Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 538

6 – 26 TROUBLESHOOTING

4. Slapping Noise

Checkpoint

Trouble

Cause

Countermeasure

Valve clearance

Valve clearance improperly

adjusted

Adjust the valve clearance

Damaged rocker arm

Replace the rocker arm

Rocker arm

Loose flywheel bolts

Retighten the flywheel bolts

Flywheel

Worn or damaged crankshaft

and/or thrust bearings

Replace the crankshaft and/or

the thrust bearings

Crankshaft and thrust bearings

Worn or damaged crankshaft

and/or connecting rod bearings

Replace the crankshaft and/or

the connecting rod bearings

Worn or damaged connecting

rod bushing and piston pin

Replace the connecting rod

bushing and/or the piston pin

Piston and cylinder liner

Worn or damaged piston and

cylinder liner

Foreign material in the cylinder

Replace the piston and the

cylinder liner

OK

OK

OK

OK

NG

NG

NG

NG

NG

NG

NG

Crankshaft and connecting rod

bearings

OK

Connecting rod bushing and

piston pin

OK

TROUBLESHOOTING 6 – 27

TURBOCHARGER

1) ENGINE HAS LESS THAN NORMAL POWER

Checkpoint

Trouble

Cause

Countermeasure

Air cleaner

Restricted

Clean or replace

Restricted

Clean or replace

Intake pipe and hose

Loose (Leaking)

Repair

Compressor/intake manifold

Loose (Leaking)

Repair

Exhaust manifold/turbine inlet

Restricted

Clean or replace

Restricted

Clean or replace

Boost compensator

(Injection pump)

Defective

Repair or replace

OK

OK

OK

OK

NG

NG

NG

NG

NG

NG

NG

Continued on the next page

Exhaust piping and silencers

OK

Air breather

OK

6 – 28 TROUBLESHOOTING

Checkpoint

Trouble

Cause

Countermeasure

Compressor wheel

Impact damage

Replace

Impact damage

Replace

Carbon build-up

Replace

Dragging or seized

Replace

NG

NG

NG

NG

Continued from the previous page

Rotating assembly

OK

Turbine wheel

OK

OK

TROUBLESHOOTING 6 – 29

2) BLUE OR BLACK SMOKE

Checkpoint

Trouble

Cause

Countermeasure

Air cleaner or intercooler

Restricted

Clean, repair, or replace

Leakage

Replace

Turbocharger oil seal

Restricted

Repair or replace

Turbocharger oil drain pipe

Defective

Repair or replace

PCV system

Excessive pressure

Repair

Impact damage

Replace

Turbine wheel

Impact damage

Replace

OK

OK

OK

OK

NG

NG

NG

NG

NG

NG

NG

Continued on the next page

Crankcase

OK

Compressor wheel

OK