- Inlet valve1 — 2 0.20-0.30 mm
- Exhaust valve1 - 0.40-0.50 mm
- Inlet valve2 - 0.15-0.25 mm
- Exhaust valve2 - 0.35-0.45 mm
1 Adjustment but with a warm engine.
2 Adjustment but a cold engine after repair work.
As part of maintenance, checking and, if necessary, adjusting valve clearances should be carried out when the mileage reaches 15,000 km, 30,000 km and then every 30,000 km. Checking and, if necessary, adjusting valve clearances must be carried out after repairing the cylinder head (after 1000 km after repair).
Adjustment of valve clearances brings the desired success only when the valves provide good sealing, their play in the guide bushings does not exceed the maximum allowable value, and the ends of the rods are not worn out.
If the gap is too small, the valve timing changes, compression worsens, engine power decreases, the engine runs unevenly. In extreme cases, valves can be deformed or valve seats burned.
With increased clearances, strong mechanical knocks occur, the valve timing changes due to a decrease in the valve opening time and thereby deterioration in the filling of the cylinders, the engine power decreases, the engine runs unevenly.
To adjust the valve clearances, shims are available with a thickness of 3.00 mm to 4.25 mm. The thickness of the washer is indicated on its underside. When installing, be sure to install the washer so that the thickness marking is at the bottom, that is, facing the pusher.
Adjusting washers and their numbers according to the spare parts catalog:
Thickness, mm | Detail number | Thickness, mm | Detail number |
3,00 | 056109555 | 3,65 | 056109568 |
3,05 | 056109556 | 3,70 | 056109569 |
3,10 | 056109557 | 3,75 | 056109570 |
3,15 | 056109558 | 3,80 | 056109571 |
3,20 | 056109559 | 3,85 | 056109572 |
3,25 | 056109560 | 3,90 | 056109573 |
3,30 | 056109561 | 3,95 | 056109574 |
3,35 | 056109562 | 4,00 | 056109575 |
3,40 | 056109563 | 4,05 | 056109576 |
3,45 | 056109564 | 4,10 | 056109577 |
3,50 | 056109565 | 4,15 | 056109578 |
3,55 | 056109566 | 4,20 | 056109579 |
3,60 | 056109567 | 4,25 | 056109580 |
Adjusting washers that have already been in use can be reinstalled if they are not mechanically damaged.
Adjustment
Remove the air filter.
The gaps are adjusted in the following order: 1st, 3rd, 4th and 2nd cylinder. The 1st cylinder is located on the flywheel side.
Remove the top casing of a gear belt.
Remove the cylinder head cover.
crankshaft (and thus the camshaft) key head for flywheel (it is also possible to turn the crankshaft by moving the car in 4th gear) to the position when the pair of cams of the adjustable cylinder will stand up (while the cams are arranged symmetrically obliquely). At the same time, this pair of cams does not rest against the shims.
Attention! Do not rotate the engine by the camshaft sprocket bolt, as this will overload the toothed belt.
Measure the valve clearance with a feeler gauge set.
Attention! The sequence of valves, starting from the flywheel: 1st cylinder: exhaust valve - intake valve; 2nd cylinder:, exhaust valve - intake valve; 3rd cylinder: intake valve - exhaust valve; 4th cylinder: intake valve - exhaust valve. The feeler gauge should slide in and out between the cam and shim with an interference fit.
Follow the measurement sequence for the intake and exhaust valves and record the valve clearances determined with feeler gauges.
Before installing the tensioner, rotate the plunger so that the pliers can grip the notches after compression. Sometimes shims are glued, in which case they should be blown out with compressed air.
Attention! Turn the crankshaft about 1/4 turn against the direction of engine rotation before installing the turnbuckle so that the valves do not rest against the pistons when the tappets are pushed in. By reverse rotation, the pistons are retracted from the top dead center position.
Adjust valve clearances. To do this, service stations use special devices 2078 and 10-208, which are produced in similar versions by other tool companies (e.g. HAZET). Valve clearance cannot be adjusted without this toohp the help of the device, the pusher is pressed down. Using pliers, the adjusting washer is pulled out.
Insert an adjusting washer of the required thickness.
Attention! The marking on the washer must be on the underside.
Remove the recessing tool 2078 and rotate the camshaft.
Adjust valve clearances for cylinder No. 3, etc.
Attention! With increasing mileage, valve clearances decrease, that is, the installed shim becomes too thick and must be replaced with a thinner one.
Example for Checking Washer Thicknesses
Inlet valve | Exhaust valve | |
Given (adjusting) values, mm | 0,45±0,05 | 0,25±0,05 |
Measured values, mm | 0,35 | 0,35 |
Clearance on | 0.05 mm small | 0.05 mm large |
Existing shim | 4.05mm | 3.65mm |
Required (to get the average) shim | 3.95mm | 3.75mm |
If the values are within tolerance, the shims need not be replaced. If the tolerance is exceeded, the adjusting washers should be replaced, while striving for an average value - for example, 0.25 mm.
Attention! If, despite the installation of a thinner shim 3.0 mm thick, the valve clearance cannot be corrected (due to valve seat correction), shorter valves should be installed.
Install the cylinder head cover with new gaskets.
Establish the top casing of a gear belt.
Install the air filter.
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