Dodge 2001 Ram 1500 Owner's Manual page 1378

BR/BE
ENGINE 5.9L DIESEL
DESCRIPTION
The cylinder block is constructed of cast iron. The
casting is a skirted design which incorporates longi-
tudal ribs for superior strength and noise reduction.
The block incorporates metric straight thread o-ring
fittings at lubrication oil access points. The engine is
manufactured with the cylinders being a non-sleeved
type cylinder. However, one approved service method
is to bore out the cylinders and add cylinder sleeves
to the cylinder block.
The cylinders are numbered front front to rear
(Fig. 1); 1 to 6. The firing order is 1–5–3–6–2–4.
Cummins 24 Valve Turbo Diesel Engine
ENGINE 5.9L DIESEL
Fig. 1 Cylinder Numbering
9 - 231