1 - exhaust valve; 2 - exhaust valve seat; 3 - valve guide sleeve; 4 - valve spring plate; 5 – oil deflector cap; 6 - valve spring; 7 - valve spring holder; 8 - crackers; 9 - crackers; 10 - valve spring holder; 11 - valve spring; 12 – oil deflector cap; 13 - valve spring plate; 14 - valve guide sleeve; 15 - inlet valve seat; 16 - inlet valve.
Withdrawal
1. Using a special tool, compress the valve spring and remove the crackers from the valve stem. Slowly release the spring compressor and remove the valve spring, spring cap and valve from the cylinder head.
Warning! Have numbered plastic bags or containers ready to store the valves.
2. Remove the oil cap with pliers.
Warning! Do not reuse the oil seal.
Examination
Valve spring
1. Inspect each valve spring for cracks or damage.
2. Measure the free length of the spring. Place the spring on a flat horizontal surface and measure the deviation of the top of the spring from the vertical plane.
- Spring free length: 42.03 mm
- Spring length under load 24.7 kg: 34.5 mm
- The maximum permissible deviation of the spring from the vertical plane - no more than 1.5°
Valve guides
Check clearance between valve stem and valve guide. If the clearance exceeds the limit, replace the valve guide with an oversized bushing.
Clearance between stem and valve guide:
- Inlet valves: 0.03–0.06 mm
- Exhaust valves: 0.035-0.065 mm
Maximum allowable clearance between valve stem and valve guide:
- Inlet valves: 0.1mm
- Exhaust valves: 0.15mm
Oversized valve guide
Size increase, mm | Dimension mark | Bore diameter in the cylinder head, mm |
0,05 | 5 | 11,05–11,058 |
0,25 | 25 | 11,25–11,258 |
0,35 | 50 | 11,50–11,508 |
Valve seat
Check the condition and width of the valve seat lip. Repair or replace the valve seat if necessary.
Before replacing or repairing the valve seat, check the valve guide for wear. If the valve guide is worn, replace it.
Repair of the valve seat must be carried out with an emery wheel or cutter. The width of the chamfer of the valve seat must be within the specifications.
Valve
1. Inspect each valve for the following defects:
- damage or deformation of the valve stem;
- valve disc damage;
- damage or uneven wear to the end of the valve stem.
2. Repair or replace the valve if necessary.
Edge Thickness:
- Inlet valves: 1.1mm
- Exhaust valves: 1.4mm
Maximum allowable edge thickness:
- Inlet valves: 0.8mm
- Exhaust valves: 1.1mm
Installation
Warning! Clean all parts before installation.
Warning! Apply a thin coat of engine oil to all sliding surfaces.
1. Using special tool 09222-22001, install the oil seal.
2. Lubricate the valve stem with engine oil and install the valve. When installing the valve, do not apply much force so as not to damage the oil seal.
3. Install springs and spring retainers. The springs must be installed with the enameled side towards the spring holders.
4. Compress the spring with the special tool. Install crackers and remove the special device for spring compression.
5. Install the cylinder head.