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Diesel Boat Doc
Diesel Boat Doc, Marine Mechanic
Category: Boat
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D-D8v71N marine with estimated 4500 hours. Have blowby and

Customer Question

D-D8v71N marine with estimated 4500 hours.
Have blowby and coolant in the oil.
What's involved to cure?
Ran and started well prior to shutdown.
Sister engine has no issues with history of normal oil samples.
Submitted: 11 months ago.
Category: Boat
Expert:  Diesel Boat Doc replied 11 months ago.

Hi I can help you. sounds like a cracked head or possibly a bad head gasket. ether way the next is to pull the head . If you pull the injectors and pressure test the cooling system to find which head to pull.

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