Posted by Owen Aaland on September 15, 2008 at 21:44:55 from (65.161.86.22):
In Reply to: D414 posted by FarmerCMS on September 15, 2008 at 18:37:38:
The D414 and DT414 have the same engine block with the exception of two cooling jets per piston on the turboed block versus one per piston on the NA (naturally aspirated) block. The holes for the extra jet on the NA block will have a steel ball plugging them.
The turbo charged engine uses different pistons and rings. Diesel engines use keystone rings in the top two grooves while the NA engine uses a keystone ring in the top groove and a standard ring in the second groove. The turboed engine uses an oil pump with a wider rotor assembly. The rotor width was increased in both turboed and NA engines later in production. The water pump on the turboed engine will have eight vanes while the NA engine most likely came with a four vane impeller. Common practice is to use the turbo water pump on either engine.
Cylinder heads are different between the two models. The turboed head has different cooling jets pressed into it. NA heads can be identified by an H cast into them covered by the intake manifold.
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