Do You Really Need a New Test Bench to Test Common Rail Pumps?

You've been told you need a new test bench

You want to test Common Rail pumps.

The obvious next step seems to be buying a Common Rail test bench.

But is it really necessary?

If your workshop already has an ISO 4008-compliant diesel injection pump test bench, much of the mechanical infrastructure required to test Common Rail pumps may already be standing on your workshop floor.

Your existing test bench can already do something fundamental:

drive the pump accurately and under controlled conditions.

What it does not necessarily have is everything required to control, pressurize, measure and evaluate a Common Rail pump.

That distinction changes the question.

Instead of asking:

Which new Common Rail test bench should I buy?

ask:

What do I need to add to the test bench I already have?

What does your existing test bench already give you?

A conventional ISO 4008 test bench provides the mechanical foundation for pump testing.

It drives the pump at a controlled rotational speed and provides the physical environment required to install and operate it.

That is a significant part of the job — and often a significant part of the investment already made by the workshop.

Common Rail does not make that mechanical capability suddenly worthless.

What changes is what has to happen around the pump.

A Common Rail pump has to be electronically controlled.

High pressure has to be generated and regulated under controlled conditions.

Fuel delivery has to be measured.

The high-pressure circuit has to reproduce the conditions required for testing.

And different pump families require their own connections, interfaces and application-specific equipment.

So the architecture becomes quite simple to understand:

ISO 4008 test bench

• electronic control
• high-pressure test accumulator
• flow measurement
• application-specific equipment
  = Common Rail pump testing capability

The test bench has not been replaced.

Its capability has been extended.

What is actually missing for Common Rail pump testing?

The exact configuration depends on the pump applications you want to test, but the additional functions can be separated into a few clear areas.

Electronic control

Modern Common Rail pumps use electrically controlled pressure and flow-regulating devices.

These components have to be driven correctly while the pump is running, and their behaviour has to be coordinated with the pressure generated in the test circuit.

This requires an electronic control system specifically designed for diesel pump testing.

High-pressure circuit

The pump needs to operate against a controlled high-pressure environment.

A suitable test accumulator provides the high-pressure volume and pressure measurement required to reproduce and monitor operating conditions during testing.

Flow measurement

Pressure alone does not tell the complete story.

Pump delivery has to be measured under the relevant operating conditions.

A flowmeter therefore becomes part of the testing system, allowing the operator to evaluate pump output while pressure and operating conditions are controlled.

Application equipment

The pump must also be mechanically and hydraulically connected to the test system.

Depending on the application, this can include couplings, flanges, high-pressure connections, feed circuits and other application-specific equipment.

These components change from one pump family to another.

The underlying testing architecture does not necessarily have to.

This is where ERT45R enters the system

The role of ERT45R is to add the electronic control capability required by the pump.

A simple way to understand the relationship is:

Your test bench drives the pump.

ERT45R controls it.

But ERT45R was not conceived simply as a control box dedicated to one Common Rail pump family.

It is a programmable technology developed to support different electronically controlled diesel pump applications.

This is an important distinction.

If the objective were simply to test one pump family, a dedicated controller could solve one problem.

But a professional diesel workshop rarely stops with one application.

Today the requirement may be a Bosch Common Rail pump.

Tomorrow it may be Denso.

Another customer may bring a Delphi application.

And beyond Common Rail, electronically controlled rotary or distributor pump technologies may also be commercially relevant to the same workshop.

A platform approach changes the investment logic.

One platform, different pump capabilities

With ERT45R, the control unit becomes a common technological foundation.

Different supported pump applications can then be enabled through the appropriate programming and application equipment.

This means that the workshop does not necessarily have to start again every time another pump technology becomes relevant.

The question becomes:

Can the next capability be added to the platform I already have?

That is a very different approach from accumulating independent control boxes or complete test systems for individual pump families.

And it makes progressive investment possible.

A workshop can start with the pump applications that matter most to its current business and extend its coverage when there is a commercial reason to do so.

Bosch EPS815? An excellent foundation — but not a requirement

The Bosch EPS815 is widely used in professional diesel injection workshops and can provide an excellent mechanical foundation for this architecture.

For a workshop that already owns one, replacing it simply because Common Rail capability is required may therefore make little sense.

But ERT45R is not an EPS815 accessory.

The concept is broader.

The mechanical foundation is the ISO 4008-compliant test bench.

ERT45R and the associated Common Rail equipment add the functions required around it.

This is particularly important for independent diesel specialists because existing workshop infrastructure varies enormously around the world.

The relevant starting point is not the badge on the test bench.

It is the capability the bench already provides.

Start with the pumps that create value for your workshop

It is tempting to begin a Common Rail project by making a list of every pump ever produced.

That is rarely the most useful starting point.

A better question is:

Which pumps do you actually need to test?

A workshop servicing European passenger vehicles may have one priority.

A diesel center working with Japanese commercial vehicles may have another.

A mining workshop, marine specialist or heavy-duty operation may have completely different requirements.

The testing architecture should follow the business.

Start with the applications that generate work today or represent a clear opportunity tomorrow.

Then determine the control, hydraulic and mechanical equipment required to cover them.

This avoids buying capability simply because it exists.

Build the capability because your workshop can use it.

Denso HP0 is a good example

The Denso HP0 provides a particularly clear example of this philosophy.

It is a pump application that requires specific control and test equipment, but this does not automatically mean that a workshop has to replace its existing mechanical test bench.

The existing bench continues to provide the mechanical drive.

The additional equipment provides the electronic control, high-pressure circuit, measurement and application-specific functions required for HP0 testing.

The result is not a completely new mechanical infrastructure.

It is a new capability built around infrastructure that was already there.

For workshops specifically interested in this application, we have covered the HP0 configuration separately in our article on testing Denso HP0 pumps on an existing test bench.

And Common Rail does not have to be the end of the story

This is where the difference between buying a device and investing in a technology platform becomes more visible.

ERT45R can support applications beyond Common Rail.

Depending on the required configuration, the same technological foundation can be used for other electronically controlled diesel pump families.

This matters particularly to workshops that work across different generations of diesel technology.

Not every vehicle, engine or machine entering a diesel workshop uses the latest Common Rail system.

Electronically controlled distributor and rotary pump technologies are still part of the operating fleet in many markets and applications.

So an investment initially made to develop Common Rail capability can become the starting point for something broader:

a progressively expandable electronic pump testing capability.

New test bench or extend the one you have?

There are situations where purchasing a new test bench is absolutely the right decision.

A workshop may need additional mechanical capacity.

It may need a second testing station.

Its existing equipment may need replacement for reasons unrelated to Common Rail.

Production volume may justify a dedicated system.

Or the workshop may simply be building a completely new facility.

The point is not that a new test bench is wrong.

The point is that Common Rail capability alone does not automatically make your existing ISO 4008 test bench obsolete.

Before investing in another complete machine, compare the two decisions properly.

Not simply:

old bench versus new bench

but:

What capability do I need, and what is the most effective way to create it?

Sometimes the answer will be a new machine.

Sometimes the answer will already be partly standing in front of you.

Before buying another test bench, map what you already have

If you are considering Common Rail pump testing, start with three pieces of information:

Which test bench do you already have?

Which pumps do you want to test?

Which Common Rail equipment do you already own?

From there, the missing capability can be identified.

Perhaps you need the complete control, measurement and high-pressure configuration.

Perhaps part of the equipment is already available in your workshop.

Perhaps you already own an ERT45R and only need to extend it to another application.

There is little value in buying the same capability twice.

The objective should be to build on what already creates value whenever possible.

Build capability, not simply another machine

A modern diesel injection workshop does not necessarily have to grow by replacing one generation of equipment with another.

Sometimes the better strategy is to preserve the mechanical infrastructure that still does its job and add the technologies required for the next one.

Common Rail pump testing is a good example.

An ISO 4008-compliant test bench, combined with the appropriate electronic control, high-pressure accumulator, flow measurement and application equipment, can become the foundation of a professional Common Rail pump testing system.

And with a programmable technology such as ERT45R, that investment can extend beyond a single pump family.

So before asking which Common Rail test bench you should buy, ask a different question:

What is missing from the test bench I already have?

That answer may lead to a very different investment.

Tell us what you already have

If you want to develop or extend your pump testing capability, tell us:

your test bench model, the pump families you want to test, and the equipment already available in your workshop.

We can start from there.

Because the best solution is not necessarily the one that replaces everything.

It is the one that gives your workshop the capabilities it actually needs.