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Reworking valve seat in the cylinder head and finishing of the valves
Saddles of valves with wear tracks and erosion can be adjusted as long as the maximum size is kept finishing.
If the size of the fine-tuning is exceeded, hydraulic valve clearance compensator will no longer work. In this case it is necessary to replace the cylinder head.
Saddles of valves to bring long until a flawless contact patch. Valve seat rings can be replaced by a conventional factory tools. For fine-tuning needed sweep. Since the handling of this tool requires certain skills, the work must be carried out in the factory.
A warning  Rings saddles exhaust valves have an additional restriction. When finishing a strictly pay attention to the fact that the radius of the restriction has been saved.
Calculation of the maximum allowable size of finishing
| PERFORMANCE ORDER | | 1. Insert valve and press firmly to his seat. |  | 2. Measure the distance (a) between the end of the valve stem and upper edge of cylinder head. | | 3. To obtain the maximum size refinement (b), is necessary to subtract the minimum size (see. Table 1) measured distance (a). |
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Table 1
engine's type | The minimum size, mm | The inlet valve | Exhaust valve | | Gas engine | 33,80 | 34.10 | | Diesel engine | 35.80 | 36,10 |
The seat of the intake valve petrol engine
a. The minimum size
b. The maximum allowable size of debugging (calculated) | z. The lower edge of the cylinder head
thirty. The top angle adjustment
45 ?�. The angle of the valve seat |
The seat of the exhaust valve petrol engine a. The minimum size
b. The maximum allowable size of debugging (calculated) | z. The lower edge of the cylinder head
thirty. The top angle adjustment
45 ?�. The angle of the valve seat |
Angle processing and diameter of the valve seat Gas engine | Inlet valve mm | The exhaust valve, mm | a | 37.2 | 32.4 | from | about 2.0 | about 2.4 |
Angle processing and diameter of the valve seat
Diesel engine | Inlet valve mm | The exhaust valve, mm | a | max 37,2 * | min 33,2 * | at | 34.8 | 30.4 | from | 2.7 | 2.05 |
* Outer diameter of the adjustment cutters The size of the valve
The size of the valve
Engine | Inlet valve mm | The exhaust valve, mm | | Gas engine | a = 40,00 | a = 33,00 | b = 7,97 | b = 7,95 | c = 91.00 | c = 90,80 |  = 45 ?� | = 45 ?� | | Diesel engine | a = 36,00 | a = 31,00 | b = 7,97 | b = 7,95 | c = 95,00 | c = 95,00 | = 45 ?� | = 45 ?� |
A warning The valve drive can not be allowed only lapping.
The size of the cylinder head
| The petrol engine: a = 132.6 mm |
A warning The cylinder head of the diesel engine can not communicate.
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