Engine MR20DE - one of the most popular engines Nissan, installed on such popular models as Qashqai J10/J11, X-Trail T31/T32, Juke, Sentra and even Rogue for the American market. Despite its reliability, its gas distribution mechanism (GRM) requires special attention during maintenance. Errors in setting timing marks can lead to collision of pistons with valves, which is fraught with major repairs. This article will help you understand the nuances: from the location of the marks to typical mistakes when replacing a belt or chain.

Feature MR20DE - use timing chains instead of a belt (on most modifications), which many mistakenly consider to be an “eternal” solution. However, the chain stretches, and its tensioners and dampers wear out. When replacing a chain or belt (on some versions), it is critical precise alignment of marks on the crankshaft, camshafts and flywheel. Even a minimal displacement of 1-2 teeth can cause P0340 (camshaft position sensor error) or cause loss of power.

Timing design MR20DE: chain vs belt

Engines MR20DE were produced in two timing drive variants:

  • 🔗 Chain drive (most versions after 2010) - installed on Qashqai J11, X-Trail T32 And Rogue. The service life of the chain is stated at 200-250 thousand km, but in practice, stretching begins after 150 thousand km.
  • 🔄 Belt drive (early versions, e.g. Qashqai J10 until 2010) - the belt requires replacement every 90-100 thousand km, but the procedure is cheaper and simpler.

The key difference between the chain version is the presence phase shifter on the intake camshaft (VVT), which is controlled by a solenoid. When replacing a chain, it is necessary fix the phase shifter in its original position, otherwise the marks will match, but the engine will operate unstable. There is no phase shifter on belt versions, which simplifies the procedure.

📊 What type of timing drive does your MR20DE have?
  • Chain
  • Belt
  • I don't know
  • Other engine

Important: on chain motors MR20DE used double row chain with a pitch of 8 mm, and the tensioner has a hydraulic damper. When replacing the chain, be sure to update all sedatives (there are 3 of them) and tensioner - saving on these parts leads to accelerated wear.

Location of timing marks on MR20DE: diagrams and photos

Tags on MR20DE applied to:

  1. 🔧 Crankshaft pulley — the mark in the form of a dot or marks must coincide with the ebb on the cylinder block (to the right in the direction of travel).
  2. 🔄 Camshaft sprockets — on each star there is a mark in the form of a letter E (inlet) and I (release), which should look at each other.
  3. 🔍 Flywheel — the mark on the flywheel (visible through the inspection window in the clutch housing) must coincide with the triangular cutout on the casing.

On chain motors, the position is additionally checked phase shifter — its mark (small dot) should be directed upward. If the phase shifter has turned, it must be fixed with a special tool (for example, Nissan SST KV10118000).

element Label Position Photo/diagram
Crankshaft Point on the pulley Opposite low tide on the block 📷 (see illustration 1)
Intake camshaft Letter "E" Looks at the letter "I" of the exhaust shaft 📷 (see illustration 2)
Flywheel Risk Matches the triangle on the casing 📷 (see illustration 3)
Phase shifter (VVT) point In the upper position 📷 (see illustration 4)

⚠️ Attention: On engines with a chain, the marks on the camshaft sprockets may be faintly visible due to carbon deposits. Clean them with a wire brush or solvent before installation. Also check that the chain did not jump on the teeth - This is a common mistake when the tension is incorrect.

Step-by-step instructions for installing timing marks

The procedure is different for chain and belt versions, but the general algorithm is:

Remove the right wheel and wheel arch liner|Disconnect the battery|Drain the antifreeze (when replacing the pump)|Secure the flywheel through the inspection window|Prepare new parts (chain/belt, tensioners, dampers)-->

Step 1. Fixing the crankshaft.

Turn the crankshaft clockwise (by the pulley bolt) until the mark on the flywheel aligns with the triangle on the casing. Use the head on 22 mm and a collar. If the mark is not visible, remove the plug on the clutch housing (3 bolts under 10 mm).

Step 2: Checking the camshafts.

Remove the valve cover and make sure the marks are E And I on the stars look at each other. If not, rotate the crankshaft 360° (2 turns) and repeat the test. On chain motors, additionally fix the phase shifter.

Step 3: Install the new chain/belt.

On chain engines, the lower chain is installed first (from the crankshaft to the intermediate shaft), then the upper chain (to the camshafts). The chain tensioner is activated after installation - to do this, you need to turn the crankshaft 2 turns and tighten the tensioner bolt to a torque 20 Nm.

⚠️ Attention: When installing a timing belt on earlier versions MR20DE Do not reuse the tension roller - its spring loses its elasticity. Also check the condition of the pump: if the bearing play is more 0.5 mm, it needs to be replaced.

💡

Before installing the chain, lubricate it with engine oil - this will reduce noise during the first start and speed up break-in.

Typical mistakes and their consequences

Even experienced craftsmen make mistakes when working with timing belts. MR20DE. Here are the most common:

  • 🔄 Mismatch of marks by 1 tooth - leads to an error P0340 (camshaft sensor) and unstable idle speed. The engine may stall when releasing gas.
  • 🔧 Non-fixed phase shifter - the chain will not be tensioned correctly, which will cause knocking when cold and loss of power above 3000 rpm.
  • 🚗 Ignoring the replacement of sedatives — after 20-30 thousand km the chain will begin to “eat up” the plastic elements, which will lead to its breakage.
  • ⚡ Untested tensioner - if it is not replaced, the chain will sag after 50 thousand km, and the marks will get lost.

The most dangerous consequence is collision of valves with pistons. On MR20DE this occurs when the marks are displaced by more than 3 teeth. Symptoms:

  • 💥 Metallic knock when cranking with the starter.
  • 🔥 No compression in the cylinders (checked with a compression gauge).
  • 🚨 Check Engine light on with errors P0300 (misfire) and P0341 (timing phases).
What to do if the tags are lost after replacement?

If after assembly the engine does not start or runs unstable:

1. Remove the timing cover and check the timing marks again.

2. Turn the crankshaft by hand 2 turns - the marks should match in both positions.

3. Check the chain/belt tension - deflection of more than 5 mm is unacceptable.

4. If the error persists, reset the throttle and timing adaptations via the diagnostic scanner (for example, Launch X431 or Delphi).

Tools for working with timing belt MR20DE

To replace a chain or belt you will need:

Tool Purpose Alternative
Flywheel retainer Nissan SST KV10115000 Blocks the flywheel when the pulley bolt is unscrewed Homemade retainer made from a metal rod
Phase shifter lock Nissan SST KV10118000 Holds VVT in original position Flat blade screwdriver (risk of damage)
Head set 10-22 mm For unscrewing covers and pulleys Impact socket for stuck bolts
Torque wrench Tightening the crankshaft pulley bolt (100 Nm + 30°) Without a dynamometer there is a risk of thread stripping

⚠️ Attention: In the absence of original fasteners Nissan Do not use improvised means to block the phase shifter - this may damage its mechanism. It’s better to rent a tool or contact a service center.

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The most common cause of an open circuit on the MR20DE is failure to replace the dampers. Their wear accelerates chain stretching by 2-3 times.

When to change timing chain/belt on MR20DE?

Recommendations for replacement timing:

  • 🔄 Timing belt - every 90-100 thousand km or 6 years (even if the mileage is small, the tires age).
  • 🔗 Timing chain — official regulations 200 thousand km, but in practice:
    • During city use (frequent starts) - 150-180 thousand km.
    • During aggressive driving or overheating - 120-150 thousand km.
  • ⚠️ Emergency replacement required when:
    • Chain knocking when cold (especially the first 5 seconds after starting).
    • Jerks during acceleration and error P0011 (VVT phase shift).
    • Visual stretching of the chain (sagging more than 10 mm when pressed).

To check the condition of the circuit without disassembly, you can use endoscope through the oil filler neck. If the camshaft sprockets show severe tooth wear or chips, the chain must be replaced.

Cost of work and parts

Prices are valid for 2026 (Moscow and regions):

Part/Job Price (RUB) Notes
Timing chain kit (chains, sprockets, stabilizers, tensioner) 12 000 — 18 000 Original Nissan 13028-4M51A or Febi, Gates
Timing belt kit (belt, rollers, pump) 8 000 — 12 000 Recommended Gates K015631XS or Contitech CT1035K1
Replacing the timing chain (work) 15 000 — 25 000 Includes replacement of seals and flushing of the system
Replacing the timing belt (work) 6 000 — 10 000 They often offer a discount when purchasing a kit from a specialist

There is no need to skimp on parts - non-original chains (for example, Chinese NoName) stretch 2 times faster. Also note crankshaft and camshaft seals — replacing them will add ~3,000 rubles, but will save time in the future.

FAQ: Frequently asked questions about MR20DE timing marks

Is it possible to set marks without latches?

Theoretically yes, but the risk of phase shifter displacement is very high. Without lock KV10118000 The chain may turn when tensioned, which will lead to misalignment of the marks on the camshafts. If there is no lock, at least block the flywheel and check the marks 3 times before starting.

What happens if the chain jumps 1 tooth?

When shifted by 1 tooth, the engine will run, but an error will appear P0340 or P0011, and also:

  • Floating idle speed.
  • Power loss is higher 4000 rpm.
  • Increased fuel consumption (up to 1-2 l/100 km).

Driving for a long time in this mode will cause wear on the valves and seats.

How to check chain tension without removing the cover?

Remove the oil filler cap and shine a flashlight on the camshaft sprockets. If the chain sags by more than 5-7 mm when pressed with a screwdriver, it needs to be tightened or replaced. Also pay attention to noises:

  • 🔊 Knock on startup - stretched chain.
  • 🔊 Rustling at idle - worn out dampers.
  • 🔊 Metal clang — critical sagging (urgent repairs are needed).
Do I need to change the oil after replacing the chain?

Definitely! When replacing a chain, metal shavings from worn sprockets enter the engine. Fill with new oil with filter (recommended 5W-30 or 5W-40 by Nissan specifications) and reduce the first replacement interval to 5,000 km.

Is it possible to drive with broken tags?

Short-term (before service) - yes, but only if the engine starts and there are no knocks. Driving for a long time with broken marks leads to:

  • 🔥 Overheating (due to incorrect valve timing).
  • 💥 Shock load on valves and pistons.
  • 🚗 Loss of compression and oil starvation.

If the marks are severely knocked down (more than 3 teeth), the engine may stall and not start.