Ford Loud hissing from exhaust pipe after 6.9 rebuild? (1 Viewer)

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Oct 26, 2013
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Laytonville California
Hi guys,

I just finished a rebuild on my 1980's ford 6.9 diesel. Its naturally aspirated.
I did a full rebuild, and the engine runs and drives. It smokes a lot more than it used to, but its got less than two miles on it.

When the truck is running, there is a LOUD hissing from the tailpipe. Its almost like someone put a high pressure air hose into the exhaust (thats the sound it makes). I am going to hunt for exhaust leaks, but I'm worried this might be more sinister. If anyone has any ideas let me know.

Thanks! -W
 

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