Blew another spark plug!
- Thread starter 1999norcalgt
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CanadaStang
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Usually the cause of this is:
a) changing plugs when engine is hot
b) tightening plugs too tight and damaging the threads
c) not tightening plugs enough and having them back out and blow out when there are only a few threads holding the plug in
d) not using anti-seize, and the threads are damaged upon removal
If you can fix it with a heli-coil do this to the others.Wait till engines cools, remove the plug caps and spray down the holes with wd-40, let it soak over night. Remove the plugs and coat them with anti-seize and reinstall using a torque wrench to 10-12 ft lbs
a) changing plugs when engine is hot
b) tightening plugs too tight and damaging the threads
c) not tightening plugs enough and having them back out and blow out when there are only a few threads holding the plug in
d) not using anti-seize, and the threads are damaged upon removal
If you can fix it with a heli-coil do this to the others.Wait till engines cools, remove the plug caps and spray down the holes with wd-40, let it soak over night. Remove the plugs and coat them with anti-seize and reinstall using a torque wrench to 10-12 ft lbs
15815
Do not repair spark plug port threads in aluminum cylinder heads-
Unapproved usage of helicoil for serice
Some engines equipped with aluminum cylinder heads may exhibit spark plug port(s) with stripped or missing threads, "Do not" service stripped or missing spark plug port threads by using "helicoil" or "tapersert" repair kits. It is likely that additonal engine damage or engine failure will occur after an unsuccesful atttempt to service the cylinder head spark plug reports with "helicoil" or taperset. The only authorized service procedure is to replace the cylinder the cylinder head assembly when spark plug port threads are damaged is to replace the cylinder head assembly when spark plug port threads are damaged and in need of service, refer, to the pertinent workshop manual (section 303-1) for cylinder head removal and installation procedures. Note: When servicing spark plugs for any reason , do not use air or powertools and take care to ensure that spark plyugs to not crossthread.
Do not repair spark plug port threads in aluminum cylinder heads-
Unapproved usage of helicoil for serice
Some engines equipped with aluminum cylinder heads may exhibit spark plug port(s) with stripped or missing threads, "Do not" service stripped or missing spark plug port threads by using "helicoil" or "tapersert" repair kits. It is likely that additonal engine damage or engine failure will occur after an unsuccesful atttempt to service the cylinder head spark plug reports with "helicoil" or taperset. The only authorized service procedure is to replace the cylinder the cylinder head assembly when spark plug port threads are damaged is to replace the cylinder head assembly when spark plug port threads are damaged and in need of service, refer, to the pertinent workshop manual (section 303-1) for cylinder head removal and installation procedures. Note: When servicing spark plugs for any reason , do not use air or powertools and take care to ensure that spark plyugs to not crossthread.
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