Technical data
1. Cylinder head
Cylinder head height mm: H = 113.5.
Maximum permissible deformation of the mating surface, mm: 0.05.
Volume of combustion chamber with valves and spark plug, cm³: 26.25±0.6.
2. Valve guide bushings
Nominal internal diameter, mm: 7.
Nominal diameter of the socket in the cylinder head, mm: 12.
Caution! The intake and exhaust valve guides have valve stem oil seals that must be replaced each time the valve drive mechanism is disassembled.
Source is located on the website www.RenaultBook.ru
Inclination of the intake and exhaust valve guide bushings: β = 17°.
Position of the intake and exhaust valve guide bushings relative to the lower bearing ends of the valve springs (without bottom plate), mm: A = 12.
3. Valve springs
Nominal size (black)
Length in free state, mm: 46.64
Length under load, mm:
- 270 H 37;
- 536 H 27.5.
Length of spring with full compression of coils, mm: 23.63;
Wire diameter, mm: 3.8
Inner diameter, mm: 21.5.
Repair size (orange)
Length in free state, mm: 44.93;
Length under load, mm:
- 270 H 37;
- 650 N 27.6.
Length of spring with fully compressed coils, mm: 26.01.
Wire diameter, mm: 4
Inner diameter, mm: 21.5.
4. Valves
Rod diameter, mm: 7
Working chamfer angle:
- inlet valve: 120°;
- exhaust valve: 90°.
Head diameter, mm:
- inlet valve: 37.5±0.1;
- outlet valve: 33.5±0.1.
Caution: When replacing valves, the new valves installed must have the same part number 1 as the previous valves to prevent damage to the valves and seats.
The same part number may have several markings, in which case all valves are completely interchangeable.
Make sure that new valves with markings different from those of the removed valves have the same part number.
5. Valve seats
Working chamfer angle:
- Inlet valves α = 120°.
- Exhaust valves α = 90°.
- Width of the working chamfer of the saddle, mm.
- Inlet valves X = 1.7+0.1.
- Exhaust valves X = 1.7±0.1.
- Outer diameter of seat D, mm.
- Inlet valves 38.5.
- Exhaust valves 34.5.
6. Camshaft
Axial clearance, mm: 0.06-0.15.
Number of bearings: 5.
7. Parts that must be replaced when removed:
- All sealing cuffs and gaskets.
- Valve guide bushings.
- Camshaft pulley mounting bolt.
- Cylinder head mounting bolt.
Disassembly
1. Remove the cylinder head (see section "Cylinder head gasket").
2. Remove the rocker arm axle mounting bolts and the rocker arm axle, having first marked the position of the rocker arms and bolts on it:
- B - solid bolts;
- C - hollow bolts.
3. Remove:
- camshaft oil seal;
- camshaft thrust flange.
4. Remove the camshaft.
5. Remove the thermostat housing.
6. Remove the spark plugs.
7. Remove the camshaft timing pulley after securing it with tool Mot 799-01.
8. Compress the valve springs (for example, with the FAC U43L device). Remove crackers, upper plates, springs, valves, oil seals with a valve stem, using special pliers 1335 and lower plates.
9. Clean the cylinder head and check the mating surface for deformation (see "Cylinder head gasket").
Grinding valve seats
Inlet valves X = 1.7 ±α = 120°.
Grind the working chamfer of shaft 1 using a cutter with an angle of 31°, reduce the width of the working chamfer by processing the chamfer with a cutter with an angle of 75° until a width of X is obtained.
Exhaust valves X = 1.7 ±α = 90°.
Grind the working chamfer of shaft 1 using a cutter with an angle of 46°, reduce the width of the working chamfer by processing it with a cutter with an angle of 65 until the width X is obtained.
Attention! Check that the valve fits correctly on the seat (figure 3.47).
Assembly
1. Lubricate all parts.
2. Install the lower valve spring retainers.
3. Using a 11 mm socket wrench, install the oil seals 2 onto the valve guide bushings 3.
4. Install:
- new valves 4;
- springs 5 (the same for intake and exhaust valves);
- top plates 6.
5. Compress the springs.
6. Install crackers 7 (the same for intake and exhaust valves).
7. Lubricate the camshaft.
8. Install the camshaft and its thrust flange.
9. Check the axial clearance, which should be 0.06-0.015 mm, if this is not the case, the cause is the flange or camshaft.
10. Install the oil seal using the installation tool lot. 1127-01, which allows you to shift the contact points of the working edge of the oil seal on the camshaft.
11. Install the thermostat housing, sealing it with Loctite 518. The bead of sealant H should be 0.6 to 1 mm wide (figure 3.51).
12. Install the camshaft pulley, securing it with tool Mot. 799-01 and tightening the bolt to a torque of 45 Nm (lubricate the threads and the surface under the bolt head with oil).
13. Check the condition of the roller surfaces and rocker arm bolts. Make sure that the lubrication holes of the rocker arm cams and heels are not clogged. Replace worn parts. Install the rocker arm shaft so that mark 1 faces the timing gear.
Note: Bolts A are available in two sizes M8 x 100 and M8 x 125.
Install the rocker arm axle mounting bolts 2 and tighten them to a torque of 23 Nm, after lubricating the threads and surfaces under the bolt heads with engine oil.