Checking and adjusting valve clearances
For adjustment you need:
- - disconnect crankcase ventilation hoses
- - remove rocker cover;
- - remove the radiator grille, disassemble
Checking and adjusting the thermal clearances between the valves and the rocker arms is carried out on a cold engine with the nuts for fastening the cylinder head and the nuts for fastening the racks of the rocker axis.
To check the air filter, disconnect the throttle cable and the hose of the vacuum regulator of the sensor-distributor;
- - fastening the upper mounting point of the radiator, remove the upper panel of the radiator lining and loosen the tension of the fan drive belt;
- set the piston of the first cylinder to the top dead center (TDC) of the compression stroke, for which, with a special 36 mm wrench from the drivers tool kit, turn the engine crankshaft to a position where the rocker arms of the intake and exhaust valves will swing freely (the valves are closed) , and the second mark on the damper pulley will align with the pin on the timing gear cover;
The first one is the mark that fits the pin when rotated clockwise.
- use a feeler gauge to check the gaps between the rocker arms and valves of the first cylinder.
If the gap is incorrect, use the adjusting screw to set the gap on the probe, then, while supporting the adjusting screw with a screwdriver, tighten the lock nut and check the correct gap;
- turning the crankshaft half a turn, adjust the clearances of the remaining cylinders according to the order of their operation 1-2-4-3.
The gap between the rocker arm and the valve on a cold engine (15-20 ° C) for the exhaust valves of the first and fourth cylinders should be 0.30-0.35 mm, and for the remaining valves - 0.35-0.40 mm.
The first cylinder is counted from the car radiator("For the gifted").
More info:
The gaps are adjustable on a cold (15-20°С) engine.
The clearances for the exhaust valves of the first and fourth cylinders (end valves) should be 0.30–0.35 mm. For all other valves - 0.35–0.40 mm.
Remove the cylinder head cover.
With a head or a “36” key, we turn the crankshaft by the damper pulley mounting bolt clockwise (front view) ...
... until the second (clockwise) mark on the damper pulley aligns with the pin of the timing gear cover (the piston of the first cylinder must be at TDC on the compression stroke - both valves are closed).
If the valves have not closed (exhaust stroke), turn the crankshaft one more turn.
Using a set of feeler gauges, we check the clearances in the valve drive of the first cylinder.
Using the “14” key, release the lock nut of the adjusting screw and unscrew the adjusting screw by one or two turns.
Insert a probe between the valve stem and the rocker.
We turn the adjusting screw until the probe moves in the gap with little effort.
Having set the gap, hold the adjusting screw, tighten the lock nut (in this case, the gap will decrease slightly) and check the gap again.
We adjust the clearances of both valves of the first cylinder.
Instead of a screwdriver, the adjusting screw can be held with an 11 wrench.
Turning the crankshaft clockwise each time by 180° (half a turn), we adjust the clearances in the valve drive of the remaining cylinders according to the order of their operation, i.e. 1–2–4–3
Install the cylinder head cover with gasket.