If the rework size is exceeded, the hydraulic valve clearance compensator will no longer work. In this case, it is necessary to replace the cylinder head.
Adjust valve seats until a perfect contact patch is obtained. Valve seat rings can be replaced with normal factory tooling. For fine-tuning, sweeps are needed. Since the handling of this tool requires certain skills, work must be done in the factory.
Attention! The exhaust valve seat rings are further tapered. When finishing, pay close attention to the fact that the tapering radius is maintained.
Calculation of the maximum allowable finishing dimensions
1. Insert the valve and press it firmly against the seat.
2. measure distance (A) between the end of the valve stem and the top edge of the cylinder head.
3. In order to get the maximum allowable finishing size (b), it is necessary to subtract the minimum size (see table 1) measured distance (A).
Table 1
engine's type | Minimum size, mm | |
Inlet valve | Exhaust valve | |
Gas engine | 33,80 | 34,10 |
diesel engine | 35,80 | 36,10 |
Gasoline inlet valve seat
a. Minimum size; b. The maximum allowable finishing size (calculated); z. Lower edge of the cylinder head; 30°. Upper corner adjustment; 45°. Valve seat angle
Gasoline exhaust valve seat
a. Minimum size; b. The maximum allowable finishing size (calculated); z. Lower edge of the cylinder head; 30°. Upper corner adjustment; 45°. Valve seat angle
Machining angle and valve seat diameter
Gas engine | Inlet valve, mm | Exhaust valve, mm |
A | 37,2 | 32,4 |
With | about 2.0 | about 2.4 |
Machining angle and valve seat diameter
diesel engine | Inlet valve, mm | Exhaust valve, mm |
A | max 37,2 * | min 33,2 * |
V | 34,8 | 30,4 |
With | 2,7 | 2,05 |
* outer diameter of the corrective cutter
Valve dimensions
Engine | Inlet valve, mm | Exhaust valve, mm |
Gas engine | a = 40.00 | a = 33.00 |
b = 7,97 | b = 7,95 | |
c = 91.00 | c = 90,80 | |
α = 45° | α = 45° | |
diesel engine | a = 36,00 | a = 31,00 |
b = 7,97 | b = 7,95 | |
c = 95.00 | c = 95,00 | |
α = 45° | α = 45° |
Attention! The valve must not be adjusted, only lapping is allowed.
Head size
Gasoline engine: a = 132.6 mm
Attention! The cylinder head of a diesel engine must not be adjusted.
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