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

Cross-Reference Verified — Superseded and alternate numbers for 13257-40F06 mapped against Nissan KA24E engine serial variants before dispatch.

Technical Specifications

Application Suitability

Why the Same Rocker Arm Number Ships in Multiple Variants

The correct variant depends on your engine serial range, not just the base number stamped on the old part.

Across the KA24E production run from 1989 to 1997, Nissan revised the Rocker Arm Set for Nissan KA24E multiple times. The base casting may look identical, but bore clearance, rocker geometry, and shaft interface dimensions shifted between model years. Copied cross-reference tables frequently carry errors forward, listing alternate numbers that belong to different production batches. I once watched a workshop force-fit a rocker arm set where the shaft bore was barely off tolerance — the engine ran for two weeks before the shaft journals scored badly enough to require a full head teardown [NEED_CITE: valve train wear progression from bore-to-shaft clearance mismatch].

Fitment Coverage Across the KA24E Family

This aftermarket Rocker Arm Set for Nissan KA24E covers the 2.4L SOHC 12V configuration found in the Pickup, Stanza, 240SX, and Axxess. Each model year within the 1989–1997 range may reference a different superseded part number. We verify which variant — whether 13257-40F06, 13257-40F07, 13257-40F16, or 13257-40F17 — corresponds to your specific engine build before confirming the order.

Interface Verification Before You Commit

The critical check on any rocker arm is the bore-to-shaft interface. Bearing clearance in the 0.02–0.05 mm range must match the shaft condition on your engine. A worn shaft paired with a new rocker at the tight end of tolerance will gall within hours. I verify bore dimensions and rocker arm pivot geometry against the engine serial range, not just the catalog number [NEED_CITE: rocker arm bore and shaft interface measurement standards for SOHC engines].

Reading the Dimensions That Actually Matter

Bearing clearance of 0.02–0.05 mm governs oil film thickness between the rocker arm bore and the shaft. Too tight and the oil wedge collapses under valve spring load; too loose and you hear the clatter on cold start before the engine reaches operating temperature. The SOHC 12V layout on the KA24E places each rocker directly on the shaft, so any dimensional error repeats across all eight intake and four exhaust positions. The complete set arrives matched — mixing old and new rockers on the same shaft creates uneven loading that accelerates wear on adjacent lobes. Assembly state as a complete set ensures consistent bore sizing across every position, which matters when the shaft itself is being reused from the original build.

What Happens When the Wrong Variant Gets Installed

A rocker arm that is dimensionally close but not exact for your KA24E variant will mount and run — briefly. The early symptom is increased valve train noise that gets blamed on worn lifters or a weak tensioner. By the time the real cause surfaces, the shaft journals are scored and the cam lobe faces show abnormal wear patterns. Return freight on a misidentified set is the smaller cost; the head teardown and replacement shaft are where the real expense lands [NEED_CITE: secondary damage from incorrect rocker arm fitment on SOHC valve trains].

Why Procurement Teams Source This Part Here

Own production on selected lines and qualified sourced supply sit under one account with the same warranty terms, so a Rocker Arm Set for Nissan KA24E carries the same QC whether it comes off our line or a partner facility. Eight product categories mean the valve cover gasket, shaft, and seal kit ship in one consignment. Minimum order is one set — useful when a single engine is down and you need to confirm fitment before committing to fleet quantities. Cross-reference verification covers every superseded and alternate number in the KA24E lineage. A sample set goes out first when the buyer needs physical confirmation before a bulk release.

Documentation & Verification

• Commercial invoice listing each cross-reference number as reference only
• Fitment sheet mapping your engine serial to the correct superseded variant
• Dimensional inspection record covering bore clearance and pivot geometry
• Warranty terms document covering manufacturing defects for 3–12 months
• Packing photographs taken before crate closure for condition record
• HS code and customs classification support for international shipment

Fitment Check Before Installation

• Compare new rocker arm bore diameter against your existing shaft measurement
• Verify rocker pivot contact face geometry matches the cam lobe profile on your KA24E
• Slide each arm onto the shaft by hand — any binding indicates a tolerance mismatch
• Check valve stem contact pad alignment before torquing the shaft pedestals
• If any arm fails the hand-slide test, stop and contact us with your engine serial

Inquiry Guidance

Provide your Nissan model, year, and engine code KA24E along with any readable number from the old rocker arm or a photograph of the nameplate. If the nameplate is gone, the vehicle model and production year are enough for us to narrow down which superseded variant fits. For fleet orders, send the engine serial range so we can confirm coverage across every unit before quoting bulk quantities.

Frequently Asked Questions

Q: How do I confirm this rocker arm set fits my specific Nissan model and year? A: Send us your vehicle model, production year, and engine code. We cross-check against the full KA24E serial range to confirm which superseded number — 13257-40F06, -07, -16, or -17 — matches your build. A fitment sheet ships with every order showing the verified mapping.

Q: The old part number is barely readable — is it still valid or has it been superseded? A: Many original numbers from the early KA24E production years have been superseded. Even a partial number combined with your vehicle model and year lets us identify the correct current replacement. We verify the cross-reference before confirming your order.

Q: Why are there multiple numbers for what looks like the same rocker arm? A: Nissan revised the design across the 1989–1997 production span. Bore dimensions, pivot geometry, and shaft interface tolerances shifted between variants. Each number maps to a specific engine build window, and fitting the wrong one causes premature shaft and cam wear.

Q: I only have the vehicle model with no readable part number — can you identify the right set? A: Yes. Provide the model name, year, and confirm the engine is a KA24E 2.4L SOHC 12V. We narrow the correct variant from the production date and engine serial range. A photograph of the old rocker arm or nameplate helps speed up identification.

Q: Can I order one sample set to verify fitment before buying in bulk? A: Sample supply is standard practice. One complete set ships first so your workshop can confirm bore fit, shaft interface, and valve geometry on the actual engine. Once fitment is verified, the bulk order follows on the same verified part number.