Valve adjustment on Nissan Terrano: when it is needed, how to do it correctly and not break the engine

Adjusting the valves Nissan Terrano - a procedure that many owners put off until the last minute, until the engine begins to “knock” or “trouble.” Meanwhile, incorrect valve clearances lead to loss of power, increased fuel consumption and even burnout of saddles or the plates themselves. In this article we will look at when adjustment is really required, what clearances are relevant for different engines Terrano (including R20, R50 and restyled versions), and how to do the work yourself - with photos, diagrams and unique life hacks from service station masters.

Let us warn you right away: if you have never held a dipstick in your hands or do not know where the camshaft is, it is better to entrust the matter to professionals. But if you’re willing to take a risk, our guide will help you save 5–8 thousand rubles (that’s how much the services charge for adjustments). The main thing is to take your time and follow step by step instructions taking into account the nuances of your specific engine Terrano.

When valve adjustment is needed: 5 obvious and 2 hidden signs

The manufacturer recommends checking valve clearances to Nissan Terrano every 90–100 thousand km, but the actual interval depends on operating conditions. For example, when driving on gas or frequent off-road trips, adjustment may be required after 60 thousand km. The following symptoms will help determine the need for the procedure:

• 🔊 Knocking or knocking in the upper part of the engine when cold (disappears after warming up - a classic sign of increased clearances).
• 🚗 Power drop and “dullness” of the engine during acceleration, especially at low speeds.
• 💨 Increased fuel consumption (by 10–15%) for no apparent reason.
• 🔥 Engine troubles or is unstable at idle speed.
• 🛑 Errors P0300–P0304 (misfire) on the dashboard.

But there are also less obvious signs that are often ignored:

1. Difficult start in the morning after parking overnight (even with a good battery).
2. Vibrations on the steering wheel or body during engine operation, which are not associated with wheel imbalance.

If you notice at least 2-3 symptoms from the list, do not delay diagnosis. Valve clearances at Terrano with engines KR15DE And HR16DE tend to decrease over time (due to wear on the camshaft cams), and MR20DE - on the contrary, increase.

What valve clearances should be on a Nissan Terrano: table for all engines

Nominal valve clearances for Nissan Terrano depend on the engine model and year of manufacture. Below is a current table for the most common motors. Attention: Data may vary for cars manufactured before 2014 (before restyling).

Engine	Years of manufacture	Intake valves (mm)	Exhaust valves (mm)	Notes
KR15DE (1.5 l)	2014–2020	0.20–0.26	0.28–0.34	The clearances are checked on a cold engine (20°C).
HR16DE (1.6 l)	2014–2023	0.24–0.30	0.32–0.38	On versions with HBO, the gaps increase by 0.02 mm.
MR20DE (2.0 l)	2016–2023	0.22–0.28	0.30–0.36	Requires adjustment less often - every 120 thousand km.
K9K (1.5 dCi, diesel)	2015–2020	0.15–0.20	0.25–0.30	Adjustment only at a service station (special tools required).

Important: clearances are indicated for cold engine (temperature not higher than 25°C). If the adjustment is carried out on a hot motor, the values ​​​​must be adjusted taking into account thermal expansion (usually add 0.02–0.03 mm).

⚠️ Attention: On Nissan Terrano with engine HR16DE after 2018 production installed by the factory hydraulic compensators on the intake valves. They do not require adjustment, but if a knocking noise appears, this is a sign of wear or oil starvation.

Tools for adjusting valves: what to buy and where not to save

For self-adjustment of valves on Terrano you will need a specialized tool. Do not try to make do with “improvised means” - this can lead to thread breakage or damage to the camshaft. Here's the full list:

Set of feeler gauges (0.05-1.00 mm) in 0.01 mm increments|10, 12, 13 mm socket wrenches|Flat head screwdriver (to secure the pushrods)|Micrometer or caliper (to measure the pushrods)|Special valve spring puller (optional)|New valve cover gaskets and camshafts|Torque wrench (for tightening with a force of 10–12 Nm)|Carburetor cleaner or kerosene (for washing parts)-->

Where you shouldn't save:

• 🔧 Probes — take a set from Mitutoyo or Jonnesway (Chinese ones often lie by 0.02–0.03 mm).
• 🔩 Torque wrench — without it, you risk overtightening the valve cover bolts, which leads to oil leakage.
• 🛢️ Gaskets - original from Nissan (article 13270-4M00A for the lid, 13070-4M000 for camshafts) last longer than analogues.

If you plan to adjust the valves by replacing pushers (and not selecting washers), you will additionally need:

• 📦 Set of adjusting washers (item no. 13085-4M000 for HR16DE).
• 🔨 A device for removing pushers (you can make it yourself from an old screwdriver).

Step-by-step instructions: how to adjust valves on a Nissan Terrano

The adjustment process is the same for most gasoline engines Terrano, but there are nuances for KR15DE And MR20DE. Let's consider a universal algorithm using an example HR16DE (1.6 l).

Step 1: Preparation and dismantling

1. Remove negative terminal from the battery.
2. Dismantle air filter and pipes.
3. Disconnect the throttle cable and camshaft sensor connectors.
4. Remove valve cover (8 10mm wrench bolts).
5. Install the piston of the 1st cylinder in TDC (top dead center) of the compression stroke. To do this:
   • Remove the spark plug for cylinder 1.
   • Rotate the crankshaft clockwise (with a 22 mm wrench) until the marks on the pulley and the block match.
   • Check that the camshaft cams of the 1st cylinder are pointing upward.

Step 2: Measuring the gaps

Use a feeler gauge to check the gap between camshaft cam And pusher. The probe should enter with a slight force, but not “bite”. Record the results for each valve (16 in total: 4 per cylinder).

Example entry:

Цилиндр 1:
- Впуск 1: 0.22 мм (норма)
- Впуск 2: 0.30 мм (превышение на 0.04 мм)
- Выпуск 1: 0.35 мм (норма)
- Выпуск 2: 0.40 мм (превышение на 0.06 мм)

Step 3: Adjustment

If the gaps are outside the norm, there are two options:

1. Selection of washers (for motors with pushers). Formula for calculating the thickness of a new washer:

   H_new = H_old + (A_measured - A_nominal)

   where:

   • H_old - thickness of the old washer (written on it).
   • A_measured - measured gap.
   • A_nominal - nominal clearance.

Replacing pushers (for engines with hydraulic compensators - only replacement of defects).

To replace washers:

1. Press the pusher in with a special tool or a screwdriver.
2. Secure it in the down position (you can use a wire).
3. Remove the old washer with tweezers and install the new one.

Step 4: Assembly and Testing

After adjusting all valves:

1. Rotate the crankshaft 2 turns and re-measure the clearances (they may change).
2. Install a new valve cover gasket (the old one cannot be used!).
3. Tighten the cover bolts with a torque wrench to 10 Nm.
4. Connect all connectors and pipes, install the air filter.

Typical mistakes when adjusting valves on Terrano and how to avoid them

Even experienced craftsmen sometimes make mistakes that lead to re-disassembly or worse - cylinder head repair. Here are the most common:

• 🔧 Incorrect adjustment order. The valves must be adjusted in a strict sequence corresponding to the order of operation of the cylinders (1-3-4-2 for HR16DE). If you disturb the order, the gaps will “go away” after the first start.
• 🌡️ Adjustment on a hot engine. Metal expands when heated, so clearances set “hot” will be too high on a cold engine.
• 🛠️ Using old gaskets. Rubber valve cover and camshaft gaskets become deformed when removed. Their repeated use leads to oil leakage.
• 📏 Inaccurate measurements. The probe should enter with slight effort. If it “flies” or does not enter at all, the gap is incorrect.

⚠️ Attention: On Nissan Terrano with engine MR20DE (2.0 l) after 2019 installed phase shifters on the camshafts. When adjusting valves, do not rotate the shafts by the pulleys - only by the crankshaft! Otherwise, the phase shifters fail.

Another common mistake is incorrect tightening of bolts. Valve cover bolts are tightened from the center to the edges crosswise, not in a circle. The force is strictly 10 Nm (tightening leads to deformation of the cover).

What happens if the valves are adjusted incorrectly?

Reduced clearances lead to incomplete closure of valves, which causes loss of compression, burning out of cymbals and seats. Increased gaps lead to shock load on the camshaft, accelerated wear of the cams and knocking. In both cases, the engine life is reduced by 20–30%.

Valve adjustment on Terrano with LPG: nuances and adjustments

If your Nissan Terrano equipped gas equipment (GBO 4th generation and higher), valve clearances need to be increased by 0.02–0.05 mm from nominal. This is due to the higher combustion temperature of gas compared to gasoline.

Recommended clearances for Terrano with HBO:

• KR15DE: inlet - 0.22–0.28 mm, release - 0.30–0.36 mm.
• HR16DE: inlet - 0.26–0.32 mm, release - 0.34–0.40 mm.
• MR20DE: inlet - 0.24–0.30 mm, release - 0.32–0.38 mm.

Additional recommendations for HBO:

• 🔥 Check the gaps more often — every 50–60 thousand km (gas accelerates wear of the seats).
• 🛢️ Use high ash oil (For example, Liqui Moly Top Tec 4200 5W-30), since gas burns the oil film more actively than gasoline.
• 🔧 After adjustment, be sure to check ignition timing — on gas it should be 2–3° earlier than on gasoline.

⚠️ Attention: On Nissan Terrano absolutely cannot be used with HBO metal valve cover gaskets. Due to vibrations from running on gas, they quickly become deformed, which leads to oil leakage into the spark plug wells.

Is it worth adjusting the valves yourself or is it better to go to a service station?

Adjusting the valves Terrano - a task of medium complexity that requires precision, patience and the right tools. Let's evaluate the pros and cons of the do-it-yourself approach:

Criterion	On your own	At the service station
Cost	1,500–3,000 ₽ (gaskets + probes)	5,000–8,000 ₽ (depending on the region)
Time	4–6 hours (for a beginner)	1.5–2 hours
Quality	Depends on experience (risk of errors)	Labor warranty (usually 1–3 months)
Nuances	You can study the engine design	Masters know the features of a particular motor

It makes sense to carry out independent adjustment if:

• 🔧 You already have experience in car repair (for example, changing the timing belt).
• 🛠️ There is a full set of tools (especially a torque wrench).
• 📚 You have carefully studied service manual for your model Terrano.

In other cases, it is better to contact a service station. Especially when it comes to:

• 🚗 Nissan Terrano with engine MR20DE (complex design of phase shifters).
• 🔥 Cars with HBO (adjustment of gaps and checking the ignition are required).
• ⚠️ Cars with a mileage of more than 200 thousand km (risk of “fatigue” of the cylinder head metal).

Frequently asked questions about valve adjustment on Nissan Terrano

Is it possible to drive with knocking valves if the car does not pull?

No. Valve knocking is a sign of increased clearances, which leads to shock loads on the camshaft and accelerated wear. If you ignore the problem, after 10–15 thousand km you may need to replace the camshaft or even cylinder head overhaul.

How much does it cost to adjust valves on a Terrano at a service center?

The cost depends on the region and type of service station:

• Official dealer: 7,000–10,000 ₽ (plus diagnostics).
• Unofficial service: 4,000–6,000 rubles.
• Garage technicians: RUB 3,000–4,500 (but no guarantee).

The price usually includes gasket replacement, but not always - check in advance.

How to check if the valves are adjusted correctly after work?

After adjustment:

1. Start the engine and listen to it idle - there should be no knocking noise.
2. Check compression in all cylinders (should be 12–13 bar, spread no more than 1 bar).
3. Test the car in motion - the “dullness” during acceleration should disappear.
4. After 500 km, re-check the gaps (they may “shrink”).

What to do if after adjustment the engine starts to run worse?

Probable reasons:

• Incorrectly displayed valve timing (check the labels).
• The procedure for adjusting the valves is mixed up (the procedure must be repeated).
• Debris getting into oil channels (washing required).
• Malfunction camshaft sensors (check errors with a scanner).

If you are not confident in your abilities, take the car for diagnostics.

Is it possible to adjust the valves without removing the camshafts?

Yes, but only if the gaps are adjusted selection of washers (for motors with pushers). On engines with hydraulic compensators (HR16DE after 2018) adjustment without removing camshafts impossible — Compensators need to be replaced.