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Mitsubishi engine parts · oil-pump purchase-verification guide
Mitsubishi 4D56 Oil Pump Guide: How to Check 21340-42106 and 21340-42501
A search for a Mitsubishi 4D56 oil pump may show 21340-42106, 21340-42501, and the unhyphenated reference 2134042106 together. That grouping helps a buyer find a relevant listing, but it does not prove that the numbers are interchangeable or that one pump fits every engine described as 4D56 or 4D56T. The safe buying decision starts with the exact engine, application, current catalog record, and removed pump.
Why 21340-42106, 21340-42501, and 2134042106 Need Separate Verification
The current IZUMI ORIGINAL 4D56 oil pump product page identifies the item as an oil pump and places all three references in its title. That is verified page content. The title does not, however, document whether the references are punctuation variants, replacements, market-specific identifiers, or separate configurations. It also does not define a serial range or every application. Those questions must remain open until a current, application-specific source answers them.
This distinction matters because an engine-family label is a starting point, not a complete purchase specification. Engines that share a family name may appear in different equipment, production periods, or service histories. A machine may also contain a replacement engine or a previously changed front cover, oil system component, or short block. The buyer needs evidence from the engine that is actually being repaired.
The broader Mitsubishi parts collection and engine-parts directory are useful for navigating related products. They do not replace a current parts-catalog lookup. A matching photo, similar housing shape, or repeated web reference cannot establish hidden oil-passage alignment, mounting details, drive arrangement, relief-valve configuration, or suitability for a particular build.
Build the 4D56 Engine and Equipment Identity File First
Photograph the complete engine identification plate or stamping before parts are removed. Take a straight-on image, close-ups of every field, and a wider photograph showing where the identification is located. Transcribe the model, serial number, build or specification code, and any other visible identifier exactly. Do not fill missing data from memory or from another engine that looks similar.
Record the equipment or vehicle information separately. Include manufacturer, model, serial or chassis information, market, and any known engine replacement history. Keep machine data and engine data in different fields so a supplier can see which identifier comes from which source. If the machine record and engine record conflict, resolve that history before ordering.
Next, retrieve the current parts information for the verified configuration. Save the lookup date, catalog source, illustration or group, item description, number, quantity, and any replacement note displayed by the source. A cropped screenshot showing only a number is weak evidence; preserve enough context to connect the result to the engine or application. If a supplier proposes a different reference, ask for a written explanation tied to the same identification record.
Minimum evidence to send with an inquiry
- Complete engine identification photographs and a typed transcription.
- Equipment or vehicle model and serial/chassis data, labeled separately.
- Current catalog evidence showing the lookup context and date.
- Old oil-pump markings, package labels, and prior invoice numbers if available.
- Clear photos of the removed pump from every side, including mounting and drive features.
- Workshop inspection notes, required quantity, destination, and requested supply scope.
Separate the Lubrication Diagnosis from the Purchase Decision
An oil-pressure warning, unusual noise, wear, or contamination does not identify the pump by itself. The workshop should diagnose the lubrication system with the correct service information for the verified engine and application. Oil condition, level, viscosity, filter condition, pickup and sealing, passages, clearances, pressure-control components, instrumentation, and prior repair work may all require investigation. This guide does not assign a universal cause or provide a universal test value.
Document what was observed, how it was tested, the instrument used, the operating conditions, and which manual procedure controlled the test. Keep measured results separate from interpretation. If the removed pump is disassembled, preserve photographs and inspection notes before cleaning or disposal. Mark the orientation of parts only as permitted by the workshop procedure, and prevent components from different jobs being mixed.
The correct repair scope should follow the diagnosis. A pump purchase may be part of the repair, but related damage or contamination may require additional inspection and cleaning. Conversely, replacing a pump without confirming the fault can leave the original problem unresolved. The person responsible for the repair should approve the diagnosis and the parts list before the buyer requests a final quotation.
A Practical 4D56 Oil Pump Part-Number Workflow
1. Record each reference exactly as observed
Create a worksheet with separate rows for 21340-42106, 21340-42501, and 2134042106. For each row, note whether the number came from the old part, package, invoice, catalog, product page, or supplier quote. Preserve punctuation and leading characters. The fact that search engines normalize hyphens does not authorize the buyer to merge catalog references.
2. Match the reference to a catalog position
Read the result in context: verified application, illustration, item position, description, quantity, and notes. Confirm that the catalog is describing the oil pump or the exact assembly being offered, rather than a related cover, gear, gasket, pickup, or service component. A familiar number in an unrelated catalog position is not a match.
3. Compare the old pump without relying on appearance
Photograph all casting, stamped, etched, and label information. Capture the drive interface, mounting face, visible passages, fastener locations, relief components, and connections without assuming what any feature proves. A qualified workshop may record dimensions or clearances using the correct procedure, calibrated tools, and applicable limits. This article deliberately supplies no universal measurements.
4. Define the commercial supply scope
Ask whether the offer is a bare pump, assembled pump, pump with gear, or another stated configuration. Require a line-by-line list of included components, seals, gaskets, fasteners, and quantities. Product images may be illustrative or may show items that are not in the quoted package. The approved written quotation should control the purchase scope.
5. Resolve every mismatch before payment
If the old marking, catalog result, supplier number, label, or visible configuration differs, stop the order. Ask for traceable catalog evidence, current label photographs, and a written fitment statement tied to the submitted identifiers. Do not choose the number that appears most often online, and do not treat a seller's list of search terms as proof of supersession.
| Evidence | What to capture | What it does not prove alone |
|---|---|---|
| 21340-42106 | Source, exact spelling, catalog context, date, and associated application | Equivalence to 21340-42501 or universal 4D56 fit |
| 21340-42501 | Catalog position, description, quantity, notes, and supplier offer line | A replacement relationship not shown by a current source |
| 2134042106 | Where the unhyphenated form appears and which page or document produced it | That punctuation is the only difference between two references |
| Old pump | All markings, labels, damage, mounting face, drive, passages, and job identity | That prior repairs used the correct component |
| Product photo | Visible features, label, packaging, image date, and quote reference | Hidden geometry, measured conformity, current stock, or supplied contents |
| Written quote | Offered number, contents, quantity, selection evidence, and open conditions | Installation approval until receiving inspection is complete |
Supplier and Quote Verification Checklist
- The quote identifies the engine and equipment records used for selection.
- The supplier states the offered part number exactly as it will appear on the label and invoice.
- 21340-42106, 21340-42501, and 2134042106 remain separate references unless current evidence documents their relationship.
- The catalog source, lookup date, illustration or group, and item description are recorded.
- Old-pump markings and multi-angle photographs have been reviewed.
- The quote defines whether the offer is a bare pump, assembly, or another configuration.
- Every included gasket, seal, gear, fastener, accessory, and quantity is stated in writing.
- Any mismatch between the catalog, old part, and offered item has a traceable explanation.
- The workshop confirms required checks using the correct application-specific service information.
- Packaging unit and total quantity match the approved repair plan.
- Stock, price, dispatch date, certification, and warranty are confirmed only in the current quotation.
- The quotation identifies missing evidence and conditions that still require approval.
Receiving and Pre-Installation Checks
Quarantine the shipment until receiving inspection is complete. Photograph the outer package, shipping label, product label, seals, protective plugs, and the component from all sides. Match the invoice and labels to the approved quotation. Count all items and verify the stated supply scope before discarding packaging.
Compare the new and removed pumps side by side, but treat appearance as a screening step rather than final proof. Record differences in mounting faces, drive features, visible passages, connections, housing marks, and supplied accessories. Send unexplained differences to the supplier and the person responsible for the repair. Do not machine, modify, disassemble, or install the new part while approval is pending.
Installation details must come from the correct workshop manual and the approved repair procedure. The workshop should determine the required cleanliness controls, related-component checks, sealant or gasket use, priming method, fastener values, lubricant, and post-start verification. This guide intentionally gives no torque, pressure, clearance, or priming specification because those values must match the verified application.
Frequently Asked Questions
Are 21340-42106 and 21340-42501 interchangeable 4D56 oil pump numbers?
This guide does not claim interchangeability. The references appear together on the current product page, but the buyer must confirm their relationship through the verified application, current catalog, old-part evidence, and a written supplier response.
Is 2134042106 simply 21340-42106 without hyphens?
It may function as a search-format variant on some pages, but formatting similarity alone is not a purchasing decision. Preserve the exact form from each source and confirm the offered label and catalog record before payment.
Can I order a Mitsubishi 4D56 oil pump using only the engine model?
No controlled purchase should rely on the family name alone. Send engine and equipment identification, serial or build data when present, current catalog evidence, old-pump markings, photographs, workshop findings, quantity, and destination.
Does an oil-pressure warning prove that the pump is faulty?
No. The symptom requires diagnosis under the correct service procedure. The workshop should examine the full lubrication system and measurement context before approving a pump replacement or related repair scope.
What should a supplier confirm in writing?
Ask for the offered number, evidence used to select it, the identifiers reviewed, exact supplied contents and quantities, explanation of any cross-reference, current commercial terms, and any condition that remains subject to inspection.
What if the new pump looks different from the removed pump?
Stop and document every difference. Preserve the packaging, compare the catalog and quote, and request written clarification. Visual difference does not automatically mean wrong, but it must not be dismissed without traceable approval.
Turn the Search Reference into a Verifiable Purchase
Request a 4D56 oil pump check. Send the engine and equipment identification, serial or build data when available, current catalog record, old-pump markings, multi-angle photographs, diagnosis notes, required quantity, desired supply scope, and destination through the IZUMI ORIGINAL contact page. Ask the quotation to state the offered number and the evidence used to match it.
Technical reference basis: Current IZUMI ORIGINAL Blog, News, Mitsubishi collection, engine-parts directory, contact page, and English 4D56 oil-pump product page were reviewed on 8 October 2026. The product page identifies the item as an oil pump and co-lists 21340-42501, 2134042106, and 21340-42106. Co-listing is not treated as proof of equivalence. No dimensions, pressure values, torque values, serial-number range, application, OEM identity, stock, price, certification, shipping promise, or warranty term is asserted here.
