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Author Topic: Engine coolant drain plug 8.1L Vortec  (Read 1109 times)

Clay L

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Engine coolant drain plug 8.1L Vortec
« on: May 07, 2009, 08:22:26 AM »
I understand there is a coolant drain plug on the drivers side of the engine. I see two brass colored pugs. One is a 17mm recessed hex - maybe an inch in diameter and the other is smaller - an 8mm recessed hex.

 Does anyone know if either of these two is the drain plug and if so which is it?
Clay (WA5NMR), Lee (Wife), Katie & Kelli (cats)
Settled down after full timing for eleven years and snowbirding for one year in a 2004 Winnebago 35N Sightseer, Workhorse W 20 Chassis. Honda toad

John Canfield

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Re: Engine coolant drain plug 8.1L Vortec
« Reply #1 on: May 12, 2009, 09:10:23 PM »
Bump - anybody have any help for Clay?
--John
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Clay L

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Re: Engine coolant drain plug 8.1L Vortec
« Reply #2 on: May 13, 2009, 08:40:26 AM »
Sorry i didn't update this. 

I found the other 8 mm recessed hex plug on the other side of the engine. Both of them are towards the rear of the engine. If you look below the two rear spark plugs on each side, they can be spotted.

I got about 5 1/2 gallons total out of the radiator and the two drains.

The 17 mm may also be a drain but since I got out what I understand to be the right amount of coolant I didn't remove it.

The coolant looked clean but after five years the additives must have been at the end of their life.

On another forum a poster explained how to open the radiator drain fitting using a 1/4 inch ratchet wrench and an extension. That was very helpful because it would be easy to damage the fitting. The square end of the extension fits into a square in the fitting. It only turns about one half turn CCW to be fully open.
Clay (WA5NMR), Lee (Wife), Katie & Kelli (cats)
Settled down after full timing for eleven years and snowbirding for one year in a 2004 Winnebago 35N Sightseer, Workhorse W 20 Chassis. Honda toad