Check and adjustment
Examination
If camshafts or valve-related components are removed or replaced, or if abnormal engine operation occurs over time due to changes in valve clearances, check as follows:
1. Remove the valve cover. See below.
2. Measure valve clearances as follows:
A. Set the piston of cylinder No. 1 to TDC on the compression stroke.
- Turn the crankshaft pulley (1) clockwise and align the TDC mark (colorless risk) (IN) with timing indicator (A) on the front cover.
C. White paint mark (not used during maintenance).
- Make sure at the same time. that the working projections of the camshafts of the intake and exhaust camshafts of cylinder No. 1 are facing each other () as shown in the figure on the next. p.
- Otherwise, turn the crankshaft pulley one more turn (360°) and insert them as shown in the figure on the next page. p.
1. Intake camshaft.
2. Exhaust camshaft.
b. Using a feeler gauge, measure the valve clearances between the valve lifters and the camshaft.
Riveted Gaps: See section below «Technical data and specifications».
Guided by the figure, use a feeler gauge to measure the valve clearances in the places marked «X», as indicated in table No. 1 below (in the figure the places are marked with black arrows).
A. Release side; B Cylinder No. 1; C Cylinder No. 2; D Cylinder No. 3; E Cylinder No. 4; P Intake side.
With. Set the piston of cylinder No. 4 to TDC on the compression stroke.
Turn the crankshaft pulley (1) one turn (360°) clockwise and align the TDC mark (colorless risk) (IN) with timing indicator (A) on the front cover.
C. White paint mark (not used during maintenance).
Using a feeler gauge, using the drawing as a guide, measure the valve clearances in the places marked «X», as indicated in table No. 2 below (in the figure the places are marked with black arrows).
A. Release side; B. Cylinder No. 1; C. Cylinder No. 2; D. Cylinder No. 3; E. Cylinder No. 4; F. Intake side.
3. If the measured value differs from the norm, make an adjustment. See below.
Adjustment
Make adjustments based on the selected valve tappet thickness.
1. Remove the camshafts. See below.
2. Remove valve tappets whose clearances differ from the norm.
3. Using a micrometer (A) measure the thickness at the center of the removed valve tappets.
4. Calculate the thickness of the replacement valve tappet using the following formula:
Calculation of valve tappet thickness.
t-t1+ (C1 - C2), Where:
- t = Thickness of replacement valve tappet.
- t1 = Thickness of replacement valve tappet.
- C1 = Measured valve clearance.
- C2 = Standard valve clearance.
Inlet: 0.30 mm.
Release: 0.33 mm.
- Thickness of the new valve tappet (IN) can be identified by the markings (A) embossed on the reverse side (inside the cylinder).
- Marking «302» means thickness 3.02 mm.
Note. Valve tappets are available in 26 thicknesses ranging from 3.00 to 3.50 mm in 0.02 mm increments (during production at the factory).
5. Install the selected valve tappets.
6. Install the camshafts. See below.
7. Install the timing chain and related components. See below.
8. Turn the crankshaft pulley by hand several turns.
9. Make sure valve clearances are within specification.
10. Install all removed components in the reverse order of removal.
11. Warm up the engine and check for unusual noise or vibration.
Table No. 1
Measurement location | Cylinder No. 1 | Cylinder No. 2 | Cylinder No. 3 | Cylinder No. 4 | |
The piston of cylinder No. 1 is at TDC during the compression stroke | Issue | X | X | ||
Inlet | X | X |
Table No. 2
Measurement location | Cylinder No. 1 | Cylinder No. 2 | Cylinder No. 3 | Cylinder No. 4 | |
The piston of cylinder No. 4 is at TDC during the compression stroke | Issue | X | X | ||
Inlet | X | X |