The GRM abbreviation is deciphered as a gas distribution mechanism. The belt of the gas distribution mechanism acts as a binder element between the crankshaft and the distribution shaft. Replacing the timing belt is strictly regulated by the car manufacturer. On time, the unnoticed timing belt is able to deliver a lot of trouble and significantly increase the cost of the car owner.

What does the timing belt look like

The belt of the gas distribution mechanism looks like a closed rubber ring, a certain diameter, with teeth on the inside.

The belt is made of rubber or other synthetic materials, due to this, it practically does not make noise, not fully susceptible to corrosion and is part of a complex, single design.

The materials from which the belt of the gas distribution mechanism is made are very stringent requirements. Since it is regularly exposed to high temperatures. The material from which the timing belt is manufactured must maintain its technical characteristics in the temperature range from -50 to 120 degrees.

Where is the timing belt

The timing belt is in front of the engine and is hidden directly under the casing of the gas distribution mechanism.

Timing belt marks, why need

When producing a replacement or work related to the removal of the belt of the gas distribution mechanism. First of all, a distribution and crankshaft should be set on special tags.

After that, no turns are allowed, since otherwise the pistons can "meet" with valves. Tags serve as a guideline, in which position should be the crankshaft and distribution shaft, for normal and high-quality engine operation of the car.

Roller belt timber, why need

The tension roller of the gas distribution mechanism is designed to adjust the tension of the timing strap itself. It is a spring-loaded device, which is made on the basis of the bearing. In addition to the tension function, the roller also performs the role of a stabilizer, not allowing the oscillations of the timing belt, as a result of which it can jump or jump.

The roller tension of the timing belt is consumable. As a rule, it changes in conjunction with the belt. In some types of internal combustion engines, several similar rollers are used.

Tension belt timing like check

Checking the belt tension of the gas distribution mechanisms is performed in 3 different cases:

1. Replacing the timing belt;
2. After carrying out work related to the removal of the timing belt;
3. Periodically, the entire period of operation of the car.

Interesting! Read more about checking the timing belt tension in the article "Timing belt, timing belt tension and how to eliminate problems".

In essence, you can use two different ways to check the timing belt tension:

• Method first. At the longest area of \u200b\u200bthe gas distributor belt, try to unscrew the belt using 2 fingers. A well-stretched belt will hardly be rotated at 70-90 degrees.

• The method of the second. In this method, you will need a caliper and manual spring scales. It is necessary to hook scales with a crochet for the belt of the gas distribution mechanism and pull them. It is necessary to pull until the value on the scales reach the value of 10 kilograms. After that, it is necessary to measure the caliper deflection of the timing belt from its normal position. The value at a good belt tension is 5.5 millimeters.

When the belt is tensioning, it should be remembered that it is not allowed both weak and strong belt stretch.

Negative effects with a weak tension of the belt of the gas distribution mechanism:

• Torn timber belt;
• Valve bend.

Negative consequences with a strong tension of the belt of the gas distribution mechanism:

• Version belt wear is intensified;
• Expanded wear of the rollers.

The pledge of durable work as a timing belt and the entire gas distribution mechanism is the correct tension of the strap itself.

Causes of timing belt

The scope of the belt of the gas distribution mechanism is able to deliver a lot of trouble to the car owner.

Let's try to figure out for what reasons there is a rupture of the timing belt:

• Irregular tension of the timing belt;
• Belt wear timing;
• Hit dirt, sand and oil on the timing belt.

Tools assistants to replace the timing belt

Replacing the belt of the gas distribution mechanism occur with the following tools:

• Set of standard automotive keys;
• Special key for tension roller timber timing;
• Manual spring scales.

Replacing the timing belt, work stages

The replacement of the belt of the gas distribution mechanism should be performed only by those people who have the necessary knowledge and skills, as well as confident in their own forces. With incorrect installation and belt tension, the likelihood is extremely high that the car owner will incur additional financial costs. Which, as a rule, they are many more than the amount for replacing the timing belt in the auto repair shop.

Replacing the timing belt occurs in the following sequence:

1. Open the car hood;
2. Remove the timing belt protection;
3. For a bolt, which is directly attached pulley. Turn the strap of the gas distributor in such a way that the cylinder piston number 1 stood in the NTC (upper dead point) when compression tact. The indicator serves as labels on the timing cover and pulley.
4. Turning the pulleys into the required position, you must fix them with screwdrivers. To do this, insert it between the flywheel teeth in the clutch crankcase.
5. Remove the pulley of the generator. To make it necessary to unscrew the fastening bolt.
6. After that you need to loosen the tension roller as much as possible.
7. Now you can remove the old belt and install a new one.
8. We collect everything in the reverse order and check the tension of the timing belt.

Replacing the roller timber

The replacement of the TRP Tensioner is made strictly according to the list of regulatory work of the car manufacturer.

The timing roller, is made on the basis of the bearing. Like any bearing, the roller of the gas distributor is not eternal and periodically requires replacement. As a rule, this is happening together with the replacement of the belt of the gas distribution mechanism.

It is possible to determine the correctness of the timing roller in the following indicators:

• Rotation of roller smooth and stable (without bounce and outsiders);
• Lack of backlash in the video.

Professional timetables for leaving the timing belt

• The belt and rollers of the gas distribution mechanism should be changed strictly in accordance with the list of regulatory work.
• At each replacement of the gas distributor belt, it is necessary to carefully examine all rollers for the presence of backlays and snacks.
• You should not operate a car with a damaged or incorrectly strained timing belt.
• A squeal descending when driving under the hood of a car, most likely testifies to the thrust strap timing.
• It is not allowed to enter fuel and lubricants or any other garbage on the belt and timing rollers.
• It is necessary to check the tension of the timing belt every 15 thousand kilometers.