I have a 85 2.8 mfi and I need to clean the threads were the O2 sensor goes into the exhaust pipe. Does anybody know what size tap I can chase the threads with? Someone said it may be a 3/4-16 unc, but I want to be sure.

Thanks

 

no idea, but do make sure you put some anti-sieze on the O2 sensor threads when you put it back in

 

It is a an 18mm thread. Same as the larger size spark plug. Can use a spark plug thread chasing tool. To be found at auto supply stores.

RBob.

 

Thank you very much for the info.