5.2L Isuzu 4HK1 Diesel Specs

Isuzu 4HK1-TC Engine Specs & Service Information (2005+ N-Series)

The Isuzu 4HK1 features the same cylinder stroke as its predecessor, the 4HE1 (4.8L), but employs a 5 mm larger bore diameter. The 5.2L inline 4 cylinder was introduced for the 2005 model year in Isuzu N-Series cab-over trucks. It features a robust cast iron engine block with dry type cylinder liners, a single overhead camshaft with 4 valves per cylinder, and the most recent models have a 375,000 mile B10 life. The 215 horsepower engine was rated to 452 lb-ft through 2019, but received a peak 520 lb-ft rating for 2020 model year trucks.

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 in)

Exhaust

0.4 mm (0.016 in)

Injection:

Direct injection, high pressure common rail

Aspiration:

Turbocharged, intercooled

Engine Dimensions (approx.):

Length

40.7 in

Width

36.6 in

Height

40.9 in

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

Peak Horsepower*:

215 hp @ 2,500 RPM

Peak 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

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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

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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

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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

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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

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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

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