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Originally Posted by nglitz
Pardon a question from a non-Dieselhead that's willing to learn.
What's nailing? Is it anything like preignition/detonation in a gas engine? what would cause it? Fuel getting into a cylinder too early?
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Lots written in here about nailing but, basically it is when fuel is introduced to the cylinder prematurely during the compression stroke (leaking injector et al) and some combustion takes place. Sounds like a hammer hitting a nail into hardwood.