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  #1  
Old 09-14-2025, 03:22 PM
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Radiator Drain Plug Thread Pitch
My radiator drain plug broke off the head (06 e53 m54). It'll take days to get a replacement, nobody around here stocks it and I can't be without a car.

Does anyone know what the thread pitch is on these stupid things so I can grab a bolt and an O-ring to tide me over until the new one comes in?

Thanks!
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Old 09-14-2025, 03:25 PM
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Radiator Drain Plug Thread Pitch
Do you have the broken one to take with to hardware store?

If you take a photo with a penny next to it i can get you a thread pitch using Photoshop.

A penny is exactly .7500 inches makes a perfect reference

Place broken piece next to penny take from a distance with zoom to reduce parallax. Been using this method over a decade to find out things like exact size of a DC power plug to the 1/10 mm

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Old 09-14-2025, 03:27 PM
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Right now the car is cooling off before I can extract the thread of the old one.

The head didn't have enough thread on it to tell unfortunately. And now it's somewhere in the road lol.
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Old 09-14-2025, 03:29 PM
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When car is cooled extract broken and get a photo i can measure for you. Do you have a calipers to measure the diameter? (I can get that also but never hurts to have confirmation)


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Old 09-14-2025, 11:59 PM
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Quote:
Originally Posted by Mike1261 View Post
My radiator drain plug broke off the head (06 e53 m54). It'll take days to get a replacement, nobody around here stocks it and I can't be without a car.



Does anyone know what the thread pitch is on these stupid things so I can grab a bolt and an O-ring to tide me over until the new one comes in?



Thanks!
As someone who used to work in a radiator shop, call around and see if they have any replacement tanks to put on the header plate. If the core is still good you'd be looking at 20 minutes of work (not counting removal & reinstall) and pretty cheap prices too...

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Old 09-15-2025, 07:21 PM
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If you don't have any leak, leave the broken plug alone.

https://xoutpost.com/bmw-sav-forums/...rain-plug.html
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Old 09-17-2025, 11:30 PM
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Originally Posted by cn90 View Post
If you don't have any leak, leave the broken plug alone.

https://xoutpost.com/bmw-sav-forums/...rain-plug.html
+1 on that. No leak now, it's unlikely it will leak before you get a replacement.
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Old 09-18-2025, 11:41 PM
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