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I have been installing a water pump and head gasket on my cobalt. When I crunk it up to test it out, it ran fine for a few minutes and started slightly shaking. I removed the valve cover and noticed a little bit of milky oil on the bottom of valve cover. I tried a wet and dry compression test and the compression seems fine. I had to tap the water pump to straighten it out in the sprocket. I may have damaged it but do not want to do all that work for nothing. Is there any advice to verify it is the water pump before hand or anything else it could be.
 

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Pressurizing the cooling system with a cooling system tester would be the place to start. I like to use a pressure tester anytime I’m not going to want to have to put everything back and then find out later that it’s leaking. Also I like to use just water in the system before I run the coolant mixture. This way if it leaks, it will easily dry. Antifreeze does not evaporate since it’s a chemical.
 

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Could have been the the wrong head gasket, installed wrong or improperly torqued.
 

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Hey I’ve actually seen a cylinder head installed without the dowel pins. And in turn caused coolant to leak into the oil.
 
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