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[Andy H]

Is it a left hand thread?

The sump is off - I have tried heat and holding what is left of the head in a vice but I just cannot shift it 

[Webby the Bear]

No, normal thread 

[Andy H]

Thanks Webby.

Going to take a drill to it then (if it was LHT I would weld a nut to it to try to save it)

[biggriffin]

Std m8x1.50x 20.
Looks like you be drilling it out and re tapping 

[Webby the Bear]

Wonder why it's on so tight 

I've always wondered about drilling a hole and putting a drain plug in also....as I've never had the pan off do you think that's possible Andy?

[Andy H]

I am hoping that once the head drops off the thread will be OK.

Peed off because I am wasting my time on something that shouldn't be a problem 

[Andy H]

Wonder why it's on so tight 

I've always wondered about drilling a hole and putting a drain plug in also....as I've never had the pan off do you think that's possible Andy?

I think corrosion has got under the head of the plug and glued it in place.

I wondered about adding a drain plug but it is the first time this box has has been touched in 200,000 miles and I don't expect to do it again on this car.

Last time it was discussed on the forum the consensus was that adding a drain plug wasn't worth the effort as dropping the sumps allows you to see any bits of thrust-washer that might not be evident if you used a drain plug.

[JamesV6CDX]

Yep no need for a drain plug, the method I learnt from sassanach is much more effective and quick albeit more expensive

Ref the stuck plug, will it not budge with a socket that drives the flat edges, and a sensible breaker bar? They are often v stuff but drilling it seems extreme

[Andy H]

The plug seems to be made of cheese. I had rounded the corners off long before applying any serious force

I have since held the bolt head in an engineering vice and applied some serious force without result. I will try filing some new flats for one last attempt. wish me luck

[Shackeng]

I've got a spare AR25 box here going begging. Although IIRC the sumps are the same on both auto boxes.

[Andy H]

Std m8x1.50x 20.
Looks like you be drilling it out and re tapping 

Mine is M12.
Ground the head down until it was 2 or 3mm thick then drilled through the plug in stages until I had got to 10mm. After that I was able to unscrew the plug with my fingers.

[Webby the Bear]

Fair comment about the mileage in comparison with the life of the car.

Personally though if i could physically fit a drain plug I would. Just like the idea of quick ATF changes 

[Nick W]

Personally though if i could physically fit a drain plug I would. Just like the idea of quick ATF changes 

It's not the drain plug that slows the ATF change, but the awkward procedure for refilling the bloody thing. Doing away with dipsticks is a truly stupid idea, and it's now spreading to engines.

[chrisgixer]

Tried some heat on the sump surrounding the nut?

[Andy H]

Tried some heat on the sump surrounding the nut?

One of the first things I tried.