Gasoline engine Nissan Qashqai 2.0 liters of the MR20DE series can be found not only on Nissan models, but also on Renault cars under the symbol M4R. Aspirated gasoline power varies from 133 to 147 hp. depending on settings. The motor is quite modern, its development was completed in 2005. The engine is assembled mainly in Japan.

Design of the Qashqai 2.0 liter engine.

Inline 4 cylinder 16 valve gasoline engine has an aluminum cylinder block. The timing chain drive is equipped with a variable valve timing system with a phase shifter on the intake camshaft. There are no hydraulic compensators in the cylinder head. The valves must be adjusted manually by selecting pushers-washers of different thicknesses.

Nissan Qashqai 2.0 engine cylinder head

Nissan Qashqai block head made of aluminum alloy. Two camshafts rotate in the bearing housing, which press their cams directly onto the valves through special pushers. The camshafts are not secured with separate covers, but with a common pastel. Spark plug wells have very thin walls; excessive force when tightening spark plugs leads to cracks in the cylinder head. The mechanism for changing valve timing on the intake shaft is implemented using hydraulic system. An increase in pressure causes an increase in the deviation of the camshaft from the nominal position relative to the valve axes. Oil pressure level is adjustable solenoid valve electronically controlled Nissan engine Qashqai.

Timing drive of Nissan Qashqai 2.0 engine

Timing drive Nissan Qashqai 2.0 chain. There are two chains. One larger size rotates the camshaft sprockets, the second small sprocket of the oil pump. With intensive use, the chain begins to stretch after 100,000 miles. This leads to phase shifts, which even the automation that controls the phase shifter cannot correct. The timing diagram is further in the photo.

Engine characteristics Nissan Qashqai 2.0

• Working volume – 1997 cm3
• Number of cylinders – 4
• Number of valves – 16
• Cylinder diameter – 84 mm
• Piston stroke – 90 mm
• Timing drive - chain (DOHC)
• Power hp (kW) – 141 (104) at 6000 rpm. per minute
• Torque – 196 Nm at 4800 rpm. per minute
• Maximum speed– 195 km/h
• Acceleration to the first hundred – 10.1 seconds
• Fuel type – gasoline AI-95
• Fuel consumption in the city – 10.4 liters
• Fuel consumption in the combined cycle – 7.8 liters
• Fuel consumption on the highway – 6.3 liters

It is worth noting that in the first generation Qashqai, this engine showed a power of 141 hp. second generation crossover with the same power unit shows a power of 144 horsepower.

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ENGINE MR20DE - NISSAN QASQAI

INSTALLING THE MR20DE ENGINE TIMING CHAIN ​​- NISSAN QASQUAYA

Note: The illustration shows the relative positions of the alignment marks on the chains and corresponding sprockets after components are installed.

1. Make sure the crankshaft key is facing straight up.

2: Camshaft sprocket (exhaust)

4: Timing chain tensioner

5: Balancing block sprocket

6: Balancing block drive circuit

7: Balancing block drive chain tensioner

8: Crankshaft sprocket

10: Camshaft sprocket (intake)

B: Alignment mark (embossed)

C: Crankshaft key (facing straight up)

D: Alignment mark (embossed)

E: Alignment mark (orange link)

R. Alignment mark (outer groove*)

2. If the timing chain tensioner guide was removed (from the front cover side), install it into the front cover.

Caution: Make sure the components engage by sound or feel.

3. Install the crankshaft sprocket (2), balancing block sprocket (3) and balancing block drive chain (1).

B: Alignment mark (orange link)

C: Alignment mark (dark blue link)

Perform installation by aligning the marks on all sprockets and on the drive chain of the balancing unit.

If the marks do not align, rotate the balance shaft slightly and align.

Attention: Make sure that the alignment marks on the sprockets do not move after installing the balancing block drive chain.

4. Secure the balance shaft to the hexagonal part (19.0 mm) (A) and tighten the balance block sprocket bolt.

: Front engine

Attention:

Fix the shaft of the balancing block by the hexagonal part.

Do not loosen the balancing block sprocket bolt while tensioning the balancing block drive chain.

5. Install the balancing block drive chain tensioner (1).

) locking pin.

Once again, make sure that the alignment marks on the balancing block drive chain and on the sprockets have not moved.

6. Align the marks on each sprocket and timing chain.

2: Camshaft sprocket (intake)

3: Timing chain

A: Alignment mark (dark blue link)

B: Alignment mark (embossed)

C: Alignment mark (outer groove*)

D: Alignment mark (orange link)

E: Alignment mark (embossed)

* There are two grooves on the periphery of the intake camshaft sprocket. The wider one is the registration mark.

If the marks do not align, rotate the camshaft slightly by grasping the hex part and align.

Attention: Make sure that the alignment marks on the sprockets do not move after installing the timing chain.

8. Install the timing chain tensioner (1).

Press the plunger in and hold it down with the locking pin (A), and install the tensioner.

9. Check again that the alignment marks on the sprockets and timing chain have not moved.

11. Install the front cover as follows:

a. Insert the new O-ring into the cylinder block.

Caution: Do not allow the O-ring to become dislodged.

b. Apply sealant (B) in a continuous strip using a syringe (suitable special tool) to the front cover as shown in the illustration.

Use original sealant or equivalent

With. Make sure the marks on the timing chain and sprockets are still aligned. Then install the front cover.

Attention:

Make sure the O-ring is inserted into the cylinder block correctly.

Do not damage the front oil seal on the front end of the crankshaft.

d. Install the front cover and tighten the mounting bolts 8 in the order indicated by the numbers in the figure.

M10: No.6,7, 10, 11, 14

M12: №№2,4,8, 12

M8: Except. above

Attention: Installation must be completed within 5 minutes after applying the sealant.

f. After tightening the bolts, tighten them to the required torque in the order indicated by the numbers in the figure.

Caution: Remove any excess sealant that has come out on the surface.

12. Install the crankshaft pulley as follows:

a. When pressing the crankshaft pulley with a plastic hammer, strike the central area (not the circumference).

Attention: Install the crankshaft pulley without damaging the edge of the front oil seal.

b. Secure the crankshaft pulley (1) with the pulley holder (A) (suitable special tool).

d. Tighten the crankshaft pulley bolt.

: 68.6 N"m (7.0 kg-m)

e. Fully weakened to OH-m (Okg-m).

f. Tighten the crankshaft pulley bolt.

: 29.4 N"m (3.0 kg-m)

9. Apply a paint mark (B) to the crankshaft pulley (2) opposite any of the six corner marks (A) on the crankshaft pulley bolt flange (1).

Check the tightening angle using the corner marks.

i. Turn the crankshaft pulley clockwise by hand and make sure it rotates freely.

13. After this operation, the installation is carried out in order, arr. removal

CHECKING AFTER INSTALLATION

CHECKING AFTER INSTALLATION

Leak check

Before starting the engine, check the oil/fluid levels, including engine coolant and engine oil. If the level is below normal, add and bring to the required level. See chapter MAINTENANCE.

Check for fuel leaks as follows:

Turn the ignition key to the “ON” position (without starting the engine). After creating pressure in the fuel lines, check for fuel leaks at the joints.

Start the engine. While increasing the engine speed, check again for fuel leaks at the joints of the fuel lines.

Run the engine and check for unusual noise or vibration.

Note: If the hydraulic pressure inside the timing chain tensioner drops after removal/installation, slack in the guide may cause a clunking noise when the engine is started and immediately thereafter. However, this does not indicate a malfunction. The knocking will stop after the hydraulic pressure rises.

Warm up the engine thoroughly and make sure there are no fuel or oil/fluid leaks, including engine coolant and engine oil.

Bleed the air from the pipes and hoses of the relevant systems, such as the cooling system.

After the engine has cooled, check the oil/fluid levels again, including engine coolant and engine oil. If necessary, top up and bring to the required level.

Check table

Component

Before starting the engine

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Good day!

Today's photo report will show the replacement of a stretched chain in an MR20DD engine, as well as the characteristic symptoms of a stretched chain on a Nissan Qashqai J11.

In our market, this engine has been installed on Nissan Qashqai J11 since 2013, and since 2014 - on Nissan X-Trail T32.

It is an in-line four-cylinder engine of the MR series with a volume of 1997 cc. cm from direct injection fuel and two variable valve timing.

A 2014 Qashqai with a mileage of 122,000 km came to us with complaints about hard start and uneven engine operation after starting.

In memory electronic unit engine management errors P0014 (ignition timing deviation from the norm) and P0300 (multiple misfires).

According to the owner, difficult starting and uneven engine operation appeared some time ago and gradually progressed.

We remove the timing cover: the main chain tensioner is extended by 16mm.

We compare the new and old chains - the stretching is significant.
Below in the photo the new chain is hung on top of the old one, you can see the stretch.

This motor was equipped with 2 revision chains, both double-row.

The tensioner itself and dampers are in good condition, so we change the chain ring (of course we install the latest revision), the front crankshaft oil seal and all the sealing rings on the engine cover.

After installing the new chain, the engine started at half a turn.

In addition, engines with direct injection are very sensitive to fuel, so it is recommended to periodically flush the injector for preventive purposes.

If you encounter similar malfunctions in engine operation or hear noises characteristic of chain stretching, do not delay replacement - thereby avoiding wear of other engine parts.

We wish everyone long and trouble-free operation of your cars!

FUNCTIONAL PURPOSE OF THE TIMING CHAIN

The Nissan Qashqai timing chain drive is part of the gas distribution mechanism and is involved in the transmission of torque from crankshaft to the distribution one. The chain can connect them directly or participate in the work indirectly, for example, combining camshafts with each other, if there are two of them, while functional purpose it remains unchanged.

Monitoring the condition of the timing chain, replacing dampers and tensioners is part of the planned maintenance car and plays an important role in engine operation vehicle. It is necessary to regularly monitor the condition of the gas distribution system, as this directly affects the vehicle’s power, sensitivity when supplying gas and fuel consumption.

FEATURES OF CHAIN ​​REPLACEMENT

In most engines of older car models, chains with roller links were used to transmit torque, often the components were in two or three rows, this made the timing chain a very reliable, almost eternal mechanism that does not require constant maintenance. Often the car traveled up to 300,000 km. and the chain of the mechanism received only lateral play, and the worst thing that could happen to the gas distribution mechanism was the links jumping; breaks were extremely rare. Over time, production price, efficiency, environmental friendliness and the weight of the car engine, which affects its power, have become trends in the creation of cars. Under these conditions, manufacturers began to strive to replace the timing chain with a lighter, cheaper and easier to maintain timing belt. And those motors whose design retained chains and roller components were replaced with lightweight plate links, more reliable than timing belts, but still not as strong as roller chains.

The Nissan Qashqai timing chain has a number of features that fundamentally distinguish it from the timing belt.

1. The chain is a durable mechanism; it wears out much longer than the timing belt; breaks do occur, but much less frequently than in belt-driven engines.

2. A break in the timing chain occurs quite rarely, which means engine breakdown, which requires expensive overhaul, does not occur often.

3. Timing chains are quite noisy, but with the modern level of car noise insulation, this parameter becomes not very important.

4. When the chain wears out, its play and lateral runout occur, this indicates the need to replace the old chain with a new one. Since the metal part sagging and lateral runout is accompanied by strong noise, it is simply impossible not to notice and not to attach significance to it. A noise under the hood will be the first “bell” indicating the need for vehicle maintenance.

5. The main disadvantage of replacing the Nissan Qashqai timing chain is that it is located inside the cylinder block and it is quite difficult to assess its condition without training and experience. In addition, dismantling and replacement, with such a device, is a long and labor-intensive process, and therefore expensive.

6. Tensioners and dampers are involved in the operation of the timing chain - these are consumable parts that wear out quickly and need more frequent replacements than the timing chain itself.

TYPES OF FAULTS

1. Timing chains, when in full working order, have a natural movement, which is compensated by tensioners when oil pressure is applied. A malfunction is considered to be a strong lateral runout of the timing chain, which appears when the links are stretched. The actual degree of chain stretch can only be determined through a qualified inspection of the gas distribution mechanism.

2. Backlash is the direct stretching of the chain, which is observed when long-term operation, can lead to jumping of chain links and malfunction of the gas distribution mechanism, this leads to a decrease in the sensitivity of the engine when the gas pedal is pressed and an increase in fuel consumption.

3. Timing chain break in Nissan Qashqai is the most dangerous damage to the engine; in the case of a chain drive motor, it does not occur often, but it does occur. If such a malfunction occurs camshaft ceases to be associated with crankshaft and can stop completely arbitrarily in a position in which any of the valves of the gas distribution mechanism is open. In this case, the piston, moving upward, may collide with the valve, which will lead to its deformation and the car engine will face serious repairs. It should be noted that a timing chain break does not occur unexpectedly; it is almost always accompanied by changes in the operation of the vehicle, a decrease in its power, a change in gasoline consumption and the appearance of extraneous noise.

To prevent and prevent the operation of the gas distribution mechanism, it is necessary to periodically troubleshoot the timing chain, this will save the car engine from breakdown and prevent premature wear engine and will increase its service life.

CAUSES OF WEAR

1. Operation of the Nissan Qashqai in extreme conditions. Frequent driving on unpaved roads, towing trailers, heavy loads, and traveling at high speeds increases the load on the crankshaft, spinning it to maximum speed, which leads to stretching of the timing chain.

2. Since the timing chain is located inside the cylinder block, it is completely washed motor oil and as a result is very sensitive to its quality. In the case of using high-quality synthetic oil containing specialized detergent additives, the service life of the timing chain is significantly increased

3. The operation of the timing chain involves parts that regulate the tension of the chain; they are consumables and require periodic replacement. During vehicle maintenance, it is necessary to check the degree of wear of the tensioner and damper, untimely replacement These parts may cause the chain to stretch and links to jump.

SIGNS OF PROBLEM

1. Increase in gasoline consumption by car;

2. Reduced engine power; 3. The appearance of clanging and noise under the hood of the car when the engine is running;

4. A complete stop of the car while moving; when you try to start, the engine does not start, and the starter rotates more easily than usual;

5. Unstable operation of the Nissan Qashqai engine at idling and in motion;

6. The occurrence of shots in the injector receiver and exhaust pipe.

All these problems may indicate a shift in the valve timing and loosening of the chain tension. If you notice one or more signs of this list on your car, immediately contact a service station for an inspection.

HOW OFTEN DO YOU NEED TO REPLACE THE TIMING CHAIN?

Replacement frequency of any consumables For Nissan cars Qashqai depends on the driving style and operating mode of the car. With an extreme driving style and aggressive use of the vehicle, it is necessary to replace the timing chain as it becomes loose and wears out.

Under normal operating conditions, it is necessary to replace the timing chain as planned, every 100 - 150,000 km. mileage If your car has an analog belt, replacement must be done a little earlier than the time recommended by the vehicle manufacturer.

Trust your car only to professional specialists who are capable of competently troubleshooting the timing chain, assessing lateral runout and play, replacing and adjusting the operation of tensioners, chain drive “pretensioners” and replacing the Nissan Qashqai timing chain.