Oil pan Plug thread size

[North Idaho Wolfman]

Aside from the 1/4" BSPP I suggested, it may be ISO 6149 Metric Straight Thread M14x1.5. What was the drive size measured at?

View attachment 123891

Thread Identification - Checkfluid

www.checkfluid.com

View attachment 123890

He said he tried a 14mm and it didn't fit.

 

[85Hokie]

curious, google .536 bolts... this popped up

https://www.napaonline.com/en/p/NOE6411578

so 1/2" fine thread bolt ?

makes sense, fine threaded.

Notice the Knurl is that size - not the threads.

 

[Dustball]

ANYWAY - took the plug off and stuck the new .500 Fumoto plug in - goes in and does not even touch the threads! Big wtf moment!

I measured the major diameter and the minor - here are those numbers .536" Major -carefully measuring the OD of the thread and then measuring the minor diameter of the threads I got .492"

When you said .500 Fumoto, this means 1/2-20 Fumoto valve? That should not have dropped in if you measured the plug that came out at .536". Perhaps the Fumoto valve was the wrong size?

 

[85Hokie]

I wished I had taken a damn picture!!!

 

[85Hokie]

When you said .500 Fumoto, this means 1/2-20 Fumoto valve? That should not have dropped in if you measured the plug that came out at .536". Perhaps the Fumoto valve was the wrong size?

No, cause I have the exact valve - it was spot on. Something is just fishy - but hell,
I can't see it from my house!

 

[Dustball]

No, cause I have the exact valve - it was spot on. Something is just fishy - but hell,
I can't see it from my house!

Is F-106 the valve part number that you tried using?

 

[North Idaho Wolfman]

When you said .500 Fumoto, this means 1/2-20 Fumoto valve? That should not have dropped in if you measured the plug that came out at .536". Perhaps the Fumoto valve was the wrong size?

Why wouldn't a 1/2" threaded valve not fit into a ~9/16 hole?

 

[Dustball]

Why wouldn't a 1/2" threaded valve not fit into a ~9/16 hole?

I had my sizes reversed when I said that. Regardless of what happens, there's not going to be a Fumoto valve that will fit the existing hole size unless it's re-tapped.

 

[85Hokie]

Why wouldn't a 1/2" threaded valve not fit into a ~9/16 hole?

here is the valve :

so the major diameter of the 1/2 -20 is damn close to .500 - the bolt that came out of the pan had an OD of .536 - so that .500 Fumoto went it without a twist!

 

[North Idaho Wolfman]

Sounds like it's FUBAR to me!

 

[GrizBota]

At this point you’ll need that plug in your hand to figure it out. Or just leave it as is.

 

[85Hokie]

At this point you’ll need that plug in your hand to figure it out. Or just leave it as is.

I'm gonna hope I never see that freaking plug again - I didn't take it out nor place it back in - but I did make sure it was snug and a bit more.

 

[lynnmor]

It sounds like the drain plug was an oversized or double oversized repair plug that was installed by a previous mechanic. Yes, they make drain plugs to fix oil drains that were damaged by excessive tightening.