Veraciousreasoning Posted January 20, 2022 Report Share Posted January 20, 2022 As the title suggest I cleaned my spark plugs out today and noticed that my number 2 and 3 are really rough to get in and when you do get them in they keep spinning. What would be the rethreading size I would need? Quote Link to comment
datzenmike Posted January 20, 2022 Report Share Posted January 20, 2022 Too late now but are the Champion or NGK??? Quote Link to comment
Veraciousreasoning Posted January 20, 2022 Author Report Share Posted January 20, 2022 NGK Quote Link to comment
datzenmike Posted January 21, 2022 Report Share Posted January 21, 2022 Well that a relief. Can you remove them? They are not snapped off in the holes? M14 X 1.25 I think for Nissan but if spinning in the hole it's beyond stripped. Quote Link to comment
Veraciousreasoning Posted January 21, 2022 Author Report Share Posted January 21, 2022 No they didn't snap off or anything. Just went I tightened them done to snug tight it never went snug and just kept spinning. Spun them by hand till I felt resistance and then used my socket from there. Quote Link to comment
Logical1 Posted January 21, 2022 Report Share Posted January 21, 2022 I have worked on a few heads that have been stripped and used a heli-coil to repair them. While yes I would love a true repair such as a Tig-fill and re-tap that is not always possible. I have not had any heli-coil failures to my knowledge. Heli-Coil 1 Quote Link to comment
Veraciousreasoning Posted January 21, 2022 Author Report Share Posted January 21, 2022 I was looking into Heli-coil as well. I just don't know the size of the thread I need to put in. Quote Link to comment
datzenmike Posted January 21, 2022 Report Share Posted January 21, 2022 New M14 X 1.25 plugs spin them in by hand till seated and then tighten 1/2 turn. Done. I place the plug in the socket with an extension line up and turn in by hand. Easier to estimate the entry angle to the threaded hole. Never force anything. Aluminum is soft and unforgiving. Quote Link to comment
DIY 1985 Posted January 23, 2022 Report Share Posted January 23, 2022 If you need to clean the threads, some gasoline on a q-tip held with pliers, it will wash the threads on the head. Then a spark plug will be easier to insert without a handle on a socket extension, turning by hand. Have a jar of gasoline to rinse the threads on the spark plug, and lightly brush them clean. Mop up the face where the plug gaskets seat, as soil is attracted to the oil there. I had the bad feeling of a stripped thread on my truck. So, I just lightly seated it, as the 720 was needed for doing work. Quite a bit later, the plug got loose, I noticed the gas mileage took a dive. It turned out to be crud where the face of the plug gasket sits. By this time, I had compressed air, and I spent quite a bit of time cleaning the threads and gaskets up. Now, I can torque it in just fine, after seating it without using the handle on the socket extension. If you do a HeliCoil with the head on, use axle grease to retrieve the metal chips - or so I've heard from others when I looked into it. 3 Quote Link to comment
Veraciousreasoning Posted January 24, 2022 Author Report Share Posted January 24, 2022 On 1/22/2022 at 5:55 PM, DIY 1985 said: If you need to clean the threads, some gasoline on a q-tip held with pliers, it will wash the threads on the head. Then a spark plug will be easier to insert without a handle on a socket extension, turning by hand. Have a jar of gasoline to rinse the threads on the spark plug, and lightly brush them clean. Mop up the face where the plug gaskets seat, as soil is attracted to the oil there. I had the bad feeling of a stripped thread on my truck. So, I just lightly seated it, as the 720 was needed for doing work. Quite a bit later, the plug got loose, I noticed the gas mileage took a dive. It turned out to be crud where the face of the plug gasket sits. By this time, I had compressed air, and I spent quite a bit of time cleaning the threads and gaskets up. Now, I can torque it in just fine, after seating it without using the handle on the socket extension. If you do a HeliCoil with the head on, use axle grease to retrieve the metal chips - or so I've heard from others when I looked into it. A pretty famous mechanic on youtube just turns the engine for a second with the spark plug out and it shoots right out of the hole lol 1 Quote Link to comment
dimitrisprophet Posted January 31, 2022 Report Share Posted January 31, 2022 Happened with my 96 Miata. Cyl 1 plug kept popping out so I tapped and did a helicoil. Nerve wracking but pretty easy. Bunch of metal shavings but I just left the plug out and ran it for 2 seconds with 3 cyl and it shot all the shavings out like a glitter bomb. Never had any issues with it by the time I sold it Quote Link to comment
datzenmike Posted January 31, 2022 Report Share Posted January 31, 2022 The aluminum in heads is soft enough, valves and seats are steel. Nowhere to go but out the exhaust really. Quote Link to comment
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