10. Pull out one of the pushers 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 pictures).
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 is too small, a thinner one.
Calculation example for too large valve clearance:
- Required valve clearance (A) = 0.20 mm
- Measured clearance (IN) = 0.28 mm
- Difference (B-A) = 0.08 mm
- Original washer thickness = 2.62 mm
- Required washer thickness = 2.62 + 0.08 = 2.70 mm
Calculation example for too small valve clearance:
- Required valve clearance (A) =0.40 mm
- Measured clearance (IN) = 0.23 mm
- Difference (B-A) = 0.17 mm
- Original washer thickness = 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 in increments of 0.025 mm in the middle of the range and 0.075 mm at its edges. Before measuring or installing new gaskets, they must be cleaned.
13. Repeat the indicated operations on the remaining pushers and washers. When installing the pushers in place, be careful not to confuse them.
14. When assembling, lubricate the washer with oil and install it on the valve stem. Lubricate the pusher and carefully lower it into place. Be careful not to move the puck.
15. After installing all pushers, reinstall the camshaft. Before installing the camshaft drive belt, check the valve clearances again. (All pistons should be in the middle of their stroke to check the clearances, turn the camshaft 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 allowable value.
17. Latest models are equipped with a modified bearing cap lubrication tube to eliminate tappet noise. This modified tube can also be installed on early models.