Replacement exhaust pipe (or "spider") on Nissan Terrano - one of those procedures that sooner or later owners of diesel and gasoline versions of this SUV have to perform. The reasons may be metal burnout, corrosion, mechanical damage or simple wear and tear after 150–200 thousand kilometers. Unlike many European crossovers, Terrano (especially models R51 And R20) the design of the exhaust system has its own characteristics, which are important to consider during repairs.

This article will help you figure out how to replace the exhaust pipe yourself, without resorting to the services of a service station, saving up to 8–12 thousand rubles. We will consider in detail the choice of spare parts (original vs analogue), the necessary tools, a step-by-step algorithm of work and typical mistakes that beginners make. We will pay special attention to the nuances for diesel engines YD25DDTi and gasoline QR25DE, since their exhaust systems are different.

Signs of a faulty exhaust pipe: when is it time to change it

The first signal about problems with the exhaust pipe is change in exhaust sound. If your Terrano began to “growl” or “shoot” during acceleration, and a burning smell appeared in the cabin, most likely a crack or burnout had formed in the pipe. Other symptoms:

  • 🔊 Loud bang when gas is released - a classic sign of system depressurization.
  • 🚗 Vibration on the body or steering wheel when the engine is idling.
  • 💨 Black smoke from under the bottom (especially on diesel Terrano with YD25).
  • ⚠️ Error P0420 (low catalyst efficiency) on the dashboard.

On diesel versions, the malfunction is often disguised as problems with diesel particulate filter (DPF) or EGR valve. To accurately diagnose a pipe breakdown, inspect it on a lift or overpass: cracks usually appear in places where welds are made or where they are attached to the collector. On petrol Terrano with QR25DE The flange connection to the catalyst most often suffers.

⚠️ Attention: If you ignore the burnout of the exhaust pipe, this will lead to exhaust gases entering the cabin through the ventilation system. In diesel engines, this is fraught with carbon monoxide poisoning, and in gasoline engines, there is a risk of fire due to sparks breaking through cracks.

Selection of spare parts: original or analogue?

Original exhaust pipe for Nissan Terrano has an article number 20620-4M00A (for diesel YD25DDTi) and 20620-5M000 (for gasoline QR25DE). The cost of a new part from an official dealer starts from 18–25 thousand rubles, which stops many. Alternative options:

Brand Article Price, ₽ Features
Bosal 254-134 8 500–10 000 Good quality metal, but may not fit the mounts to the body.
Walker 38215 9 200–11 000 A complete analogue of the original, but the thickness of the steel is 0.3 mm thinner.
Asam 30620 6 800–8 000 A budget option, often requires modification by welding.
Febi 20620 12 000–14 000 Premium analogue, suitable for turbocharged diesel engines.

When choosing an analogue, pay attention to metal thickness (optimally 1.5–2 mm) and the presence reinforced welds. Cheap Chinese pipes (for example, Delphi or nameless brands) often burn out after 30–50 thousand km. For diesel Terrano availability is critical thermal shield - without it, the pipe will overheat and fail faster.

📊 Which downpipe do you prefer to install?
  • Original Nissan
  • Analogue (Bosal, Walker)
  • Budget option (Asam, Delphi)
  • I don't know what to choose

Tools and preparation for work

To replace the exhaust pipe with Nissan Terrano you will need:

  • 🔧 Head set (10, 12, 14, 17 mm) with extension.
  • 🔨 Socket wrench by 17 mm for bolts attaching to the manifold.
  • 🔥 Gas burner or WD-40 for stuck nuts.
  • 🛠️ Hammer and chisel (in case of broken bolts).
  • 🔧 Torque wrench (for tightening with a torque of 40–50 Nm).
  • 🚗 Jack and stops (or access to the overpass).

Before starting work, be sure to:

  1. Cool the engine (working on hot exhaust is dangerous!).
  2. Disconnect the negative terminal of the battery.
  3. Remove the crankcase protection (if equipped).
  4. Treat all threaded connections penetrating lubricant 1–2 hours before repair.

Cool the engine|Disconnect the battery|Remove the crankcase protection|Treat the bolts with WD-40|Prepare new gaskets-->

⚠️ Attention: On diesel Terrano Before removing the pipe, you must unscrew the oxygen sensor (lambda probe), otherwise there is a risk of damaging its wiring. On gasoline models, the sensor can be left in place, but carefully moved to the side.

Step-by-step instructions for replacing the exhaust pipe

The replacement process takes 2–4 hours depending on the condition of the bolts and the experience of the technician. Let's consider the algorithm using the example of a diesel engine. Nissan Terrano R51 with engine YD25DDTi:

  1. Removing the old pipe:
    1. Unscrew the two bolts securing the pipe to catalytic converter (14 mm wrench).
    2. Disconnect the pipe from exhaust manifold (three 17 mm bolts). This is where problems most often arise - bolts often stick. If not, use a gas burner to heat it up.
    3. Remove the rubber pipe hangers (it is better to replace them with new ones, article no. 20632-4M000).
  2. Installing a new pipe:
    1. Check integrity manifold gaskets (article 14045-4M000). If it is torn or burnt, replace it.
    2. Install the new pipe, starting with the attachment to the manifold. Tighten the bolts criss-crossto avoid skew.
    3. Connect the pipe to the catalyst and secure the rubber hangers.
  3. Check:
    1. Start the engine and check for air leaks (listen for hissing).
    2. Inspect the connections for exhaust leaks (you can use a soap solution).

On petrol Terrano with QR25DE the algorithm is similar, but there is a nuance: the exhaust pipe is attached to the manifold through spring bolts. They must not be overtightened - the maximum tightening torque is 35 Nm. Also on gasoline versions, replacement is often required corrugations (article 20625-4M000), as it loses elasticity over time.

What to do if the bolt breaks off?

If the bolt securing the pipe to the manifold breaks off, do not try to drill it out right away. First try:

1. Heat the fastening area with a gas burner (the metal will expand and the remaining bolt can be unscrewed).

2. Use an extractor or a left-handed drill (diameter 0.5 mm smaller than the bolt).

3. As a last resort, drill out the bolt and cut a new thread using an M10×1.25 tap (for Terrano this is the standard size).

Common mistakes and how to avoid them

Even experienced craftsmen sometimes make mistakes when replacing the exhaust pipe. Here are the most common:

  • 🔧 Bolt tightening — leads to flange deformation or thread breakage. Always use a torque wrench!
  • 🔥 Ignoring gaskets - an old or damaged manifold gasket will cause air leaks and an error P0420.
  • 🛠️ Incorrect tightening sequence — first attach the pipe to the manifold, then to the catalyst.
  • 🚗 They forget about the sensors - on diesel Terrano it is necessary to disconnect the connector of the exhaust gas temperature sensor (part number 226J0-4M000).

Critical error: using sealant instead of gaskets. On Nissan Terrano the sealant (even a high-temperature one) cannot withstand heating above 600°C and begins to crumble, clogging the catalyst. If the gasket is not original, check its material - it should be from metal ceramics, and not from ordinary cardboard.

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Before installing a new pipe, clean the manifold and catalyst flanges from carbon deposits with a wire brush. This will ensure a tight fit between the gaskets and prevent leaks.

Nuances for diesel and gasoline engines

Exhaust system design Terrano with diesel YD25DDTi and gasoline QR25DE has key differences:

Parameter Diesel YD25DDTi Gasoline QR25DE
Pipe material Carbon steel with thermal shield Stainless steel (0.5 mm thinner)
Attaching to the manifold 3 M10 bolts (torque 50 Nm) 3 spring bolts (torque 35 Nm)
Sensors Lambda probe + exhaust temperature sensor Lambda probe only (1 or 2 pcs.)
Common problem Burnout at the place of attachment to the turbine Cracks in the corrugation or flange of the catalyst

On diesel Terrano after replacing the pipe an error may appear P0401 (insufficient EGR flow). This is due to a change in back pressure in the system. The solution is to reset adaptations via a diagnostic scanner (for example, Launch X431) or drive 50–100 km in mixed mode.

On gasoline versions, after installing a non-original pipe, it sometimes works Check Engine with code P0430 (low catalyst efficiency). The reason is that cheap pipes often lack resonator, which changes the frequency characteristics of the exhaust. In this case, flashing the ECU for Euro-2 or installing a fake lambda probe will help.

Cost of service work vs independent replacement

Prices for replacing the exhaust pipe in car services vary depending on the region and type of service station:

  • 🔧 Official dealer: 8,000–12,000 ₽ (plus the cost of spare parts).
  • 🛠️ Independent service: 3 500–6 000 ₽.
  • 🏠 On your own: 0 ₽ (only the price of spare parts and tools).

Savings when replacing yourself can be up to 15,000 ₽, but it is important to consider the risks:

  • Damage to the threads in the manifold (repair will cost 2,000–4,000 ₽).
  • Incorrect tightening of bolts leading to leaks (diagnosis - 1,000 ₽).
  • Damage to oxygen sensors (replacement - from RUB 3,000 per piece).
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If you have never worked on an exhaust system, it is better to entrust the replacement to professionals. Errors when installing the pipe can lead to exhaust gases entering the cabin or failure of the catalyst (the cost of a new one is from 25,000 rubles).

FAQ: Frequently asked questions about replacing the exhaust pipe

Is it possible to drive with a burnt exhaust pipe?

Short term - yes, but it is dangerous. On diesel Terrano The risk of carbon monoxide poisoning is higher because the exhaust gases are more toxic. On gasoline versions, a burnt pipe can cause overheating of the catalyst and its destruction (crumbs will clog the exhaust system). The maximum mileage with such a malfunction is 500–1000 km.

Do I need to change gaskets when replacing a pipe?

Definitely! Old gaskets (especially between the manifold and the pipe) lose their elasticity and do not provide a tight seal. Cost of a set of gaskets for Terrano — 800–1,500 ₽. Ignoring their replacement will lead to air leaks and errors. P0420/P0430.

What sealant can be used for flanges?

On Nissan Terrano sealant is used only in extreme cases (for example, if it is not possible to buy a gasket). Suitable options:

  • Permatex Ultra Copper (withstands up to 1100°C).
  • Loctite 5980 (for highly loaded connections).

Apply a thin layer only to a clean flange surface. Do not use silicone sealants!

What to do if a whistle appears after replacing the pipe?

Whistling indicates air leak in one of the connections. Check:

  1. The tightness of the gasket to the manifold.
  2. Tightening the clamps on the corrugation (if any).
  3. The integrity of the rubber pipe hangers (they can crack over time).

For diagnostics, use a smoke generator or soap solution (apply to connections while the engine is running).

How long does the exhaust pipe last on a Terrano?

The service life depends on the driving style and the quality of the spare part:

  • Original pipe: 150–200 thousand km.
  • High-quality analogue (Bosal, Walker): 100–150 thousand km.
  • Budget options (Asam, Delphi): 30–80 thousand km.

On diesel Terrano the pipe wears out faster due to higher exhaust temperatures. External surface treatment will help extend service life heat-resistant paint (For example, Bosny Heat Resistant).