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Unread 08-04-2012, 05:29 PM   #1
Hamid
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Coolant engine drain plug

On 2000 XJ I-6, 4.0L
Anyone tried to loosen the coolant system engine block drain plug on the driver side of the engine, exactly below the intake manifold.

it is a pain, looks like it can be reached with an extension, the plug is a square fit, don't know if there is a tool fits there and what size, I appreciate you all help.

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Unread 08-04-2012, 05:33 PM   #2
Diamond-x
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There's no reason too, unless your boiling the block.
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Unread 08-05-2012, 09:14 AM   #3
Weebur
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Quote:
Originally Posted by Hamid View Post
On 2000 XJ I-6, 4.0L
Anyone tried to loosen the coolant system engine block drain plug on the driver side of the engine, exactly below the intake manifold.

it is a pain, looks like it can be reached with an extension, the plug is a square fit, don't know if there is a tool fits there and what size, I appreciate you all help.
Most square holes in drain plugs are the size of 3/8" extension ends or the 3/8" ratchet. The plugs are pipe threads (tapered), so clean them up good on a wire wheel/brush and wrap a couple windings of Teflon tape on the threads and don't over tighten.
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Unread 08-05-2012, 01:49 PM   #4
1990JEEPXJ
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Quote:
Originally Posted by Diamond-x
There's no reason too, unless your boiling the block.
Because completely draining the cooling system that way is somehow a bad idea? It's fast, effective, and easy. I prefer using the block drain plug when doing a full flush
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Unread 08-05-2012, 04:18 PM   #5
Diamond-x
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Originally Posted by 1990JEEPXJ View Post
Because completely draining the cooling system that way is somehow a bad idea? It's fast, effective, and easy. I prefer using the block drain plug when doing a full flush
No, it's a great idea. The op is complaining that he can't get the plug out.
Just use the radiator hose connections and save yourself a lot of trouble.
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Unread 08-06-2012, 03:17 AM   #6
Hamid
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Really some of you didn't realize what I meant.

I need to remove the plug to drain the cooling sys as mentioned in the scheduled maintenance in the owners manual, that's all.

Anyone did removed that plug in order to flush the cooling sys?.

Thanks for sharing your experience.
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Unread 08-06-2012, 06:14 AM   #7
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Quote:
Originally Posted by Weebur View Post
Most square holes in drain plugs are the size of 3/8" extension ends or the 3/8" ratchet. The plugs are pipe threads (tapered), so clean them up good on a wire wheel/brush and wrap a couple windings of Teflon tape on the threads and don't over tighten.
Actually the ones I've removed have been 5/16" square drive. Ain't that special?
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Unread 08-06-2012, 06:18 AM   #8
5-90
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Quote:
Originally Posted by Hamid View Post
On 2000 XJ I-6, 4.0L
Anyone tried to loosen the coolant system engine block drain plug on the driver side of the engine, exactly below the intake manifold.

it is a pain, looks like it can be reached with an extension, the plug is a square fit, don't know if there is a tool fits there and what size, I appreciate you all help.
The early plugs are an 8m/m square drive, which is also just about the same as 5/16". A tool may be readily made from a 5/16" or 8m/m hex key, using only a grinder, and done in about five minutes. (Had to do this for my BA-10/5 transmissions. It's easy.)

Later plugs may take a 3/8" square drive, simplifying the process.

I am unsure if they used a standard tapered pipe thread for this - if they did, it's probably 3/8"NPT or 1/2"NPT, and a replacement plug may be gotten at any hardware store. I'd recommend brass for a replacement - it won't seize.

I'm considering putting a small, cable-operated valve in that port when I overhaul my engine, to simplify thorough drainage of the coolant. Pulling the lower hose doesn't get all of it, you'll have some crud left. Even pulling the plug doesn't get all of it, but it will get a lot more.
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