Drive belt in Nissan Terrano (especially models R51 And R52 with engines MR20DE, QR25DE or diesel YD25DDTi) is a critical element on which the operation of the generator, power steering (power steering), air conditioning compressor and pump. If it breaks or slips, it can lead to battery discharge, engine overheating, or loss of control. In this case, the belt drive diagram on Terrano differs depending on the configuration: with or without air conditioning, with mechanical/electric power steering.

In this article you will find official drive belt diagrams for all modifications Nissan Terrano, including dimensions and part numbers of the original belts, as well as step-by-step replacement instructions with photos and videos. We will look at typical tensioning errors, signs of wear, and the nuances of working with tension rollers. If you plan to change the belt yourself, here's everything you need to do it right the first time.

Official drive belt diagrams for Nissan Terrano (R51/R52)

The belt drive pattern depends on engine type And vehicle configuration. Below are the current diagrams for the most common versions Terrano:

  • 🔧 Petrol MR20DE (2.0 l) without air conditioning - the simplest option with one tension roller.
  • ❄️ Petrol MR20DE/QR25DE (2.0/2.5 l) with air conditioning — a compressor pulley has been added, a longer belt is required.
  • ⚡ Diesel YD25DDTi (2.5 l) — separate circuit taking into account high torque.
  • 🚗 Models with power steering (hydraulic booster) — additional booster pump pulley.

For an exact definition of the circuit, check VIN code your Terrano or check the table below:

Engine Equipment Belt diagram Belt length (original) Original article number
MR20DE Without air conditioning, without power steering 4PK885 885 mm 11920-4M50A
MR20DE With air conditioning, with power steering 6PK1720 1720 mm 11920-1KA0A
QR25DE With air conditioning 6PK1800 1800 mm 11920-9J000
YD25DDTi Diesel, with power steering 6PK2130 2130 mm 11920-ED010

Attention! On diesel Terrano (YD25DDTi) is used double strand belt (6PK) with reinforced structure due to high load. Installing a regular belt will cause it to quickly stretch and break.

📊 What engine does your Nissan Terrano have?
  • MR20DE (2.0 petrol)
  • QR25DE (2.5 petrol)
  • YD25DDTi (2.5 diesel)
  • Other

Signs of a worn drive belt: when is it time to change it?

Drive belt Nissan Terrano does not have a strict replacement schedule based on mileage (unlike the timing belt), but the manufacturer recommends checking its condition every 30–40 thousand km. The main signs that the belt requires replacement:

  • 🔊 Whistling or squeaking when starting the engine or when the load increases (turning on the air conditioner, headlights).
  • 🔍 Cracks or delaminations on the inside/outside of the belt (visible during visual inspection).
  • 📉 Slippage — dim headlights, low battery, overheating of the engine (due to the pump stopping).
  • 🔄 Uneven wear — one side of the belt wears out faster than the other (problem with the tension roller).

It is especially dangerous to ignore belt delamination - its particles can get into the pulleys and damage the bearings of the generator or air conditioning compressor. On diesel Terrano a worn belt often leads to cliff, which is fraught with loss of control (if it breaks on the move).

⚠️ Attention: If the whistle does not go away after replacing the belt, the problem may be jammed tension roller or worn pulleys (especially the generator). Check their play by hand with the engine off.
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Before buying a new belt, measure the length of the old one with a tape measure - sometimes even the original part numbers may not match the actual dimensions due to engine modifications.

Step-by-step instructions for replacing the drive belt

Replacing the belt with Nissan Terrano does not require special tools, but will be required tension roller wrench (usually on 14 mm or 15 mm) and a jack for removing the right front wheel (for access to the crankshaft pulley). It is more convenient to perform the work on a viewing hole or a lift.

Sequence of actions:

  1. Removing the old belt:
    • Loosen the tension roller by turning it counterclockwise (use the wrench on 14 mm).
    • Remove the belt from the pulleys, remembering or photographing its position.
  2. Checking pulleys and rollers:
    • Turn all the pulleys by hand - they should rotate without play or extraneous sounds.
    • Inspect the tension roller: if it rustles or has play, replace it.
  3. Installing a new belt:
    • Place the belt on the pulleys according to the diagram (see section above).
    • Tension the belt by turning the roller clockwise and lock it in this position.

For models with air conditioning and power steering, the order in which the belt is installed is important. For example, on MR20DE with air conditioning, the belt must first be put on the crankshaft pulley, then on the alternator, air conditioning compressor and pump.

Loosen the tension roller|Take a picture of the belt diagram|Check the pulleys for play|Buy a belt according to the article number (see table)|Prepare a 14 mm wrench for the pulley-->

How to properly tension a belt: nuances and mistakes

Incorrect belt tension is the most common cause of premature belt wear. On Nissan Terrano used automatic tension roller (on most modifications), but even it requires proper installation. The optimal tension is checked as follows:

  • 📏 Belt deflection between the generator and crankshaft pulleys there should be 8–10 mm when pressed with force 10 kgf.
  • 🔧 Roller position — after tensioning, it should be in the middle position (not rest against the stops).
  • 🔄 Check after launch — after 5 minutes of engine operation, the belt may stretch a little and will require tightening.

Typical mistakes when stretching:

  1. Too much tension — leads to wear of the generator and pump bearings.
  2. Weak tension — the belt slips, whistles, and the battery does not charge enough.
  3. Belt distortion - if it is offset relative to the pulleys, the edges quickly wear out.

On diesel Terrano (YD25DDTi) belt tension is critical - a weak belt can slip at high torque, and a too tight belt can damage the crankshaft bearing.

What happens if you tighten the belt?

An overtightened belt creates excess load on the pulley bearings, which leads to their premature failure. The generator and pump are especially vulnerable - their bearings can “jam” after 10–15 thousand km. In addition, excessive tension increases the risk of belt breakage due to microcracks.

Belt selection: original vs analogues

Original belts from Nissan (see the table above for article numbers) guarantee a long service life, but their price is often inflated. High-quality analogues can last no less if installed correctly. The best analogue brands for Terrano:

Brand Article number (for MR20DE with air conditioning) Price, rub. Features
Gates 6PK1720 1 200–1 500 Reinforced structure, low noise
Contitech 6PK1720 1 000–1 300 Good elasticity, suitable for cold climates
Dayco 6PK1723 900–1 100 Budget option, can stretch faster
Mitsuboshi 6PK1720 1 400–1 700 Japanese quality, long service life

When choosing an analogue, pay attention to:

  • 🔍 Belt type - for Terrano used 6PK (six-wedge) or 4PK (four wedge).
  • 📏 Length - even a slight deviation (for example, 6PK1720 instead of 6PK1723) can lead to tension problems.
  • 🏷️ Country of manufacture — avoid cheap belts from China without a brand.

Important: On diesel Terrano (YD25DDTi) it is not recommended to use analogues - only the original or Gates/Mitsuboshi due to high loads.

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Saving on a drive belt is more expensive: a break while driving can damage the generator (from 10,000 rubles for repairs) or the pump (from 5,000 rubles).

Common problems after replacing a belt and their solutions

Even after correctly replacing the belt with Nissan Terrano Malfunctions may occur. Let's look at typical situations and ways to eliminate them:

  • 🔊 Whistle after replacement:
    • Reason: weak tension or dirt on the pulleys.
    • Solution: tighten the belt or clean the pulleys with alcohol.
  • 🔥 Engine overheating:
    • Cause: The belt is slipping on the pump pulley.
    • Solution: check the tension and condition of the pump pulley.
  • ⚡ Battery undercharge:
    • Reason: belt slipping on the generator pulley.
    • Solution: check the tension and condition of the generator.
  • 🔄 Belt slips off pulleys:
    • Reason: belt size mismatch or pulley wear.
    • Solution: Replace the belt with an original one and check the pulleys.

If after replacing the belt there is extraneous noise (for example, a hum or grinding sound), most likely the problem is tension roller or pulley bearings. On Terrano With a mileage of >150 thousand km, the generator bearings often wear out - they should be checked in advance.

⚠️ Attention: On petrol Terrano (MR20DE/QR25DE) after replacing the belt may light up check engine due to a faulty crankshaft position sensor. In this case, you need to reset the error using a diagnostic scanner or disconnect the battery for 10 minutes.

Video instructions and additional materials

For clarity, we recommend that you watch the video on replacing the drive belt with Nissan Terrano:

If this is your first time changing a belt yourself, watch the video. before work starts - this will help to avoid common mistakes, for example, incorrect position of the belt on the pulleys.

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Before installing a new belt, clean the pulleys from dirt and old rubber using a wire brush. This will prevent slipping and whistling.

FAQ: Frequently asked questions about the drive belt Nissan Terrano

🔧 Which belt is suitable for Terrano with QR25DE engine and air conditioning?

For Nissan Terrano with engine QR25DE and the air conditioner needs a belt 6PK1800 (original article - 11920-9J000). Analogues from Gates (6PK1800) or Contitech (6PK1800). Make sure the belt is 6 streams (not 4 or 5).

⚠️ Is it possible to drive with a whistling belt?

Short-term - yes, but it is fraught with consequences:

  • Whistling indicates slippage, due to which the battery is not charged.
  • If the belt is heavily worn, it may tear, which will lead to the stop of the generator and pump (engine overheating).
  • On diesel Terrano A whistling sound often means that the belt is about to break due to high load.

It is recommended to replace the belt and check the tension roller within 1–2 weeks after the whistle appears.

🔄 How often do you need to change the drive belt?

The manufacturer does not establish strict regulations, but the experience of the owners Terrano shows:

  • For gasoline engines (MR20DE/QR25DE) — every 60–80 thousand km.
  • For diesel (YD25DDTi) — every 40–50 thousand km (due to high loads).
  • If cracks or whistling appear - immediate replacement, regardless of mileage.

Also, the belt should be replaced when replacing the tension roller or generator/pump repair.

🛠️ Do I need to change the tension roller along with the belt?

Not required, but recommended:

  • The roller wears out at the same time as the belt - its bearing may jam.
  • The cost of the roller (~1,500 rubles) is not comparable with the risk of belt breakage due to a jammed roller.
  • On Terrano with a mileage of >100 thousand km, it is better to change the roller with belt.

The original article number of the roller for MR20DE — 11950-4M500.

🔍 How to check the condition of the belt without removing it?

A visual inspection can be carried out without removing the belt:

  1. Open the hood and find the belt (on the right in the direction of travel).
  2. Check tension - press the belt between the pulleys: the deflection should be 8–10 mm.
  3. Inspect at cracks, delamination or shiny areas (sign of wear).
  4. Check pulleys for play (shake them with your hand).

If the belt dirty or oily, it needs to be replaced - dirt accelerates wear.