ok whats going on i went to put a pipe plug in the threaded hole for the 02 sensor in the exhaust manifold and only a 3/8" will fit but its just a hair too lose to work

what size is this hole ?? what plug do i need

thanks

 

18mm!

 

An 18mm X 1.5 oil drain plug works very well.

 

ok so 18mm x 1.5 is it ?

thats all i need ot know as far as the size and thread goes ?

thanks!

 

18mm diameter, 1.5mm thread pitch. You can use a 30mm long bolt say...

I didn't know where i'd find an 18mm bolt, I guess I can (we can) use an oil drain pan bolt! What vehicles would have an 18mm bolt for the drain pan?
I want set up the mounting for this while the y-pipe is easy to get to, but not have the O2 sensor in while breaking in the new motor... cool!

 

Use an old spark plug.

 

damn! good one!
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wait, I had a few spark plugs on my computer desk, and the 18mm nut i'm going to weld onto my y-pipe at my feet here... The plugs are 14mm thread aren't they? They're way small. Or do you mean plugs for a different vehicle?

 

If that's too ugly for you, try a Dynomax 35299.

 

not ugly, just REAL hard to thread an M14 thread into an M18 hole...

 

Why would you do that instead of using an M18 spark plug?

 

genius! got a part#?

 

No, but check your lawnmower.

 

Motormite part number 65220. Oil plug availible at O'Reilly's and Autozone for about $2.50. I used one of these when I removed an O2 from one of my cars.

 

ttt