Table of contents: Examination ↓ Adjustment ↓
Examination
If the camshaft or valve related components are removed, installed or replaced, or if engine operation deviates from the normal range over time due to changes in valve clearances, check as follows:
1. Remove the valve cover. See section "Valve cover".
2. Measure the valve clearances as follows:
- a. Set the piston of cylinder No.1 to TDC in the compression stroke.
Turn the crankshaft pulley (2) clockwise and align the TDC mark (colorless risk) (A) with timing indicator (1) on the front cover.
B. Mark with white paint
At the same time, make sure that the working projections of the camshafts of the intake and exhaust valves of cylinder No.1 are positioned as shown in the figure.
Otherwise, rotate the crankshaft pulley one more revolution (360°) and align the marks as shown in the figure.
- b. Using a feeler gauge, measure the valve clearances between the valve lifters and the camshaft.
Valve clearances:
Unit: mm
| Valve | Cold engine | Hot engine* |
| Inlet | 0,26-0,34 | 0,304-0,416 |
| Release | 0,29-0,37 | 0,308-0,432 |
*: Approx 80°C (reference data)
Using the figure as a guide, measure the valve clearances using a feeler gauge at the locations marked with an "x" as indicated in the table below (in the picture the places are marked with black arrows).
- c. Turn the crankshaft pulley (2) one revolution (360°) clockwise and align the TDC mark (colorless risk) (A) with timing indicator (1) on the front cover.
Using the figure as a guide, measure the valve clearances using a feeler gauge at the locations marked with an "x" as indicated in the table below (in the picture the places are marked with black arrows).
| Cylinder | №1 | №2 | №3 | №4 | |
| Place of measurements | Inlet | x | x | ||
| Release | x | x | |||
3. If the measured value is different from the norm, make adjustments.
Adjustment
Note: Perform adjustment based on the selected valve tappet thickness.
1. Remove the camshaft. See section "Removal".
2. Remove the valve lifters whose clearances differ from the norm.
3. Using a micrometer, measure the thickness at the center of the removed valve lifters.
4. Calculate the thickness of the replacement valve lifter using the following formula.
Calculation of valve tappet thickness:t=t1+(C1-C2)
where:
t — Thickness of the replaceable valve stem
t1 — Thickness of the removed valve tappet
C1 — Measured valve clearance
C2 — Standard valve clearance
Inlet: 0.30mm
Issue: 0.33 mm
The thickness of the new valve lifter can be determined by the markings stamped on the back side (inside the cylinder).
The marking "300" means a thickness of 3.00 mm
1. Marking
2. Valve tappet thickness
Note: Valve tappets are available in 26 thicknesses ranging from 3.00mm to 3.50mm in 0.02mm increments (during manufacturing at the factory).
5. Install the selected valve lifter.
6. Install the camshaft. See the Installation section.
7. Turn the crankshaft pulley by hand a few turns.
8. Using the standard values, make sure that the valve clearances on a cold engine are within the normal range. See the "Checking" section.
9. Install all removed components in the reverse order of removal.
10. Warm up the engine and check for unusual noise or vibration.