TM 10-3930-671-24 Drive & Steer Tires Model Series Model Drive Tire Size Steer Tire Size GPX GPX 25E 7.00x12 6.50x10 Engine Application Truck Model Type Engine Model Cyls Displacement GPX 25E Diesel Continental TMD27  4 164 cu in.  (2.7 L) Engine Specifications CONTINENTAL TMD27 (2.7L) Basic Specifications TYPE: 4Cylinder In-Line, 4-Cycle FUEL: TMD27 Diesel VALVE ARRANGEMENT: OHV ROTATION: RH viewed 0 fan end DISPLACEMENT: 164 CID (2.68 L) BORE x STROKE: 3.58 x 4.06 in.  (91 x 103 mm) FIRING ORDER: 1-3-4-2 COMPRESSION RATIO: 20.5:1 COMPRESSION PRESSURE:325 psi min 0150 rpm No.  PISTON RINGS:3 (2 Compression, 1 Oil control) NOMINAL RATED SAE POWER: 59.0 hp 0 2800 rpm TORQUE: 119 lb ft (161 Nom) 0 1600 rpm WEIGHT, (Approx.  w/accessories): 568 lb (258 kg) BALANCING SYSTEM:  None CRANKCASE VENTILATION:  Integral closed PCV Cooling System   Capacity: 9.0 qts (8.5L) WATER PUMP: Centrifugal type THERMOSTAT: Wax type Starts To Open At 180°F (82°C) Fully open 204°F (95°C) FAN DRIVE RATIO: 1.589:1 Lubricating System OIL PUMP: Crankshaft-driven, gerotor type Oil Pressure, Normal:  40-60 psi (276-414 kPa) At idle 7 psi (48 kPa) Oil Pressure Switch: Actuates below 4 psi (27 kPa) OIL FILTER:  Full-flow spin-on type ENGINE OIL CAPACITY, w/Filter:  7.0 qt (6.6L) VALVE CLEARANCE, Warm: INT .014 in.  (0.36 mm) EXH .018 in.  (0.46 mm) TMD27 Diesel Fuel System FUEL SUPPLY PUMP:  Electric lift pump from fuel tank Lift Pump Pressure: 1.5-2.25 psi (10-16 kPa) Lift Pump Max Lift: 10 ft (3m) INJECTION PUMP: Stanadyne Gear driven Injector Nozzle Opening Pressure:  2050-2130 psi Injection Pump Timing: 130-15°BTDC @ 1600 RPM GOVERNOR: Mechanical, integral w/injection pump COLD START AID: Glow plugs Engine Speed Settings Idle Speed: 650 rpm (600-700 rpm) No Load Governed Speed: 2600 rpm (2550-2650 rpm) Engine Vacuum Readings (Typical values) Idle: 17-19 in.  Hg No Load Governed Speed: 13-15 in.  Hg Stall: 1-3 in.  Hg Tilt Bypass: 4-6 in.  Hg F-20