How to re-tap oxygen sensor threads?
07-08-09, 10:44 PM
#1
How to re-tap oxygen sensor threads?
Aftermarket downpipe, a couple of slightly damaged threads. Most of the threads are undamaged.
Anyone know of a good way to fix this without needing to weld in another bung? Is there a tap out there I could buy/rent/borrow for chasing them out?
Dave
Anyone know of a good way to fix this without needing to weld in another bung? Is there a tap out there I could buy/rent/borrow for chasing them out?
Dave
07-08-09, 11:31 PM
#2
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you should be able to find a tap, but it's going to be pricy. all the good taps are usually carbide or something like that and since it's big it's $$$.
my suggestion is find a SS bolt that is the same size and work that in and out a few times with some lubricant.
my suggestion is find a SS bolt that is the same size and work that in and out a few times with some lubricant.
07-09-09, 05:18 AM
#4
Negative - here is the tap you need, 18mm x 1.50 thread. Here it is at Amazon - http://www.amazon.com/1-5-High-Speed.../dp/B0006G4N7Y. It is not that much.
This is a common tap. You could simply go by your local machine shop and asked a guy there to chase your threads. Take em a dozen doughnuts.
Later
This is a common tap. You could simply go by your local machine shop and asked a guy there to chase your threads. Take em a dozen doughnuts.
Later
07-09-09, 05:23 AM
#5
I don't know what size tap you'd need...but I'm sure it is available. They are not that expensive. I think I have an old sensor laying around, I'll grab my metric T&D set and measure the threads and let you know if you like. Ace Hardware or Sears will have the largest selection of individual T&D's unless you live near a specialty tool distributor.
Sears also carries a fractional/metric thread chaser kit for $70, may have the size needed in that...can't cut threads in raw material like a T&D...but works well. A tap will cost you a quarter of that or less. Sears has a T&D metric 39 piece set (009-52383) for $100 that includes the M18 X 1.50...then you'd have just about everything you'd need for the car except for a couple 1.00 pitch T&D's...but I don't think Mazda used a lot of fine pitch threads.
Ah, Tom beat me to it...that size tap is common. Check the above sources...you can also check their on-line sites...free delivery to store if not available in store.
Another note, Helicoil (if needed) makes a repair kit for that size thread:
http://www.bollhoff-rivnut.com/en/de...r_helicoil.php
Sears also carries a fractional/metric thread chaser kit for $70, may have the size needed in that...can't cut threads in raw material like a T&D...but works well. A tap will cost you a quarter of that or less. Sears has a T&D metric 39 piece set (009-52383) for $100 that includes the M18 X 1.50...then you'd have just about everything you'd need for the car except for a couple 1.00 pitch T&D's...but I don't think Mazda used a lot of fine pitch threads.
Ah, Tom beat me to it...that size tap is common. Check the above sources...you can also check their on-line sites...free delivery to store if not available in store.
Another note, Helicoil (if needed) makes a repair kit for that size thread:
http://www.bollhoff-rivnut.com/en/de...r_helicoil.php
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