Isuzu N-Series. Service manual — part 504
Engine Mechanical (4HK1-TC) 6A-121
• Install within seven minutes after applying liquid
gasket.
Caution:
Apply liquid gasket so that it does not adhere to the O-
ring.
Legend
1. O-ring
• Install the front cover to match with the dowel
pins of the cylinder block.
Caution:
Along with the front cover, install the water pump
assembly (before liquid gasket becomes dry)
Tighten:
Front cover bolt to 24 N
⋅m (2.4 kg⋅m/18 lb⋅ft)
• Tighten bolts with (*) mark together with the
adjust plate of the generator.
• Tighten the oil relief valve (5) with the
designated torque.
Tighten:
Oil relief valve to 39 N
⋅m (4.0 kg⋅m/29 lb⋅ft)
Legend
1. BOLT : L = 35 mm (1.38 in)
2. BOLT : L = 25 mm (0.98 in)
3. BOLT : L = 65 mm (2.56 in)
4. BOLT : L = 30 mm (1.18 in)
5. Oil Relief Valve
3. Install the water pump.
Refer to “Water Pump” in Section 6B.
4. Install the oil pan.
Refer to the “Oil Pan”.
5. Install the front oil seal.
Refer to the “Crankshaft Front Oil Seal”.
N6A6229E
N6A6230E
6A-122 Engine Mechanical (4HK1-TC)
Torque Specifications
N6A6231E
Engine Mechanical (4HK1-TC) 6A-123
Crankshaft Front Oil Seal
Component
Legend
1. Crankshaft Pulley
2. Crankshaft Front Oil Seal
3. Crankshaft Front Slinger
Removal
1. Drain coolant.
2. Remove the starter.
• Disconnect the starter ground cable.
• Disconnect the front frame harness connector
at a position near the transmission control box
and unlatch fixing clips from the harness.
• Remove two mounting bolts.
• Fix the detached starter with a wire or the like at
a position where it will not be a hindrance to
removing the transmission.
3. Disconnect the upper radiator hose on the engine
side.
4. Disconnect the coolant reserve tank hose on the
radiator side.
5. Disconnect the lower radiator hose on the engine
side.
6. Remove the radiator (with the fan guide) detaching
right and left brackets.
7. Remove the fan assembly.
N6A6232E
N6A6215E
N6A6216E
6A-124 Engine Mechanical (4HK1-TC)
• Remove the fan assembly unscrewing four
mounting nuts.
8. Remove the fan belt.
9. Remove the crankshaft pulley.
• Loosen the pulley bolts blocking the crankshaft
from turning by placing a crankshaft stopper on
the starter mounting position on the flywheel
housing.
Caution:
Make sure that the stopper is properly fitted and
engaged with the ring gear.
Special tool
Crankshaft stopper: 5-8840-2230-0 (EN-47680)
10. Remove the crankshaft front oil seal.
• Remove only the oil seal off with a screwdriver
or the like avoiding damage to the oil seal
contact surface on the front cover and the shaft.
Legend
1. Felt
2. Slinger
3. Oil Seal
11. Remove the crankshaft front slinger.
• Pull out the slinger using a slinger puller.
(Fixing the circumference of the puller with a
clip band will make the procedure easier.)
Special tool
Slinger puller: 8-9439-6858-0 (J-43285)
N6A6233E
N6A6234E
N6A6235E
N6A6236E
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