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Unread 01-13-2012, 08:08 AM   #1
hgoodwiniii
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Join Date: Dec 2009
Location: Houston
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Radiator Drain Plug

Hi all, appears my radiator drain plug is leaking on my 97 Grand Cherokee. The leak appears to be out of the drain hole. I bought a new plug from the dealership and I'm trying to figure out how tight to tighten it when I install it. There is a hole on the shaft that sits inside the radiator on the drain plug. Seems to me if I tighten the shaft to much and the hole on the shaft sits further inside the radiator, the radiator fluid would be free to flow out the outlet hole?

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Unread 01-13-2012, 10:23 AM   #2
Nejeep
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Join Date: Jun 2006
Location: Lincoln, NE
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Just replaced the entire radiator on the 97 last month, so I had a chance to inspect it closely. It turned out to have a leaking seam.

You thread the drain plug into the radiator till it bottoms out on the shoulder next to the hex wrench fitting. The sealing is done by the little o-ring on the internal end of the drain valve not the shoulder part. When the valve is tightened it slides the o-ring into a sleeve inside the radiator tank which prevents flow from the tank into the valve drain hole between the o-ring and threads. When you loosen the valve, the o-ring is moved out past the sleeve and it allows coolant to flow from the tank past the o-ring to the valve drain hole.

I expect these common drain valve drip problems could be solved by replacing just the o-ring, but its easier to get a complete valve assembly.
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Unread 01-14-2012, 07:21 PM   #3
hgoodwiniii
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Thanks very much Nejeep. I installed the new drain plug and leak seems to have stopped. The O-ring on the old drain plug was pretty flat so I'm assuming that had worn down.
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Unread 01-14-2012, 07:32 PM   #4
PolkaPower
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Just changed my drain plug today and a lot of smutz came out. Looks like I will be flushing it soon. It looked like the leak was coming from the plug but now I think it's below that where the corner of the rad sits. Looking for another one at the JY tomorrow and a trans cooler.
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Unread 01-14-2012, 11:50 PM   #5
KoreaZJ
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Quote:
Originally Posted by PolkaPower View Post
...and a lot of smutz came out.
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Unread 01-15-2012, 12:39 AM   #6
PolkaPower
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Quote:
Originally Posted by KoreaZJ View Post
I know I know, you'd think I was talking about a shiksa. I realized I should have not confused smutz with schmutz, which is what I meant.
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Unread 01-15-2012, 05:05 AM   #7
coralman
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Let me activate the jeep forum translator..........
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Unread 01-15-2012, 10:41 AM   #8
LouC
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Join Date: Feb 2008
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So if your shiksa is into smut, then she'd be a schmutzy shicksa eh?

BTW those cheap plastic drain plugs usually leak if you reuse them, I found that it was best to buy a new one when I changed the antifreeze.
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