Isuzu KB P190. Manual - part 514

6A-42 ENGINE MECHANICAL (C24SE) 

 

 

Installation 

  1.  Install the fastening bolts. 

  2.  Loosen the lower alternator fastening bolt. 

  3.  Install the alternator, power steering and V-belts. 

 

 

 

 

 

Cylinder Head, Disassemble and Assemble 

Removal 

  1.  Remove the hydraulic valve lifters. 

   

Lay aside in installation positions. 

  2.  Remove the spark plugs, exhaust manifold and intake 

manifold from cylinder head. 

 

 

 

 

 

Removal 

 1.  Mark valves. 

  2.  Remove the tension valve springs with 5-8840-2594-0 

(1). 

  3.  Remove valve keepers, valve spring cap and valve 

spring. 

 

 

 

Removal 

  1.  Remove the valve and valve stem seal. 

  2.  Remove the valve spacer ring (1-exhaust) and valve 

spring seat (2-intake). 

  3.  Remove valve from cylinder head. 

 

Clean 

Sealing surfaces. 
 

ENGINE MECHANICAL (C24SE) 6A-43 

 

 

Inspection 

Sealing surfaces for plane surface, guides, sliding and bearing 
points for wear-see operation “Cylinder Head. Overhaul”. 
 

 

 

Installation 

  1.  Coat the valves with engine oil and insert in cylinder 

head. 

  2.  Install the valve spacer ring or valve rotator(exhaust) and 

valve spring seal(intake). 

  3.  Push the accompanying assembly sleeve onto valve 

stem and coat with engine oil. 

  4.  Insert a new valve stem seal with 5-8840-2601-0 (1). 

  5.  Drive the valve stem seal carefully in to stop with light 

hammer blow. 

 

 

 

 

 
 
 

 

Installation 

  1.  Install the valve springs and valve spring caps. 

  2.  Install the tension valve springs with 5-8840-2594-0 (1), 

valve keeper. 

 

Important! 

Note markings made on valves. 
 

 

 

 

 

Tighten (Torque) 

Exhaust manifold and intake manifold with new gaskets to 
cylinder head. 
 
Thermostat housing with new seal ring to cylinder head: 
 

 

 
 

 

Tighten (Torque) 

Spark plugs with spark plug wrench to cylinder head. 
 

Installation 

  1.  Coat hydraulic valves lifters (1) with oil. 

  2.  Insert them in cylinder head. 

   

Note installation position. 

 

6A-44 ENGINE MECHANICAL (C24SE) 

 

 
 
 
 
 

 

 

Valve, Grind 

Valves can be reused once or twice after regrinding-only if 
there are no crater-like burns on the valve cone. 
Excessive grinding can cause the upper valve head edge to 
become too thin. 
 

Important! 

Valve stem protection must not exceed dimension “A”-use 5-
8840-2596-0. 
Do not regrind valve stem ends. 
For all valve reworking note that angle of valve head is 44

° and 

the valve seat 45

°-see also “Technical Data”. 

 

 

 

 

 
 
 
 

 

 

 

 

Valve, Grind In 

Grind-In the valve to improve valve seating. 
Grind-In by rhythmically lifting valves and turning uniformly. 
Use commercially available grinding tool. 
 

Important! 

Use only fine-grained pastes for grinding. 
Lubricate valve stem before grinding in. 
 

Clean 

After grinding, carefully clean valve and valve soat. 
 

 

 

 

 

 
 
 

Valve Guide, Ream 

Measure 

Diameter of valve guide-dial gauge and internal measuring 
instrument. 
 

Important! 

Valve oversizes are available ex-works. 
Oversize identification, on the valve guide and on the valve 
stem end with the following specified identificaton 
flgures/letters-see also “Technical Data”. 
 

 

 
 

Identification Mark 

Size Production 

Customer 

Service 

Reamer 

 
Normal none 

K 

0.075 mm 

1 

K1 

0.150mm 2 

K2 

 
Ream valve guide from the upper side of the cylinder head to 
the next oversize (use 5-8840-2599-0). 
After reaming, cross out identification mark and stamp in new 
identification mark. 
 

ENGINE MECHANICAL (C24SE) 6A-45 

 

 

 

 
 

Valve Seating, Mill 

Place cylinder head on block of wood. 
Inlet and exhaust, Guide Drift and Valve Seat Cutter 5-8840-
2593-0. 
Valve seat-45

°, side face, upper correction-30°, side face 

(arrows on cutter). 
Valve seat width: 
 
Inlet-1.0 to 1.5 mm/0.04 to 0.06 in. 
Exhaust-1.7 to 2.2 mm/0.072 to 0.088 in. 
 

 

 
 

Inspection 

Valve stem projection-use 5-8840-2596-0. 
 

Important! 

If dimension “A” is exceeded, use new valves. 
Check valve stem projection again. If dimension “A” is 
exceeded, replace cylinder head. 
 
 

 

 
 
 

 

 

Cylinder Head, Overhaul 

Cylinder head disassembled. 
 

Valve, Grind 

Important! 

Ensure that there are no crater-like burns on the valve cone. 
 
Regrinding possible once or twice. 
Grinding of valve stem end is not permitted. 
 
Angle at valve head-44

° 

 

 

 

 

Inspection 

Check valve stem projection as shown 5-8840-2596-0. 
 

 
 

Valve, Grind in 

Lubricate valve stem, use fine-graining grinding paste. 
 
Lift up valve from seat rythmically using valve grinding tool (1) 
for distribution of grinding paste.