Owners of Renault Logan cars, after the warranty period expires, are faced with the need for self-service of their cars. One of the necessary procedures is valve adjustment. “Renault Logan” is arranged quite simply. So, you can do this procedure with your own hands and not spend money on service stations. The valve clearance adjustment scheme is quite simple and accessible even for those who have never had experience in this business.
These cars are presented on the market in versions with engines of 1.4 and 1.6 liters. There are two versions of 1.6 liter engines. An 8-valve and a 16-valve are available. On the sixteen-valve unit, manual adjustment of the gaps is not provided. For this, there are hydraulic lifters in the design. But on the eight-valve, the adjustment of the gaps is done manually. Let's see how this is done.
Purpose and functions
Intake and exhaust valves - one of the most important parts of the internal combustion engine. Due to them, fuel will enter the combustion chambers and burned products go into the exhaust system. For most of the duty cycle, the valve is closed. Opening takes place over a fairly short period of time. These elements are now subject to certain requirements.
Valves should not interfere with the exit of combustion products. When they are open, they carry out their tasks with minimal friction, clearly fulfill their function, work at a certain moment. Also, the valve must have a strictly defined clearance. This prevents the gases from escaping from the chamber at the time of ignition of the mixture.
Why regulate?
First, let's find out why valve adjustment is needed. Renault Logan has its own compensation valve clearance. This is the specific distance between the adjustment bolt and the actuator shaft. Renault specialists provide for certain gaps. They make it possible to compensate for the expansion of metal parts during their heating.
In case of untimely adjustment and incorrect clearances, there is a risk of accelerated wear of engine parts and assemblies. If the parameters are too high, the power and other performance characteristics of the power unit drop. The combustion chamber cannot be fully filled with the fuel mixture to the right extent. A small gap leads to losses in the combustion efficiency of the combustible mixture. In this case, there will be low compression. There is also a risk of burning valve seats and carbon deposits.
If you operate a car with unadjusted clearances, this will lead to serious malfunctions in the gas distribution mechanism. As a result, expensive repairs.
Frequency of operation
How often should valve clearance be adjusted? Renault Logan according to the regulations and recommendations from the manufacturer is subject to tuning every 80-100 thousand kilometers. However, in reality, these figures are much lower.
In order to stay confident on this car in the city stream, you have to squeeze all the power and torque that this unit is capable of. Such operation does not pass without a trace for the motor. So, details of the piston group wear out intensively.
In Russian realities, this operation should be performed at least every 60 thousand km. The engine will tell the owner about the need for adjustment. During engine operation, characteristic idle knocks will be clearly audible.
Clearance Standards for Renault Logan Engines
The French automaker recommends setting a clearance of 0.1 to 0.15 mm for each inlet valve. For graduation rates are from 0.25 to 0.3 mm. If all valves have been replaced, then lapping gaps must be set. They should be from 0.20 mm to 0.25 mm.
Necessary tools
To perform this operation, we need a standard set of tools.
You need pliers, a set of measuring probes, open-end wrenches - 13 and 10, as well as a screwdriver.
How to set up the valve: preparation for surgery
So, the valve adjustment (Renault Logan 2004 including) is always carried out only on a cold engine. Before performing the operation, it is recommended to tighten the timing belt if it is loose.
Operation Order
Do-it-yourself adjustment of Renault Logan valves begins with the removal of the cylinder head cover. You need to have a toolbox.
First of all, unscrew the bolts that hold the air filter. There are four of them. Next, the L-shaped pipe coming from the filter to the
valve cover is dismantled
. Then remove the air filter housing. In the next step, disconnect the spark plug wires and remove the valve cover. The latter rests on eight bolts.
After that, you should raise the front of the car from the driver's door and put in fourth gear at the checkpoint. The raised wheel is turned until the letter F appears on the camshaft gear. It is necessary to observe the valve of the first cylinder. The letter will appear almost immediately when the valve begins to move. In this case, for one full revolution of the car’s wheel, the camshaft also makes one revolution.
Then measure the gaps for the first cylinder. Loosen the locknut and clamp the bolt with pliers. Special probes are designed to measure gaps. After setting the required distance, screw the valve adjustment bolts onto the Renault Logan auto. Further, it is recommended to check the parameter again using the probe. The latter in the gap should move only when a certain effort is applied to it.
The same operation is done for the third cylinder. If you crank the crankshaft another half-turn, then you can adjust the gaps on the fourth cylinder. Then on the second. Next, the shaft must already be turned a whole turn and again check each gap. If everything is in order, the engine can be assembled.
Do not violate this procedure for adjusting valves on Renault Logan. When servicing a car, you must always act according to the manufacturer's instructions.
Renault Logan and HBO
As for cars whose engines run on gas, here the opinions of car owners and manufacturers of gas equipment differ. Manufacturers of modern Euro-4 equipment claim that with these installations the Renault Logan does not need to adjust the valves for gas, as the nozzles are accurate and modern. All system operation is electronically controlled.
Car owners argue that you need to adjust the gaps, and this operation should be done more often. So, many carry out tuning every 20-30 thousand kilometers. As for the gaps, for inlets it is considered the norm of 0.15 mm. For graduation - 0.30 mm. Recall that these parameters are suitable for propane-butane.
Useful Tips
In order to easily and simply expose the piston of the first cylinder at TDC, the camshaft is first exposed to the eye. Then it is rotated so that the two heels of the rocker arm, on which the valves are adjusted, can abut against the occipital part on the shaft cams.
The adjustment process can be greatly simplified. After the cover is removed, on the flywheel side at the end of the camshaft you will find a mark in the square part. The stain made by enamel will look up if the piston in the first cylinder is installed at top dead center. To move the shaft, car owners are advised to include not fourth, but fifth gear.
After the adjustment of the valves for the first cylinder is completed, go to the exhaust valve of the fourth cylinder. The posted wheel rotates further and adjusts the clearance. How are valves adjusted further? Renault Logan is configured in the second cylinder. The procedure is similar to the operations on the first. How is the valve adjusted? Renault Logan is configured according to the following algorithm - 1-4-2-3. Each digit is a cylinder serial number.
Conclusion
This is how the valves are adjusted. Renault Logan (1.6, 8 valves) can be serviced with your own hands. In fact, this operation is really simple, and a motorist of any level, both beginner and experienced, will be able to perform it. Self adjustment is also a good way to save. Indeed, at the service station, a considerable amount is taken for this service.