K24Z6 Engine

Honda K24Z6 2.4 i-VTEC: Japanese “Big Block” – Ownership Impressions, Issues, Fuel Consumption and Buying Used

Key points (TL;DR)

• Reliability: Extremely high. This is one of the most durable petrol engines of the modern era.
• Biggest downside: The VTC actuator (cam phaser) which produces an unpleasant noise on cold start.
• Fuel consumption: High in city driving. This is not a small city engine, but a large-displacement unit.
• Maintenance: Requires regular (mechanical) valve adjustment, but has no expensive failures like turbochargers or DPFs.
• LPG (Autogas): An ideal candidate for LPG conversion, which significantly reduces running costs.
• Recommendation: If you don’t mind higher fuel consumption and registration costs, this is by far a better long‑term ownership choice than a diesel.

Contents

• Introduction and Models
• Technical Specifications
• Reliability and Maintenance
• Specific Parts and Costs
• Fuel Consumption and Performance
• Additional Options and Modifications
• Gearbox
• Buying Used and Conclusion

Introduction

The K24Z6 engine belongs to Honda’s legendary K-series, which has achieved cult status among car enthusiasts thanks to its fantastic engineering. Specifically, the Z6 variant is an evolution of the 2.4‑liter unit adapted for SUV use, primarily for the third‑generation Honda CR‑V (facelift models from 2009 to 2011). While Europe mostly got 2.0 petrols (R20) or 2.2 diesels (i‑DTEC/i‑CTDi), this 2.4 engine was standard on the US market, but was also installed in models for Eastern Europe and other specific markets.

This is an engine for drivers who want power without the complications that come with turbochargers. Its displacement gives it enough breathing room to cope with the weight of the CR‑V, and the i‑VTEC technology provides that recognizable high‑revving Honda character.

Technical specifications

Parameter	Data
Engine code	K24Z6
Displacement	2354 cc (2.4 L)
Power	132 kW (180 hp) @ 6800 rpm
Torque	218 Nm @ 4400 rpm
Fuel type	Petrol (Gasoline)
Aspiration	Naturally aspirated
Injection system	MPI (Multi‑Point Injection) – Indirect
Camshaft drive	Timing chain
Emissions standard	Euro 5 (Depending on market)

Reliability and Maintenance

Does this engine have a timing belt or a chain?

The K24Z6 uses a timing chain. Honda chains are generally very high quality and designed to last the lifetime of the engine. However, that “lifetime” heavily depends on regular oil changes. If the oil is changed on time, the chain can easily go over 250,000–300,000 km without stretching. Symptoms of a stretched chain are a “Check Engine” light (cam/crank correlation error) and metallic rattling.

What are the most common issues with this engine?

Although the engine is extremely reliable, there are a few specific points to pay attention to:

• VTC actuator (Variable cam timing gear): This is by far the most common issue on K‑series engines. It manifests as a loud, metallic “grinding” noise lasting 1–2 seconds only on cold start. The problem lies in the locking mechanism of the gear, which doesn’t retain oil, so on startup the gear “knocks” until oil pressure builds up. Although it sounds scary, it often doesn’t cause catastrophic failure right away, but it should be replaced.
• Oil leak at the VTEC valve: The gasket of the VTEC solenoid (behind the cylinder head) often fails, so the engine “sweats” oil down the back of the block. The repair is cheap (market‑dependent); you just replace the rubber gasket/screen.
• Front crankshaft seal: May start leaking at higher mileage.

At what mileage is the “major service” due?

Since the engine has a chain, the classic “major service” (belt replacement) doesn’t exist in that form. However, the auxiliary (serpentine) belt that drives the alternator, A/C and water pump should be replaced at around 100,000–120,000 km, together with the tensioner and idler pulleys. The water pump is replaced only if it shows signs of leakage or play; it is not tied to the timing system.

How many liters of oil does this engine take and which viscosity is recommended?

The sump holds approximately 4.2 to 4.4 liters of oil with filter. For this engine (especially in markets with colder winters) Honda strictly recommends 0W‑20 for best cold‑start protection and fuel economy. However, in regions with very hot summers or for higher‑mileage engines, 5W‑30 is perfectly acceptable and often a better option. The important thing is to use high‑quality, fully synthetic oil.

Does it consume oil between services and what is considered normal?

Honda VTEC engines are known to “drink” a bit of oil, especially if they are often driven at high rpm (in the VTEC zone). Consumption of up to 0.5 to 0.8 liters per 10,000 km is completely normal and nothing to worry about. If consumption exceeds 1 liter per 2,000–3,000 km, this may indicate stuck oil control rings, which is rarer on the Z6 version than on older models, but possible with poor maintenance.

At what mileage should the spark plugs be replaced?

This engine uses iridium spark plugs (NGK or Denso). Their replacement interval is long, usually around 100,000 to 120,000 km. Don’t experiment with regular copper plugs; use only those specified by the manufacturer, as they directly affect the operation of the ignition coils.

Specific Parts (Costs)

Does this engine have a dual‑mass flywheel?

Since this engine is paired with a conventional automatic transmission (torque converter) in 99% of Honda CR‑Vs, it DOES NOT have a dual‑mass flywheel. Instead, it has a torque converter, which is part of the gearbox and is very durable. This is a major saving compared to diesel versions with manual gearboxes.

What kind of injection system does it have and are the injectors problematic?

The K24Z6 uses a classic MPI (Multi‑Point Injection) system into the intake manifold. This is “old‑school” injection which is extremely reliable. Injectors almost never cause problems, are not as sensitive to fuel quality as on direct‑injection (GDI) engines, and are cheap to clean or replace (not expensive – market‑dependent).

Does this engine have a turbocharger?

No. This is a naturally aspirated engine. There is no turbocharger, no intercooler, no high‑pressure hoses that can burst. That means one (expensive) worry less for the owner. It makes power through displacement and variable valve timing.

Does this model have a DPF, EGR valve or AdBlue?

As a petrol engine from that generation:

• DPF (FAP): None.
• AdBlue: None.
• EGR valve: It does have an EGR system for exhaust gas recirculation. On petrol engines it clogs much more slowly than on diesels because there is less soot. EGR issues are rare and usually solved by cleaning, not replacement.

Fuel Consumption and Performance

What is the real‑world fuel consumption in city driving?

Let’s be honest – this is a 2.4‑liter engine in a heavy SUV with all‑wheel drive and an automatic gearbox. In pure city driving (stop‑and‑go), consumption ranges from 11 to 14 liters per 100 km. In winter or on very short trips it can go up to 15 liters. If you are looking for city fuel economy, this is not the engine for you (unless you install LPG).

Is this engine “lazy” for the weight of the car it’s in?

With 180 hp and 218 Nm, the engine is not “lazy”, but it does require a different driving style. Since it has no turbo, at low revs (below 3000 rpm) it feels tame and sometimes sluggish under sudden acceleration. However, when you press the throttle, the gearbox kicks down and the engine enters the VTEC zone (above 4500 rpm), it becomes very lively and potent. For normal driving it is more than adequate, and for overtaking it simply requires a kick‑down.

What is it like on the motorway and at what rpm does it cruise at 130 km/h?

On open roads this engine is in its element. It is very quiet and refined. With the 5‑speed automatic, at 130 km/h it spins at about 2,500 to 2,700 rpm (depending on final drive ratio for the specific market), which is comfortable for your ears. Motorway consumption is around 8.5 to 9.5 liters, which is acceptable.

Additional Options and Modifications

Is this engine suitable for LPG (autogas) conversion?

Yes, absolutely. Thanks to its indirect injection, the K24Z6 is ideal for LPG conversion. The system is simple, cheaper to install than on direct‑injection engines, and works perfectly.
IMPORTANT NOTE: Honda engines on LPG require more frequent valve clearance checks! It is recommended to check them every 30,000–40,000 km if you run LPG, to prevent the valves from “sinking” into the valve seats. Be sure to install a valve lubrication system (valve saver) or software‑controlled petrol injection at high rpm.

How much can this engine be safely “chipped” (Stage 1)?

On naturally aspirated petrol engines, “chiptuning” (remapping) brings very small gains. You can expect an increase of about 5 to 8 hp and a slightly better throttle response. In practice, you’ll barely feel it. The real potential of this engine is unlocked only with serious mechanical modifications (intake, exhaust, different camshaft), which is an expensive hobby. For the average driver, Stage 1 is a waste of money.

Gearbox

Which manual and automatic gearboxes are paired with this engine?

With the 180 hp K24Z6 in the CR‑V, you almost exclusively get Honda’s 5‑speed conventional automatic gearbox. Manual gearboxes were reserved for the weaker 2.0 petrols or diesel units on the European market.

What are the most common failures of the automatic gearbox?

Honda’s 5‑speed automatic is extremely robust and reliable. It has no characteristic failures if maintained properly. Rare issues show up as jerks when shifting from 1st to 2nd gear, which usually indicates old oil or dirty solenoids.

At what mileage should the gearbox be serviced and the oil changed?

This is a key point. Honda gearboxes are sensitive to oil quality. The oil should be changed every 40,000 to 60,000 km (or every 4 years).
IMPORTANT: Use only genuine Honda ATF‑DW1 (or the older ATF‑Z1). Never use “universal” fluids. Also, Honda gearboxes should NOT be flushed by machine under pressure, as this can damage the internal, non‑serviceable filter. Only the “drain & fill” method is used – you drain about 3 liters and refill the same amount of new fluid.

Buying Used and Conclusion

When buying a used car with the K24Z6 engine, do the following:

1. Cold start: Insist that the engine be completely cold. Listen for the first 2 seconds. If you hear a loud metallic “krrrr”, the VTC actuator needs replacement (Repair cost: medium – market‑dependent).
2. Check the oil: Pull out the dipstick. If the oil is at minimum or below, the owner hasn’t been monitoring oil consumption, which is a red flag for the timing chain.
3. Idle: The engine should idle smoothly. Vibrations may indicate the need for valve adjustment or worn engine mounts.

Conclusion:
The Honda CR‑V with the K24Z6 engine is one of the most reliable used SUVs you can buy. If you accept the higher fuel consumption (which can be solved with LPG) and the more expensive registration due to displacement, you’ll get a car that won’t leave you stranded. Maintenance is predictable, there are no expensive traps like on diesels, and the comfort of an automatic combined with a large petrol engine provides a truly “American‑style” driving pleasure adapted to European roads.