2004 ISUZU TF SERIES towing

ENGINE MECHANICAL (6VE1 3.5L) 6A-17
Engine Oil Consumption Excessive
Symptom Possible Cause Action
Oil leaking Oil pan drain plug loose Retighten or replace gasket
Crankcase fixing bolts loosened Retighten
Oil pan setting bolts loosened Retighten
Oil pan gasket broken Replace gasket
Front cover retaining bolts loose or
gasket broken Retighten or replace gasket
Head cover fixing bolts loose or
gasket broken Retighten or replace gasket
Oil filter adapter cracked Replace
Oil filter attachings bolt loose or
rubber gasket broken Retighten or replace oil filter
Oil cooler broken Replace
Crankshaft front or rear oil seal
defective Replace oil seal
Oil pressure unit loose or broken Retighten or replace
Blow–by gas hose broken Replace hose
Positive Crankcase Ventilation Valve
clogged Clean
Engine/Transmission coupling failed Replace oil seal
Oil leaking into combustion chambers
due to poor seal in valve system Valve stem oil seal defective Replace
Valve stem or valve guide worn Replace valve and valve guide
Oil leaking into combustion chambers
due to poor seal in cylinder parts Cylinders and pistons worn
excessively Replace cylinder body assembly and
pistons
Piston ring gaps incorrectly
positioned Correct
Piston rings set with wrong side up Correct
Piston ring sticking Replace cylinder body assembly and
pistons
Piston ring and ring groove worn Replace pistons and others
Return ports in oil rings clogged Clean piston and replace rings
Positive Crankcase Ventilation
System malfunctioning Positive Crankcase Ventilation Valve
clogged Clean
Others Improper oil viscosity Use oil of recommended S.A.E.
viscosity
Continuous high speed driving and/or
severe usage such as trailer towing Continuous high speed operation
and/or severe usage will normally
cause increased oil consumption

6-12 ENGINE DIAGNOSIS (C24SE)
Engine Oil Consumption Excessive
Condition Possible cause Correction
Oil leaking Oil pan drain plug loose Retighten or replace gasket
Oil pan setting bolds loosened Retighten
Oil pan gasket broken Replace gasket
Front cover retaining bolts loose
or gasket broken Retighten or replace gasket
Head cover retaining bolts loose
or gasket broken Retighten or replace gasket
Oil filter adapter cracked Replace
Oil filter attaching bolt loose or
rubber gasket broken Retighten or replace oil filter
Crankshaft front or rear oil seal
defective Replace oil seal
Oil pressure unit loose or broken Retighten or replace
Blow-by gas hose broken Replace hose
Engine/Transmission coupling
area Replace oil seal
Oil leaking into combustion
chambers due to poor seal in
valve system Valve stem oil seal defective Replace
Valve stem or valve guide worn Replace valve and valve guide
Oil leaking into combustion
chambers due to poor seal in
cylinder parts Cylinders and pistons worn
excessively Rebore cylinder and replace
pistons and others
Piston ring gaps incorrectly
positioned Correct
Piston rings set with wrong side
up Correct
Piston rings sticking Rebore cylinder and replace
pistons and others
Piston ring and ring groove worn Replace pistons and others
Return ports in oil rings clogged Clean piston and replace rings
Crank case ventilation, Positive
Crankcase Ventilation System
malfunctioning Positive Crankcase Ventilation
Hose clogged Clean
Others Improper oil viscosity Use oil of recommended S.A.E.
viscosity
Continuous high speed driving
and or severe usage such as
trailer towing Continuous high speed operation
and or severe usage will normally
cause increased oil consumption

MAINTENANCE AND LUBRICATION 0B-11
SEVERE CONDITIONS MAINTENANCE SCHEDULE (For GENERAL EXPORT)

Severe driving conditions
A : Repeated short trips
G : Gasoline engine
B : Driving on rough roads
4JA1-T : 4JA1-T Diesel engine
C : Driving on dusty roads
4JA1-TC : 4JA1-TC Diesel engine
D : Driving in extremely cold weather and/or on salted roads
4JH : 4JH1-TC Diesel engine
E : Towing trailer or climbing mountain frequently
D
: Diesel engine
MT : Manual transmission

AT : Automatic transmission

4WD
Four wheel drive


Condition
A B C D E A+D
Engine oil G : Change every 5,000 km (3,000 miles) or 3 month4JA1-T : Change every 2,500 km (1,500 miles) 4JA1-TC : Change every 5,000 km (3,000 miles) 4JH : Change every 7,500 km (4,500 miles)



G Replace every 5,000 km (3,000 miles) or 3 month



Engine oil filter
D Replace every 5,000 km (3,000 miles)




Exhaust system Inspect every 5,000 km (3,000 miles)







Air cleaner element Replace every 20,000 km (12,000 miles) D : Inspect every 2,500 km (1,500 miles)


Steering system for looseness
or damage Inspect every 5,000 km (3,000 miles)



Universal joints and sleeves Inspect for wear and lubricate every 5,000 km (3,000
miles)



Transmission or transfer case
oil MT Change every 20,000 km (12,000 miles)
after changing at initial 10,000 km (6,000 miles)


AT Transmission:
Change every 20,000 km (12,000 miles)






4WD Transfer:
Change every 20,000 km (12,000 miles)


Differential oil Change every 20,000 km (12,000 miles)
after changing at initial 10,000 km (6,000 miles)


Front brake pads and discs Inspect every 5,000 km (3,000 miles)




Rear brake lining and drum
wear Inspect every 5,000 km (3,000 miles)






Interval Item

0B-12 MAINTENANCE AND LUBRICATION
SEVERE CONDITIONS MAINTENANCE SCHEDULE (For EUROPE)


Severe driving conditions
4JA1-TC : 4JA1-TC Diesel engine
A: Repeated short trips
4JH : 4JH1-TC Diesel engine
B: Driving on rough roads
D : Diesel engine
C: Driving on dusty roads
MT : Manual transmission
D: Driving in extremely cold weather and/or on salted roads
AT : Automatic transmission
E: Towing trailer or climbing mountein frequently
4WD : Four wheel drive


Condition
Item Interval
A B C D A+D
Engine oil 4JH : Change every 5,000 km (3,000 miles) 4JA1-TC : Change every 7,500 km (4,500 miles)



Engine oil filter 4JH : Replace every 5,000 km (3,000 miles) 4JA1-TC : Replace every 7,5000 km (4,500 miles)




Exhaust pipes and mounting Inspect every 10,000 km (6,000 miles)





Air cleaner element Replace every 20,000 km (12,000 miles)



Steering system for looseness or
damage Inspect every 5,000 km (3,000 miles)




Universal joints and sleeves Inspect for wear and lubricate every 10,000 km (6,000 miles)



Transmission or transmission
with transfer case oil MT Change every 30,000 km (18,000 miles)
after changing at initial 10,000 km (6,000 miles)



AT
Transmission:
Inspection every 20,000 km (12,000 miles)





4WD Transfer:
Change every 30,000 km (18,000 miles)
After changing at initial 10,000 km (6,000 miles)



Differential oil Change every 20,000 km (12,000 miles)
after changing at initial 10,000 km (6,000 miles)


Front brake pads and discs Inspect every 5,000 km (3,000 miles)




Rear brake lining and drum wear Inspect every 5,000 km (3,000 miles)