How to adjust the valve angular clearance of the Warrior off road vehicle engine 5

Valve lash adjustment is an important adjustment item necessary to maintain the normal operation of the engine. If the valve clearance is too large, it will delay the opening time of the valve, affect the full inhalation of the combustible mixture or the full discharge of the combustion exhaust gas, and will make a knocking noise during the cooling machine and accelerate the wear of the valve seat; If the valve clearance is too small, when the engine is hot, due to the heated expansion of the parts of the valve mechanism, it may cause the parts to be crushed, the valve is not closed tightly, the carburetor is tempered and the normal operation of the engine is destroyed, and some may cause valve ablation. The recommended figures for valve clearance are:

The gap between the intake valve end and the rocker arm head is dirt, and the gap between the exhaust valve end and the rocker arm head is taxi. There are many ways to adjust the valve clearance, for example, when the piston of each cylinder is at the top dead center of the power stroke, the intake and exhaust valve clearance of the corresponding cylinder can be adjusted, so that the crankshaft needs to be rotated for two weeks and adjusted in six times, which is more complicated. The recommended method is:

When the piston of a cylinder is at the top dead center of the power stroke, the 1st, 2nd, 4th, 5th, 8th, 9th valves can be adjusted (from front to rear), and then the crankshaft can be rotated to the top dead center of the power stroke of the 6th cylinder, and then the 3, 6, 7, 10, 11, 12 valves can be adjusted. This adjustment is due to the fact that when the piston of the I cylinder is at the top dead center of the power stroke, the intake valves of the 1st, 2nd and 4th cylinders (i.e., 2, 4, 8 valves) and the exhaust valves of the 1, 3 and 5th cylinders (i.e., 1, 5, 9 valves) are closed, and the rocker arms corresponding to each valve are also in a loose state, so the valve clearance can be accurately adjusted. In the same way, the crankshaft is rotated to the top dead center of the 6-cylinder power stroke, which is exactly the 6 valves 3, 6, 7, 10, 11 and 12 mentioned above, which are in a completely relaxed state, and the valve clearance can be accurately adjusted.

Cylinder-by-cylinder adjustment method.

According to the cylinder ignition sequence, after determining the position of the piston of a cylinder at the top dead center of compression, the inlet and exhaust valve clearances of this cylinder can be adjusted; After adjustment, shake the crankshaft, and gradually adjust the valve clearance of other cylinders according to this method.

The two-adjustment method is used.

Rotate the crankshaft so that the piston of the first cylinder is at the top dead center of compression, and the flywheel mark is aligned with the inspection hole engraved line, and the valve can be adjusted and the valve (refers to the order of the engine valve from front to back); Then shake the crankshaft one circle so that the six-cylinder piston is at the top dead center of the compression stroke, and then adjust the "plus two" (i.e. ) valves, which is actually a mnemonic adjustment. When adjusting, while tightening the adjustment screw, insert the valve stem end with a thick gauge and pull back and forth between the rocker arm to feel a slight resistance, and then check again until it fits.

The cylinder-by-cylinder method requires a large number of crankshafts to be rotated, and it takes a lot of time to check and adjust, but for engines with serious wear, it is more accurate to use the cylinder-by-cylinder method to check and adjust the valve clearance. It is more time-saving and labor-saving to adjust the valve clearance twice, but for different models, it is necessary to memorize different adjustable valve sequence numbers, and the model is complex, so it is difficult for maintenance personnel to remember.

The quick adjustment method of engine valve clearance is as follows:1Preheat the engine until the coolant temperature reaches 80 -90, open the timing mark inspection holes on the clutch housing and cylinder head cover, and ensure that the cylinder head bolts are tightened to the specified torque; 2.

Rotate the crankshaft so that the "0" engraved line on the flywheel is aligned with the marking line on the clutch housing, and confirm that the arc surface of the rocker arm of the first cylinder intake and exhaust valve is in contact with the cam base circle of the camshaft, that is, the piston of the first cylinder is at the compression top dead center (if the rocker arm is in contact with the cam, the crankshaft should rotate 360°), and the valve is in the closed position at this time; 3.Loosen the locking nut 2 of the adjusting screw 1, and turn the adjusting screw with a screwdriver, so that the gap between the lower end face of the screw and the upper end face of the valve stem 3 is the specified clearance value (determined by the thickness of the thickness gauge). Keeping the screwdriver still, tighten the lock nut to the specified torque, and then insert the thickness gauge into the gap A to recheck, so that the gap between the intake valve and the exhaust valve of the first cylinder can be adjusted; 4.

Then turn the crankshaft clockwise (as seen from the front of the engine), and the valve clearance of the next ignition cylinder is adjusted for every 180° of the 4-cylinder engine in the firing order of 1-3-4-2. For a 3-cylinder engine, it can be adjusted in the firing sequence of 1-2-3 per 240 revolutions (the angle of rotation of the crankshaft can be converted by the number of teeth of the flywheel ring gear).

The method of correctly adjusting the valve clearance of the engine: 1. When the engine is working, because the valve is working at high temperature, the valve and other parts are elongated due to thermal expansion, and a certain amount of valve clearance must be reserved when the valve is cold; 2. In order to ensure that when the valve is heated and expanded and elongated, the valve and the valve seat can still be closely matched. Due to the long working time of the valves, the original valve clearance was changed.

When you hear an abnormal "click" sound of the valve, you should check and adjust the valve clearance; 3. When adjusting the valve clearance, it must be adjusted according to the value specified by the manufacturer, and the valve must be completely closed, and the position of the valve clearance must be adjusted: the side-mounted engine is on the tappet, and the overhead engine is on the rocker arm.

How to adjust the valve clearance of automobile engine When the engine is working, because the valve is working at high temperature, the valve and other parts are elongated due to thermal expansion, so a certain valve clearance must be reserved when the valve is cold, so as to ensure that the valve and the valve seat can still be closely matched when the valve is heated and expanded. Due to the long working time of the valves, the original valve clearance was changed. Therefore, when you hear a "click" sound of the valve, you should check and adjust the valve clearance.

1 A simple method for determining the top dead center of 1 cylinder compression

If you know the ignition sequence (or injection sequence) of the engine, you should first find out exactly where the top dead center of compression is for the 1st or 6th cylinder when adjusting the valve backlash. Now the method of determining the top dead center of compression of 1 cylinder or 6 cylinder is more complicated, and it is very troublesome to operate (that is, remove the spark plug of the first cylinder, block the spark plug hole of the first cylinder with a big finger or cotton yarn ball, and then shake the crankshaft with a hand crank. When the thumb feels pressure or the cotton yarn ball jumps out with a "bang", it is the position of the top dead center of the compression of the first cylinder).

Now according to the author's maintenance experience, a simple and practical method is introduced: the use of cylinder (4 cylinders) piston on the same plane, 1 cylinder compression ends, 6 or 4 cylinder valves stacked this law to determine. That is, when the top dead center of the 1 cylinder is compressed, the exhaust valve of the 6 cylinder (4 cylinders) is close to closing, the intake valve is just on the top, the exhaust valve is not easy to grasp, the top of the intake valve is easy to observe, as long as the top rod of the intake valve is slightly upward, the 1 cylinder is in the position of the compression top dead center.

Similarly, when the 1-cylinder intake valve actuator is slightly moved, the 6-cylinder (4-cylinder) is at the top dead center of compression.

2 Tips for determining adjustable valves

The following is an example of a 6-cylinder engine with a work sequence of 1-5-3-6-2-4 to illustrate the method and formula for simple adjustment. When determining the top dead center of engine 1 cylinder in compression, 1 cylinder 2 valves are fully tuned cylinders at the beginning of compression and in the intake process, and 2 exhaust valves are adjustable. The 6 cylinders are not adjustable in the state of overlapping intake.

When the cylinder is exhausted and the work is finished, the 2 intake valves are adjustable. After adjustment, turn the crankshaft 360° to adjust all the remaining valves in turn.

It can be summarized as a mantra as: full adjustment, no adjustment. It can also be summarized as: take the first cylinder, go to the middle, adjust the front row, transfer in the back, and three hundred.

Sixth, the remaining cylinders, in turn. That is: the cylinder before the 6-cylinder adjusts the intake valve, and the cylinder after the 6-cylinder adjusts the intake valve.

If the 6 cylinders are at the top dead center of compression (6-2-4-1-5-3), the reasoning method is the same, starting from the 6 cylinders, it is also fully adjusted and not adjusted. That is, 1 cylinder ago'The cylinder is adjusted to the intake valve, and the cylinder after 1 cylinder is adjusted to the intake valve.

This method can also be used for 4-cylinder and multi-cylinder engines, taking the 4-cylinder engine with the work sequence of 1-3-4-2 as an example: its mantra is still fully tuned and not adjusted. That is, the cylinder before the 4-cylinder adjusts the intake valve, and the cylinder after the 4-cylinder adjusts the intake valve. The intake and exhaust valves of the 4th cylinder are not adjusted.

The above reasoning shows that as long as we remember the "mantra" and know the order of work of the engine, we can easily determine the adjustable valve.

You need to open the valve chamber cover, then loosen the valve paddle fixing screws, and tighten the screws after finding the gap with the pad paper.

Is it difficult to see the old driver adjust the engine valve clearance and grasp it by feel?

Divide the car. Clockwise coiling. That is, the crankshaft rotates forward.

Look at the first cylinder or the last cylinder valve. The intake valve is raised to the highest. The exhaust nods.

It's time to tune it. The 6-cylinder has to look at the 6-cylinder tuning 1, 2, 3, 6, 7, 10. Look at the rest of the tuning.

It should be noted that many valves are not obtained in order of intake, exhaust, and exhaust. It depends on the situation.

Start by determining what your engine is. Nowadays, most cars do not need to adjust the gap.

Preparation tools: word change cone, 12 openings, methods and steps of feeler gauge adjustment:

1: First remove the valve cover of the engine.

2: Turn the engine to the top dead center of the compression of one cylinder.

3: According to the double adjustment method, the double row is not close to the adjustment method, and the ignition sequence is 1-3-4-2

4: Loosen the adjustment screws. Plug in the feeler gauge. Intake valve, exhaust valve 5: the first time 1 cylinder both valves are adjusted, 3 cylinders only adjust the exhaust valve, 4 cylinders are not adjusted, 2 cylinders adjust the intake valve and the second time do not enter the double row.

1.Loosen the cylinder head cover tightening bolts and remove the cylinder head cover.

2.Rotate the crankshaft pulley clockwise so that the piston top dead center mark on the crankshaft pulley is aligned with the timing gear chamber cover.

3.Measure the valve clearance of valves 1 and 6.

4.Insert a suitable feeler gauge into the gap and check if the valve clearance is acceptable.

5.Turn the crankshaft one round, then measure the clearance of the other valves (4 and 8).

NOTE: Tap the rocker position with a steel hammer before checking to eliminate the gap between the tappet and the pusher. Valves 1 and 6 are one group, 4 and 8 are another group, and the same group can be checked and adjusted at the same time.

If the feeler gauge cannot be inserted or withdrawn without resistance after insertion, the valve clearance can be judged to be unqualified and must be adjusted.

Valve clearance adjustment method In actual maintenance, the two-time adjustment method is generally used to adjust the valve clearance, and the sequence is consistent with the inspection of the valve clearance. That is, at the top dead center of the first cylinder compression, adjust half of all valves, and then shake the crankshaft for one week, you can adjust the remaining half of the valves, and the adjustment is completed twice. Specific steps to adjust valve clearance:

First, loosen the lock nut, insert the feeler gauge with a thickness that meets the specified gap between the top of the valve and the rocker arm, rotate the adjustment screw at the same time until the feeler gauge is pulled and feel a slight resistance, and finally lock the adjustment screw with the lock nut. The valve clearance cannot change when locked. After the adjustment is completed, it should be rechecked with a feeler gauge, and if there is a change, it needs to be readjusted.

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It is more professional, and it is recommended to go to the auto repair shop to have a special auto mechanic to adjust.

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