Isuzu engine C22NE / 22LE / 20LE. Service manual - part 16

6A-46 ENGINE MECHANICAL (C22NE, 22LE, 20LE)

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 (C22NE, 22LE, 20LE) 6A-47

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.

6A-48 ENGINE MECHANICAL (C22NE, 22LE, 20LE)

Inspection

Check contact pattern (

I

) on valve seat and in cylinder head.

Clean

Valves, valve guides, cylinder head.

Flywheel

Removal

1.

Remove transmission and clutch.

2.

Remove flywheel while locking with 5-88400-446-0.

Torque - Angle Method

Flywheel to crankshaft - 65 Nm/6.5 kgf

⋅

m.+30

°

 to 45

°

Important!

Use new bolts.
Do not apply grease to the thread.

Installation

1.

Install clutch and transmission.

Component Parts

Flywheel and Ring gear. (Manual Transmission)

ENGINE MECHANICAL (C22NE, 22LE, 20LE) 6A-49

Starter Ring Gear (Manual Transmission)

Removal

1.

Remove flywheel according to the corresponding
operation.

2.

Drill starter ring gear underneath tooth gap approx.
8mm/0.30in. deep with 8mm/0.25in. diameter drill.

3.

Separate starter ring gear with chisel on the drilling point.

Installation

1.

Install starter ring gear with inner chamfered edge to
flywheel.

2.

Heat starter ring gear evenly to 180

°

C /356

°

F to 230

°

C

/446

°

F (yellow paint mark)

3.

Install flywheel according to the corresponding operation.

Inspection

Lateral run-out of starter ring gear - max. 0.5mm/0.02in.