The Army is considering retrofitting Humvee trucks with new diesel engines
that, according to proponents, would lessen the workload for soldiers in the
Army officials have voiced frustration in recent months about maintenance nightmares
experienced by units in Iraq, where Humvees get overloaded with armor, regularly
break down and often require an engine change after only 1,000 to 2,000 miles
The frequency of the engine swaps has gotten the attention of the Army leadership.
Soldiers complain that it takes eight hours and two people to remove and replace
a Humvee engine.
Most Humvees come with 6.2 or 6.5-liter V-8 engines. But as more trucks are
outfitted with bolt-on armor protection packages—which typically weigh
1,800 pounds—the engines, transmissions and suspensions take a beating,
resulting in vehicle failures.
The newer Humvees are not a concern because they come off the production line
with a beefed up suspension, and bigger engines and transmissions. But the older
Humvees may be candidates for a new diesel engine. The Army’s National
Automotive Center is testing four Humvees equipped with a V-6 diesel made by
Navistar International Truck and Engine Corporation. The engine originally was
designed for the Ford F-150 pickup truck, but Ford recently backed out of the
deal. Navistar nevertheless is expected to keep the engine manufacturing line
alive for other customers, and begin production in October.
The Navistar engine likely will be challenged by other manufacturers in an
upcoming Army procurement competition for a still-undetermined number of engines.
Among the competitors will be a new 6.5-liter engine by AM General, the maker
of the Humvee. The company invested its own funds to develop the engine, specifically
to help address the armor-related weight problem, but sources speculated that
this engine may be too expensive, unless AM General gets additional customers
to spread the costs.
According to a military vehicle expert, a V-6 diesel would be a “wonderful
thing for the Army,” because it would provide higher fuel efficiency,
as well as the additional horsepower and torque that the Humvees need to bear
the excess weight.
The NAC, meanwhile, has contracted the services of Dennis Carlson, a recognized
automotive engineer, who has come up with new techniques to maintain the Humvee
and swap out the engine. If Carlson can work his magic, said one NAC official,
the engine may be able to get changed in less than an hour.