Self-diagnosis of the elastic coupling and outboard bearing of the VAZ 2107 propeller shaft

VAZ 2106 and 2107 are the same cars as Renault or Honda. The only difference is that it is the brainchild of the domestic automobile industry. However, this does not mean that they cannot break. A machine is, first of all, a mechanism, each detail in which plays its own special role. Depending on the quality of the road surface, the chassis of any car wears out over time. That is why it is very important to know how much the crosspiece costs for the VAZ 2106 and 2107.

On average in Russia, the cost of this element for both cars is 350-400 rubles . Depending on the region, the price may vary.

Elastic coupling for driveshaft VAZ 2107

The driveshaft of the VAZ 2107 consists of two parts (front and rear), connected to each other by a articulated coupling (cross). This design allows you to avoid loads on the shaft while driving, when the body and chassis of the car begin to “play.”

The VAZ 2107 cardan consists of front and rear shafts connected by a cross

The end of the rear shaft is connected to the axle gearbox, and the end of the front shaft is connected to the gearbox shaft. The connection to the gearbox is made through an elastic coupling, which is a kind of buffer for leveling shock and dynamic loads on the driveshaft and gearbox shaft.

The elastic coupling acts as a buffer, smoothing out dynamic loads

Flexible coupling location

The elastic coupling is located in the lower front part of the car on the rear side of the gearbox. You can see it if you remove the engine protection and climb under the car. The coupling is easily recognizable due to its hexagonal shape.

The clutch is located on the rear side of the gearbox in the lower front part of the car

Coupling design

The basis of the coupling is a cushion made of especially durable rubber. Along its circumference there are six steel bushings fused into rubber, through which the bolts connecting the cardan flanges and the gearbox secondary shaft pass. The coupling kit also includes a special tightening clamp, which is put on it during installation or dismantling.

The elastic coupling consists of a rubber base and six steel bushings located around the circumference

Diagnostics of elastic coupling faults

The coupling may fail as a result of:

• wear of metal bushings;
• body wear;
• rupture of the body.

In each of these cases, the malfunction will manifest itself in the form of body vibration and extraneous sounds coming from the gearbox.

The condition of the coupling can only be checked by inspecting it and assessing the size of the play between the flanges of the gearbox and cardan shafts. This is done as follows.

1. The car is driven onto an overpass or inspection hole;
2. The engine protection is removed;
3. The coupling body is inspected and the condition of the bolted connection is assessed.
4. By loosening the cardan, the presence or absence of play is determined.

If signs of wear or mechanical damage are found on the coupling body (the body is partially or completely torn), the part must be replaced. A slight play (provided the body is intact) is eliminated by tightening the nuts of the connecting bolts. If the play is large, the elastic coupling will have to be replaced with a new one.

Criteria for choosing a new coupling

Driveshaft couplings for the VAZ 2107 in Russia are produced under catalog numbers 2101–2202120 and 2101–2202120Р. The retail price of the part, depending on the manufacturer, ranges from 400 to 600 rubles.

Table: technical characteristics of the elastic coupling of the VAZ 2107 driveshaft

Overhaul of the engine in a VAZ 2106 car

Before starting a major overhaul of the VAZ 2106 engine, it is required to dismantle it for detailed disassembly of the component elements. This is only possible if you have the appropriate plumbing and measuring tools, as well as new sets of replacement parts.

The procedure for detailed disassembly of the unit is as follows:

1. Unscrew the frame fasteners. 2. Loosen the clamp on the fuel pump hose and dismantle the product, having previously unscrewed the nuts securing it. 3. Pull out the spacer plate under the fuel pump. 4. Disconnect the high-voltage wires from the spark plugs and dismantle them. 5. Take out the pressing plate. 6. Disconnect the hose from the vacuum-type regulator. 7. Dismantle the distributor. 8. Unscrew the generator fasteners, take out the spacer washer, the belt element and the generator itself. 9. Loosen the clamp fasteners and remove the thermal hose of the intake manifold. 10. We take out the water pump (pump) by removing its fastenings. 11. Disconnect the connecting hoses from the carburetor, breather, distributor and fan. 12. Remove the axial washer of the throttle drive bracket and its rod. 13. Unscrew the oil filter. 14. Unscrew the breather casing along with the dipstick. 15. We take out the oil sensor. 16. We release the crankshaft pulley from the fasteners to the engine block. We dismantle the crankcase fasteners and the product itself. 17. Unscrew the valve cover fasteners and the product itself. 18. We dismantle the cylinder head casing along with the plate and fasteners with a vacuum-type hose. 19. We take out the gasket installed above the cylinder head. 20. Unscrew the fasteners and remove the chain tensioner. 21. Turn the drive shaft sprocket holder bolt together with the crankshaft. 22. Unscrew the camshaft sprocket fasteners. 23. Remove the sprocket along with the camshaft drive chain. 24. We dismantle the fasteners, etc. “shoe” of the chain tensioner. 25. Unscrew all the fasteners of the bearing housing. 26. Remove the bolts holding the head and then remove it along with the gasket. 27. Pull out the flywheel. 28. Together with the fastening, remove the front protection of the clutch housing. 29. Remove the remaining fasteners securing the oil system housing. 30. Pull out the crankshaft oil seal mount from the rear of the engine. 31. Dismantle the oil pump with gasket. 32. Dismantle the drive shaft of additional mechanisms. 33. We take out the distributor drive gear using an awl or a screwdriver. 34. Unscrew and remove the oil separator with the oil drain tube. 35. Unscrew the connecting rod cap of cylinder I and dismantle it using auxiliary plumbing tools. 36. We take out the piston with the connecting rod holder. 37. Repeats this technological operation with the remaining cylinders. 38. Dismantles the crankshaft and then disassembles it. 39. Mark with a marker all the dismountable parts of the motor and place them in a certain order for subsequent assembly.

Suspension bearing for propeller shaft VAZ 2107

The suspension bearing (or idler bearing) is designed to ensure uniform rotation of the driveshaft while driving. In addition, it is an additional point for attaching the cardan and is included in the design of the intermediate (suspended) support. In fact, it itself is a support, since it comes complete with a bracket, with which it is attached to the bottom of the car through a transverse bracket.

The bearing design is based on the outer and inner races and seven steel balls

Outboard bearing location

The bearing is installed in front of the spider at the end of the front of the driveshaft. It can be seen from the inspection hole in the axial recess of the bottom behind the exhaust pipe at its junction.

The VAZ 2107 suspension bearing is located in front of the crosspiece on the front of the driveshaft

Hanging bearing design

The hanger bearing is an ordinary closed type ball bearing. It consists of an inner and outer race and seven steel balls. For mounting on the bearing housing there is a steel bracket with holes for bolts.

The suspended bearing is equipped with a special bracket for ease of fastening

Diagnosis of outboard bearing faults

The causes of outboard bearing failure are usually wear or mechanical damage. The service life of the bearing is about 150 thousand km. However, exposure to moisture, dirt, as well as stress caused by poor road conditions can significantly reduce it.

Signs of bearing wear are:

• slight vibration;
• hum emanating from the place where the cardan is “suspension”;
• shaft play.

It is quite difficult to accurately diagnose bearing failure; this will require dismantling the driveshaft.

Outboard bearing selection criteria

Suspension bearings for the VAZ 2107 in Russia are produced under catalog numbers 2101–2202080 and 2105–2202078. The requirements of GOST 6–180605 apply to them. Imported analogues must comply with the requirements of ISO 62305.2RS. If there are no such markings on the packaging of a new part, it is most likely a fake, and it is better not to purchase it. The average retail price of a VAZ 2107 suspension bearing is 450–500 rubles. When choosing a manufacturer, it is better to give preference to the Vologda Bearing Plant. Bearings produced at VPP are considered to be of the highest quality and most durable.

Table: technical characteristics of the VAZ 2107 suspension bearing

Article: 2105-2202078, additional articles: 2105-2202078RU, 2101-2202080

Order code: 146019

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Today, the next article in the series “Crystal VAZs or typical breakdowns of domestic cars” is dedicated to the “classics”: VAZ-2101, 2103, 2104, 2104, 2105, 2106 and 2107. These cars have been driving along our roads for decades and, despite Despite all the shortcomings that we will talk about, their popularity is still high.

Balancing the driveshaft VAZ 2107

After disassembling and replacing any element, the driveshaft must be balanced. This is done on a special stand, so for balancing it is easier to contact the nearest car service center. The balancing itself consists of measuring and eliminating the imbalance on the three shaft supports. Its permissible value at a shaft rotation speed of 5500 rpm should not be more than 1.62 N*mm. The imbalance is eliminated by welding small weights (metal plates) onto the surface of the front driveshaft.

If vibration appears after repairing the driveshaft, you can try to balance it yourself. Naturally, there can be no talk of any accuracy here, and the balancing itself will be only temporary. This is done as follows.

1. Drive the car onto a viewing hole or overpass.
2. Inspect the driveshaft.
3. Conventionally divide the front universal joint into four sectors (if you imagine it in cross-section).
4. Find a small weight weighing 30-50g and attach it to the front of the shaft using tape or tape.
5. Drive along a flat section of road, paying attention to your choices.
6. If the vibration does not disappear or increases, move the weight to another sector and repeat the checking process.

When the load is in its place, the vibration should stop, unless, of course, it is caused by an imbalance of the shaft.

Pricing factors

If you need to buy a new gearbox for a VAZ 2107, then you should first go to different places where this auto part is sold. This will help you purchase the part that is most suitable in all respects. Novice motorists often wonder about the wide cost range for the gearbox for the VAZ 2107.

Experts explain the price dispersion by the influence of the following factors on the price:

1. Quality.
2. Brand.
3. Originality.
4. Variety.
5. Place of purchase.
6. Delivery or installation required.
7. The reputation of the seller, his pricing policy.

Useful tips

To increase the service life of the VAZ 2107 driveshaft, you need to follow a number of simple recommendations.

1. Avoid excessive contamination of the driveshaft couplings.
2. Systematically check the tightness of the fastening elements and the presence of lubricant in the connecting units.
3. If shaft malfunctions are detected, do not delay repairs.
4. When purchasing spare parts for a cardan, pay attention to the manufacturer and compliance with GOST or ISO requirements.
5. After repairing the driveshaft, be sure to have it balanced at a service station.

Diagnosing a malfunction, repairing and replacing the suspension bearing and elastic coupling of the VAZ 2107 propeller shaft with your own hands is quite simple. This requires minimal plumbing skills, a standard set of tools and careful adherence to the recommendations of professionals.

Installing or replacing the cross

The price of this spare part is already known. Now it's time to talk about the cost of installing the cross. Replacing one part of the driveshaft costs 500-600 rubles . If you need to replace two parts and remove the shaft, then the price will rise to 1,500 rubles .

In the case where we are talking about replacing the steering cardan crosspiece, the cost can be 400-500 rubles. Only the employees of the car service center where the replacement will be made can say more specifically.

Usually, crosspieces from a domestic manufacturer cost 300 rubles , but if the manufacturer is imported, then the price will increase to 450 rubles .

Types of auto parts

According to their location, gearboxes are divided into:

• Front axle (used in front-wheel drive cars).
• Rear (used in rear-wheel drive vehicles).

Both versions of the spare part are installed in all-wheel drive vehicles.

There are four types of gearboxes:

1. Conical (suitable for vehicles with all-wheel or rear-wheel drive).
2. Cylindrical (used on cars with front-wheel drive).
3. Hypoid (installed in cars with all-wheel or rear-wheel drive).
4. Worm (used in the steering mechanism).

There are also gearboxes:

• With a high gear ratio (mounted on the transmission of cars with a large curb weight).
• With a low gear ratio (installed on car transmissions with low associated mass).

The gearbox on the VAZ 2107 can be:

1. Original.
2. Unoriginal.

On sale you can find auto parts of the following brands:

• AvtoVAZ.
• Lucas.
• Weber.
• Fedoro.
• Valeo
• PARKS.

New gearboxes for VAZ 2107 are sold:

• In a store that specializes in selling spare parts for cars.
• At the car market.
• In the online auto parts store.