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Products
John Deere Qianglu Diesel Gas Valve Conduit


Detailed Description:

John Deere Strong Deer Diesel Engine Gas Valve Conduit

Use telescopic inner diameter to measure valve tube wear.

Technical specifications

Valve Conduit Holes (New)-Inner Diameter .. 7.025-7.051 mm (0.276-0.277 inch)

Intake valve conduit to stem (new)-clearance ... 0.012-0.064 mm (0.0005-0.0025 inch)

Exhaust valve conduit to stem (new)-clearance ... 0.025-0.077 mm (0.0010-0.0030 inch)

Intake and Exhaust Valve Conduit to Stem (Wear Limit)-Clearance. 0.15 mm (0.0059 inch)

If the valve conduit and stem oil gap exceeds the wear limit but is less than 0.20 mm (0.008 inch), allow the valve conduit to be knurled and then machined to the required size with a reamer. (See the "Knurling of Valve Conduit" section later in this chapter.)

Important note: When manufacturing the valve catheter, there was an M7-1 modified long-stripe internal catheter with a main diameter of 7.172-7.248 mm (0.2823-0.2853 inches). Threads must be inside diameter over the length of the catheter, and 7.016 x 75 mm (0.2762 x 2.95 inch) pins must pass freely through the catheter. After reaming, go to a certified service station and select a threaded valve conduit.

Ground valve seat

Important Note: In order to ensure the neat arrangement of valve connections, the intake valve, exhaust valve, valve seat ring, spring and retaining ring must be replaced in pairs. In addition, the replacement of any of the above components should also be replaced at the same time.

Do not grind the valve seat. If the valve seat surface is pitted, burned, worn, or damaged, the intake or exhaust valves should be replaced in pairs.

Remove the valve seat ring

Important note: When removing the valve seat, be careful not to damage the cylinder head. The valve seat can only be removed by experienced personnel who are familiar with the operating procedures.

Do not use a torch to remove the valve ring, as this will change the hardness of the cylinder head.

The cylinder head inserts are made of fused (powder) metal. The insert can only be removed in one of the following ways

John Deere John Deere diesel engine measures valve seat holes in cylinder head gas

Check whether the size of the inner hole of the valve seat meets the requirements of the following technical specifications of the machine cylinder head:

Cylinder head valve seat hole

Exhaust valve seat ring hole technical specifications:

A. 36.436-36.462 mm (1.4344-1.4355 inches)

B. 2.34 mm (0.092 inch) reference

C. 8.715-8.785 mm (0.3431-0.3458 inches)

D. 38-42 °

E. Maximum radius of 0.5 mm (0.019 inches)

"A" hole maximum surface finish 3.2 (micron) inlet valve seat ring hole technical specifications:

A. 37.436-37.462 mm (1.4738-1.4748 inches)

B. 2.8 mm (0.110 inch) reference

C. 9.215-9.285 mm (0.3627-0.3655 inches)

D. 38-42 °

E. Maximum radius of 0.5 mm (0.019 inches)

Maximum surface finish of "A" hole 3.2 (microns)

Replacement valve seat ring outer diameter:

Intake ... 37.487-37.513 mm (1.476-1.477 inches)

Exhaust ... 36.487-36.513 mm (1.436-1.437 inches)

Install the valve seat ring

Important Note: In order to ensure the neat arrangement of valve connections, the intake valve, exhaust valve, valve seat ring, spring and retaining ring must be replaced in pairs. In addition, the replacement of any of the above components should also be replaced at the same time.

1. Install the cylinder head valve seat hole insert with JDG1653-1 valve seat hole remover (A) and JDG1653-2 valve seat hole inserter (B). Use one end of the JDG1653-2 valve seat installer to install the inlet valve seat insert and the other end to install the exhaust valve seat insert.

2. Install the valve and measure the amount of valve sinking. (See the "Measurement of Cylinder Head Valve Sinking" section earlier in this chapter.)

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