Note:
Valve head band thickness:
- inlet: 1.75-1.95 mm
- outlet: 1.95-2.15 mm
2. Use a caliper to measure the length of each valve. If the measured value is less than normal, replace the valve with a new one.
Note:
Standard valve length:
- Inlet: 107.00-107.60 mm.
- Release: 117.09-117.69 mm.
Minimum valve length:
- Inlet: 106.78 mm.
- Release: 116.87mm.
3. Using a micrometer, measure the diameter of the valve stem in six positions in two mutually perpendicular directions (X and Y) at three points along the length of the rod (A, B and C), as it shown on the picture. If the measured values are not correct, replace the valve with a new one.
Note:
Standard valve stem diameter:
- Inlet: 5.470-5.485 mm
- Outlet: 5.465-5.480 mm
Minimum valve stem diameter:
- Inlet: 5.424 mm
- Outlet: 5.419 mm
4. Using an inside micrometer, measure the inside diameter of the valve guide in six positions - in two mutually perpendicular directions (X and Y) at three points along the length of the guide sleeve (A, B and C), as it shown on the picture. If the measured values are not correct, replace the valve guide with a new one.
Note:
Standard valve guide inner diameter:
- Inlet: 5.510-5.530 mm.
- Release: 5.510-5.530 mm.
5. Calculate the clearance between the valve stem and guide sleeve by subtracting the valve stem diameter from the inside diameter of the guide sleeve. If the value obtained exceeds the limit, replace the valve or valve guide with new ones.
Note:
Standard clearance between valve stem and guide sleeve:
- Inlet: 0.025-0.060 mm
- Release: 0.030-0.065 mm
The maximum allowable gap between the valve stem and the guide sleeve: 0.10 mm.
6. Using a caliper, measure the height of the protrusion (size A) valve guides. If the measured value is not correct, replace the valve guide.
Note: Standard valve guide protrusion (inlet/outlet): 16.4-17.0 mm.
