Methodology & data sources

How the cross-reference is built, how sure we are of each claim, and what we do and don't publish.

What this site cross-references

• OEM ↔ OEM interchange — the same physical part shared across brands and marinizers.
• Marine ↔ aftermarket — impellers, filters, belts, anodes, thermostats, pumps, seals and bearings that have broad third-party interchange (Jabsco, Sierra, Mann, WIX, Gates, Tecnoseal and others).
• Marine ↔ industrial base engine — most marine diesels in scope are marinized tractor/industrial blocks (e.g. Kubota, Mitsubishi, Ford), whose internal service parts are sold far more cheaply through agricultural/industrial channels.

How the data is produced

Cross-reference edges are compiled from public manufacturer parts catalogues, published interchange lists, and third-party supplier data, then normalised into a single parts-and-equivalence graph. Part numbers are reproduced as factual reference data to aid identification and interchange.

Confidence levels

Every cross-reference carries a confidence flag so you can judge how well-corroborated it is:

• confirmed — corroborated against an authoritative or multiple independent sources.
• likely — supported by a credible source but not independently double-checked.
• unverified — a single or weak source; treat as a lead, not a guarantee.

A confidence flag is not a warranty of fit. Always verify a part number against an official source or dealer before ordering.

Copyright-safe boundary

We publish part-number equivalences and engine specifications as factual reference data. We do not redistribute the original OEM catalogue PDFs, dealer price lists, or any copyrighted document. All manufacturer names, part numbers and trademarks are the property of their respective owners.

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