Does anyone know the allen tool size for the 5.4l engine block coolant drain plugs? It seems to be between my 7mm and 8mm. I'll go buy a 5/16" and try it, but it seems so close to the 8mm (7.9375mm), I think it will be too big also. 1/4" would be too small (6.35mm). Is there a such thing as a 7.5mm allen tool?

 

Yeah, 5/16 hex was too big and I think 9/32 would be too small. I was able to use a T-50 torx bit to do the job. I am still curious what the correct tool is. There is about 2.5 quarts that drain out of the block after the radiator is drained.

 

I just did mine, yea, I just skipped the coolant in the engine block. Look real tough to get to one so I convinced myself that there wasn't that much coolant in there anyways...etc. etc.....

 

Would one of you guys mind posting pics of the plug locations for me? I could probably stand to flush mine and Id like to make sure I know what Im looking for.

 

The plug I found was on the driver's side just below the rear freeze plug. It is maybe a 3/8" pipe thread plug maybe two inches above the oil pan. My Haynes manual has a good photo. It was real easy to get to on my 2wd, maybe the 4wd are harder. The T50 Torx was the only tool I could get to fit, even though it is obviously a hex fitting. There might be one on the passenger side behind the starter, but I could not feel one behind the starter. Make sure to recycle the toxic coolant at a Pep Boys, a lube place or similar. Sorry no photo.

 

Ive got the manual as well...didnt even occur to me to check it. Thanks!