5.2L Isuzu 4HK1 Specs
| Engine | Isuzu 5.2L 4HK1-TC | |
| Manufacturer | Isuzu Motors Ltd. | |
| Applications | 2005 - 2020 Isuzu N Series | |
| Type | 4 stroke direct injection (DI) diesel | |
| Configuration | Inline 4 cylinder (I-4/L-4) | |
| Displacement | 5.19 liters, 317.18 CID | |
| Firing Order | 1 - 3 - 4 - 2 | |
| Engine Block | Cast iron | |
| Cylinder Head | Cast iron | |
| Cylinder Liner Type | Dry | |
| Compression Ratio | 2005 - 2006 | 18.5 : 1 |
| 2007 - 2015 | 17.5 : 1 | |
| 2016 - 2020 | 16.5 : 1 | |
| Cylinder Bore | 4.53 in (115 mm) | |
| Cylinder Stroke | 4.92 in (125 mm) | |
| Valvetrain | Gear driven single overhead camshaft (SOHC), 16 valve (4 valves per cylinder) | |
| Valve lash/clearance | Intake | 0.4 mm (0.016 inch) |
| Exhaust | 0.4 mm (0.016 inch) | |
| Injection | Direct injection, high pressure common rail | |
| Aspiration | Turbocharged, intercooled | |
| Engine Dimensions (approx.) | Length | 40.7 inches |
| Width | 36.6 inches | |
| Height | 40.9 inches | |
| Engine Weight (approx) | 1,170 lbs | |
| Engine Oil Capacity | Application dependent - refer to owners/service manual; oil capacity varies w/ application & model year | |
| B10 Life | 2017 & prior | 310,000 miles |
| 2018+ | 375,000 miles | |
| Horsepower* | 215 hp @ 2,500 rpm | |
| Torque* | 2019 & prior | 452 lb-ft @ 1,850 rpm |
| 2020 | 520 lb-ft @ 1,600 rpm | |
| Idle Speed | 2005 - 2006 | ~ 750 rpm |
| 2007 + | ~ 650 rpm | |
| Max Engine Speed | 2,400 rpm (@ full load) | |
*2019 Isuzu N-Series horsepower & torque ratings; ratings may vary in alternative applications.
2005 - 2006 Isuzu N-Series Maintenance Schedule (5.2L Diesel, NO DPF)
| Service Procedure | Service Interval | Notes |
| Replace engine air filter | Every 26,000 miles/12 months | Inspect @ oil change intervals, replace as necessary |
| Replace engine oil & oil filter | Every 6,500 miles/12 months | --- |
| Replace fuel filter | Every 13,000 miles/12 months | Replace fuel filter(s) and drain fuel-water separator |
| Replace engine drive belt | 104,000 miles | Inspect @ oil change intervals, replace as necessary |
| Drain/replace engine coolant | Every 26,000 miles/24 months | --- |
| Adjust valve lash | Every 52,000 miles | 0.4 mm valve clearance for intake and exhaust valves; excessive engine noise may be caused by poor valve lash adjustment |
2007 - 2010 N-Series Maintenance Schedule (5.2L Diesel w/ DPF)
| Service Procedure | Service Interval | Notes | |
| Replace engine air filter | As necessary | Inspect @ oil change intervals, replace as necessary; air clean assembly has built in filter condition indicator | |
| Replace engine oil & oil filter | Every 10,000 miles/12 months | --- | |
| Replace fuel filter | Every 15,000 miles/12 months | Replace fuel filter(s) and drain fuel-water separator | |
| Replace engine drive belt | As necessary | Inspect @ oil change intervals, replace as necessary | |
| Drain/replace engine coolant | 30,000 miles/24 months | --- | |
| Adjust valve lash | Every 50,000 miles | 0.4 mm valve clearance for intake and exhaust valves; excessive engine noise may be caused by poor valve lash adjustment | |
| Clean diesel particulate filter (DPF) | Initial service: | 100,000 miles/3,000 hrs | Clean DPF initially @ 100,000 miles, followed by every 70,000 miles |
| Subsequent service: | Every 70,000 miles/2,000 hrs | ||
2011 - 2019 Isuzu N-Series Maintenance Schedule (5.2L Diesel w/ DPF)
| Service Procedure | Service Interval | Notes |
| Replace engine air filter | As necessary | Inspect @ oil change intervals, replace as necessary; air clean assembly has built in filter condition indicator |
| Replace engine oil & oil filter | Every 10,000 miles/12 months | --- |
| Replace fuel filter | Every 15,000 miles/24 months | Replace fuel filter(s) and drain fuel-water separator |
| Replace engine drive belt | As necessary | Inspect every 10k/12 mo |
| Drain/replace engine coolant | 24 months | --- |
| Adjust valve lash | Every 50,000 miles | 0.4 mm valve clearance for intake and exhaust valves; excessive engine noise may be caused by poor valve lash adjustment |
| Clean diesel particulate filter (DPF) | 100,000 miles/3,000 hrs | --- |