Cxu613 mp8 rust on cam and rockers and pushing coolant

So I just had the valve covers pulled to have the overhead adjusted and mack said that the camshaft and the rockers have rust.

They also said that it saw signs of pushing coolant but I don't know what that means.

What causes this?

Thank you

 

I'm going to look at it in a while. Mack told me that the rockers are so rusty that they have to be replaced and the cam too.
They are talking 18K $$$

Whats this pushing coolant mean?
I believe they were referring to the injectors.

Thank you

 

Thank you

 

Yeah. Mack is saying the rust in the overhead is from sitting for a long time.

They also said that they wanted to pull the injectors because it might need cups.

I wonder if Peterbilt paid for the repairs would it still be a usable unit?

I'm already 5K into it because of regular maintenance items

Obviously I should have had the overhead looked at first so my bad on that one.

Thanks

 

I drove it to the Mack dealer to have it serviced and evaluated.

So I drove it a few miles.