8087-7800 Engine

8V92TA Engine for HEMTT

The 8087-7800 engine is a six-cylinder V6 configuration two-stroke turbocharged and aftercooled diesel engine with 92cid (Cubic Inch Displacement) per cylinder, Model 8V92TA. The 8087-7800 engine is managed by DDEC II (Detroit Diesel Electronic Control) and is used in the M977 HEMTT vehicles. This 8V92TA engine has a total displacement of 736 cubic inches and can produce up to 500 SAE brake horsepower and 1250 lb/ft torque.

The two-stroke diesel has a maximum speed of 2250 RPM and a small, light package compared to its maximum torque rating.

Engine with Container
NSN: 2815-01-257-3879 / Part Number: 5705718
Engine without Container
NSN: 2815-01-132-1417 / Part Number: 12361134 or 1319410U
Engine Container
NSN: 8145-01-249-1690 / Part Number: 12378328

8V92TA Engine Features

  • High Reliability
  • Wide Environmental Tolerance
  • Ease of Maintenance
  • High-Torque for Physical Size
  • Multi-Fuel Capable
  • Robust Design
8087-7800 Engine 8V92TA for HEMTT
8087-7800 Engine 8V92TA for HEMTT
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Turbocharged 2-Cycle Diesel Turbocharged 2-Cycle Diesel

On two-cycle diesel engines, normal aspiration refers to the engine having "neutral" air intake boost pressure. As 2-Stroke diesel engines do not have intake valves, a positive pressure must be generated to push the intake air into the cylinder which is provided by a supercharger, but the supercharger is not considered a pressure boost device as the induction of air into the cylinder causes a neutral average pressure in the intake system.

In turbocharged engine models, one or more turbochargers are used to provide positive boosted intake pressures to increase combustion efficiency and power output.

Supercharger NSN: 4140-01-141-1257
Supercharger Part Number: 5101484
8087-7899 Engine 8V92TA Blower Midi Bypass
8087-7899 Engine 8V92TA Blower Midi Bypass

Speed Limiting Governor Speed Limiting Governor

8087-7899 engines are equipped with a speed-limiting governor. A speed limiting governor reduces the fuel injected into the cylinders once the desired maximum speed is reached. The linkage from governor to injector contains a hydraulic damper piston to reduce the rate of throttle change and protect against speed hunting. The 8V92TA is well known to have a mode of failure called "run-away". Run Away occurs when the governor mechanism fails or is incorrectly adjusted. The fuel injectors of the 8087-7899 are sprung loaded to maximum fuel. The governor and its linkages must be functional to reduce the fuel to prevent run away where the engine will keep accelerating until the engine fails. The only way to stop run away once it is happening is to shut off the air supply to the engine intake.

Lubrication System Lubrication System

The 8087-7899 engine has a rotary oil pump located within a housing on the front of the engine directly driven by the crankshaft. The georotor pump has 1.5" wide pump gears for higher capacity flow and is driven on a spline on the crankshaft. Gerotor pumps use a trochoidal inner rotor and an outer rotor formed by a circle with intersecting circular arcs. A suction tube and screened pickup suck oil from the oil pan. There are two oil pressure regulating valves in the oil pump housing that regulate the engine oil pressure.

Oil Pump NSN: 4320-01-038-8118
Oil Pump Part Number: 5198840
8087-7899 Engine 8V92TA Oil Pump
8087-7899 Engine 8V92TA Oil Pump

Cold Starting Aid Cold Starting Aid

The 8087-7899 engine has an air box flame heater system as a cold starting aid. The vehicle operator can operate the heating system remotely from their control station. When operated, a solenoid valve is opened allowing diesel fuel from the vehicle under pressure from the vehicle's electric fuel pumps to be fed to a spray nozzle located in the air box of the engine. An engine mounted electric air pump provides pressurized air to a nozzle in the air box of the engine. An engine mounted spark generator then provides high-voltage pulses to a spark plug adjacent to the fuel and air nozzles in the engine's air box. The fuel-air mixture is ignited repeatedly causing the intake air for the engine to be heated and assisting in cold starts.