Isuzu KB P190. Manual — part 361

6A-84 ENGINE MECHANICAL (4JK1/4JJ1)

Manifold Fitting Face Warpage

mm (in)

Standard

0.05 (0.002) or less

Limit 0.20

(0.008)

Maximum Grinding Allowance

0.40 (0.016)


RTW56ASH017501

Exhaust Manifold Warpage

Use a straight edge and a feeler gauge to measure the
manifold cylinder head fitting face warpage.

If the measured values exceed the specified limit, the
manifold must be replaced.

Exhasut Manifold Warpage

mm (in)

Standard

0.05 (0.002) or less

Limit 0.20

(0.008)





027RY00002

Valve Stem Cap

Make the necessary part replacements.

If excessive wear or damage is discovered during
inspection.

Valve Stem Outside Diameter

Measure the valve stem diameter at three points.

If the measured value is less than the specified limit, the
valve and the valve guide must be replaced as a set.

Valve Stem Outside Diameter

mm (in)

Intake Valve

Exhaust Valve

Standard

6.955 – 6.970

(0.2738 – 0.2744)

6.939 – 6.949

(0.2732 – 0.2736)

Limit

6.935

(0.2730)

6.920

(0.2724)




011LX027

Valve Stem and Valve Guide Clearance

1. Measure the valve stem outside diameter.

Refer to the item “Valve Stem Outside Diameter”.

2. Use a caliper calibrator or a telescoping gauge to

measure the valve guide inside diameter.

If the measured values exceed the specified limit,

the valve and the valve guide must be replaced as

a set.

Valve Stem Clearance

mm (in)

Intake Valve

Exhaust Valve

Standard

0.039 – 0.071

(0.0015 – 0.0028)

0.064 – 0.096

(0.0025 – 0.0038)

Limit

0.200

(0.008)

0.250

(0.0098)

ENGINE MECHANICAL (4JK1/4JJ1) 6A-85



011RY00023

Valve Thickness

Measure the valve thickness.

If the measured value is less than the specified limit, the
valve and the valve guide must be replaced as a set.

Intake and Exhasut Valve Thickness

mm (in)

Standard 1.32

(0.052)

Limit 1.1

(0.043)




014RY00020

Valve Depression

1. Install the valve (1) to the cylinder head (2).

2. Use a depth gauge or a straight edge with steel

rule to measure the valve depression from the

cylinder head lower surface.

If the measured value exceeds the specified limit,

the valve seat insert must be replaced.

Valve Depression

mm (in)

Standard 1.8

(0.07)

Limit 2.5

(0.098)





014RY00021

Valve Contact Width

1. Check the valve contact faces for roughness and

unevenness. Make smooth the valve contact

surfaces.

2. Measure the valve contact width.

If the measured value exceeds the specified limit,

the valve seat insert must be replaced.


Valve Contact Width

mm (in)

Intake Exhaust

Standard

1.7 (0.067)

2.0 (0.079)

Limit

2.2 (0.087)

2.5 (0.098)


6A-86 ENGINE MECHANICAL (4JK1/4JJ1)




014RY00027

Repair of the seat surface

• Remove carbon from the surface of the valve

insert seat.

• Use a seat cutter to minimize the scratch and

other roughness (15/45/75 degree-blade), thereby

returning the contact width to the standard value.


LNW21BSH018201

Note:
Remove only scratches and roughness, and do not cut
the surface too much.
Use the free adjustment valve cutter pilot.

Do not let the valve cutter pilot waver inside the valve
guide.


Valve Seat Angle

Degree

45


LNW21BSH056101

• Attach compound in the valve insert seat.
• Insert the valve into the valve guide.
• Attach compound on the valve seat surface, rotate

the valve and hit it lightly to grind it, and confirm

that it has even contact all round.

Note:
Remove compound completely after grinding.

LNW21BSH031801

ENGINE MECHANICAL (4JK1/4JJ1) 6A-87

Remove the valve seat insert

• Arc-weld the entire inner diameter of the valve seat

insert.

• Cool the valve seat insert for two to three minutes.

Contraction due to cooling makes it easier to

remove the valve seat insert.

• Remove the valve seat insert, using a screw

driver . Be sure not to harm the cylinder head.

LNW21BSH056001

Legend

1. Arc-Weld

2. Valve Seat Insert

3. Screw

Driver

Install the valve seat insert

• Carefully place a washer (the outer diameter is

smaller than the valve seat insert) on the valve

seat insert.

• Use the press to apply pressure gradually on the

washer, thereby pushing the valve seat insert.

Note:
Do not apply too much pressure with the press. Attach
compound on the valve seat surface, rotate the valve
and hit it lightly to grind it, and confirm that it has even
contact all round.


LNW21BSH018601

Legend

1. Attach

Compound

2. Valve

Seat

3. Press

Reassembly

1. Install the oil seal.

• Install on the surface of the injection pipe insert.
• Hammer it in so that the seal does not incline.

Note:
Be sure not to harm the lip.

Special tool

Injection pipe oil seal installer: 5-8840-2820-0

RTW56ASH008801

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Политика конфиденциальности