LB7: Coolant leak???

[madmax02]

Well here's the situation, cooling system pumped to 15psi. Lost about 8 pounds in about 6 hours. Upon startup no smoke. NO visible leaks in engine bay with no sweet smell. Just got a call from oil analysis and they confirmed that there was coolant in the oil. When I changed it it was not milkie. No check engine lights hasn't been overheated.

What do you guys think?

 

[JustinD]

Head gasket? I think 01-02 were more problematic than the 03+ trucks? I had to do mine, or maybe an injector cup?

 

[TeaBagger2006]

I'm thinking injector cups

 

[Chevy1925]

Well here's the situation, cooling system pumped to 15psi. Lost about 8 pounds in about 6 hours. Upon startup no smoke. NO visible leaks in engine bay with no sweet smell. Just got a call from oil analysis and they confirmed that there was coolant in the oil. When I changed it it was not milkie. No check engine lights hasn't been overheated.

What do you guys think?

find out what percentage. they should have that on hand or in your analysis.

 

[madmax02]

Here ya go guys. Let me know what you guys think. I know it comes down to head gasket or injector cups.

https://docs.google.com/file/d/147T7egRdpFC7dAGRqXOiFtsdQPyXKJ3ouNJGSLAG9rexvB2oDuj151A1U5J5/edit

 

[madmax02]

Any suggestions guys?

 

[THEFERMANATOR]

Coolant in the oil without it going into the combustion chamber sure sounds like an injector cup O-ring spraying coolant in under the valve cover to me, but it could also be a head gasket leaking into one of the oil galley drains as well. Pull the valve covers and pressurize the system is where I would go next.

 

[Chevy1925]

Coolant in the oil without it going into the combustion chamber sure sounds like an injector cup O-ring spraying coolant in under the valve cover to me, but it could also be a head gasket leaking into one of the oil galley drains as well. Pull the valve covers and pressurize the system is where I would go next.

x2

 

[madmax02]

If I can get it on a tech II would that tell me anything or help distinguish between hg or injector cup?

 

[Chevy1925]

If I can get it on a tech II would that tell me anything or help distinguish between hg or injector cup?

nope unless there is something im not thinkin off the top of my head that would help.

 

[madmax02]

So really best thing would be pull valve cover and pressurize the system again and see if I can find coolant sitting/leaking around an injector.

 

[Chevy1925]

So really best thing would be pull valve cover and pressurize the system again and see if I can find coolant sitting/leaking around an injector.

Yup. make sure your coolant is topped off and there is no air at the little bleed screw on top of the thermostats before you test.