New Holland N843H, N843L, N843, N844LT, N844L, N844T, N844 ISM Tier 3 Diesel Engine Shop Manual

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Covers: New Holland N843H, N843L, N843, N844LT, N844L, N844T, N844 ISM Tier 3 diesel engines
Pages: 316
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This manual contains technical repair and overhaul information for the New Holland N843H, N843L, N843, N844LT, N844L, N844T, N844 ISM Tier 3 engine and fuel system. This shop manual is a must for all mechanics working on the engine. View the New Holland N843H, N843L, N843, N844LT, N844L, N844T, N844 ISM Tier 3 Diesel Engine Shop Manual on your computer/tablet or print off pages as needed.

Topics in the New Holland N843H, N843L, N843, N844LT, N844L, N844T, N844 ISM Tier 3 Diesel Engine Shop Manual:

Engine

  • Specifications and Torques
  • Engine and crankcase
  • Pan and covers
  • Valve drive and gears
  • Cylinder heads
  • Connecting rods and pistons
  • Crankshaft and flywheel
  • Balancer and damper
  • Pump drives
  • Fuel injection system
  • Turbocharger and lines
  • Intake and exhaust manifolds and muffler
  • Engine cooling system
  • Engine lubrication system

Electrical systems

  • Cab engine controls
  • Engine starting system
  • Alternator
  • Cold start aid
  • Fuel injection system
  • Engine cooling system
  • Engine oil system

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Engine – General specification
Engine model N843
N843L
Number of cylinders 3
3
Bore x stroke 84 mm x 90 mm ( 3.31 in x 3.54 in) 84 mm x
100 mm ( 3.31 in x 3.94 in)
Displacement 1496 cm³ (91.3 in³)
1662 cm³ (101.4 in³)
Compression ratio 22:1
22.4:1
Engine speed (Low idle no load) 950 – 1050 RPM
950 – 1050 RPM Engine speed (High idle no load) 3130 – 3180 RPM
3420 – 3500 RPM PTO engine horsepower 28.3 kW (38.5
Hp) 26.1 kW (35.5 Hp)
Firing order 1-2-3
1-2-3
Cylinder arrangement In-Line vertical
In-Line vertical Valve arrangement
Overhead Overhead

Compression pressure at 200 RPM
(cylinder speed)

2944 ± 345 kPa (427 ± 50 psi) 2944 ± 345 kPa (427 ± 50 psi)

Variation between cylinders 345 kPa (50 psi)
345 kPa (50 psi)

NOTE: If bore size exceeds 85.2 mm (3.3543 in) replace with long block.

Engine – General specification
Engine model N844 N844T
N844L N844LT Number of cylinders 4
4 4 4
Bore x stroke 84 mm x 90 mm (
3.31 in x 3.54 in)
84 mm x 90 mm (
3.31 in x 3.54 in)
84 mm x 100 mm (
3.31 in x 3.94 in)
84 mm x 100 mm (
3.31 in x 3.94 in)
Displacement 1995 cm³ (121.7 in³) 1995 cm³ (121.7 in³) 2216 cm³ ( 135.2 in³)
2216 cm³ ( 135.2 in³)
Compression ratio 22:1 22:1
22.4:1 22.4:1
Aspiration
Indirect naturally
aspirated
Indirect turbocharged with waste gate
Emissions control
N/A Internal Exhaust Gas
Recirculation (EGR)
Engine speed (Low idle no load)
Engine speed (Rated
– full load)
Engine speed (High idle no load) Horsepower @ 2800 RPM
Peak torque @
1800 RPM
900 – 1000 RPM 900 – 1000 RPM 1200 RPM +/- 50 1050 – 1150 RPM

2800 RPM

3090 – 3190 RPM 3090 – 3190 RPM 3000 RPM +/- 40 3090 – 3190 RPM

29.8 kW (40.5 Hp) 38.8 kW (52.8 Hp) 35.9 kW (48.8 Hp) 44.1 kW (60.0 Hp)

143 N·m (105.5 lb ft) 171 N·m (126 lb ft)

Firing order 1-3-4-2 1-3-4-2
1-3-4-2 1-3-4-2
Cylinder arrangement In-Line vertical In-Line vertical In-Line
vertical In-Line vertical Valve arrangement Overhead
Overhead Overhead Overhead
Compression pressure at 200 RPM (cylinder speed)
2944 ± 345 kPa (427
± 50 psi)
2944 ± 345 kPa (427
± 50 psi)
2944 ± 345 kPa (427
± 50 psi)
2944 ± 345 kPa (427
± 50 psi)

Variation between cylinders

345 kPa (50 psi) 345 kPa (50 psi) 345 kPa (50 psi) 345 kPa (50 psi)

Oil filtration Replaceable full flow
spin on cartridge
Oil capacity with filter
10.4 L (11 US qt)
Water pump (Style)
Centrifugal

Water pump (Flow @ rated RPM)

57.5 L/min (15.2 US gpm)

Injection pump
Bosch In-Line mechanical injection

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