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Old 12-18-2005, 03:06 AM   #1 (permalink)
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6.2 coolant drain plug

greetings to the wise ones of diesel technology,

Im currently in a debate as to whether or not the 6.2 diesel has an engine coolant drain plug/screw in bolt on the block like most gas motors do. If there is can anyone tell me where it is specifically or maybe even point me to a diagram somewhere? I say there is a screw in type plug but my friend says he has to knock out a plug/?!!??

Any info will be greatly appreciated.

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Old 12-18-2005, 01:17 PM   #2 (permalink)
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one on each side of block, bolt, behind motor mount.
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Old 12-18-2005, 01:29 PM   #3 (permalink)
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Originally Posted by D.Camilleri View Post
one on each side of block, bolt, behind motor mount.
that sums it up, it's pretty much impossible to get to.
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Old 12-18-2005, 07:38 PM   #4 (permalink)
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Not impossible, just difficult. GM never intended for it to be used for regular maintanance. I drain the blocks by pulling one headbolt (any one, pick an easy one to reach) and syphoning the coolant through a small, clear plastic tube. This is usually used prior to disassembling the engine for repairs.

Flushing the block for coolant maintanance can be more difficult. I wouldn't pull the motor mount bracket just to reach the drain plug. Sometimes the plug won't come out and/or breaks off in the block. Some plugs have square 1/4" recesses for using a 1/4" drive with extension to remove them. These are the ones I have found the remains of a 1/4" drive stuck in. Some plugs have an Allen style fitting, these sometimes can be coaxed out with a strong Allen socket. The ones with the square head, require a square socket to have a chance for removal.

No matter how you look at it, GM must have thought you'd never need to remove them or they would've used a 1/4" pipe thread plug with a 9/16" hex head fitting like the Olds 5.7's. Those were a piece of cake!
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Old 12-18-2005, 09:24 PM   #5 (permalink)
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thanks all. I had a feeling i was correct in my theory.

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Old 12-19-2005, 06:00 PM   #6 (permalink)
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Coolant drain

If you are just trying to get all of the anti-freeze out of the system then do as I do. I drain the radiator and then I remove the thermostat from the system, remove the heater return hose from the radiator, put a heater hose stub with a cap in it on to the radiator heater inlet, start the engine, and run the engine with a water hose putting water in the radiator to equal the amount coming out of the heater hose until the water coming out is clear.

It is just too much work to remove the engine mounts and I sure don't want to remove the coolant plugs. Back in the old days, all engines had a block drain.
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