Isuzu KB P190. Service manual — part 199

TROUBLESHOOTING 6 – 11

9. Oil Pressure Does Not Rise

Step Action Value(s)

Yes

No

1

Was the oil pressure warning lamp working OK?

—

Go to Step 2

Replace the oil

pressure

warning lamp

2

Does the oil filter element clog?

—

Replace the oil

filter element

Go to Step 3

3

Does the relief valve open?

—

Repair

or

replace the

relief valve

Go to Step 4

4

Does the oil strainer clog?

—

Clean

or

replace the oil

strainer Go

to

Step 5

5

Was the oil pump working OK? (The pump related
parts worn etc.)

—

Go to Step 6

Repair or

replace the oil

pump.

6

Was the rocker arm and/or relation parts worn?

—

Replace

the

rocker arm

and/or relation

parts Go

to

Step 7

7

Was the camshaft and/or relation parts worn?

—

Replace

the

camshaft

and/or relation

parts Go

to

Step 8

8

Was the crankshaft and/or relation parts worn?

—

Replace

the

crankshaft

and/or relation

parts Go

to

Step 9

9

Are any DTC stored?

—

Go

to

indicated

DTC Solved

Table of pressure unit

Pressure kPa

(kg/cm

2

) 100

(1.0)

980

(10.0)

Resistance ohm

81

30

Electric current

A

63.5

106.7

6 – 12 TROUBLESHOOTING

10. Abnormal Engine Noise

10

–

1 Engine knocking

Step Action Value(s)

Yes

No

1

Was the injection nozzle pressure or injection spray
pattern OK?

—

Go to Step 2

Replace the

injection nozzle

2

Was the compression pressure OK?

3.0 MPa

(31.0 kg/cm

2

,

441 psi) at

200 rpm

Go to Step 3

Replace the

cylinder head

gasket or

piston ring

3

Are any DTC stored?

—

Go

to

indicated

DTC Solved

10

–

2 Gas leakage noise

Step Action Value(s)

Yes

No

1

Was the exhaust pipe loose or broken?

—

Retighten

or

replace the

exhaust pipe

Go to Step 2

2

Was the exhaust manifold loose?

—

Retighten or

replace the

exhaust

manifold. Or

replace the

exhaust

manifold gasket

Go to Step 3

3

Was the injection nozzle loose?

—

Retighten

or

replace the

injection nozzle

fixing bolt

Go to Step 4

4

Was the cylinder head gasket broken?

—

Replace

the

cylinder head

gasket Go

to

Step 5

5

Are any DTC stored?

—

Go

to

indicated

DTC Solved

TROUBLESHOOTING 6 – 13

10

–

3 Continuous noise

Step Action Value(s)

Yes

No

1

Was the fan belt tension OK?

9

–

13 mm

(0.35

–

0.51

in)

Go to Step 2

Adjust the fan

belt tension.

2

Was the cooling fan loose?

—

Tighten

the

cooling fan

Go to Step 3

3

Was noise coming from the generator?

—

Repair

or

replace the

generator

and/or the

vacuum pump

Go to Step 4

4

Was noise coming from the water pump?

—

Replace

the

water pump

Go to Step 5

5

Was noise coming from the cylinder head cover?

—

Readjust

the

valve

clearance. Go

to

Step 6

6

Are any DTC stored?

—

Go

to

indicated

DTC Solved

10-4 Slapping noise

Step Action Value(s)

Yes

No

1

Was noise coming from the cylinder head cover?

—

Go

to

Step 2 Go

to

Step 4

2

Were valve clearances correct?

0.4 mm

(0.016 in)

both intake

and exhaust

Adjust the

valve

clearances Go

to

Step 3

3

Were the rocker arms damaged?

—

Replace

the

rocker arms

Go to Step 4

4

Was the flywheel fixing bolt loose?

—

Tighten

the

fixing bolt.

Go to Step 5

5

Was noise coming from the cylinder body?

—

Go

to

Step 6 Go

to

Step 10

6

Inspect the crankshaft bearing and/or crankshaft.
Was the crankshaft bearing and/or crankshaft worn?

—

Replace

the

worn parts

Go to Step 7

7

Inspect the connecting rod bearing and/or crankpin.
Was the connecting rod bearing and/or crankpin
worn?

—

Replace the

worn parts

Go to Step 8

8

Inspect the connecting rod small end bushing and/or
piston pin.
Was the connecting rod small end bushing and/or
piston pin worn?

—

Replace the

worn parts

Go to Step 9

9

Inspect the piston and/or cylinder liner.
Was the piston and/or cylinder liner worn or
damaged?

—

Replace

the

worn or

damaged parts

Go to Step 10

10

Are any DTC stored?

—

Go

to

indicated

DTC Solved

6 – 14 TROUBLESHOOTING

10-5 Excessive turbocharger noise

The vibration noise (the air aspiration noise) occurred when turbocharger rotates, it is normal condition of the
turbocharger, no necessary any actions.

Step Action Value(s)

Yes

No

1

Was the excessive noise coming from the
turbocharger?

—

Go to Step 2 Go

to

Step 10

2

Inspect the fixing bolts and bands.
Was any problem found?

—

Tighten

the

loose parts

Go to Step 3

3

Was the intake or exhaust system gasket damaged?

—

Replace

the

damaged

gasket. Go

to

Step 4

4

Inspect rotation parts condition.
Was the turbine wheel rotation rough?

—

Replace

the

turbocharger. Go

to

Step 5

5

Inspect the turbine wheel.
Was the turbine wheel rubbing against housing?

—

Replace

the

turbocharger. Go

to

Step 6

6

Was the turbine wheel damaged?

—

Replace

the

turbocharger. Go

to

Step 7

7

Were there carbon deposits in the turbine or
compressor housing?

—

Clean

or

replace the

turbocharger. Go

to

Step 8

8

Inspect the oil supply condition.
Was the oil feed pipe clogged?

—

Repair

or

replace the oil

feed pipe.

Go to Step 9

9

Was the turbine shaft bearing worn?

—

Replace

the

turbocharger. Go

to

Step 10

10

Are any DTC stored?

—

Go

to

indicated

DTC Solved

11. Rotating Part Wear of Turbocharger

Step Action Value(s)

Yes

No

1

Inspect engine oil.
Was it contaminated with foreign materials?

—

Replace

the

engine oil

Go to Step 2

2

Was the recommended engine oil grade/viscosity
being used?

API CD or

ISUZU

genuine/

10W

–

30

Go to Step 3

Replace the

engine oil

3

Was the oil feed pipe restricted?

—

Clean

or

replace the oil

feed pipe

Go to Step 4

4

Was the oil seal of turbocharger defective?

—

Replace the oil

seal Go

to

Step 5

5

Was the center housing oil drain passage clogged?

—

Clean

center

housing or

replace the

turbocharger Go

to

Step 6

6

Was there oil sludge and/or coking on the turbine
shaft?

—

Replace

the

turbocharger Go

to

Step 7

7

Are any DTC stored?

—

Go

to

indicated

DTC Solved