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Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 8823
Experience:  I am ASE Master Truck Certified.
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I have a new C15-515 cylinder head that is leaking diesel

Customer Question

Hi Again i have a new C15-515 cylinder head that is leaking diesel from one of the stem seal guides we have taken it to the local engineering shop and they are busy with it they are also puzzled as the diesel and the valve stem do not link or do they. I have a video as well that could better explain the problem.
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Cat Man replied 1 year ago.

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.

Customer: replied 1 year ago.
It is a new head that we have just installed the engine has not even run is it that the head was cracked already i have a video for this.
Expert:  Cat Man replied 1 year ago.
I see. Was it a reman head? Can you attach the video?
Customer: replied 1 year ago.
Attached the video
Customer: replied 1 year ago.
This is when using the hand priming pump
Expert:  Cat Man replied 1 year ago.
Sorry. I'm not able to open.
I would remove the injector on that cylinder yo make sure the O rings are ok. If they are. The head must be cracked.
Please reply back if you need more help or have more questions. I am happy to assist.
Customer: replied 1 year ago.
The O rings are bad but how do they link to the valve guide is there a way i can attch the video maybe email as its refusing to upoad its in mp4 format.
Customer: replied 1 year ago.
I have reattached the video please view and let me know.
Expert:  Cat Man replied 1 year ago.

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.

Expert:  Cat Man replied 1 year ago.
Hey. I just wanted to see how things were going. Please let me know if you need more help. I am happy to assist. If my information was helpful, please leave a good or higher rating so that I receive credit. Thanks.

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