aspencade GL1200

Re: Cross threaded spark plug

Postby gunny-usmc » Sat Sep 03, 2011 10:04 pm

I've used keencerts a lot at work. There really isn't any way to prevent the shavings from dropping into the cylinder short of inverting the engine and doing it upside down. You could try a very strong shop vac placed alongside the drill, and again when you tap the new thread but you will never know if metal got into the cylinder. You will also have to source a high temp thread sealer for the insert. Never having used on in that application, not sure what you would use, red locktite requires heat for removal but I'm betting it wouldn't hold up too well around a plug seat.

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tech1
Posts: 181
Joined: Fri Jun 18, 2010 8:21 pm
Location: East Moline IL
Motorcycle: 1986 Goldwing 1200 SE-i Aspencade
2009 audo comfort
GL1800

Re: Cross threaded spark plug

Postby tech1 » Sun Sep 04, 2011 8:52 pm

Pack grease on the tap and clean it OFTEN! I have retapped SP holes successfully. The grease catches the chips. Use a LOT of grease. fill the gaps with grease and tap a little and back out clean off the grease with chips and apply clean grease. You waste grease but this is easier then pullinng the head if you are carefull. If you don't feel comfortable check with a local machine shop if they would want to tackle it.
Good luck Joe

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PAPete
Posts: 48
Joined: Sat Apr 17, 2010 9:39 pm
Location: Kennett Square, PA
Motorcycle: 1985 GL1200-A
1982 GL1100-I

Re: Cross threaded spark plug

Postby PAPete » Mon Sep 05, 2011 12:41 am

Thank you both for your replies. Since I did manage to get a plug into the cross-threaded hole, it has been running normally, so I'll probably wait until I need to remove them again before trying anything. Is there a downside to leaving the plug in there?

Thanks again for the replies.
Pete
82 GL1100-I
85 GL 1200-A

User avatar
tech1
Posts: 181
Joined: Fri Jun 18, 2010 8:21 pm
Location: East Moline IL
Motorcycle: 1986 Goldwing 1200 SE-i Aspencade
2009 audo comfort
GL1800

Re: Cross threaded spark plug

Postby tech1 » Mon Sep 05, 2011 9:44 am

Not really the damage is done. BUT it might blow out. I have seen that. It's unavoidable you'll have to fix it sometime.
Tech1

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Mooseman
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Motorcycle: 1996 GL1500SE 86k
1986 GL1200A (SOLD) 81K
1985 GL1200A (SOLD) 85K
1986 BMW K75c 24K

Re: Cross threaded spark plug

Postby Mooseman » Mon Sep 05, 2011 2:20 pm

Plus make sure your using anti-seize compound on the plug threads.


Enjoy the ride. They are all good, just some better than others.
Mooseman


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