10 Pieces Cylinder Head Bolt 80105-76041-71 for Toyota 4Y – Verified Fitment

Verified Fitment — Every 80105-76041-71 cross-reference checked against Toyota 4Y engine variants before dispatch.

Technical Specifications

Application Suitability

Why the Same Part Number Ships in Four Variants

The base number alone does not guarantee the bolt threads into your specific cylinder head casting.

A single cylinder head bolt for Toyota 4Y engine applications can appear under multiple superseded references across different production years. Cross-reference tables get copied between sellers without verification, and a number that fits a 2012 6FGCU20 may not seat correctly in a 2018 8FGCU25 with a revised head casting. I have handled cases where a forklift sat idle for days because the bolt thread pitch matched the catalog but not the actual engine block on the shop floor [NEED_CITE: cylinder head bolt variant differences across Toyota forklift engine generations].

Fitment Range Across 150+ Forklift Variants

This Cylinder Head Bolt covers the full span of Toyota 4Y-powered models from the 2TG era through the current 8FG generation. The fitment list includes prefix series 02-, 04-, 30-, 32-, 40-, and 42-, spanning 5FG, 6FG, 7FG, and 8FG designations. Each model code represents distinct chassis and mast configurations, but the engine bolt pattern remains tied to the 4Y block revision rather than the forklift model year.

Thread Geometry and Flange Face Verification

The critical check goes beyond the part number. Shank diameter, thread pitch, and flange face profile must all align with your specific cylinder head. Early 5FG series heads use a slightly different bolt seat geometry compared to later 7FG and 8FG castings. The zinc-nickel surface treatment on this cylinder head bolt for Toyota 4Y engine provides corrosion resistance without altering the dimensional tolerance, but the underlying thread profile still needs physical verification against the head [NEED_CITE: fastener thread engagement standards for internal combustion cylinder heads].

Material Grade and Torque Behavior

The ISO 898-1 Class 10.9 rating means this fastener withstands the clamping load required for cylinder head sealing under combustion pressure. High-tensile alloy steel, heat-treated to this class, maintains preload through thermal cycling. The ±0.05 mm dimensional accuracy on shank diameter and length ensures consistent stretch behavior when torqued to specification. Using a lower-grade bolt in this position risks gradual preload loss, leading to head gasket failure between service intervals.

What Happens When the Wrong Variant Gets Installed

A bolt that threads in but seats incorrectly will fail silently before the next overhaul.

When a cylinder head bolt for Toyota 4Y engine fits the threaded hole but the flange face does not match the head casting surface, the clamping force distributes unevenly. This produces localized gasket compression loss, typically showing up as coolant seepage or combustion blow-by after several hundred operating hours. The forklift returns to the workshop with a head gasket diagnosis, but the root cause was a fastener variant mismatch [NEED_CITE: cylinder head fastener clamp load distribution and gasket failure modes].

Why Source From Here

Our technical team verifies each cross-reference number against the specific machine model and serial range you provide, not just a generic compatibility table. The cylinder head bolt for Toyota 4Y engine is available from one piece, so a workshop can order a sample set for physical trial fitment before committing to a fleet-level purchase. Both self-produced and sourced supply lines carry identical QC and warranty terms, keeping your procurement under a single account. Guangzhou warehouse stock enables fast dispatch on common variants, while less common model-specific bolts are sourced and verified within a standard lead time.

Documentation & Verification

• Commercial invoice listing each cross-reference number with reference-only marking
• Compatibility sheet mapping your forklift serial range to confirmed bolt variant
• Dimensional inspection record covering shank diameter, length, and thread pitch
• Warranty terms document specifying coverage period against manufacturing defects
• Packing photographs showing sealed anti-corrosion packaging before dispatch
• HS code and customs documentation prepared for international shipment

Fitment Check Before Installation

• Compare new bolt thread pitch and shank length against the removed OEM fastener
• Verify flange face profile matches the cylinder head casting seat surface
• Confirm torque specification aligns with ISO 898-1 Class 10.9 tightening sequence
• Check zinc-nickel plating integrity on each bolt before loading into the head
• Perform single-bolt trial fitment in one cylinder before installing the full set

Request a Fitment Confirmation

Send the forklift model code, engine serial number, or a photograph of the existing bolt alongside the nameplate. Our team will cross-check the variant, confirm the applicable superseded numbers, and advise whether a sample set is recommended before bulk ordering.

Frequently Asked Questions

Q: How do I confirm this bolt fits my specific forklift model? A: Provide your machine model code and engine serial number. We cross-check the cylinder head bolt variant against your specific production range, verifying thread pitch, shank length, and flange profile. A cross-reference sheet is supplied with the order showing confirmed compatibility for your equipment.

Q: The old part number is discontinued — how do I find the correct replacement? A: Superseded numbers like 90105-12952-71 and 9001A-10006 are verified against our fitment database. Send a photo of the old bolt or the worn nameplate, and we confirm which current production number matches your engine block casting and head revision.

Q: Why do different sellers list different cross-references for the same bolt? A: Cross-reference tables are often copied between listings without validation against actual engine variants. We verify each reference number against machine serial ranges and physical bolt geometry rather than relying on third-party catalog data.

Q: The nameplate is worn and only the machine model is readable — is that enough? A: The machine model alone narrows the range, but the engine serial confirms the exact variant. If the serial is inaccessible, we can supply a sample set for trial fitment, allowing you to verify thread engagement and flange seating before a full order.

Q: Can I get a sample before placing a bulk order? A: Yes. Single-piece orders are accepted, and we recommend ordering one set for physical installation trial on your specific engine. This confirms fitment before committing to fleet-level quantities.