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Check the Mitsubishi S6R diesel engine gas valve contact surface


Detailed Description:

Check the Mitsubishi S6R diesel engine gas valve contact surface

The inspection of the Mitsubishi S6R diesel engine gas valve contact surface is performed after the Mitsubishi S6R diesel engine gas valve duct is overhauled or replaced. After repairing or replacing the Mitsubishi S6R diesel engine air valve, be sure to perform grinding on the Mitsubishi S6R diesel engine air valve and valve seat.

Check the Mitsubishi S6R diesel engine gas valve contact surface

1.5.1 Measure the margin of the air valve edge of Mitsubishi S6R diesel engine

Measure the margin of the air valve edge of Mitsubishi S6R diesel engine. When exceeding the limit value, modify the Mitsubishi S6R diesel engine air valve or replace it with a new one.

1.5.2 Test valve seat width

Apply a thin layer of inspection agent (lead-free colorant) to the contact surface of the Mitsubishi S6R diesel engine gas valve, and use the Mitsubishi S6R diesel engine gas valve suction cup to check the conformity of the Mitsubishi S6R diesel engine gas valve and valve seat contact surface. When it is found that the contact surface is different or abnormal, or exceeds the limit value, correct or replace the new Mitsubishi S6R diesel engine gas valve or valve seat.

Note: Do not turn the Mitsubishi S6R diesel engine gas valve when the Mitsubishi S6R diesel engine gas valve coated with the contact surface inspection agent (lead-free colorant) is pressed against the valve seat.

Test items

Nominal value

standard value

Limit value

Seat angle

30 °

-

-

Seat width

2.3 mm

2.18 ~ 2.42mm

2.8 mm

Mitsubishi S6R diesel engine air valve margin

3.0 mm

2.8 to 3.2 mm

2.5 mm

Detection seat width

Contact condition between valve seat and Mitsubishi S6R diesel engine air valve

1.6 Trimming the Mitsubishi S6R Diesel Engine Gas Valve Contact Surface

When the surface of Mitsubishi S6R diesel engine gas valve is modified and then used, repair with Mitsubishi S6R diesel engine gas valve surface finisher.

Note: (a) Adjust the surface trimmer of the Mitsubishi S6R diesel engine air valve to the specified angle, and grind the air valve of the Mitsubishi S6R diesel engine.

(b) Do not exceed the margin of the air valve margin of Mitsubishi S6R diesel engine. After grinding and dressing, the Mitsubishi S6R diesel engine gas valve that cannot ensure the specified size should be replaced.

Trimming the Mitsubishi S6R Diesel Engine Gas Valve Contact Surface

1.7 Trimming the valve seat

When the seat surface is damaged or worn, the seat surface is ground.

(1) Use a valve seat reamer or a valve seat grinder to grind the valve seat. After processing, use sandpaper around # 400 to gently grind between the grinder and the valve seat.

When the valve line width of the valve seat exceeds the standard value, use a 44 ° 50 ′ valve seat grinder to grind the inside to adjust.

(2) Polish the air valve and valve seat of Mitsubishi S6R diesel engine.

Note: (a) Repair the valve seat to the minimum.

(b) Replace the valve seat when the width of the valve seat surface exceeds the standard value after repair, or if the contact surface of the Mitsubishi S6R diesel engine gas valve is more outward.

(c) After processing, when the amount of sinking of the Mitsubishi S6R diesel engine's air valve exceeds the limit, replace the valve seat with a new one.

Trimming the seat

1.8 Replace the valve seat

When removing the valve seat, be careful not to damage the machining surface of the cylinder head of the Mitsubishi S6R diesel engine.

1.8.1 Removing a valve seat using a valve seat remover

Use the seat remover to remove the seat.

Remove the seat using the seat remover

1.8.2 Removing the valve seat by welding

Weld bolts to the valve seat, use a shaft rod to insert the Mitsubishi S6R diesel engine gas valve duct hole from the top of the cylinder head of the Mitsubishi S6R diesel engine, and remove the valve seat.

Note: When welding, be careful not to damage the machining surface of the cylinder head of Mitsubishi S6R diesel engine.

Valve seat removal by welding

1.8.3 Installing the valve seat

(1) Before installing the valve seat, first measure the inner diameter of the valve seat mounting part and the outer diameter of the valve seat of the cylinder head of Mitsubishi S6R diesel engine, and confirm whether the interference amount is within the standard value. When the standard value range is exceeded, an oversized valve seat is used. When the inner diameter of the valve seat mounting part of the cylinder head of the Mitsubishi S6R diesel engine exceeds the limit value, the cylinder head of the Mitsubishi S6R diesel engine is replaced with a new one.

Note: The enlarged size of the valve seat is 0.03, 0.06mm.

Valve seat installation

Test items

standard value

Limit value

Note

Inner diameter of valve seat mounting area

60.000 ~ 60.030 mm

60.09mm

-

Mitsubishi S6R diesel engine air valve

Out of seat

path

standard

60.100 ~ 60.130 mm

-

Brown 2 lines

0.03 mm

60.130 ~ 60.160 mm

-

Brown 3 lines

0.06 mm

60.160 ~ 60.190 mm

-

4 lines in brown

Seat interference value

0.070 ~ 0.130 mm

-

-

Inner diameter of the hole in the seat installation part

Applicable valve seat

Below 60.03 mm

standard

Above 60.03 mm

0.03 mm

Above 60.06 mm

0.06 mm

(2) The cylinder head of Mitsubishi S6R diesel engine is at normal temperature, and the valve seat is cooled in liquid nitrogen for more than 4 minutes.

(3) Install the valve seat on the cylinder head of Mitsubishi S6R diesel engine with a special installation tool.

Drive into the seat

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