Buying guide
How We Test and Pack Before Shipment
Named test benches, photographed checks and factory-standard export packing — what happens to your order before the box is sealed.
The short answer
Every order we ship crosses four checkpoints before the carton is taped. The unit is logged by the number stamped on it, run on a named test bench, inspected at the sealing surfaces and threads, then photographed as it is packed. The photos go out with the shipment. A test report for the batch is available if you ask for it when you order.
None of that is dramatic. It is the part of the purchase you never see, which is why it gets a page. What follows is the equipment, the sequence and the packing data, in the same terms we would use on a call: which bench, which checks, which carton, which weight.
Why we name the bench instead of printing a slogan
The phrase '100% tested' sits on half the listings you will compare us against. We do not print it. Not because testing is optional, but because the phrase carries no information. Tested how? At which pressure, at which points, on which bench, against which limit? A supplier can earn those three words after a ten-second bench run or after a full delivery curve. The buyer reads the same sentence either way.
Equipment names are harder to fake and easier to check. The Hartridge Toledo HEUI Master is a specific machine built for one job: HEUI injectors, actuated by oil pressure, tested at working conditions. The Bosch EPS815 is a common-rail bench. When we say a part number ran on one of them, you can ask for the photo, the date and the report behind it. When a listing says '100% tested' there is nothing to ask for, and that is the point of the phrase.
Naming the bench also forces us to be honest about what a bench cannot do. A run confirms that a unit delivers the flow and pressure it should at the test points. It does not confirm that your oil is clean, your harness is sound, or that the installer seated the unit correctly. Those three are the usual reasons a tested injector disappoints an owner, and none of them happen on our floor.
The three benches on our floor
Three benches cover the catalog. Each line has a defined route, and the route is decided by the stamped number, not by the order line or by what the buyer called the part in a message.
| Product line | Bench | What the run checks |
|---|---|---|
| C7, C9, C-9 and 3126 HEUI injectors | Hartridge Toledo HEUI Master | Injection and return flow at working conditions, solenoid response, seal condition |
| Common-rail injectors (C9.3, C7.1, 320D) | Bosch EPS815 | Delivery at rated and idle points, back-leak, spray pattern |
| HEUI actuator pumps | Hartridge bench | Oil-side delivery and pressure, leakage |
| Common-rail pumps | Bosch EPS815 | Rail-pressure delivery, sealing |
| Repair kits | Contents check at the packing table | Kit contents against the parts list, packaging |
Why a HEUI injector cannot run on a common-rail bench
The two systems make pressure in different places. A common-rail injector receives fuel that the pump has already pressurized in the rail, and its job is to release a measured amount at the right moment. A HEUI injector makes its own injection pressure inside the body, using engine oil to drive an intensifier piston that multiplies the oil pressure into fuel pressure. Feed a HEUI unit from a rail and you have no oil circuit to actuate it. The bench would report nothing useful, so the operator would improvise, and improvisation is how a test becomes a formality.
Dedicated equipment exists because the test is different, not because the machine is expensive. You can hear the difference in the questions a supplier asks. A shop that tests HEUI units asks about oil-side behavior and solenoid response. A shop that repackages common-rail parts talks about flow only.
What a bench run does not prove
- It does not prove the unit will survive contaminated oil. HEUI systems fail quickly on dirty oil, which is why the exclusion appears in every warranty document in this trade, ours included.
- It does not prove the harness, the connector or the ECM is good. An injector can pass and still not fire in a truck with a broken circuit.
- It does not replace the installation sheet: seating depth, seal lubrication and hold-down torque decide whether a good unit runs well.
What the run does is remove the unit itself from the list of suspects before it leaves the building. That is a narrower promise than a slogan, and a far more useful one when the machine is down and the customer is calling twice a day.
From your payment to the sealed carton
The path is fixed. Order value does not change it, and neither does the part. A single injector and a pallet of pumps go through the same four steps, at different speeds.
| Step | What happens | What you can ask for |
|---|---|---|
| 1 - Identify | The unit is pulled against the order line, then logged by the stamped part number. If the stamping and the order line disagree, the line stops here. | Confirmation of the number we read |
| 2 - Bench test | The unit runs on the bench assigned to its family, against the check points for that line. | A batch test report, requested at ordering |
| 3 - Inspect | Sealing surfaces, threads, connections and the solenoid connector are checked. Seals on opened units are replaced. | A note on anything we replaced |
| 4 - Photograph and pack | Your actual goods are photographed before the carton is sealed, then packed to the export standard for the line. | The photo set for your shipment |
Step one sounds trivial. It is the step that catches most problems. A C7 engine can carry two different injector numbers across its cylinders, so a buyer who orders six of one number from the engine name alone is already one step away from a mixed set. Reading the stamping catches that before the bench rather than after the invoice.
Step three is where the arguments are avoided later. Threads that have been cross-threaded by a previous installer, a connector with a cracked housing, a sealing face with a nick: all of it is visible before packing and none of it is visible in a bench curve. A unit that fails inspection is not packed with a note saying it is probably fine.
A unit that fails its check points does not get a second run until someone understands why it failed. It goes back to the queue with a note, not into the carton with a shrug. We do not publish a pass rate. A rate tells you nothing about your six pieces, and a supplier who prints one is usually competing on the number rather than the method.
What the batch report actually contains
A test report is written per batch, not per unit. It carries the batch reference, the part numbers in the batch, the bench used, the check points applied and the date. It is a record of what ran, on which machine, signed by the person who ran it. That is the whole document. There is no score, no grade and no certificate styling.
Ask for it at ordering rather than after arrival. The report is compiled from the bench log for that batch, so requesting it up front means it is packed with the invoice and the packing list instead of being chased across time zones a month later. Ask once, on the PO, in writing.
What we do not do is publish sample reports with other customers' names and batch data on this site. A redacted sample proves nothing, and an unredacted one is not ours to publish. If you want to see the format before you commit to an order, ask and we will walk you through the fields one by one.
The benches, the room and the check lists are photographed on the quality and testing page. That page is the evidence for the equipment; this one is the evidence for the sequence.
One limit worth stating plainly: a report is not a warranty certificate. It records a bench result on a date. Warranty terms are separate, confirmed per order and stated on the quotation, with the exclusions that apply across the industry: contaminated oil or fuel, incorrect installation, and normal wear parts. Details are on the warranty and shipping page.
Packing, with the numbers we actually use
Packing data matters more than most buyers expect, because it drives freight and freight drives the landed cost of a small order. Our standard export pack for C7 and C9 HEUI injectors is six pieces per carton, 10.8 kg gross, 350 x 280 x 400 mm. Those numbers are on the quotation, not just on this page.
| Line | Pieces per box | Box weight | Box size |
|---|---|---|---|
| C7 / C9 HEUI injectors | 6 | 10.8 kg | 350 x 280 x 400 mm |
| 3126 injectors | 6 | 11.4 kg | Factory export carton |
| C-9 injector 188-8739 | 6 | 10.2 kg | Factory export carton |
| Actuator pump 319-0675 | 1 | 11 kg (unit 10.28 kg) | 300 x 300 x 200 mm |
| Pump 476-8769 | 1 | 14 kg (unit 12 kg) | Factory export carton |
Read the chart with the piece count in mind. The heaviest carton in the list holds one pump, not six injectors. The lightest holds six of the smaller C-9 units. A buyer comparing cartons by weight alone will misjudge the box every time, which is why the pieces column sits next to the kilos.
For a mixed order, ask for the carton list before you book freight. Ten boxes of C7 injectors is 60 pieces, about 108 kg and roughly 0.39 cubic meters. That is a small pallet and a routine air booking, and knowing it before the forwarder asks saves a day of messages. The same arithmetic on a pump line looks very different: eight pumps in individual cartons weigh about as much as eighteen boxes of injectors and take a fifth of the space.
Two details in the pack are worth asking any supplier about, including us. First, whether the carton is the factory export carton or a repack. A repack is fine when the inner protection is right and a problem when the units are loose in a box with a sheet of paper. Second, whether the carton is photographed before sealing. A photo of your six units with the numbers legible is the cheapest insurance in the trade: it costs nothing at dispatch and settles most arguments at arrival.
Single injectors ship from one piece on most lines, in a smaller carton. The six-piece pack is the factory pack for those injector lines, not a minimum on everything. MOQ is per line and confirmed on the quotation, and private label packing is available on qualifying volumes, agreed in writing per program, with the packaging time added to the schedule. Program terms are set out on the wholesale page.
What the certificates on the wall do and do not mean
Buyers ask about the framed documents in the office, usually after a video call. Eight of them hang in Humen:
- Bosch Diesel Center
- Bosch common-rail component repair authorization
- Bosch diesel service assessment 2024, rated Excellent (Gold)
- Delphi Advanced Diesel System Diagnostic Center
- Delphi Outstanding Diesel Service Station 2021-2022 plaque
- Delphi Outstanding Service Station trophy
- Delphi 2024 standing award
- Weifu service authorization
Read them for what they are. They cover service and repair work: diagnosis, repair and remanufacturing of fuel-system components, assessed by the equipment makers whose systems the workshop handles every day. They are not a manufacturing license for any engine or component brand, and they do not make BOSTEN an authorized distributor of Caterpillar, Cummins, Volvo, Detroit Diesel, Weichai or Bosch. We are an independent aftermarket supplier. Manufacturer names and part numbers appear on this site to identify and cross-reference parts, and for no other reason.
That distinction protects you as much as it protects us. A shop that buys on the belief it is receiving a dealer part pays dealer expectations and gets an aftermarket unit, then measures every small difference as a defect. We would rather state the position plainly and let the test, the packing and the warranty terms carry the order.
The service work itself happens in China. For overseas buyers the relationship is parts supply: we test, pack and ship. No repair service is offered outside China, and no buyer should plan a warranty claim around sending a unit back for bench work.
What to ask any supplier, including us
The list below works on any supplier in this trade. Run it on us before you run it on the next quote.
- Which bench will this exact part number run on?
- What check points does that bench apply, in the order they are run?
- Can the batch test report ship with the goods?
- Will the carton be photographed before it is sealed?
- How many pieces per box, and what is the gross weight?
- Is this part number new or remanufactured, and does a core return apply?
- What does the quotation say about warranty, and what is excluded?
If a supplier answers four of those seven with a number or a document, the price gap between them and the cheapest listing usually stops mattering. If the answers are adjectives, keep looking. Two suppliers can quote the same part number at very different prices and still be describing different goods: one tested on the right bench with a report on file, one tested on whatever was free that afternoon.
Send the stamped number, the engine model and a photo of the plate. We will confirm the version, the bench it will run on and the carton it will ship in before you pay. For the 3126 line, the fitment detail sits on the 3126 and 3126B application page; the ordering route starts at request a quote.
Common questions
Asked before this decision
Do you test every single unit before it ships?
Every unit on an injector or pump line goes through the route for its family: logged by stamped number, run on the assigned bench, inspected, then photographed before packing. We do not print the phrase 100% tested, because the phrase says nothing about which bench or which check points were used. Ask for the check list for your line and compare it with any other supplier's.
Can I get the test report for my order?
Yes, when you ask at ordering. The report is written per batch and carries the batch reference, part numbers, bench used, check points and date, signed by the operator. Ask on the purchase order so it is packed with the invoice and packing list. Requests made weeks after arrival take longer, because the bench log has to be located again.
What are the carton dimensions and weights?
C7 and C9 HEUI injectors ship six pieces per carton at 10.8 kg gross, 350 x 280 x 400 mm. 3126 injectors are six per carton at 11.4 kg, the C-9 injector 188-8739 is six per carton at 10.2 kg, the 319-0675 actuator pump is 11 kg in a 300 x 300 x 200 mm box, and the 476-8769 pump is 14 kg. Ask for the carton list before booking freight on a mixed order.
Are the Bosch and Delphi certificates a manufacturing license?
No. The eight documents on site cover service and repair work: Bosch Diesel Center status, a Bosch common-rail component repair authorization, a Bosch diesel service assessment rated Excellent in 2024, three Delphi service awards with a diagnostic center authorization, and a Weifu service authorization. None of them is a parts manufacturing license, and BOSTEN is not an authorized distributor for Caterpillar, Cummins, Volvo, Detroit Diesel, Weichai or Bosch.
What happens if a unit fails the bench?
It comes off the shipment and goes back to the queue with a note. Nothing is packed as close enough. We do not publish a pass rate, because a rate says nothing about the specific pieces on your order. If a whole batch looks wrong, you hear it from us before dispatch, with the option to wait or to change the order.