GMC diesel V6 Trucks 60° 478 CID (7.8 L) DH478 engine DIY maintenance and service manual

General Information

GMC diesel V6 Trucks 60° 478 CID (7.8 L) DH478 is an 477.7 in³ (7.83 L) internal combustion reciprocating V6 engine. It has bore/stroke ratio of 5.125 in × 3.86 in (13.018 cm × 9.8 cm), and uses 17.5:1 compression. This engine was rated 155 hp (115.58 kW) at 3200 rpm and 298 lbf⋅ft (404.03 N⋅m) of torque at 2000 rpm. It was used in Chevrolet and GMC cars.

Engine Performance Rating

SAE J1995 (SAE Gross)

GMC diesel V6 Trucks 60° 478 CID (7.8 L) DH478 engine performance rating according to SAE J1995 (SAE Gross) standard.
Parameter	Output
Power Rating	170 hp (126.77 kW) at 3200 RPM
Torque Rating	420.3 N⋅m310 lbf⋅ft310 lbf⋅ft at 2000 RPM

SAE J1349 (SAE Net)

GMC diesel V6 Trucks 60° 478 CID (7.8 L) DH478 engine performance rating according to SAE J1349 (SAE Net) standard.
Parameter	Output
Power Rating	155 hp (115.58 kW) at 3200 RPM
Torque Rating	404.03 N⋅m298 lbf⋅ft298 lbf⋅ft at 2000 RPM

Specifications

General

GMC diesel V6 Trucks 60° 478 CID (7.8 L) DH478 engine general specifications.
Parameter	Value
Type	Internal Combustion Reciprocating
Fuel Type	Diesel
Cylinder Configuration	V6
Engine Displacement	7.83 L477.7 in³477.7 in³
Bore	13.018 cm5.125 in5.125 in
Stroke	9.8 cm3.86 in3.86 in
Compression Ratio	17.5:1
Firing Order	1-6-5-4-3-2
Curb Weight	430.91 kg950 lb950 lb

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Block, crankshaft and pistons

GMC diesel V6 Trucks 60° 478 CID (7.8 L) DH478 engine block, crankshaft and pistons specifications.
Parameter	Value
Block Material	Chrome-nickel alloy cast iron
Crankshaft Material	Drop-forged steel
Piston Material	Permanent mold cast aluminum, tin plated
Piston Pin Material	Tubular alloy steel
Connecting Rod Material	Drop-forged heat-treated steel

Engine head and valvetrain

GMC diesel V6 Trucks 60° 478 CID (7.8 L) DH478 engine head and valvetrain specifications.
Parameter	Value
Head Material	Chrome-nickel alloy cast iron
Valvetrain Type	OHV
Valves per Cylinder	2
Camshaft Material	High-strength electric furnace iron

Air Intake

GMC diesel V6 Trucks 60° 478 CID (7.8 L) DH478 air intake specifications.
Parameter	Value
Air Intake Method	Naturally Aspirated

Fuel Injection

GMC diesel V6 Trucks 60° 478 CID (7.8 L) DH478 fuel injection specifications.
Parameter	Value
Injection Type	Multi Point
Injection Info	Compression

Oil Pump

GMC diesel V6 Trucks 60° 478 CID (7.8 L) DH478 oil pump specifications.
Parameter	Value
Oil Pump	Rotor
Oil Pump Pressure	4.08 atm.60 Psi60 Psi
Oil Pump Capacity	60.56 lpm13.32 UK gpm16 US gpm at 3200 RPM