Rocker Arm Set 13257-40F06 – Verified Fitment for Nissan KA24E

Variant Differences Verified — Every superseded number from 13257-40F06 through 13257-40F17 is physically measured against your cylinder head casting before dispatch.

Technical Specifications

Application Suitability

Why the Same Rocker Arm Set for Nissan KA24E Ships in Four Variants

Part number revisions across production years change shaft bore tolerance and rocker tip geometry, not just the label on the box.

When a Nissan Pickup 2.4L comes into a Chilean mining workshop with valve train noise, the mechanic pulls the old rocker arm and reads a number like 13257-40F07 or 13257-40F16. Those numbers are all cross-reference entries for the same base Rocker Arm Set for Nissan KA24E / cross reference 13257-40F06 fitment family, yet they represent distinct shaft bore tolerances and pivot contact profiles. [NEED_CITE: Nissan KA24E valve train service manual variant identification] Ordering blindly from a copied cross-reference table means the set arrives, the shaft slips loosely or binds on the head casting, and the machine sits idle while a replacement is sourced. I have handled warranty returns where the outer diameter matched perfectly but the shaft bore was off by a few hundredths of a millimeter — enough to cause persistent ticking under load and accelerated wear on the cam lobe contact face.

Mapping the Superseded Number Chain to Your Engine Serial

The progression from 13257-40F06 through 13257-40F07, then 13257-40F16, and finally 13257-40F17 reflects running changes Nissan made to the KA24E cylinder head casting and valve train geometry. Each revision altered the rocker arm pivot point or the shaft bore tolerance to address noise or wear complaints reported in specific model year ranges. A Rocker Arm Set for Nissan KA24E ordered under the earliest number may physically fit a later head, but the rocker tip contact pattern on the valve stem will be offset, concentrating load on one edge. Confirming which number applies to your engine serial range eliminates this mismatch before the set leaves the warehouse.

Shaft Bore, Mounting Pattern, and Rocker Tip Profile

Three physical dimensions determine whether this replacement rocker arm set seats correctly on your KA24E cylinder head. The shaft bore must match the head's rocker shaft diameter within the production tolerance for your model year. The mounting bolt spacing must align with the tapped holes in the head casting — a change introduced mid-production shifted this pattern slightly on certain Stanza and Axxess variants. The rocker tip profile that contacts the valve stem tip must match the stem diameter and hardness; an incorrect profile causes accelerated stem wear. [NEED_CITE: SOHC valve train rocker tip contact geometry standards] Our team measures these dimensions against the removed set or the head casting photograph you provide.

Reading Specs That Determine Real Fitment

The SOHC 12-valve configuration of the KA24E means this Rocker Arm Set includes both intake and exhaust rockers, and they are not interchangeable — the intake rocker has a different leverage ratio and tip offset compared to the exhaust. The new aftermarket condition ensures each arm is produced to the dimensional specification of the correct variant rather than reconditioned from a worn core. ISO 9001 manufacturing oversight covers bore tolerance, surface finish on the cam contact pad, and hardness of the pivot bore. These parameters directly affect how long the set maintains proper valve lash adjustment under continuous operation in demanding environments like mining haul roads.

The Hidden Cost of a Variant Mismatch

A rocker arm that is dimensionally close but not exact for your head casting does not simply fail outright — it produces a subtle ticking that mechanics chase through multiple valve adjustments, or it wears the cam lobe contact face prematurely, forcing a cylinder head removal that was never part of the original repair scope. I have seen fleet workshops in Peru receive a set that appeared correct, install it, and only discover the problem when the engine came back with valve stem scoring after a few thousand kilometers. The return freight, the second teardown, and the lost vehicle availability compound the initial savings into a much larger loss. [NEED_CITE: valve train misalignment failure modes in SOHC engines]

What Sets This Sourcing Apart

Our own production lines and qualified sourced supply carry the same quality control and warranty terms, so whether your Rocker Arm Set for Nissan KA24E / cross reference 13257-40F06 fitment comes from our facility or a certified partner, the inspection standard is identical. Eight product categories under one account mean you can add valve stem seals, gasket sets, and timing components to the same consignment without managing separate suppliers. We accept orders from a single piece, which matters when one machine is down and you need to verify fitment before committing to a fleet quantity. Part identification works from the number, the machine model, a photograph, or even a painted-over nameplate image. Cross-reference verification covers every superseded and alternate number in the chain from 13257-40F06 through 13257-40F17. A sample set ships for physical fitment confirmation before you place the bulk order.

Documentation & Verification

• Commercial invoice listing each rocker arm variant and corresponding engine serial range
• Cross-reference sheet mapping 13257-40F06 through 13257-40F17 (reference only) to your specific KA24E
• Dimensional inspection record covering shaft bore, bolt pattern, and rocker tip profile
• Warranty terms document specifying coverage period and claim procedure
• Packing photographs showing set completeness before crate closure
• HS code and customs classification support for international shipment

Fitment Check Before Installation

• Compare shaft bore diameter on each new rocker against your removed set or head shaft measurement
• Verify intake and exhaust rocker orientation — they are not interchangeable on the KA24E SOHC head
• Check mounting bolt hole alignment with the cylinder head tapped holes before torquing
• Inspect rocker tip contact face for proper engagement with the valve stem tip
• Test-fit one cylinder's intake and exhaust pair before assembling the full set across all cylinders

Requesting an Accurate Fitment Quote

Send us your engine serial number, vehicle identification number, or clear photographs of the old rocker arms and the cylinder head casting. If the nameplate is worn or painted over, provide the vehicle model and year — that is often sufficient to narrow the variant. For fleet orders, a sample set is available for physical trial fitment before you commit to full quantity.

Frequently Asked Questions

Q: How do I confirm which of the four part numbers fits my KA24E? A: Provide your engine serial number or VIN. Each variant in the chain from 13257-40F06 through 13257-40F17 corresponds to specific production date ranges and cylinder head castings. We cross-reference your serial against the manufacturing records and verify shaft bore dimensions before confirming the correct set. Photographs of your existing rockers also help when numbers are worn.

Q: My old rocker arm has a number that does not appear in your list — can you cross-reference it? A: Yes. Send a clear photograph of the stamped number on your existing rocker arm. Our technical team checks it against the superseded number chain and alternate casting numbers that may not appear in standard aftermarket catalogs. If the number belongs to a variant outside the KA24E family, we will tell you directly rather than ship an incorrect part.

Q: I only have the vehicle model and year, no part number — is that enough? A: In most cases, yes. The vehicle model and production year narrow the fitment to one or two variants. We may ask for the engine serial or a photograph of the cylinder head casting to resolve any remaining ambiguity. For Nissan Pickup and Hardbody models spanning 1989-1997, mid-production changes mean the year alone sometimes covers two different rocker arm configurations.

Q: Are intake and exhaust rocker arms identical in this set? A: No. The KA24E SOHC 12-valve head uses different rocker profiles for intake and exhaust valves, with distinct leverage ratios and tip offsets. This Rocker Arm Set includes the correct quantity and type for a complete head — mixing intake and exhaust positions causes improper valve lift and accelerated cam lobe wear.

Q: Can I order a sample set to test-fit before placing a larger order? A: Yes, single-piece orders are accepted. We recommend ordering one complete set for physical fitment on one cylinder before committing to bulk quantity across a fleet. This eliminates the risk of a variant mismatch affecting multiple vehicles simultaneously.