2004 ISUZU TF SERIES Workshop Manual

Page 1169 of 4264

ISUZU TF SERIES 2004  Workshop Manual ENGINE MECHANICAL   6A – 29 
 
 
 Thermostat Operating Test 
1.  Completely submerge the thermostat in water. 
2.  Heat the water. 
Stir the water constantly to avoid direct heat being 
applied to t

Page 1170 of 4264

ISUZU TF SERIES 2004  Workshop Manual 6A – 30  ENGINE MECHANICAL 
 
 
Cooling Fan Pulley Drive Belt 
Fan belt tension is adjusted by moving the generator. 
Depress the drive belt mid-portion with a 98N (10 kg/22 lb) 
force. 
Cooling Fan

Page 1171 of 4264

ISUZU TF SERIES 2004  Workshop Manual ENGINE MECHANICAL   6A – 31 
 VALVE CLEARANCE ADJUSTMENT 
1.  Bring the piston in either the No. 1 cylinder or the No. 4 
cylinder to TDC on the compression stroke by turning 
the crankshaft until t

Page 1172 of 4264

ISUZU TF SERIES 2004  Workshop Manual 6A – 32  ENGINE MECHANICAL 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
COMPRESSION PRESSURE 
MEASUREMENT 
1.  Start the engine and allow it to idle until the c

Page 1173 of 4264

ISUZU TF SERIES 2004  Workshop Manual ENGINE MECHANICAL   6A – 33 
INJECTION TIMING ADJUSTMENT 
 (4JA1T(L) only) 
1.  Check that the notched line on the injection pump 
flange is aligned with the front plate or the timing gear 
case not

Page 1174 of 4264

ISUZU TF SERIES 2004  Workshop Manual 6A – 34  ENGINE MECHANICAL 
   
 
 
RTW46ASH000701  
9.  Turn the crankshaft clockwise and read the gauge 
indication when the crankshaft pulley timing mark (8) 
is aligned with the pointer. 
 
Inj

Page 1175 of 4264

ISUZU TF SERIES 2004  Workshop Manual ENGINE MECHANICAL   6A – 35 
Fast Idling Speed Inspection 
1.  Set tachometer to the engine. 
2.  Disconnect the vacuum hose 
 from the fast idle 
actuator 
 on the injection pump. 
3.  Disconnect

Page 1176 of 4264

ISUZU TF SERIES 2004  Workshop Manual 6A – 36  ENGINE MECHANICAL 
GENERAL DESCRIPTION 
 
 
 
 
 
 
 
 
 
 RTW46AMF000401 
 
The 4J series automotive diesel engine has special designed combustion chambers in the piston. This design 
prov