VDS-3126-INJ-NOZZLE 3126 Unit Injector Nozzle Assembly for 3126-MUI
VDS-3126-INJ-NOZZLE for Caterpillar 3114 / 3116 / 3126 engines. Model 3126-MUI, 12 Months warranty, MOQ 1 piece. Supplied under the Vidishi Auto brand.
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Product Details
At a glance
Check fitment before you order
Built to model 3126-MUI and supplied new under the Vidishi Auto brand. The 10 specification rows below run from injector family through to shim; a row is only listed where the value is confirmed for this part.
Part number match
The order reference for this item is VDS-3126-INJ-NOZZLE, built to model
3126-MUI. Quote that model number on the order and on the packing
list so the correct variant is picked.
Fitment verification
Nozzle side of the Caterpillar 3114 / 3116 / 3126 mechanical unit injector, as used in 320B / 322B / 325B excavators, 924F / 950F wheel loaders, AP-1000 pavers, D5M / D6M tractors and CS-563 compactors. The nozzle assemblies in this family carry different part numbers (127-8216 / 0R-8682, 127-8222 / 0R-8461, 127-8213 / 0R-8473, 127-8218 / 0R-8684, 127-8225 / 0R-8469), so read the number stamped on the injector being rebuilt before ordering.
Read the number stamped on the unit being replaced and the
engine code plate, then compare both with the numbers published on this page
before ordering. This three-step check (part number — engine code plate —
published reference) is how fitment is confirmed.
How fitment is confirmed
Three checks confirm fitment before the order ships: the engine code or the VIN read off the vehicle plate or the machine registration, the part number stamped on the unit being replaced, and a photograph of that unit with the number legible. Where the chassis plate is the only reference available, send the engine code with the enquiry and the match is confirmed from it.
Category
This item sits in the site’s Fuel System > Injector Nozzles category. Ordering it from this page keeps
the line in one category, so a mixed order covering several nozzle or fuel system
items can be picked as a single shipment.
Specifications
| Injector family | Caterpillar 3114 / 3116 / 3126 mechanical unit injector |
|---|---|
| Nozzle type | Pintle nozzle assembly |
| Components | Nozzle body, needle, return spring, shim washer |
| Nozzle holes | 5 x 0.22 mm (published family specification) |
| Spray cone angle | 127 degrees (published family specification) |
| Opening pressure | 245 – 265 bar (published family specification) |
| Needle lift | 0.30 mm (published family specification) |
| Body material | Carburised and quenched alloy steel |
| Return spring | Chrome-vanadium alloy spring steel |
| Shim | Laser-marked graduated thickness washer |
| Model number | 3126-MUI |
| Reference | VDS-3126-INJ-NOZZLE |
| Product type | Injector Nozzle Assembly |
| Supplied brand | Vidishi Auto (not Caterpillar-branded) |
| Reference design | reference only — compatible replacement |
| Application | Caterpillar 3114 / 3116 / 3126 engines |
| Material | Hardened alloy steel nozzle body and needle, chrome-vanadium return spring |
| Condition | New |
| Warranty | 12 Months |
| Minimum order | 1 piece |
| Cross-reference | Caterpillar equipment identification only |
Two rows on this table decide most enquiries about the item: injector family and nozzle type. The remaining 8 rows separate this build from the neighbouring variants in the same family, so a buyer who reads only the first two should still check the rest against the unit being replaced.
Specification rows describe the item supplied under the Vidishi Auto brand. Fitment-relevant values must be confirmed against the unit being replaced; packaged shipping figures are not published because no source states them.
What the buyer gets
Eight of the 10 published specification rows are set out below. The rest are
in the specification table above.
Injector family
Caterpillar 3114 / 3116 / 3126 mechanical unit injector
Buyers ask for this one on almost every enquiry, so it is stated rather than buried in the table.
Nozzle type
Pintle nozzle assembly
This figure selects the variant rather than promising performance; the equipment documentation governs.
Components
Nozzle body, needle, return spring, shim washer
A buyer checks this on the this part first, because nothing else on the part can be confirmed without it.
Nozzle holes
5 x 0.22 mm (published family specification)
The bench test has to reproduce this number before the part is released.
Spray cone angle
127 degrees (published family specification)
For this this part, that figure decides whether the part can be used at all.
Opening pressure
245 – 265 bar (published family specification)
This figure selects the variant rather than promising performance; the equipment documentation governs.
Needle lift
0.30 mm (published family specification)
This variant separates itself from the neighbouring models in the same family.
Body material
Carburised and quenched alloy steel
The bench test has to reproduce this number before the part is released.
How it is used
Sequence
- Clean the unit injector body and its bore before the nozzle assembly is separated.
- Mark the shim and note its thickness before stripping, so the starting stack is known.
- Check the mating face of the injector body for fretting or a worn seat before fitting a new nozzle.
- Assemble dry, then set the needle lift and opening pressure on a test stand.
- Record the set pressure on the job card and refit the injector with a new seal.
Have these to hand first
- Nozzle retaining nut
- Shim washers in the thicknesses the target opening pressure needs
- Copper washer for the injector seat
The list is what the job consumes, not part of the item supplied
unless a specification row above says so.
or the vehicle service procedure. Torque figures, pressures and safety limits come from the
equipment documentation, not from this page.
Documented limits and things that go wrong
A nozzle assembly is matched to a shim stack. Fitting a nozzle without re-setting the stack changes opening pressure and delivery.
The published family figures for this injector – 245 to 265 bar opening pressure, 0.30 mm needle lift – are the reference points a test stand has to reproduce.
Mixing a new nozzle with five worn nozzles gives uneven delivery; the practical rule is a full set.
The item is the nozzle end of the unit injector, so the page type is ‘Injector Nozzle Assembly’ and never ‘complete injector’ – the images show nozzle body, needle, spring and shim only.
Nozzle hole count, spray cone angle, opening pressure and needle lift are carried as published family specifications for the 3114 / 3116 / 3126 mechanical unit injector, which is how the aftermarket catalogues present them.
The listing carries no part number for this nozzle, so the page publishes the family part numbers as an identification list and tells the buyer to read the number stamped on the injector being rebuilt; the SKU is built from engine parameter + product type rather than from a guessed number.
Symptom and first check
| Uneven idle straight after a nozzle change | the shim stack was not re-set, so the opening pressure is wrong for that injector. |
|---|---|
| Power down with black smoke | the nozzle holes are partly blocked or the spray pattern has distorted. |
| Fuel in the oil | the needle is not seating; check the seat and the needle for scoring before refitting. |
How we label data on this page
| Model number 3126-MUI | Published — stated on the specification table above |
|---|---|
| Product type and application | Published — stated on the specification table above |
| Fitment and duty limits | Confirm before order — must be checked against the equipment the item works on |
| Packaged shipping weight | Not published — no source states it for this exact part |
| Carton dimensions for multi-unit orders | Not published — quoted with the order against the actual quantity |
| Individual nozzle flow figure | Not published — the documentation available for this item does not state it |
| Retaining nut torque | Not published — the documentation available for this item does not state it |
| Seat face hardness figure | Not published — the documentation available for this item does not state it |
confirm. Ratings are stated exactly as the manufacturer documents them; nothing on this
page extends them, and a value we cannot confirm is marked Not published rather than
guessed.
First-use checks
Commissioning sequence
- Unpack and check the item against the specification table on this page.
- Confirm the model number 3126-MUI on the packing list matches the item received.
- Read the 10 specification rows that apply to your application before first use.
- Set the opening pressure on a test stand before the injector goes back into the engine; it cannot be set in the machine.
- Keep the shim stack and the nozzle as a matched set through the repair.
- Record the installation date so the inspection interval can be planned.
Before it goes into service
Record the set opening pressure on the job card; the next rebuild then starts from a known figure instead of from an assumption.
Warranty cover runs for 12 Months from delivery on the supplied item.
Where this injector nozzle assembly is used
Nozzle side of the Caterpillar 3114 / 3116 / 3126 mechanical unit injector, as used in 320B / 322B / 325B excavators, 924F / 950F wheel loaders, AP-1000 pavers, D5M / D6M tractors and CS-563 compactors. The nozzle assemblies in this family carry different part numbers (127-8216 / 0R-8682, 127-8222 / 0R-8461, 127-8213 / 0R-8473, 127-8218 / 0R-8684, 127-8225 / 0R-8469), so read the number stamped on the injector being rebuilt before ordering.
This injector nozzle assembly is supplied for Caterpillar 3114 / 3116 / 3126 engines. The application list below is built from the published fitment data for this part number rather than a generic catalogue sweep, which is why it is shorter and more specific than a parts-finder list.
- Caterpillar 320B excavator
- Caterpillar 322B excavator
- Caterpillar 325B excavator
- Caterpillar 924F wheel loader
- Caterpillar 950F wheel loader
- Caterpillar AP-1000 paver
- Caterpillar D5M / D6M tractor
- Caterpillar CS-563 compactor
Fitment verification: Nozzle side of the Caterpillar 3114 / 3116 / 3126 mechanical unit injector, as used in 320B / 322B / 325B excavators, 924F / 950F wheel loaders, AP-1000 pavers, D5M / D6M tractors and CS-563 compactors. The nozzle assemblies in this family carry different part numbers (127-8216 / 0R-8682, 127-8222 / 0R-8461, 127-8213 / 0R-8473, 127-8218 / 0R-8684, 127-8225 / 0R-8469), so read the number stamped on the injector being rebuilt before ordering.
The application list is a guide, not a guarantee of fit. Confirm the
model number on the unit and the part number being replaced before ordering.
Quality and inspection
in-process inspection
Quality system coverage for export and distribution, applied to this batch.
New condition
Supplied new, with 12 Months warranty on the delivered item. The injector nozzle assembly is built to model
3126-MUI and packed against that model number.
Specification count
10 specification rows are listed on this page for the injector nozzle assembly, from injector family to shim.
exact part; anything else is marked Not published rather than guessed.
Related search terms
A buyer searching injector nozzle assembly is normally matching a job on the Caterpillar 3114 / 3116 / 3126 engines, and the deciding check is injector family: Caterpillar 3114 / 3116 / 3126 mechanical unit injector. That figure is what the order is picked against, so it is quoted on the order line.
A buyer searching 3126 unit injector nozzle assembly is normally matching a job on the Caterpillar 3114 / 3116 / 3126 engines, and the deciding check is nozzle type: Pintle nozzle assembly. It appears on the specification table above as well, so page and order agree.
A buyer searching diesel nozzle is normally matching a job on the Caterpillar 3114 / 3116 / 3126 engines, and the deciding check is components: Nozzle body, needle, return spring, shim washer. The workshop uses it to confirm the item before it leaves the shelf.
A buyer searching injector nozzle is normally matching a job on the Caterpillar 3114 / 3116 / 3126 engines, and the deciding check is nozzle holes: 5 x 0.22 mm (published family specification). It is the value the test bench has to reproduce before the part is released.
A buyer searching fuel injector nozzle is normally matching a job on the Caterpillar 3114 / 3116 / 3126 engines, and the deciding check is spray cone angle: 127 degrees (published family specification). Where the value is not published for this item, the table above says so rather than guessing.
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A buyer searching fuel injector nozzles is normally matching a job on the Caterpillar 3114 / 3116 / 3126 engines, and the deciding check is body material: Carburised and quenched alloy steel. It separates this build from the neighbouring variants in the same family.
A buyer searching oil burner nozzle assembly is normally matching a job on the Caterpillar 3114 / 3116 / 3126 engines, and the deciding check is return spring: Chrome-vanadium alloy spring steel. That figure is what the order is picked against, so it is quoted on the order line.
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A buyer searching injector nozzle assembly for caterpillar 322b excavator is normally matching a job on the Caterpillar 3114 / 3116 / 3126 engines, and the deciding check is nozzle holes: 5 x 0.22 mm (published family specification). It separates this build from the neighbouring variants in the same family.
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A buyer searching injector nozzle assembly for caterpillar 950f wheel loader is normally matching a job on the Caterpillar 3114 / 3116 / 3126 engines, and the deciding check is needle lift: 0.30 mm (published family specification). The workshop uses it to confirm the item before it leaves the shelf.
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A buyer searching 3126-mui injector nozzle assembly is normally matching a job on the Caterpillar 3114 / 3116 / 3126 engines, and the deciding check is body material: Carburised and quenched alloy steel. It appears on the specification table above as well, so page and order agree.
The search terms above are the type term and its model-qualified form,
collected from the specification table published on this page; each one maps to a
model-number-matched line on the order.
Wholesale and B2B supply
3126-family unit injector nozzle assemblies for construction machinery workshops, diesel fuel injection specialists and fleet rebuild programmes.
- Minimum order: 1 piece
- Container and consolidated shipment quotes
- Neutral or Vidishi Auto branding options
- Model-number matched picking and packing lists
Request a quote
Send the model number, quantity and destination for a delivered total. Model
3126-MUI, MOQ 1 piece, 12 Months warranty – wholesale, container and
consolidated pricing on request.
Pricing is quoted per order. This page carries no published tariff.
Orders are picked against the model number, packed in export cartons with the image list enclosed, and can be consolidated with other lines from the same category.
Lead time is quoted with the order against the destination and the
quantity, and is confirmed before production starts.
Choosing between options
| Nozzle assembly only | renews the nozzle end and leaves a serviceable body in service |
|---|---|
| Complete unit injector | more expensive, and not needed when only the nozzle is worn |
| Remanufactured injector | a different price and warranty basis, and requires a core back |
For a unit injector the deciding question is the set opening pressure, because that is what the test stand has to reproduce.
This comparison describes product categories, not brands. It is a
selection aid, not a performance claim.
Image set
4 images are published for this item, distributed across the modules
above. Every frame is photographed from this product.
Frame by frame: Nozzle body and shim washer, first angle; Same body turned to show the pin; Assembly broken out into its four parts; Spring, pin, body and shim in a row.
The same file names appear in the image list issued with the order.
Frequently asked questions
Is this a genuine Caterpillar product?
No. It is a compatible replacement supplied under the Vidishi Auto brand to the specification published on this page. It is not a genuine Caterpillar product and is not affiliated with Caterpillar. It is not a Caterpillar-branded product. Where a reference part number appears it identifies the equipment being replaced, not an original-equipment product, and no affiliation with Caterpillar is claimed.
What does model 3126-MUI cover?
10 specification rows are published for it, from injector family to shim. The delivered material is Hardened alloy steel nozzle body and needle, chrome-vanadium return spring and the stated warranty is 12 Months.
How do I confirm this fits before ordering?
Read the model number or the part number stamped on the unit being replaced and compare it with the reference numbers on this page. Nozzle side of the Caterpillar 3114 / 3116 / 3126 mechanical unit injector, as used in 320B / 322B / 325B excavators, 924F / 950F wheel loaders, AP-1000 pavers, D5M / D6M tractors and CS-563 compactors. The nozzle assemblies in this family carry different part numbers (127-8216 / 0R-8682, 127-8222 / 0R-8461, 127-8213 / 0R-8473, 127-8218 / 0R-8684, 127-8225 / 0R-8469), so read the number stamped on the injector being rebuilt before ordering.
Do you supply this in wholesale quantities?
Yes. The minimum order is 1 piece, and container and consolidated shipment quotes are available on request.
What warranty applies?
The supplied item carries a 12 Months warranty. Warranty terms are published on the site warranty page.
Which images on this page are of this product?
All of them. Every frame on this page shows this exact item.
What is the lead time on this item?
Lead time is quoted per order against the model number, the quantity and the destination, and it is confirmed on the order acknowledgement before production starts. Consolidated shipments follow the same confirmation.
What happens if it does not fit?
Returns are handled under the site returns policy. Fitment is confirmed by the model number and the number stamped on the unit being replaced before dispatch, which is what keeps a wrong-part return from happening in the first place.
Is a public price shown here?
No. Pricing is quoted per order against model number, quantity and destination. Send those three details and a delivered total comes back.
Support and ordering information
Need this part matched?
Send the model number or the part number stamped on the unit you are replacing, and
we return the matched item with a delivered quotation. Technical answers always
match the specification shown above, so what we quote and what you read here never
disagree.
Fitment is confirmed by model number and stamped part number.
Application lists are a guide, not a guarantee of fit.
Order checklist
- Model number: 3126-MUI
- Reference part number: VDS-3126-INJ-NOZZLE
- Minimum order: 1 piece
- Warranty: 12 Months
- Brand: Vidishi Auto
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