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chevy 6 liter...water in oil

2

2x4

Well-known Member
2001 chevy 2500HD 6 liter engine with automatic tranny. Checked motor oil today, oil with water way over full. For 2 years its been losing coolant but couldn't see where. Today for first time ever, coolant showed on dipstick. Changed oil & filter 700 miles ago, no sign of coolant. Drove it about 200 yards to the barn, oil pressure same as always. Before, I barely stepped on accelerator & it took off. Noticed today it didn't want to move until the accelerator was pressed way down. Any known weaknesses that caused this leakage? Seems to me a buddy said several Chevys in a fleet he knew of had water pumps that leaked back into the motor. Truck sees only long distance Interstate trips or short trips on the farm. Prolly 5000 miles/yr. Assuming its the water pump & not head gasket or cracked block, and that it just started leaking coolant, will the engine be harmed bad enough to require overhaul? Or can I drain the oil, fix the problem & the engine is unharmed?
 
First of all, the waterpump on a 2001 GM 6 liter CANNOT leak into the crankcase/engine oil.
 
Head gaskets cracked block can't remember off hand if that oil cooler is in the radiator if it is have seen them busy inside the radiator but most of the time it will pump all the motor oil out of the block if it is the oil cooler other than that not many other ways to get coolant In your oil
 
You are fortunate to have caught it before substantial damage occurred. If you had good oil pressure when you shut it off count your blessings. If you plan on keeping the truck I would not drive it to be repaired with that much coolant in the oil.
 
while we are on this subject how about a 1998 ford exployer with oil in the coolent recovery tank . don't have more on engine as its my cleaning lady's vehicle . only thing i can think of is transmission cooler leaking in the radiator .
 
I have a 2002 GMC with the same engine, mine has been loosing coolant, but also can not figure out where, even have pressure tested with no results. Please keep us updated on this, as I will be very interested in knowing what you find is the source of the issue. It may prompt me to do a replacement before it gets that bad.
 
No experience with 6.0, but my Chevy developed an intake manifold gasket leak and would leak water into the crankcase.
 
I would check real close where the waterpump attaches. Those gaskets are notoriuos for leaking, not always alot or all the time. Had an 01 chevy that would never drip antifreeze but you could see where it ran down the block and evaporated from the engine heat. I think you can now get a one piece gasket to replace the original metal/rubber gasket.
 
(quoted from post at 09:25:45 09/01/16) I would second the intake gasket.
Click to expand...

It's the late LS series small block chev with four head bolts per cylinder instead of five , direct driven oil pump from the crank etc. Not really related to the old style SB you are thinking of.
 
http://www.agcoauto.com/content/news/p2_articleid/148



Sounds like head issues in the 2001-2006 GM LS V8s are common. It is more common on the 4.8 and 5.3 engines.
 
Like some of the other guys said intakes are dry,no way for them to leak,if you have coolant in oil ,lots of the 5.3/6.0 had some bad heads and they will put coolant in oil from top of head under rocker arm area,pull valve covers and see,if leaking coolant usually lots of nasty sludge in there,also pressure check cooling system usually can see heads leaking coolant in
 

Iirc the performance shops such as Summit offer a HD thick wall casting poured from an improved aluminum alloy. The heads come complete with valves, guides, seats, springs and retainers.
Cheaper than repairing old heads and some of those replacement heads will make more HP.
 
go to the website suggested by dhermesc above & you will see exactly what the problem is & it is serious.
 
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