Isuzu KB P190. Manual — part 224

ENGINE MECHANICAL 6A – 91

IDLER GEAR SHAFT AND IDLER GEAR

Idler Gear "A" Shaft Outside Diameter

Use a micrometer to measure the idler gear shaft outside
diameter.

If the measured value is less than the specified limit, the idler
gear shaft must be replaced.

Idler Gear "A" Shaft Outside Diameter

mm (in)

Standard

Limit

44.945-44.975

(1.7695-1.7707)

44.845 (1.755)

Idler Gear "A" Shaft inside Diameter

1. Use an inside dial indicator or an inside micrometer to

measure the idler gear inside diameter.

Idler Gear Inside Diameter mm

(in)

Standard

Limit

45.0-45.03

(1.7717-1.7718)

45.10 (1.7756)

If the clearance between the idler gear shaft outside diameter
and the idler gear inside diameter exceeds the limit, the idler
gear must be replaced.

Idler Gear Shaft and Idler Gear Clearance

mm (in)

Standard

Limit

0.025-0.085

(0.0010-0.0033)

0.200 (0.0079)

TIMING GEAR CASE COVER

Replace the crankshaft front oil seal if it is excessively worn or
damaged.

Crankshaft Front Oil Seal Replacement

Oil Seal Removal
Use a plastic hammer and a screwdriver to tap around the oil
seal to free it from the gear case cover.

Take care not to damage the oil seal lip surfaces.

020RY00025

014LX022

020R300004

6A – 92 ENGINE MECHANICAL

Oil Seal Installation

Use the special tool to install the front oil seal.

Front Oil Seal Installer: 5-8840-2361-0

1. With the oil seal attached to the sleeve, insert it into the

front end section of the crankshaft.

2. With the oil seal end section attached securely to the

crankshaft, tighten up the center bolt until the sleeve hits
the front end reference plane of the crankshaft securely.

3. Remove the sleeve.

4. With the seal pressed in, check the dimension of the oil

seal section.

Standard Dimension = 1.0

±

0.03mm

NOTE:

Install the oil seal after assembling the timing pulley
housing. The oil seal lip section is applied with oil.

Take notice of the press-in direction of the oil seal.

020R300005

ENGINE MECHANICAL 6A – 93

REASSEMBLY

INTERNAL PARTS

MINOR COMPONENT

ROCKER ARM SHAFT AND ROCKER ARM

020RY00029

Reassembly Steps

1.

Rocker arm shaft

5.

Rocker arm

2.

Rocker arm shaft snap ring

6.

Rocker arm shaft spring

3.

Rocker arm

7.

Rocker arm shaft snap ring

4.

Rocker arm shaft bracket

Reassembly

1. Rocker Arm Shaft

1. Position the rocker arm shaft with the large oil hole (4

φ) facing the front of the engine.

2. Install the rocker arm shaft together with the rocker

arm, the rocker arm shaft bracket, and the spring.

2. Rocker Arm Shaft Snap Ring

3. Rocker

Arm

4. Rocker Arm Shaft Bracket

5. Rocker

Arm

6. Rocker Arm Shaft Spring

7. Rocker Arm Shaft Snap Ring

014RY00037

6A – 94 ENGINE MECHANICAL

CYLINDER HEAD

RTW46ALF001301

Reassembly Steps

1.

Cylinder head

6.

Valve spring upper seat

2.

Valve spring lower seat

7.

Split collar

3.

Valve stem oil seal

8.

Intake manifold gasket

4.

Intake and exhaust valve

9.

Intake manifold

5.

Valve spring