Valve clearance adjustment
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1 - Measuring probe; 2 - Locknut; 3 - Adjusting screw; 4 - Screwdriver; 5 - Key
Note. Valve lifters for 1.6L engines are equipped with hydraulic compensators, and therefore there is no need to adjust valve clearances.
1. The efficiency of engine recoil largely depends on the correct adjustment of valve clearances. Exceeding the permissible value of valve clearances leads to a delay in the operation of the valves (too late opening and too early closing). On the other hand, a too tight fit of the components is fraught with the risk of loss of compression pressure as a result of incomplete closing of the valves due to thermal expansion of the pushrods. In addition, in such a situation, intensive burnout of the plates and valve seats occurs.
2. Valve clearances are adjusted on a cold engine (intake and exhaust valve clearances at an engine temperature of +20°C should be 0.20 mm). If the intake valve stems are made of aluminum instead of steel, the gap should be set to 0.25 mm. Remove the cylinder head cover (see chapter Engine repair). In order to facilitate turning the crankshaft, it makes sense to also turn out the spark plugs (see Section Replacing Spark Plugs - 1.3L Models).
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3. In order to provide access to the first two valves, unscrew the fixing bolt and remove the oil deflector A installed under the engine oil filler cap.
4. The tappet of the valve to be adjusted must rest against the heel of the corresponding camshaft cam (achieved by turning the crankshaft). For convenience, the valves are numbered starting from the one closest to the timing chain. Adjustment is made in accordance with this numbering, which avoids unnecessary crankshaft rotation. Below is a table to help you determine the order in which adjustments should be made:
Valve No. 8 | Valve No. 1 | (issue) |
Valve No. 6 | Valve No. 3 | (inlet) |
Valve #4 | Valve No. 5 | (issue) |
Valve #7 | Valve #2 | (inlet) |
Valve #1 | Valve #8 | (Issue) |
Valve No. 3 | Valve #6 | (inlet) |
Valve #5 | Valve #4 | (issue) |
Valve #2 | Valve #7 | (inlet) |
5. The required dimensions of valve clearances are given in the Specifications. To make adjustments, use a wrench to loosen the hex locknut on the rocker arm spherical support. The support is kept from turning with a screwdriver.
6. Insert the blade of the measuring probe of the thickness corresponding to the requirements of the Specifications into the gap between the end face of the valve stem and the working surface of the rocker arm of its actuator. By turning the adjusting screw of the spherical support, achieve a snug fit of the blade in the gap. After fixing the support in the desired position, tighten the lock nut and repeat the test.
7. Properly turning the crankshaft, repeat the procedure for the remaining valves in the order specified above.
8. Establish an oil deflector and with the demanded effort tighten a fixing bolt. Install the cylinder head cover and (if filmed) spark plug (see Section Replacing Spark Plugs - 1.3L Models).