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Join Date: Jan 2005
Location: NC
Posts: 17
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Cross Thread
Hey all,
I'm pretty sure I cross threaded my spark plugs today- on #4 and #5. At least I couldn't get them to tighten up enough to "get all the way down" so the spark plug wires seat properly. So, given that, what do I do? Is it expensive  Thanks, Ged
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Ged 1974 911 S Targa |
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04-30-2005, 06:20 PM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,122
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well...the worse thing that can happen is you have to pull that head,,but b4 that I would buy a thread chaser kit from Nappa and se if that works.I think there is even a insert repair you can do........now if this is a high end eng. you might just want to fix it right and skip the cheap tricks.
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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04-30-2005, 06:25 PM
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Registered
Join Date: Jan 2005
Location: NC
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BTW, I'm an engineer, so I'm a double idiot!!
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Ged 1974 911 S Targa |
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04-30-2005, 06:25 PM
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Join Date: Oct 2001
Location: San Carlos, CA US
Posts: 5,536
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To fix it right, you have to pull the head, drill, and put in an insert, not a coil thingy.
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Porsche 2005 GT3, 2006 997S with bore-scoring Exotic: Ferrari F360F1 TDF, Ferrari 328 GTS Disposable Car: BMW 530xiT, 2008 Mini Cooper S Two-wheel art: Ducati 907IE, Ducati 851 |
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04-30-2005, 09:01 PM
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Join Date: Jan 2003
Location: Dallas Texas USA
Posts: 486
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gedk,
I am a little confused by you saying: "couldn't get them to tighten up enough to 'get all the way down' so the spark plug wires seat properly." If they are cross threaded they would be at an angle, and this could possibly cause interference with the spark plug boots. Are you saying that they just kept turning and wouldn't tighten up? Like over torqued and stripped, as opposed to cross threaded? I guess that would be possible if you REALLY over tightened them...? Have you removed the plugs and looked at them to see if there is any evidence of stripped aluminum threads? It is my experience that you would have to be EXTREMELY unlucky to cross thread a plug on a 911 engine.... There is so little room between the spark plug wrench and the head cooling fins that I don't see how you could get the wrench at enough of an angle to cross thread the plug.
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Paul 2001 CLK55 AMG, 1987 911 Turbo Look, 1997 Viper GTS. |
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04-30-2005, 09:28 PM
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Join Date: Jan 2005
Location: NC
Posts: 17
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It seems to be at a slight angle. The threads seem to be ok, oddly enough.
The plug is about a 1/4" higher than the others. In other words, it sticks out of the head more. Make any sense?
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Ged 1974 911 S Targa |
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05-01-2005, 04:29 PM
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