Removing a turbocharger on a popular crossover Nissan Qashqai - a task that requires not only the availability of tools, but also a deep understanding of the design of the power units of the series MR or MR20DD. Owners are often faced with the need to replace a unit due to oil starvation or mechanical wear of bearings, which entails a complex procedure for disassembling the engine compartment. Ignoring the nuances during removal can lead to damage to fragile intercooler pipes or throttle position sensors, which will create additional problems during assembly.
The turbine removal process differs depending on the year of the vehicle and engine size. On models with diesel engine 1.5 dCi access to the unit is much more difficult due to the dense arrangement of attachments, while on gasoline versions 2.0 the work goes faster, but requires care when working with turbocharged hoses. You will be faced with the need to disconnect hundreds of fasteners, each of which has its own specifics and tightening torque.
Preparing the workplace and tool kit
Before starting physical impact on the components, it is necessary to ensure safe working conditions and prepare specialized tools. A standard set of wrenches is often insufficient to access deep turbocharger mounting bolts, especially in the exhaust manifold area. You'll need extension wrenches, universal joints, and a set of sockets with extensions to reach hidden mounting points.
Specifics of the engine compartment Nissan Qashqai dictates the need to use a set of torque wrenches for subsequent assembly. It is also extremely important to have containers for draining technical fluids on hand, since when the oil supply and oil receiving lines are disconnected, draining them is inevitable. Do not forget to prepare rags to protect adjacent components from oil and antifreeze.
- 🔧 Set of sockets from 8 to 19 mm with extensions and cardans
- 🛢️ Containers for collecting used oil and antifreeze
- 📄 Gloves and safety glasses for working with chemicals
- 💡 Powerful flashlight for illuminating hard-to-reach areas
Turning off the electrical and cooling system
The initial stage of work always begins with de-energizing the system and removing liquids circulating in the turbine cooling circuits. Turbocharger on Nissan has a complex cooling circuit, including both an oil circuit and a separate channel for antifreeze circulation. It is necessary to carefully disconnect the electrical connectors from the boost pressure and exhaust gas temperature sensors to avoid their damage when dismantling the housing.
The coolant in the system is under pressure, so allow the engine to cool completely before unscrewing the hoses. Open the expansion tank and drain some of the antifreeze through the lower radiator pipe to minimize losses when disconnecting the turbine tubes. Use special clamps or clamps to temporarily seal disconnected pipes, preventing engine contamination.
⚠️ Attention: Do not use pliers to remove the spring clamps on the cooling pipes - this may deform the seat and lead to leakage during assembly. Use special pliers or carefully pry with a screwdriver.
- 🔌 Disconnect the negative terminal of the battery
- ❄️ Relieve pressure in the cooling system before unscrewing
- 🔩 Mark connectors and hoses for correct subsequent installation
Removing the exhaust system and intake tract
The most time-consuming step is freeing the turbocharger from its connections with the exhaust manifold and intake pipe. On Nissan Qashqai The bolts securing the flange to the manifold often become stuck due to high temperatures and corrosion. It is recommended to pre-treat the connections with a penetrating lubricant and give it time to act so as not to strip the threads when unscrewing.
The intercooler inlet pipe also requires attention, as it has a complex shape and is secured with many clamps. It is necessary to disconnect the mass air flow sensor (MAF) and remove the corrugation leading to the throttle body. This will allow access to the top of the turbine and allow the assembly to be manipulated freely.
- Gasoline 2.0 (MR20)
- Diesel 1.5 (K9K)
- Diesel 1.6 (R9M)
- Gasoline 1.2 (H5F)
Disconnecting oil lines
A critically important point that requires maximum care is disconnecting the oil supply and oil receiving pipes. These lines are often made of aluminum alloy and are very fragile if abused. When unscrewing the return fitting, be prepared for residual oil to pour out of the hole, so place a container.
To remove the oil pickup tube, it may be necessary to remove the lower oil pan or access from underneath the vehicle through an inspection hole. Make sure the threaded connections are clean and free from damage. If the thread is broken, the tube will need to be replaced, since the use of sealant in the turbine lubrication system is unacceptable.
☑️ Checking readiness for turbine removal
Final dismantling of the turbocharger housing
After all connections are disconnected, you can begin to unscrew the main bolts securing the housing to the bracket or manifold. At this stage, difficulties often arise due to access to the upper bolts, which are hidden behind suspension parts or other assemblies. Use flexible extensions and universal joints to ensure proper torque on the wrench.
The turbine itself must be carefully removed, holding it with your hand, so as not to damage the fragile blades of the compressor or turbine in contact with other parts. Exit the assembly vertically upward or at an angle, depending on the design of the particular body.
Features of removal from the MR20DD engine
On MR20DD engines with direct injection, access to the turbine is complicated by the presence of a variable valve timing system and a complex fuel supply circuit. Removal of the intake manifold assembly is required.
Inspection and testing of the removed unit
After removing the turbocharger, a thorough visual inspection should be carried out for external damage. Check the integrity of the housing, the absence of cracks on the blades and the condition of the bearing basket. Turning the shaft by hand should be easy and smooth, without jamming or beating.
It is also worth checking the condition of the oil channels inside the removed unit. If you see coked oil residues, this indicates that the engine is overheating or low-quality oil is being used. This is critical information for deciding whether to repair or replace the unit.
⚠️ Attention: Never check the turbine shaft play by applying force along the shaft axis - this can lead to deformation of the thrust bearings and jamming of the unit. Check radial play only.
| Validation parameter | Normal condition | Symptoms of a problem |
|---|---|---|
| Shaft rotation | Free, no noise | Jamming, metallic grinding noise |
| Radial play | 0.05–0.10 mm | More than 0.15 mm |
| Axial displacement | Missing | Backlash more than 0.5 mm |
| Condition of the blades | Whole, no chips | Cracks, chips, deformation |
Before installing a new or repaired turbine, be sure to flush the oil line with compressed air and replace the oil filter to prevent old lubricant particles from getting into the new unit.
Installation features and final assembly
The process of installing a new turbine is a mirror image of dismantling, but requires increased attention to the tightening torques of the bolts. All gaskets and O-rings must be replaced with new ones. Use only original consumables, as poor-quality gaskets may not withstand thermal expansion and lead to oil or exhaust leaks.
Before starting the engine for the first time after installing the turbine, it is necessary to bleed the lubrication system. This is done by cranking the engine with the starter with the ignition system turned off for 10-15 seconds. This will ensure that oil is supplied to the bearings until startup, preventing dry friction and seizing.
- 🛠️ Observe the bolt tightening torques specified in the service manual
- 🔄 Replace all O-rings and gaskets with new ones
- ⛽ Fill with fresh oil and check the level before starting
- 🔍 Check for leaks at idle and under load
The main reason for turbine failure after repair is the entry of fine dust or old oil into the lubrication system of the new unit. Thorough flushing of the lines is mandatory.
How do you know when the turbine needs to be removed?
About the need to dismantle and replace the turbocharger Nissan Qashqai indicate: increased oil consumption (blue smoke from the exhaust pipe), whistling or howling from under the hood, loss of engine power and increased fuel consumption. Boost errors may also light up on the dashboard.
Is it possible to remove the turbine without removing the engine?
Yes, on most models Nissan Qashqai with engines MR and K9K The turbine can be removed without removing the engine. However, it will be necessary to remove a number of attachments, a subframe or engine protection, depending on the year of manufacture and modification.
Do I need to flush the oil passages before installation?
Absolutely necessary. Even a small amount of old, oxidized grease or metal shavings can cause new bearings to seize instantly. Flushing with compressed air and replacing the filter are mandatory steps.
How long does it take to remove a turbine?
For an experienced craftsman with the right tools, the process takes 4 to 6 hours. A novice car enthusiast may need twice as much time, especially at the stage of unscrewing stuck exhaust manifold bolts.