S25166 Yanmar 4TNV84T Starter Motor 24V 4.5kW 15T

S25166 Starter Motor for Yanmar generator-set and compact equipment replacement supply Supply

S25166 is the Hitachi reference for a 24V, 15-tooth clockwise starter used in selected Yanmar 4TNV84T and 4TNV84T-DFM equipment, including generator sets. The supplier catalog rates it at 4.5kW, while public pages show 4.0kW. Confirm the approved rating, pinion diameter and mounting pattern before volume orders.

Elecdura Starter Motor Supply Overview

S25166 Starter Motor Specifications

Application and OE Cross-Reference Review for S25166

Yanmar 4TNV84T and 4TNV84T-DFM, including selected generator-set applications; confirm the engine variant and equipment record. Application data narrows the search; the complete OE number and physical starter remain the final fitment controls.

Before-Order Matching Checks for S25166

For Yanmar generator-set and compact equipment replacement supply, confirm the old-unit label, machine or vehicle record, electrical rating, drive end, mounting face and terminals before releasing a purchase order. Keep any rating conflict or suffix difference visible in the approval file instead of hiding it in a generic product description.

Yanmar generator-set and compact equipment replacement supply Receiving and Cost Control

Unit price is only one part of landed cost. A mixed rating, wrong pinion or unverified application can create returns, emergency freight and workshop downtime. Approve one traceable sample, record the critical identifiers and inspect incoming lots against the same baseline. Diagnose battery, cable, ground and ring-gear issues before condemning a replacement starter.

Wholesale Supply Information

S25166 Starter Motor FAQ

Which numbers identify S25166 in a buyer's catalog?

The key references are S25166 and S25166A, with Yanmar 129612-77010, 129612-77011, Prestolite 20513063 and other aftermarket codes appearing in public listings. Keep the full suffix and the old-unit label because S25-166 family listings can contain different ratings. Use the cross-reference to start the match, then approve the engine, mounting and electrical configuration.

Which Yanmar engines are commonly linked to S25166?

Repeated product pages link this family with Yanmar 4TNV84T and 4TNV84T-DFM, including generator-set applications. The exact equipment, engine variant and harness arrangement still need confirmation. Ask for the engine plate, equipment model and old starter photos before quoting. Do not treat a generic Yanmar description as proof that every 4TNV84T installation uses the same starter version.

Why does the catalog power rating differ from some public listings?

The supplied catalog records 24V and 4.5kW, while several public replacement pages for S25166 or 12961277010 show 4.0kW. That difference should be treated as a configuration question, not ignored. Compare the approved sample, old-unit marking, required cranking performance and physical data, then place the confirmed rating on the purchase order and inspection sheet.

What does the 15-tooth and 44mm pinion information control?

The pinion must match the ring gear in tooth count, outside diameter, engagement depth and rotation. Public descriptions identify a 15-tooth design and approximately 44mm pinion diameter for this family. Confirm the actual drive end and mounting orientation before release because a close-looking 24V starter can still damage the ring gear or fail to engage.

How should generator-set distributors control incoming quality?

Approve a sealed sample with photographs of the label, drive end, flange and terminal side. On receipt, sample-check 24V marking, the confirmed power rating, 15 teeth, clockwise rotation, pinion diameter, mounting ears, terminal positions and packaging. Record the inspection by lot and quarantine any 4.0kW or differently clocked unit until the customer application and supplier explanation are reconciled.

Can a 4.0kW replacement be used for a 4.5kW catalog item?

Not automatically. The lower rating may be suitable for a specific engine or generator set, but the supplier catalog and public listings do not establish universal interchangeability. Require the old-unit specification, engine model, battery system and cranking requirement, then approve the substitute in writing. Keep 4.0kW and 4.5kW versions as separate SKUs or purchasing lines.

What should be checked if a Yanmar engine cranks slowly?

Test battery condition and cranking voltage first, then measure cable and ground voltage drop and inspect the control circuit. Check the ring gear and mounting surface for damage before condemning the starter. Generator sets can sit unused, so corrosion or a weak battery may be the real cause. Attach the test record to the starter reference before opening a warranty case.

What details are needed for a wholesale quote?

Provide S25166 or the complete Yanmar reference, engine and generator-set model, quantity, destination and the required 4.0kW or 4.5kW rating. Add clear photos of the old label, 15-tooth drive end, mounting face, terminal side and any dimensional requirement such as pinion diameter. Include packaging, private-label, sample and inspection needs so one exact configuration is quoted.

Request a Quote for S25166 Starter Motors

Send the complete reference, application or engine data, old-unit photos, quantity, destination market and packaging or inspection requirements for a fitment-focused B2B quotation.