Rated value | Inlet valve: | 0.15-0.25mm |
Exhaust valve: | 0.40-0.50 mm |
After repairing the cylinder head, the valve clearance must be adjusted with a cold engine.
Rated value | Inlet valve: | 0.15-0.25mm |
Exhaust valve: | 0.35-0.45mm |
The valve clearance must be checked and, if necessary, corrected every 15,000 km. It is carefully checked and, if necessary, adjusted after the repair of the cylinder head (after 1000 km). Gap adjustment is only successful if the valves are properly sealed, there is no unacceptable clearance in the valve guide, and the valves have no damage to the stem ends.
If the gap is too small, the valve timing changes, poor compression is observed, the engine power decreases, the engine runs unevenly. In extreme cases, valves can be deformed and the valves or their seats can be burned.
If the gap is too large, strong mechanical noises are observed, the distribution phases change, the engine gives little power due to insufficient filling of the cylinders, the engine runs unevenly.
To adjust the gap, there are special adjusting washers with a thickness of 3.00 to 4.25 mm. The washer thickness is etched on the underside. When installing, it is imperative to pay attention to the fact that this designation looks down, i.e. to the cup pusher.
Mounting washers and their numbers:
Thickness, mm | Number | Thickness, mm | Number |
3,00 | 056 109 555 | 3,65 | 056 109 568 |
3,05 | 056 109 556 | 3,70 | 056 109 569 |
3,10 | 056 109 567 | 3,75 | 056 109 570 |
3,15 | 056 109 568 | 3,80 | 056 109 571 |
3,20 | 056 109 569 | 3,85 | 056 109 572 |
3,25 | 056 109 570 | 3,90 | 056 109 573 |
3,30 | 056 109 571 | 3,95 | 056 109 574 |
3,35 | 056 109 572 | 4,00 | 056 109 575 |
3,40 | 056 109 573 | 4,05 | 056 109 576 |
3,45 | 056 109 574 | 4,10 | 056 109 577 |
3,50 | 056 109 575 | 4,15 | 056 109 578 |
3,55 | 056 109 576 | 4,20 | 056 109 579 |
3,60 | 056 109 577 | 4,25 | 056 109 580 |
Washers supplied earlier can be used in the future if they do not have mechanical damage.
Installation
Remove air filter.
Remove the cylinder head cover, see "cylinder head".
The valve clearance is adjusted in the following sequence: 1-3-4-2 cylinder. The 1st cylinder is opposite the flywheel.
(15-220) turn the crankshaft with a belt pulley using a socket wrench or, with the 4th gear engaged, by pushing the car until the cam pair of the adjustable cylinder points upwards. Then the cam pair will not lie on the adjusting washers.
Attention! Do not turn the camshaft wheel by the fixing bolt, as in this case, the toothed belt is subjected to a large load. When the engine rotates backwards by the crankshaft, for example, when adjusting valves, it can happen if the bolt that secures the toothed belt to the shaft comes off.
(15-013) Measure the valve clearance using a template.
Attention! The order of the valves from the end of the engine: 1st exhaust cylinder - intake; 2nd: exhaust - inlet; 3rd: inlet - outlet; 4th: inlet - outlet. The template should slide back and forth between the cams and the shim with difficulty.
(15-358) pay attention to the alignment of the intake and exhaust valves, measure the valve clearances and record their value. A - exhaust valve, E - inlet.
(15-359) before applying the pressure, turn the bowl-shaped pusher so that the grooves lie on the side of the suction pipe.
Attention! When adjusting the clearances, the piston must not be at top dead center, otherwise the valves will be pressed against the piston and destroyed. Therefore, turn the cardan shaft by about 1/4 turn.
Correct clearance. To do this, workshops use a special tool VW 546 and 10-208, which is supplied by various companies in a similar design. Without these tools, clearance adjustment is not possible. Using a special clamp, press the cup-shaped pusher down. The adjusting washer is pulled out by forceps.
Attention! From August 1982, clamp 2078 is required. There is a corresponding designation on the cylinder head cover.
(02-016) insert the desired mounting washer.
Attention! The labels should point down.
Remove the clamp and turn the camshaft further.
Adjust the valves of the 3rd cylinder, etc.
Note: As the mileage increases, the gap becomes smaller, which means that the previously installed washer becomes too thick and must be replaced with another, thinner one.
If the gap is within tolerance, then the washer need not be replaced. If the tolerance is not maintained, then when adjusting, you should strive to achieve an average value, for example, 0.25 mm.
Apply new cover gaskets. Screw on the cover, see "cylinder head".
Install the air filter.
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