Medium and Heavy Trucks
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Thanks for asking your question and requesting me. I can help you with this.
There should not be any diesel fuel leaking at from the valve stem. If it is, I would assume the head may be cracked.
Please reply back if you need more help. I am happy to assist.
I was able to see it. WOW! I've never seen one do this before. I would say the head must be cracked. ITs the only explanation.