Replacing timing chain mr20de photo report

Thermostat overheating or insufficient heating of the internal combustion engine replacement of consumables VVT valve crackling, motor “troits” valve replacement Throttle valve speed floats when clogged cleaning together with the TPS sensor Fuel filter poor gasoline supply, ragged modes, floating speed filter replacement

The engine is quite sensitive to the quality of fuel, so you should refuel at official petroleum products dealers. For example, with a low octane number of gasoline, the compression may decrease to 8 - 9 units, the injectors will stick, and the car will not start after parking. Draining the fuel and flushing with a special liquid will help.

Repair QR25DE

Nissan Note chain replacement

The first generation Nissan Note cars were equipped with 1.4 liter CR14DE and 1.6 liter HR16DE chain engines. Both power units are 16-valve, four-cylinder, with four valves per cylinder. According to the factory regulations, it is recommended to replace the Nissan Note chain every 120 thousand km, but usually chain drives on the Note model last much longer; many car owners replace it after 150 thousand km. Timing parts will last longer if you fill the engine with good oil and change it on time.

Signs of a faulty chain drive:

The cause of the malfunction may not necessarily be a stretched chain; the tensioner also fails. To eliminate the defect, you should change the tensioner; this work is simple and does not take much time.

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.

Tips and Cautions

It would be a good idea to replace the oil seal. Also, while the belt is removed, it is recommended to inspect the compressor and tensioner bearings and replace them if there are any unusual sounds or play. When assembling QR20DE parts, the bolts must be lubricated with grease so that they do not acidify and are easier to unscrew.

Timing chain tensioner QR20DE

Please note that the crankshaft cannot be rotated counterclockwise, since the timing chain may stretch in the opposite direction, push through the tensioner and slip (therefore, the marks will be knocked off).

REMOVAL

1. Remove the front right wheel.

2. Remove the protective trim from the front right fender. See chapter INTERIOR AND EXTERIOR EQUIPMENT.

3. Drain the engine oil. See chapter LUBRICATION SYSTEM AND ENGINE COOLING SYSTEM.

Caution: Perform this operation when the engine is cold.

4. Remove the following components:

• intake manifold; see above;

5. Set the piston of cylinder No. 1 to TDC on the next compression stroke. way:

A. Rotate the crankshaft pulley (1) clockwise and align the timing mark (colorless mark) (B) with the timing indicator (A) on the front cover.

C: White paint mark (not used for maintenance)

b. At the same time, make sure that the cam lobes of the intake and exhaust camshafts of cylinder No. 1 face each other as shown in the figure.

1: Intake camshaft

2: Exhaust camshaft

• Otherwise, turn the crankshaft pulley one more revolution (360′) and align them as shown in the figure.

6. Remove the crankshaft pulley as follows:

A. Fix the crankshaft pulley (1) with a holder (suitable special tool) (A), loosen the crankshaft pulley bolt so that it moves 10 mm from its original position.

Nissan Almera timing chain replacement

Nissan Almera was produced in two generations, the cars of the first version (N15) were produced from 1995 to 2000, the car was equipped with GA14DE and GA16DE gasoline engines with volumes of 1.4 and 1.6 liters, as well as a two-liter SR20DE internal combustion engine, which went into production on Almera with 1996. GA14 and GA16 differ from each other only in cylinder volumes; the engines are identical in design.

The Nissan Almera N16 was produced from 2000 to 2006, and was mainly equipped with 4-cylinder gasoline engines QG15DE (1.5 l) and QG18DE (1.8 l). All of the listed engines on the Nissan Almera are with a timing chain drive; the gas distribution mechanism on these engines is very reliable. The first signs of a malfunction begin to appear no earlier than after 200 thousand km, but if the timing belt becomes noisy, you should change the entire kit, which includes (for QG series internal combustion engines):

The timing kit for GA engines includes two chains, respectively, and two tensioners, but there is no upper damper. The timing kit SR20DE (2.0L) includes one chain, upper and side stabilizers, shoe, tensioner, crankshaft and camshaft gear (2 pieces). Replacing the timing chain of a Nissan Almera SR20DE is done in a standard way - the front part of the engine is disassembled, the valve cover and crankcase (sump) are also removed.

Symptoms

engine error due to timing discrepancy
poor starting on cold start
knocking noises in the engine compartment when the internal combustion engine is running (from the timing drive side)
spins for a long time
poor engine thrust
high fuel consumption
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

A timing chain with production part number 130281KC0A is installed on a Qashqai with a motor (1.6). The closest timing chains in terms of identity will be from the manufacturers Pullman 3120A80X10 and CGA 2CHA110RA.

Replacing the timing chain of Nissan Primera

The Nissan Primera in the P10 body debuted for the first time in 1996, then two more generations were released (P11 and P12), the model was discontinued in 2008. All Primera gasoline power units had a timing chain drive; the following engines were installed on the vehicles:

Primera engines of the QR series were also installed on Nissan X-Trail, Serena, Teana cars; this power unit replaced the engines of the SR model. Changing the timing kit on QR engines yourself is quite difficult; it is better to trust such work to specialized car services. In terms of time, replacing a Nissan Primera timing chain with a QR internal combustion engine takes on average from 9 to 12 hours, and without good plumbing skills such a repair can take a long time.

How much does it cost and what chain to install?

On Qashqai with engine (1.6), a timing chain is installed, production part number 130281KC0A. The closest timing chains in terms of identity will be from the manufacturers Pullman 3120A80X10 and CGA 2CHA110RA.

Prices for these products vary from 1500 to 1900 rubles. For a Qashqai with a 2.0 engine, the chain with Nissan catalog number 13028CK80A will correspond. For an alternative replacement, timing chains ASParts ASP2253, price 1490 rubles, or Ruei RUEI2253, cost 1480 rubles, are also suitable.

List of internal combustion engine modifications

In the literal sense, the QR25DE motor has only two modifications:

Turbine for QR25DER Modification QR25DD

Factory boost made it possible to install a turbo engine on first-generation Infiniti JX35 and QX60 cars. The second version of the QR25DD was used in Nissan Primera cars. All attachments, with the exception of the TVS EATON compressor, remain unchanged.

However, the manufacturer changed the configuration of the QR25DE engine on-board system settings when installed on different minivans, sedans and SUVs, resulting in different characteristics:

Thus, by flashing the ECU, the user can do this at a service station using the appropriate equipment.

Timing drive of Nissan Qashqai 2.0 engine

Timing drive Nissan Qashqai 2.0 chain

. There are two chains. One larger one rotates the camshaft sprockets, the second a small one rotates the oil pump sprocket. With intensive use, the chain begins to stretch after 100,000 miles. This leads to phase shifts that 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. the second generation of the crossover with the same power unit shows a power of 144 horsepower.

Nissan X Trail: timing chain replacement

The Nissan X-Trail was produced in three generations - T30, T31 and T32, the crossover has been produced since 2001. The T30 engine line is represented by two four-cylinder power units QR20DE and QR25DE; in the T31 generation, the MR20DE engine began to be installed instead of the two-liter MR20DE.

On QR engines, the chain can stretch at a mileage of closer to 150 thousand km; signs of a malfunction include:

On a Nissan X Trail, when replacing the timing chain (engine MR20DE), the following are included in the kit:

The crankshaft gear is a double-row gear, with its help the camshafts and the engine balance shaft are driven from the crankshaft.

Design of the Qashqai 2.0 liter engine.

The in-line 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 the valve timing on the intake shaft is implemented using a hydraulic system. An increase in pressure causes an increase in the deviation of the camshaft from the nominal position relative to the valve axes. The oil pressure level is regulated by a solenoid valve controlled by the electronics of the Nissan Qashqai engine.

Instructions

How to replace the timing chain with your own hands on 1.6 and 2.0 engines:

Drive the car onto a pit or lift. Remove the right wheel.
Unscrew and remove the engine cover. Remove the exhaust manifold.
Drain all engine oil from the engine.
Unscrew the bolts and remove the cylinder head cover.
Rotate the crankshaft and place the number one cylinder piston in the TDC compression position.
Raise the power unit with a jack. Unscrew and pull out the engine suspension support on the right side.
Remove the alternator belt.
Using a special puller, holding the crankshaft pulley from turning, unscrew its mounting bolts by 10-15 mm.
Using puller KV111030000, pull the pulley off the crankshaft. Completely unscrew the pulley mount and remove the roller.
Unscrew and pull out the suspension belt tensioner.
Disconnect the harness connector from the variable valve timing system valve.
Pull out the solenoid valve, having first unscrewed the bolt on which it is attached.
This allows access to the side cover of the engine, under which the timing chain is located. Using a ratchet and sockets, remove the bolts securing this cover. Cut the sealing seam with a knife and remove the cover.
Press out and fix the tensioner using for this purpose a one and a half millimeter rod inserted into the hole. Unscrew the bolt located on top with the bushing on which the chain guide is attached, and remove the guide itself. Do the same with the second guide.
Now, finally, you can pull out the timing chain. To do this, you need to remove it first from the crankshaft sprocket, and then from the pulleys. If the fastening of the tensioner interferes, then remove it too.
After that, it's time to start installing the new chain. The procedure is the reverse of that for removal. It is important to match the marks on the chain with the marks on the pulleys.
Carefully remove any remaining sealant from the joints of the cylinder block and timing cover. Then carefully apply fresh sealant, trying not to exceed a thickness of more than 3.4-4.4 mm.
Replace the timing cover and tighten the bolts. Install the remaining parts in the reverse order of dismantling.

The timing belt is installed in a similar way on a Qashqai with a 1.5 diesel engine. An important point - before removing the old belt, you need to place marks with a marker on the camshaft, pulley and head, marking the correct location. This will help you install the new belt without any problems.

How to replace a mechanism chain

When working with the timing chain on a Nissan Qashqai 2L or other gasoline engines, done with your own hands, you must follow the following sequence of actions:

Remove the right front wheel.

Then you should remove the fender liner and drain the oil.

Attention! It is important to carry out all work with a cold engine!

The first cylinder is set to the compression stroke: the crankshaft pulley rotates clockwise, with the TDC marks aligned with the gear indicator.
The belt located on the tensioner drive is removed.
Next, the intake manifold and valve cover are removed.
The crankshaft pulley and engine support are removed.
The oil pan is removed.
The next step is to remove the engine cover, for which the bolts are loosened, the front oil seal is removed from the cover, which must be pryed off with a screwdriver.
Then the tensioner, damper and the timing chain itself are removed.

The next step is to install a new part of the gas distribution mechanism.