Looks to be an F head? I only see 6 valves.
i'm no diesel mechanic and my only experience with detroit diesels is as the
gray marine engine so popular with yachtsmen and fishermen. they are 2 stroke diesels and don't use a poppet type intake valve (i think). i have heard that they could run without rod bearing caps.
from wikipedia:
The
Detroit Diesel Series 71 is a
two-stroke diesel engine series, available in both
inline and
V configurations, with the inline models including one, two, three, four and six cylinders, and the V-types including six, eight, 12, 16 and 24 cylinders. The two largest V units used multiple cylinder heads per bank to keep the head size and weight to manageable proportions, the V-16 using four heads from the four-cylinder inline model and the V-24 using four heads from the inline six-cylinder model. This feature also assisted in keeping down the overall cost of these large engines by maintaining parts commonality with the smaller models.
The inline six-cylinder 71 series engine was introduced as the initial flagship product of the
Detroit Diesel Engine Division of
General Motors in 1938. The V-type first appeared in 1957. The 71 in the model series designation refers to the
displacement per cylinder in cubic inches (actually 70.93 cu in / 1,162.4 cc). Bore and stroke is the same to all units, at 4.25 x 5.0 inches (107.95 x 127 mm).
All Series 71 engines utilize
uniflow scavenging, where a
gear-driven
Roots type blower mounted to the exterior of the engine provides intake air through cored passages in the engine block and ports in the cylinder walls at slightly greater than atmospheric pressure. The engine exhausts through pushrod-operated
poppet valves in the cylinder head(s), with either two or four valves per cylinder.
Unit injection is employed, one
injector per cylinder, with no high fuel pressure outside of the injector body. The injectors are cycled from the same
camshaft responsible for opening the exhaust valves.
As a two-stroke diesel engine that does not use crankcase aspiration cannot naturally aspirate (draw in) intake air, a blower is necessary to provide sufficient air to scavenge exhaust gasses from the cylinders and to supply air for combustion. Later high-performance versions were available with
turbochargers, and turbochargers with
intercooling, the turbochargers discharging into the Roots blower intake.
The 71 Series went out of the Market since summer of 1995 and the Four Stroke Detroit Diesel Engine was introduced as a replacement.
