TC4EE1 turbodiesel engine with a volume of 1.7 liters
To compensate for thermal expansion, there must be a certain gap in the valve actuator. Too small a gap leads to a violation of the valve timing and a decrease in compression. In extreme cases, the valves are deformed and burnt.
Too much clearance results in a lot of noise during operation. The valve timing is broken. Due to the short valve opening time and poor filling of the cylinders, the engine power decreases and its operation becomes unstable.
The correct operation of the valves is possible only when the valves have a good seal, the gaps in their drive do not exceed the permissible values, and the ends of the valve stems do not have cold hardening.
Valve clearances must be checked and adjusted during scheduled maintenance, after repair, and when noise occurs in the valve mechanism. Valve clearances are checked and adjusted on a cold engine.
Examination
Remove cylinder head cover.
Rotate the crankshaft so that the lobe of the variable valve cam is pointing up. Rotate the pusher cup so that the pusher groove points forward.
To rotate the crankshaft, engage 5th gear, jack up one of the front wheels and turn the wheel by hand.
Check valve clearance. It should be: for intake valves - 0.15 mm, for exhaust valves - 0.25 mm.
The probe should enter with a slight thawing. Otherwise, clearance adjustment is required.
Rotate the crankshaft and repeat the above procedure for the other valves.
If clearance adjustment is necessary, use a set of feeler gauges to determine the clearance and record it.
Reinstall the cylinder head cover and tighten its fastening bolts to 10 Nm.
Adjustment
The clearance in the valves is adjusted by replacing the shims with washers of the desired thickness. To do this, the valve spring must be compressed. Opel KM-650 valve spring compressor should be used.
Remove adjusting washer.
Determine the required thickness of the shim.
Lubricate a new adjusting washer of the desired thickness with oil and install it in place.
Attention! When installing the adjusting washer, make sure that its marking is directed downwards.
Adjust the clearances in all valves in the same way.
Determination of shim thickness
Measure the thickness of the previously standing shim with a micrometer. Record the result. The designation of the thickness of the washer is located on one of its sides.
The following formula can be used to calculate the washer thickness:
N=T+ (A - S) Where
N is the thickness of the new shim,
T is the thickness of the removed washer,
A is the current clearance in the valve,
S is the required clearance in the valve.
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