Timing marks K4M 16 valves on Nissan Almera: step-by-step guide with photos and diagrams

Engine K4M with 16 valves, mounted on Nissan Almera (including models N16, G15 and restyled versions), is famous for its reliability, but requires precise maintenance. One of the critical operations is correct installation timing marks. An error of even one gear tooth can lead to a collision of pistons with valves, which can lead to major repairs.

In this article we will look not only where are the timing marks on the K4M 16V, but also how to set them without a specialized tool, what mistakes beginners make, and what to do if the marks “gone” after a belt break. The material is based on manuals Renault-Nissan, car service experience and owner reviews Almera Classic And Almera G15 with motors K4M 710/742/832.

K4M 16V timing belt design: why timing marks are so important

Engine K4M belongs to the series K-Type from the alliance Renault-Nissan and is equipped with a variable valve timing system on the intake shaft (VVT). This means that the synchronization of the camshafts and crankshaft must be perfect - the slightest shift will lead to:

• 🔧 Loss of power (up to 30%) due to untimely opening/closing of valves.
• 💥 Impact of pistons on valves when displaced by more than 2 teeth (risk - 100% if the belt breaks).
• ⚠️ Increased fuel consumption and detonation due to incorrect angular position of the shaft.

On K4M 16V marks are applied to:

• 🔄 Crankshaft gear (front, under the pulley).
• 🔄 Camshaft gears (inlet and outlet).
• 🔧 Oil pump housing and the rear timing cover (stationary marks).

Feature K4M — absence of a key on the crankshaft gear. Instead it is used press fit, which complicates visual inspection of the marks without removing the pulley. This is one of the reasons why many owners Almera make mistakes when replacing the belt yourself.

Where to look for timing marks on K4M 16 valves: photos and diagrams

On the engine K4M the marks are located in three zones. Their visualization depends on whether upper timing case and crankshaft pulley. Below are diagrams for each shaft with explanations.

1. Crankshaft mark (most hidden)

Located on crankshaft toothed pulley under a plastic casing. To access you need:

1. Remove the right front wheel and fender liner.
2. Remove the alternator belt and tension roller.
3. Unscrew the crankshaft pulley bolt (you will need a clamp or the help of a second person).

The label represents point or small mark, which must coincide with recess on the oil pump housing (see photo below). On some versions K4M (For example, K4M 832) the mark is made in the form V-neck.

Photo of the K4M crankshaft mark

On the crankshaft pulley, the mark looks like a small notch (1–2 mm) located between the teeth. On the oil pump housing, this is a small indentation or the letter "T" (on newer models).

2. Camshaft marks (intake and exhaust)

Located on camshaft gears and must match the marks on rear timing cover. Features:

• 🔹 Intake shaft: mark - a dot or mark, coincides with the cutout on the cover (usually indicated by the letter I or IN).
• 🔹 Exhaust shaft: mark - cutout or triangle, coincides with the cutout E or EX.

On Nissan Almera G15 with K4M after 2013, labels can be made in the form colored dots (red - inlet, blue - outlet).

3. Additional marks (for verification)

The manufacturer has provided control marks on the flywheel, which are visible through the inspection window in the clutch housing (from the gearbox side). If the marks on the shafts coincide, the window should show flywheel mark, coinciding with the triangular cutout on the crankcase.

Val	Label type	Match with	Note
Crankshaft	Point/Risk	Recess on the oil pump housing	Requires pulley removal
Camshaft (intake)	Dot or letter I	Cutout on the rear timing cover	May be red
Camshaft (exhaust)	Triangle or letter E	Cutout on the rear timing cover	May be blue
Flywheel	Risk	Triangular cutout on crankcase	Visible through viewing window

Step-by-step instructions: how to set timing marks on a K4M 16V

The tagging procedure requires accuracy and consistency. Below is the algorithm for Nissan Almera with engine K4M, adapted for garage conditions (without specialized clamps).

Preparing tools

You will need:

• 🔧 A set of sockets and a ratchet wrench (especially the head on 18 mm for the crankshaft pulley bolt).
• 🔧 Screwdrivers (flat and Phillips) for removing casings.
• 🔧 Torque wrench (for tightening the pulley bolt with a torque 40–50 Nm).
• 🔧 Crankshaft retainer (can be made from an old timing belt or a metal rod).
• 🔧 Flashlight or lamp for illuminating marks.

Step 1: Dismantling interfering elements

1. Disconnect the battery (remove the negative terminal).
2. Remove the right front wheel and plastic fender liner.
3. Loosen the generator belt tensioner and remove the belt.
4. Unscrew the 3 bolts of the upper timing case and remove it.
5. Secure the crankshaft from turning (for example, by inserting a screwdriver into the flywheel teeth through the inspection window).
6. Unscrew the crankshaft pulley bolt (force or assistance of a second person will be required).

Step 2: Checking Label Matching

After removing the crankshaft pulley:

1. Turn the crankshaft clockwise (by the pulley bolt) until the mark on the crankshaft gear matches the mark on the oil pump housing.
2. Make sure the marks on the camshafts line up with the cutouts on the rear timing cover.
3. Check the position of the flywheel through the inspection window (the mark should be in the center of the cutout).

Step 3: Installing a New Timing Belt

If the marks match, you can start replacing the belt:

1. Loosen the tension roller and remove the old belt.
2. Install the new belt, starting with the crankshaft gear, then the camshafts (intake first, then exhaust).
3. Tension the belt with a roller (the degree of tension is checked by deflection 5–7 mm when pressing with a finger between the camshafts).
4. Rotate the crankshaft 2 full turns and recheck the alignment of the marks.

Typical mistakes when installing timing marks on a K4M

Even experienced craftsmen sometimes make mistakes that lead to loss of timing synchronization. Below are the most common mistakes and their consequences.

1. Rotated marks on camshafts

If, when installing the belt, at least one of the camshafts turns (for example, due to insufficient fixation), the marks will move apart. This will lead to:

• 🔧 Floating revolutions at idle speed.
• 💥 Knocking in the engine (with strong displacement).
• ⚠️ Check Engine light up (errors on phase sensors P0340, P0341).

⚠️ Attention: If after replacing the timing belt the engine does not start or runs intermittently, stop trying to start immediately! Turn the crankshaft by hand - if resistance is felt, the valves have already hit the pistons.

2. Incorrect belt tension

Weak tension leads to belt slippage and displacement of marks, and too much - to accelerated wear of roller bearings. Optimal tension for K4M:

• 🔧 Belt deflection between camshafts: 5–7 mm when pressed with force 10 kg.
• 🔧 The tension roller should spring, but not play.

3. Ignoring the flywheel mark

Many people forget to check the mark on the flywheel, relying only on the shaft marks. This is fraught 180° offset, since the crankshaft makes 2 revolutions per 1 revolution of the camshafts. Signs of an error:

• 🔧 The engine does not start, but the starter turns.
• 💥 Exhaust gases “shoot” into the exhaust manifold.

What to do if the labels don't match?

If after several attempts the labels do not match, check:

- Have the camshafts rotated relative to the gears (this happens when the bolts are loose).

- Are the teeth on the gears worn out (especially important for engines with mileage >200 thousand km).

- Is there any dirt between the teeth of the belt and gears (clean all surfaces).

What to do if the timing belt breaks on a K4M 16V

Broken timing belt K4M almost always leads to meeting of valves with pistons, since this engine is interference. However, there is a chance of “getting off with a slight fright” if:

• 🔧 The breakdown occurred at idle speed (minimal damage).
• 🔧 The pistons have recesses for the valves (on some versions K4M after 2010).

Sequence of actions in case of a break:

1. Stop the engine immediately (do not try to start it!).
2. Remove the timing case and assess the damage:
   • If the belt is intact, but has come off, set the marks and tighten the belt.
   • If the belt is torn, replacement + checking the valves is required.

Turn the crankshaft manually: if you feel jamming or knocking, valves are bent.

If damage is suspected, remove the cylinder head and check the valves (on K4M Intake ones break more often).

⚠️ Attention: On Nissan Almera with K4M after timing belt breaks in 90% of cases valves bend on 1–2 cylinders. The only way to avoid repairs is to regularly replace the belt (every 60–80 thousand km or 4–5 years).

Timing belt and roller replacement intervals on K4M

Manufacturer (Renault-Nissan) indicates the timing belt life for K4M in 120 thousand km, but in practice this period needs to be reduced:

Operating conditions	Recommended replacement interval	Note
Ideal (Europe, temperate climate)	80–100 thousand km	When using original spare parts
Urban cycle (frequent traffic jams)	60–70 thousand km	Increased load on the belt
Extreme (heat/cold, dust)	50–60 thousand km	Risk of belt cracking
Sports driving (high revs)	40–50 thousand km	Accelerated wear of rollers

Together with timing belt on K4M be sure to change:

• 🔧 Tension roller (resource - 1 replacement).
• 🔧 Idler roller (if any).
• 🔧 pump (every 120 thousand km, since its jamming leads to belt breakage).

Using non-original belts (for example, Gates, Contitech, Dayco) are acceptable, but only if they are certified for Renault-Nissan. Cheap analogues (for example, Phoenix, Belmag) often stretch or tear prematurely.

FAQ: Frequently asked questions about timing marks K4M 16V

Is it possible to set timing marks on a K4M without removing the crankshaft pulley?

Technically possible, but highly not recommended. Without removing the pulley, you will not see the mark on the crankshaft, which will lead to an error of 1-2 teeth. For accurate installation, the pulley must be removed, especially if the belt has already slipped or torn.

What happens if the timing marks on the K4M match, but the engine does not start?

There are several reasons:

1. Offset marks by flywheel (check through the viewing window).
2. Malfunction crankshaft position sensor (CPS) or camshaft (DPRV).
3. Bent valves after a belt breaks (disassembly required).
4. Error in belt installation sequences (for example, first put on the exhaust shaft, and then on the intake shaft).

Check first spark and compression. If they are not there, most likely the problem is in the valves.

Which timing belt is better to choose for Nissan Almera K4M?

Optimal options:

• Original: Renault 7701477025 or Nissan 130C1-7M600 (for Almera G15).
• Analogues:
  • Gates K015631XS (set with rollers).
  • Contitech CT1135K1.
  • Dayco KTB631.

Avoid belts without reinforcement (eg Belmag or Phoenix) - they stretch through 20–30 thousand km.

Do I need to lock the camshafts when replacing the timing belt on a K4M?

Yes, necessarily. Without fixation, the camshafts can rotate under the action of the valve springs, which will lead to displacement of the marks. For fixation you can use:

• Special fastener (for example, Renault Mot.1496).
• A homemade device made from a metal rod or an old timing belt.

Alternative - mark the position of the camshafts relative to the cylinder head marker before removing the belt.

What errors does the ECU produce when the timing marks are set incorrectly?

On Nissan Almera with K4M typical mistakes:

• P0340 — Malfunction of the camshaft position sensor (CPS) circuit.
• P0341 — Valve timing error (labels do not match).
• P0335 — Malfunction of the crankshaft position sensor (CPS).
• P0011 — Intake camshaft timing (for engines with VVT).

If after replacing the belt the Check Engine, check the marks first, and then reset the errors with the scanner (for example, ELM327).