A new problem--blowby near GP

[icanfixall]

If the threads are flattened near the bottom then maybe you have some carbon built up on them. This is the tap thread type and size. Its metric at M10x1 In the SAE numbers its SAE J5480. If you look at a glow plug you will see a bevel seat below the threads. Thats what seals the glow plug in the head. Not the threads. They just exert pressure on the seat area for the sealing effect. Get a tap, cut the bottom off so its cutting threads all the way at the bottom and spear really heavy axle grease on the tap flutes. That way nothing will escape into the precup. Even if it did it would be very small and blow out easily.

 

[Diesel JD]

I was hoping you'd respond to this since I know you know what you're talking about. That's what I would have been inclined to do, but then I didn't want to tell you to do that when I didn't know what the consequences would be if some of the shavings fell in.

 

[Michael Fowler]

Thats why I love this board!
I was hoping the observation that the threads were slightly flattened would be the clue that "someone" would need to identify the solution.

My only question at this time--What is the proper way to cut off the end of a tap? I would expect grinding it, and consdier the loss of hardness a minor thing as we are not really cutting threads, butcutting carbon.

 

[subway]

i have done the grease drill and tap methode to remove a broken off spark plug from an aluminum head. take it slow so the grease can catch the shavings and pull it out to put new grease on contsantly. i only went a few turns or so at a time. when i was done i started the engine for a few seconds with the plug out to try to blow any shavings out.

i would grind the end of the tap off unless you can get a hold of a bottom or plug tap that will already be threaded to the end. just cool the tap off with water in between grinding to keep it from heating up to much and it shouldent change any of the properties of the case hardening. like you said it is just cleaning the threads any way.

 

[icanfixall]

Grinding a tap is easy. Just grind for about 10 seconds and cool it. Don't let it turn blue. Thats too hot and the hardness will be hurt. Also if you pull the injector you can force air into that hole and all the carbon and crap will blow up out of the glow plug... But wear a face shield and goggles. No sence getting anything in your 2 good eyes. We only have 2 to last a lifetime. Also if you use air you don'r need the grease.... Glad to help out and keep the money in your pockets.