Bernie, you recently had this problem if I recall? Haven't heard Bottom tap in 40-years.
negative because you couldn't get the heli coil tap in to make the threads for the insert.. As I said earlier it's a straight thread 20mm X 1.5 (just saw the tap in my tool box this afternoon) and the thread is only about a half in deep before you reach the bottoming surface with a slightly smaller hole for the end of the sensor to protrude into the exhaust path.. without the bottoming part the sensor would just screw straight through into the exhaust pipe.. wish I had some pictures.. without the use of a milling machine and TIG welder to fab up the replacement bung with bottoming surface I would have needed to replace the DPF because of it.. Mucho cursing and swearing went on.. A quick job of replacing a NOX sensor turned into a 3 day job of DPF removal, fab new bung and then reinstall DPF... wish I'd replaced the DPF support bracket while I had it out..
wish I had a picture of a sensor.. if I understand what your saying, doing that would prevent the actual sensor part from getting into the exhaust path.. the part of the sensor that bottoms is the flat end of the sensor that is right at the sensor area itself.. when it bottoms and allows the sensor to be tightened the sensing area is about half inch into the exhaust pipe.. sorry if thats hard to follow.. pictures really help..
Repair it properly the first time and hopefully not have to do it again!
I understand, but I am not saying that you want to prevent it from getting into the exhaust, you would be creating a stop so that it doesn't go in too far. Just a suggestion, not sure it will work?
Maybe you should be generous, and give him the $8000, for a new exhaust so it's done to your satisfaction?Bottom line. Don't jury-rig or Mickey Mouse Schit.
I am proud of it too.
It says, Bobnoxious not Citibank.
