Honda K24 Rebuild, common faults & everything you need to know
A complete guide to Honda's 2.4-litre i-VTEC - a chain-driven DOHC and the 2.4-litre long-stroke sibling of the K20. From VTC rattle to 500-horsepower turbo builds, with factory-verified torque specs and workshop prices.
We have built and rebuilt Honda's K-series for years. The K24 is the 2.4-litre engine in the K-series - the long-stroke sibling of the 2.0-litre K20, with the same bore but a longer stroke. It is DOHC i-VTEC (VTEC plus VTC cam phasing on the intake cam), chain-driven and has an aluminium block with cast-in iron liners. The bottom end is robust and durable. What needs attention is in the cam phasing and the surrounding systems: the VTC actuator rattles on cold start, the timing chain tensioner wears, and the exhaust cam's VTEC system sticks on high-mileage examples. The K24 is also an interference engine, so a timing chain failure causes bent valves. We do everything from cylinder head reconditioning to complete engine reconditioning with our own machine shop and a 12-month warranty.
The K24 at a glance
Shared baseline data for the K24 family. Torque specs read from Honda's factory manual (Accord L4-2.4L FSM) and cross-verified. Variant-specific deviations are listed in the table below.
| Variant | Year | Power | Torque | Compression |
|---|---|---|---|---|
| K24A1 (CR-V) | 2002-2006 | 160 hk | 220 Nm | 9,6:1 |
| K24A4 (Accord, Element) | 2003-2005 | 160 hk | 218 Nm | 9,7:1 |
| K24A2 (Acura TSX CL9) High output | 2004-2008 | 197-205 hk | 222 Nm | 10,5:1 |
| K24A3 (Euro/AUDM Accord) High output | 2003-2008 | 190 hk | 232 Nm | 10,5:1 |
| K24W (Accord Earth Dreams) Direct injection | 2013-2017 | 185-189 hk | 245 Nm | 11,1:1 |
Torque specs
Read from Honda's factory manual (Accord L4-2.4L Factory Service Manual, K24A 2003/2005 and K24Z 2008) and cross-verified. Values are for oiled threads. Honda gives its torques in N-m (as well as kgf-m and lbf-ft); the Nm values below are the factory values. Stretch bolts (head, rod) are torqued by angle - always fit new ones. The K24 has an aluminium block with cast-in iron liners.
Cylinder head & valvetrain
Engine block & bottom end
Intake & exhaust
Note - Stretch bolts: head and rod bolts are angle-torqued stretch bolts (TTY). Honda specifies checking the shank diameter and discarding them if stretched, and Meksta always fits new bolts on disassembly. The head bolt is torqued to 39 Nm in sequence, then +90° and +90°; a new bolt gets a third +90° (a total of 39 Nm + 90° + 90° + 90°). Never back off an over-torqued bolt - loosen it fully and start again.
NOTE - Rod bolts differ by generation: The K24A generation (2003/2005 Accord K24A4 FSM) uses 20 Nm + 90°. The K24Z generation (2008+ Accord) uses 41 Nm + 120°. This is not a contradiction but a real difference between the generations - always use the right value for the right engine and never mix them up.
NOTE - Crank pulley: the base spec of 49 Nm + 90° applies to all generations and is applied with a torque wrench and a 19 mm socket, never with an impact wrench. On the K24Z (2008+) there is an extra step when the bolt or crankshaft is new: torque first to 177 Nm, loosen the bolt fully, then torque to 49 Nm + 90°.
NOTE - i-VTEC and VTC: The K24 has VTEC plus VTC cam phasing on the intake cam. The exhaust cam sprocket bolt (72 Nm) and the VTC actuator bolt (113 Nm) have their own torques. We replace a worn VTC actuator and check the timing chain tensioner at every head reconditioning.
Factory tolerances (bearing clearance, deck height, piston clearance) for the K24 are documented separately and published once cross-verified. All dimensions are measured against factory tolerances with our own machine shop.
Common faults on the K24
This is what we see most often when a K24 comes in. Symptoms, causes and how we fix it.
VTC actuator rattles on cold start
Common • Medium- Symptoms
- A hard rattle or clatter for 1-3 seconds on cold start from the timing chain side. It goes away as oil pressure builds. It can throw a camshaft control fault code.
- Cause
- The VTC actuator (the cam phasing on the intake cam) develops worn locking pins and spring and knocks until oil pressure locks it. Neglected oil changes and thin oil accelerate the wear. Very common on high-mileage K24s.
Timing chain tensioner and chain wear
150 000+ km • High- Symptoms
- Persistent chain rattle that does not go away when the engine warms up, cam position fault codes, in the worst case a skipped chain. Since the K24 is an interference engine, a skipped or broken chain causes bent valves.
- Cause
- The hydraulic timing chain tensioner and guide rails wear over time. Neglected oil changes and a low oil level shorten their life. It should be dealt with before the chain skips.
High oil consumption (piston rings / valve stem seals)
High mileage • High- Symptoms
- Rising oil consumption, blue smoke under acceleration or on cold start, an oil level that drops between services. Common on high-mileage Accord and CR-V.
- Cause
- Stuck or worn oil control rings and aged valve stem seals after high mileage. Some model years are especially prone. Requires cylinder head reconditioning or a ring change depending on where the oil is going.
Oil leaks (valve cover & crankshaft seal)
Common • Medium- Symptoms
- Oil on the front of the engine, a smell of oil, drips under the engine. Oil in the spark plug wells from the valve cover gasket.
- Cause
- An aged valve cover gasket and worn crankshaft seals (front/rear). Common and not serious in itself, but oil on hot exhaust parts is a fire risk and should be dealt with.
Exhaust cam VTEC sticks / fault code
Common on high-rpm variants • Medium- Symptoms
- Lost top-end power, a VTEC system fault code, a rough transition. Most noticeable on the high-output variants (K24A2/A3) with VTEC on both cams.
- Cause
- The VTEC solenoid and the oil passage filters clog with oil sludge, or the VTEC pins wear. Neglected oil maintenance is the most common cause. Cleaning or replacing the solenoid usually solves the fault.
Big-end and main bearing wear
High mileage • Critical- Symptoms
- A knocking noise from the lower engine under load, low oil pressure, metal shavings at oil changes.
- Cause
- Worn bearing shells after high mileage, oil starvation or neglected oil maintenance. Hard-driven turbo and swap builds wear faster. Requires crankshaft grinding and new bearings.
K24 rebuild prices
Prices based on K24 specifications: 4-cyl inline, 87 mm bore, 16 valves, 5 main bearings + 4 rod bearings. We carry out cylinder boring, crankshaft grinding and cylinder head resurfacing with our own machine shop. All prices exclude VAT and parts.
Cylinder head reconditioning
Bottom end
Full rebuild
Performance
Cylinder machining (4-cyl, 87 mm bore)
| Service | Price |
|---|---|
| Cylinder boring 4-cyl inline block (87 mm) | 3 318 kr |
| Plateau honing 4 cyl | 1 050 kr |
| Stress boring 4 cyl | 4 603 kr |
| O-ringing block 4 cyl (high-boost) | 2 800 kr |
| Deck decking block 4 cyl | 1 974 kr |
Crankshaft work (5 main + 4 big-end, DOHC cam journals)
| Service | Price |
|---|---|
| Crankshaft grinding (5 main + 4 big-end) | 3 010 kr |
| Polishing standard | 1 022 kr |
| Cleaning 4-cyl crankshaft | 784 kr |
| Straightening (medium) | 1 190 kr |
| Camshaft journal grinding 10 pcs (DOHC) | 3 080 kr |
| Remove/fit counterweights 8 pcs | 2 044 kr |
Valve reconditioning (16 valves)
| Service | Price |
|---|---|
| Cutting 16 valve seats (standard) | 1 820 kr |
| Cutting 16 valve seats (large) | 2 772 kr |
| Valve guide replacement 16 pcs (light alloy) | 2 548 kr |
| Manufacture of valve seat inserts 16 pcs | 3 080 kr |
| Bronze sleeves fitting 16 pcs | 2 268 kr |
Cylinder head resurfacing (4 cyl, standard head size)
| Service | Price |
|---|---|
| Resurfacing cylinder head 4 cyl (standard) | 1 330 kr |
| Resurfacing cylinder head 4 cyl (large) | 1 596 kr |
| Resurfacing block 4 cyl (standard) | 1 988 kr |
| Resurfacing block 4 cyl (large) | 2 114 kr |
| Resurfacing manifold 4 cyl | 2 842 kr |
Con-rod work (4 pcs)
| Service | Price |
|---|---|
| Replace con-rod bush 4 pcs | 2 240 kr |
| Manufacture con-rod bush 4 pcs | 2 898 kr |
| Length adjustment con-rod 4 pcs | 2 898 kr |
| Replace press-fit piston 4 pcs | 1 582 kr |
| Replace piston ring 4 pcs | 1 106 kr |
| Resizing big-end housing 4 pcs | 2 352 kr |
| Check/straighten con-rod 4 pcs | 1 414 kr |
| Full reconditioning con-rod 4 pcs | 3 164 kr |
| Steel shot peening con-rods 4 pcs | 2 268 kr |
Pressure testing & balancing
| Service | Price |
|---|---|
| Pressure testing cylinder head 4 cyl (small) | 1 876 kr |
| Pressure testing cylinder head 4 cyl (large) | 2 800 kr |
| Pressure testing cylinder block | 1 400 kr /h |
| Balancing rotating assembly straight 4-cyl | 3 742 kr |
| Weight matching con-rods 4 pcs | 1 316 kr |
| Weight matching pistons 4 pcs | 1 092 kr |
| Flywheel balancing | 2 100 kr |
| Balancing flywheel + clutch | 2 842 kr |
Indicative prices for the K24 configuration (4-cyl inline, 87 mm bore, 16 valves, alloy head, aluminium block with cast iron liners). Labour prices exclude VAT and parts (piston rings, bearings, gaskets, stretch bolts). Request a quote for an exact price after inspection.
Tuning the K24
The K24 is a reliable NA engine and one of the most popular swap and turbo bases. NA gives modest gains, but the bottom end takes boost well - the big power comes from a turbo or supercharger conversion on forged internals.
- 1
Intake, exhaust & engine optimisation
A freer intake, a header (4-2-1), an exhaust system and a well-developed cam profile give a modest but noticeable NA gain with better response. The K-series responds well to head porting.
210-230 hk - 2
Turbo / supercharger, low boost
A turbo kit or supercharger with a fuel system and management. The stock bearings handle low boost well with the right margins and turbo work.
300-350 hk - 3
Forged internals + turbo
Forged pistons and con-rods, ARP bolts, balancing and a larger turbo. This opens the power window right up.
400-450 hk - 4
Full build
A complete bottom end, a ported cylinder head and a big turbo for track and drag. We build the whole chain in-house with performance engine building.
500+ hk
Questions & answers about the K24
What we hear most often from K24 owners.
What does it cost to rebuild a Honda K24?
A cylinder head reconditioning costs about 5 000 - 7 000 SEK (labour), a complete engine reconditioning about 19 500 - 30 500 SEK. On top of that come parts (gasket, bearings, piston rings, stretch bolts), typically 7 000 - 18 000 SEK depending on condition and variant. We give a fixed quote after inspection.
Is the Honda K24 an interference engine?
Yes. The K24 is an interference engine. If the timing chain jumps or breaks, the valves hit the pistons, causing bent valves and often secondary damage. That is why the timing chain guide rails and the hydraulic tensioner are critical - we check and replace them during a rebuild.
What is the difference between the K20 and the K24?
The K24 is the 2.4-litre version of the same K-series as the 2.0-litre K20. Both have an 87 mm bore, but the K24 has a longer stroke (99 mm versus the K20's 86 mm), which gives 2 354 cc and more torque lower in the rev range. The K20 revs higher and is often found in the Civic Type R and Integra. Both are DOHC i-VTEC with a timing chain and share much of the same architecture - which is why the K-series is so popular to swap and build.
How long does a rebuilt K24 last?
With a proper rebuild and regular maintenance: 250 000 - 350 000 km or more. The bottom end is durable. Keep an eye on oil quality and oil change intervals, the timing chain and VTC, and the K24 is one of Honda's most durable engines.
Can you tune a K24?
Yes. NA gives modest gains through intake, exhaust, cams and mapping. The big power comes from a turbo or supercharger: on stock bearings you often build 300-350 hp, and with forged internals 400-500 hp or more. Many use the K24 (often with a K20 head, a so-called Frankenstein build) as a base for swap and turbo builds thanks to its robust bottom end.
What is the VTC rattle on the K24?
The VTC actuator (the cam phasing on the intake cam) can rattle for a couple of seconds on cold start before oil pressure builds up and locks it. It is caused by worn locking pins and spring, often after neglected oil maintenance. We replace the actuator and check the timing chain tensioner as part of a cylinder head reconditioning.
Should you rebuild or replace the engine?
For the K24: it often comes down to price and availability. Used K24s are common but have unknown history and the same wear points (VTC, timing chain, oil consumption). A rebuilt engine has known tolerances, new wear parts and a 12-month warranty. We ship worldwide.
See also: other popular DOHC fours we rebuild and build - Toyota 4A-GE and Volvo B230. We service and build Honda's K-series from cylinder head reconditioning to complete turbo builds.
Got a K24 that needs looking at?
Call us directly or send in a quote request. We reply within 24 hours.