10. Remove one of the tappets with its adjusting washer (make sure that the washer does not fall out of the pusher). Clean the washer and measure its thickness with a micrometer (see photos).
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11. See what clearance value was obtained for the corresponding valve. If the gap was larger than necessary, it is necessary to install a thicker washer; if it was too small, a thinner one.
Example calculation for too large valve clearance:
- Required valve clearance (A) = 0.20 mm
- Measured gap value (B) = 0.28 mm
- Difference (B-A) = 0.08 mm
- Thickness of the original washer = 2.62 mm
- Required washer thickness = 2.62 + 0.08 = 2.70 mm
Example calculation for too small valve clearance:
- Required valve clearance (A) = 0.40 mm
- Measured gap value (B) = 0.23 mm
- Difference (B-A) = 0.17 mm
- Thickness of the original washer = 2.86 mm
- Required washer thickness = 2.86 - 0.17 = 2.69 mm
12. Shims are available in thicknesses from 1.650 mm to 4.000 mm with a step of 0.025 mm in the middle of the range and 0.075 mm at its edges. Before measuring or installing new gaskets, they should be cleaned.
13. Repeat the above operations on the remaining tappets and washers. When installing the tappets in place, be careful not to mix them up.
14. When assembling, lubricate the washer with oil and install it on the valve stem. Lubricate the plunger and carefully lower it into place. Be careful not to let the washer move.
15. After installing all the tappets, reinstall the camshaft. Before installing the camshaft drive belt, the valve clearances must be checked again. (All pistons should be at the middle of their stroke; to check the clearances, the camshaft should be rotated through its sprocket).
16. If the tappets are noisy when the engine is warm, the noise can be eliminated or reduced by setting the valve clearances to the minimum permissible value.
17. The latest models are equipped with a modified tube for lubrication of bearing caps, which helps eliminate tappet noise. This modified tube can also be installed on earlier models.
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