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Engine Block Coolant Drain?


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#1 Rocko973

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Posted 10 April 2013 - 06:44 PM

For someone doing a coolant swap, do you GM Techs NOT recommend draining the block from the two drain plugs underneath?  It's not in the GM manual, and I am wondering why it's not in their manual, because wouldn't you want to try draining as much as you can before refilling with new coolant?  And what do you think about in addtion to refilling via the reservoir per the manual, but also filling the engine block through the hose that leads into the radiator inlet tank, especially if I drained the block through the plugs?  THis would be for 2003 Silverado 1500 HD, CC.  Thank You!

 



#2 Duelin

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Posted 10 April 2013 - 07:17 PM

Sometimes when you remove those plugs it will bring the thread out of the block with the plugs.



#3 8.1HD/ALLISON

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Posted 10 April 2013 - 07:24 PM

I see no problem. Never heard of pulling threads. I would replace the o rings on them.


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#4 bossier62guy

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Posted 10 April 2013 - 07:47 PM

Didn't we cover this a week or so ago?



#5 txab

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Posted 10 April 2013 - 08:48 PM

Yep

 

http://www.gm-trucks...m-engine-block/


Edited by txab, 10 April 2013 - 08:50 PM.

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#6 Jsdirt

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Posted 10 April 2013 - 09:00 PM

I never go that crazy doing a coolant flush. I figure by the time anything builds up in there, the truck will have fallen to pieces around the engine anyway.

 

The main purpose of those plugs is to drain the block completely during an overhaul. Sucks when you flip the engine on the stand after yanking the heads, and 2 gallons of coolant pours out all over your workspace.  :lol: 


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#7 8.1HD/ALLISON

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Posted 11 April 2013 - 04:26 PM

Actually the plugs are for casting purposes.

http://en.wikipedia.org/wiki/Core_plug


backhoe6_zps0cfc8c15.jpg
You want fuel economy? Buy a Prius.... I have a big block!
------------------------------------------------------------------------------------------------------
2004 Chevy Silverado K2500 HD CCLB, 8.1L/Allison, 285/75R16 Goodyear Duratracs,
B&W hitch, Whelen 6 channel strobe lights, Soundoff Signal Mini Light Bar,
Dual Flowmaster Super 44's, BlackBear Tuned, Too much to list,


 





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