When the hydraulic lifters knock, do not rush to change them immediately. Knocking is often caused by air or pollution. Try to eliminate these root causes and the knocking will disappear immediately.
Instructions
Step 1
When there is too little oil in the crankcase, then the oil pump draws in air. When parked for a long time on a slope, oil flows out of the hydraulic mounts. When the engine is started, air has time to enter the cavity of the hydraulic support. In this case, the hydraulic compensator will not press it and will lead to a knock of the operating valve mechanism. Therefore, to prevent such a knock, always monitor the oil level in the crankcase and, if necessary, bring it to normal.
Step 2
To remove air from the hydraulic mounts, warm up the engine at idle speed to the operating temperature. Raise the crankshaft speed to 4000 rpm, then sharply reduce it to idle. Let the engine idle for 15 seconds.
Step 3
Repeat this cycle 10-30 times. With serviceable hydraulic supports, the noise of the valve drive mechanism should disappear.
Step 4
After the noise disappears, repeat the de-airing cycle 5 more times. Now let the engine idle for 2-3 minutes. Make sure that the noise in the machinery has disappeared.
Step 5
If this operation does not help, and the knocking continues, try flushing the hydraulic mounts. To do this, prepare three containers of 5 liters of such dimensions that the hydraulic support fits in an upright position. Fill two of them with diesel fuel and the third with engine oil.
Step 6
Place the hydraulic support in the first container until it is completely immersed. Clean the outside of the part. Use only a nylon or natural brush for this, as metal can scratch the plunger surface.
Step 7
Then immerse the same support in a second container. Position it so that the diesel fuel enters the side opening. Lightly press the wire through the hole, squeeze and, while keeping it pressed, move the plunger 6-8 times.
Step 8
Remove the hydraulic support, depress the valve ball again and move the plunger until the flow of fuel completely stops.
Step 9
Place the support in a third container and squeeze the ball. While holding it in this position, move the plunger down until it stops, and then slowly up. This will fill the cavity above the plunger with oil.
Step 10
Pull the hydraulic support out of the container. Using light pressure on the plunger, make sure it remains stationary. Refit all parts.
Step 11
Start the engine and let it idle for 2-3 minutes.
