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Old 10-07-2002, 09:31 PM
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19mm Coolant Drain Plug

I have a question about the 19mm coolant drain plug on the side of the M103 block. It appears that it's possible to attach a hose to this plug. Can someone explain how this plug works before I get around to flushing the cooling system?


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Old 10-07-2002, 09:52 PM
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Join Date: Sep 1999
Location: Miami, FL
Posts: 645
I suppose you should turn it until it begins to leak, then put a hose on it.

I had to use a 19mm deep socket with a pipe on the end. I just let it leak out on the ground. As I put a pint of water pump lube/ antifreeze restorer in mine on a yarly basis, the fluid was entirely clear, rust free and clean-looking after three years.

You will need to really tighten it. Mine leaked a bit after the engine heated up a bit. I'd start the engine with the car still on a jackstand, and make sure it was not leaking.

Hope this helps.

There is a place where you can put a tube on the radiator drain as well.
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Old 10-07-2002, 10:46 PM
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Thanks Richard,
I've been draining as much as I can get out by putting a modified clothes washer hose on the spigot at the bottom of the radiator but I was thinking of flushing the system and so I need to get it all out.

I've been refreshing as much coolant as I can out on a yearly basis so I may not really need to do anything more unless I start to have problems.

I have to drain the system in my garage so that's why I was asking about the19mm drain plug.

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Old 10-08-2002, 11:47 AM
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Join Date: Jun 2001
Location: California
Posts: 327
I put the front of my car up slightly on jack stands and caught the coolant in my 2 gal car wash bucket. I didn't attach anything to the plug and I barely spilled any. I used a 1/2 inch drive ratchet, medium extension and a short 19mm. It fit perfectly. Draining the block is simple and worth the trouble.


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