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Measuring John Deere's diesel engine cylinder head valve sinking


Detailed Description:

Measure John Deere John Deere Diesel Engine Cylinder Head Valve Sinking

1. Measure and record the valve sinking amount (A) with a depth dial indicator, a magnetic dial indicator, or a dial indicator equipped with a JDG451 altimeter (B). The measurement position must start from the valve edge and be up to 3.0 mm (0.12 inch).

2. Compare the measurement results of two intake valves for each cylinder. The deviation must not exceed the maximum value allowed by the technical specifications. Repeat this measurement for the two exhaust valves of each cylinder.

3. If the valve of each cylinder is not worn uniformly, check the deviation from the notch of the rocker arm to the notch. (See the "Inspecting and Measuring Valve Connections" section earlier in this chapter.)

Technical specifications

Intake valve-sinker head.... 0.77-1.27 mm (0.030-0.050 inch)

Minimum wear limit ... 1.77 mm (0.070 inch)

Exhaust Valves-Cylinder Head Sinking... 0.81 to 1.31 mm (0.032 to 0.052 inches)

Minimum wear limit ... 1.81 mm (0.071 inch)

Intake and Exhaust Valves-Maximum Deviation for Each Pair of Valves (per Cylinder)... 0.3 mm (0.012 inch)

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.

If necessary, install a new valve and / or valve seat ring so that the valve sinks to the specifications.

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