Reverse Engineering and Reproduction of Obsolete Diesel Engine Parts

Custom Replacement Parts for Legacy Marine, Industrial and Power-Generation Engines

Many older diesel engines remain essential to vessels, power stations, industrial installations, emergency generators and specialist machinery long after the original manufacturer has discontinued spare-parts support.

In many cases, the engine itself remains fundamentally serviceable. The problem is a single worn, damaged or unavailable component that can no longer be purchased as a standard replacement part.

Einspritzpumpen Manufaktur NRW provides reverse engineering, technical reconstruction and custom manufacturing of obsolete diesel engine and fuel injection system components.

We support international customers operating legacy engines for which:

original spare parts have been discontinued
the OEM no longer supports the engine series
the original manufacturer no longer exists
technical drawings are incomplete or unavailable
only used or New Old Stock parts remain
commercially available replacement parts do not meet the required specification
or an entire engine installation is at risk because of one unavailable component

Our objective is not merely to reproduce the visible shape of an old part.

We reconstruct its technical function, assess its operating loads, define suitable materials and manufacturing processes and develop a replacement component that is compatible with the existing engine or injection system.

Where technically appropriate, we also improve the original design to achieve greater durability, wear resistance and long-term operational reliability.

Based in North Rhine-Westphalia, Germany – supporting engine operators, shipping companies, power-generation businesses and specialist workshops worldwide.

Do You Need a Part That Is No Longer Available?

Send us the original part number, photographs, engine information and any available technical documentation.

Request an Obsolete Parts Assessment

When Standard Spare Parts Are No Longer Available

Legacy diesel engines are frequently expected to operate for several decades.

Spare-parts supply, however, often ends long before the technical service life of the engine or installation has been reached.

This situation is common in:

marine propulsion engines
marine auxiliary engines
stationary power-generation engines
emergency generator sets
industrial diesel engines
pump and compressor drives
railway engines
mining equipment
military and special-purpose vehicles
historical commercial vehicles
agricultural and construction machinery
and other long-life mechanical installations

A complete engine, vessel or industrial plant may become unavailable because of one component that is no longer supplied by the original manufacturer.

Typical problems include:

discontinued injection-pump components
unavailable plunger-and-barrel assemblies
obsolete delivery-valve components
worn camshaft and tappet parts
damaged housings, bushes or shafts
unavailable drive components
missing control-system parts
obsolete seals or special gaskets
discontinued engine hardware
and components for which no modern equivalent exists

Reverse engineering can make it possible to reconstruct and manufacture these parts again.

Support for Legacy Diesel Engines Worldwide

Our reverse-engineering services are intended for customers who cannot simply replace the complete engine or machine.

This may be because:

the engine is an integral part of a vessel or industrial installation
replacement would require extensive structural modifications
no modern engine offers the same installation dimensions
the original engine is required for regulatory or historical reasons
the complete installation has been designed around the existing engine
a replacement engine would require changes to cooling, exhaust, control or transmission systems
or continued operation is more economical than replacing the complete installation

For these customers, an individual obsolete component can have strategic importance.

Our task is to determine whether this component can be:

identified
reconstructed
improved
manufactured
tested
and safely reintegrated into the existing system

Reverse Engineering for Fuel Injection Systems

Mechanical fuel injection systems are a central area of our work.

We reconstruct and develop components for historical mechanical injection pumps and related fuel-delivery systems, including selected applications involving:

Bosch inline fuel injection pumps
Bosch P9 injection pumps
Bosch P10 injection pumps
L’Orange fuel injection systems
MWM and Deutz large diesel engines
MTU engine applications
MAN industrial and marine engines
Cummins mechanical injection systems
Wärtsilä engine applications
historical Mercedes-Benz diesel engines
and other mechanically controlled diesel injection systems

Depending on technical feasibility, relevant components may include:

pump elements
plunger-and-barrel assemblies
delivery-valve components
control sleeves
control-rack components
camshafts
tappet rollers
roller tappets
bushes
shafts
actuating levers
drive components
plug-in pump components
springs
sealing components
housings
flanges
and pump-specific special parts

Every component is assessed individually.

Not every part can or should be reproduced. Its function, material, dimensional requirements, loading and testability must first be understood.

Used Original Parts and New Old Stock as Technical References

Used Original Components

Used original parts can provide essential information about:

installation dimensions
functional geometry
contact surfaces
lubrication points
mounting arrangements
component interaction
original manufacturing methods
and typical wear zones

A worn or damaged component can still be a valuable reference.

However, wear, corrosion and deformation must not be mistaken for original design dimensions. The original geometry must be reconstructed from the remaining surfaces, mating parts, comparison samples and available documentation.

New Old Stock Parts

New Old Stock, commonly referred to as NOS, consists of unused original components from historical inventory.

NOS parts are particularly valuable as reference samples because they may retain:

original dimensions
original machining marks
unworn functional surfaces
original coatings
original fits
and historical manufacturing details

Long-term storage does not automatically mean that a NOS part is fit for installation.

NOS components may also be affected by:

corrosion
degraded coatings
aged elastomers
contamination
improper storage
or undocumented production differences

They are therefore inspected before being used as a reference or installed in an engine.

Multiple Reference Components

Where possible, we compare more than one original part.

This helps us distinguish between:

original design geometry
permitted manufacturing variation
later OEM modifications
normal operational wear
previous repairs
and incorrect aftermarket reproductions

The reliability of the reconstructed design increases with the quality and quantity of verified reference data.

Cooperation with Original Manufacturers

Where the original manufacturer or a legal successor still exists, we seek to incorporate available OEM knowledge into the project.

Depending on the manufacturer and documentation available, this may include:

historical manufacturing drawings
material specifications
design revisions
heat-treatment requirements
surface specifications
tolerance information
quality-control requirements
installation instructions
and information about known operational weaknesses

Cooperation with the original manufacturer can help clarify historical production changes and reduce uncertainty during reconstruction.

However, many legacy engine manufacturers no longer exist, no longer support the relevant product series or no longer hold complete technical records.

In such cases, the component must be reconstructed from physical evidence, technical function, mating parts and available historical documentation.

When the Original Manufacturer No Longer Exists

The disappearance of the original manufacturer does not automatically mean that a component can no longer be produced.

Where no OEM support is available, we use:

original used components
New Old Stock samples
complete assemblies
mating components
historical parts catalogues
service manuals
dimensional measurements
material analysis
operating data
failure evidence
and our network of specialist manufacturers

The reconstruction process is based on both geometry and function.

A component must not only fit physically. It must also provide the required:

strength
stiffness
wear resistance
sealing performance
movement
load transfer
thermal stability
corrosion resistance
and compatibility with the surrounding assembly

International Manufacturing Network

Depending on the component, we work with specialised manufacturers and production companies in different technical disciplines.

Available manufacturing processes may include:

CNC turning
CNC milling
cylindrical grinding
surface grinding
honing
lapping
electrical discharge machining
precision drilling
gear manufacturing
spline production
broaching
spring manufacturing
toolmaking
casting
forging
welding
brazing
heat treatment
hardening
nitriding
surface coating
material testing
and small-series precision production

The manufacturing method is selected according to the component’s function and required properties.

Relevant factors include:

material
geometry
tolerances
surface finish
loading
required production quantity
quality-control requirements
and economic feasibility

Our Reverse-Engineering Process

1. Technical Project Assessment

Every project begins with a technical assessment.

We identify:

the component
the original manufacturer
the original part number
the engine or injection-pump type
the installation position
the operating function
the known failure
the required quantity
the available reference parts
and the operational importance of the component

At this stage, we also determine whether a suitable original or alternative component may already exist.

Reverse engineering is used where standard replacement solutions are no longer available or technically unsuitable.

2. Collection of Reference Parts and Documentation

We collect and evaluate all available technical evidence, including:

used original components
damaged components
broken fragments
NOS parts
complete assemblies
mating parts
historical drawings
spare-parts catalogues
service manuals
manufacturer data
and previous repair documentation

All identification markings and relevant component conditions are documented.

3. Controlled Dismantling

Where the component forms part of a larger assembly, the assembly is dismantled in a controlled manner.

This allows us to examine:

installation sequence
load paths
contact surfaces
lubrication
bearing arrangements
sealing points
clearances
spring forces
and interaction with adjacent components

The functional relationship between components is often as important as the dimensions of the individual part.

4. Dimensional Inspection

The original or reference component is measured using suitable inspection methods.

Depending on geometry and required accuracy, this may include:

external dimensions
internal diameters
bores
angles
radii
threads
fits
surface geometry
concentricity
flatness
form deviation
component alignment
and functional distances

Worn dimensions are not simply copied.

The original geometry is reconstructed using remaining unworn areas, mating parts, comparison components and technical calculations.

5. Material and Load Assessment

A replacement component must be manufactured from a material suitable for its actual operating conditions.

Depending on the application, we assess:

tensile loading
compression
bending
torsion
impact loading
cyclic fatigue
contact pressure
sliding wear
abrasive wear
cavitation
thermal loading
fuel exposure
lubricating-oil exposure
corrosion
and long-term mechanical stress

Where necessary, material selection is combined with suitable:

heat treatment
hardening
surface coating
nitriding
grinding
honing
or polishing processes

6. CAD Reconstruction and Manufacturing Documentation

The verified data are converted into reproducible technical documentation.

Depending on the project, this may include:

CAD models
technical drawings
dimensional specifications
tolerances
fits
material requirements
heat-treatment specifications
surface-finish requirements
machining instructions
quality-control features
and assembly information

We distinguish clearly between:

confirmed original dimensions
reconstructed dimensions
assumed design features
and deliberate technical improvements

7. Engineering Improvement

Our aim is not always to produce an unchanged copy of an old component.

Historical parts were designed using the materials, manufacturing methods and cost requirements available at the time.

Where a known weakness exists, we assess whether the component can be improved through:

more suitable material selection
improved heat treatment
greater wear resistance
optimised surface finish
improved corrosion protection
modified radii
improved load distribution
stronger critical sections
better lubrication
more stable fits
or a more reproducible manufacturing process

Any modification must remain compatible with the original engine or pump assembly.

A stronger individual component is not automatically a better component if it transfers excessive load to another part of the system.

For this reason, every improvement is assessed within the context of the complete assembly.

8. Prototype or First-Article Production

Where appropriate, a prototype or first production sample is manufactured before final series production.

The first article is inspected for:

dimensional accuracy
fit
assembly
clearances
surface quality
movement
alignment
and functional interaction with original components

Required changes are incorporated into the final production documentation.

9. Functional Testing

The required test procedure depends on the component.

Testing may include:

dimensional inspection
fit verification
assembly testing
movement testing
leakage testing
pressure testing
hardness testing
surface inspection
material verification
operating-load testing
or testing within the complete assembly

For fuel injection pump components, the final evaluation should take place within the fully assembled injection pump wherever technically possible.

The completed pump can then be checked for:

mechanical operation
fuel delivery
leakage
repeatability
uniformity between pump sections
and calibration on the appropriate test bench

10. Individual Production and Small Series

After successful validation, suitable components can be manufactured as:

individual replacement parts
prototypes
first articles
complete engine sets
small production series
or stock for future repairs

Production quantity depends on:

component complexity
tooling requirements
manufacturing process
expected future demand
and economic feasibility

Engineering for Long Service Life

Our objective is to develop replacement components that provide reliable operation over the longest technically reasonable service life.

Durability depends not only on the basic material.

It also depends on:

component design
manufacturing accuracy
surface condition
heat treatment
lubrication
operating clearances
installation quality
alignment
load distribution
maintenance
fuel quality
oil quality
and actual engine operating conditions

For this reason, we do not evaluate a component in isolation.

A change to one injection-pump component may influence:

fuel delivery
control movement
sealing
friction
camshaft loading
tappet loading
lubrication
wear
and final test-bench calibration

Long service life can only be achieved when these relationships are understood.

Full Specified Performance

The objective of every replacement component is to restore the defined technical performance of the original assembly.

Depending on the application, this requires:

correct geometry
correct fits
reliable load transmission
defined movement
sufficient wear resistance
suitable material properties
reliable sealing
reproducible manufacturing quality
and verified operation within the complete system

We therefore avoid making performance claims based solely on the appearance or dimensions of an individual part.

The relevant standard is the function of the completed engine, injection pump or assembly.

For injection-pump components, final verification is performed through mechanical testing and test-bench calibration wherever possible.

Typical Components We Can Assess

Depending on technical feasibility, we assess components including:

Fuel Injection Pump Components

pump housings
plunger-and-barrel assemblies
pump elements
delivery-valve components
camshafts
cam followers
rollers
tappets
bushes
shafts
control-rack components
control sleeves
governor components
actuating levers
springs
drive components
flanges
connection parts
plug-in pump components
and pump-specific special parts

Diesel Engine Components

bushes
shafts
bearing and guide components
levers
flanges
brackets
valve-train components
pistons and piston-related components
connecting-rod components
adapters
drive components
housing parts
and special installation hardware

Marine and Large-Engine Components

parts for Bosch P9 and P10 injection pumps
components for historical L’Orange systems
MWM and Deutz large-engine parts
injection-pump drive components
plug-in pump components
roller and bearing components
fuel-system components
and application-specific mechanical parts

Every request is subject to an individual technical assessment.

Industries and Customers We Support

Our international reverse-engineering services are intended for:

shipping companies
vessel operators
shipyards
marine-engine service companies
power stations
generator operators
industrial engine operators
mining companies
railway maintenance organisations
engine rebuilders
fuel injection specialists
diesel service companies
machinery operators
technical engineering companies
spare-parts suppliers
and owners of historically significant engines

We understand that downtime in these applications may result in:

vessel unavailability
production interruption
loss of emergency power capability
contract delays
high replacement costs
or the permanent loss of an otherwise serviceable machine

For this reason, technically viable obsolete-parts projects are assessed with particular attention to operational relevance and future availability.

International Project Handling

Customers outside Germany can submit technical requests before shipping any components.

The initial assessment can normally begin with:

high-resolution photographs
original part numbers
engine and pump identification
available drawings
dimensions
spare-parts catalogue pages
damage descriptions
required quantity
and information about the installation

Where the project appears technically feasible, the original component or complete assembly can be sent to our workshop by prior arrangement.

For international shipments, components should be:

drained of fuel and oil
cleaned only externally
protected against corrosion
packaged securely
clearly identified
and accompanied by the relevant customs and shipping documentation

Do not grind, polish, blast or modify the original component before assessment.

Even damaged surfaces, deposits and fracture areas may provide important information about the original geometry and cause of failure.

Information Required for an Initial Assessment

Please provide as much of the following information as possible:

original manufacturer
original part number
engine manufacturer
complete engine designation
injection-pump manufacturer and type
component description
installation position
operating application
required quantity
photographs of the complete component
photographs of all markings
photographs of the complete assembly
known dimensions
available technical drawings
spare-parts catalogue pages
description of the damage
information about previous repairs
operating hours, where known
and the consequences of component failure

If multiple original parts are available, please photograph and identify each one separately.

Frequently Asked Questions

Can you reproduce any obsolete engine component?

No. Every component must be assessed individually.

Technical feasibility depends on:

component function
geometry
material
manufacturing process
operating load
required accuracy
available reference samples
required quantity
and the ability to verify the completed part

Can a worn component be used as a reference?

Yes, in many cases.

A worn part can still provide valuable information about its design and function. However, the worn surfaces must be reconstructed rather than copied directly.

Mating parts, comparison samples and technical documentation may also be required.

Can a broken component be reconstructed?

Potentially, yes.

Broken fragments can provide information about:

original geometry
wall thickness
material behaviour
fracture origin
loading
and failure mechanism

The feasibility depends on how much of the original part and surrounding assembly remains available.

Can you obtain New Old Stock components?

We search for suitable used and New Old Stock reference parts where these are required for a project.

Availability cannot be guaranteed, particularly for rare or very old engine series.

Do you work with the original manufacturer?

Where the original manufacturer or a successor still exists and cooperation is possible, we seek to incorporate available OEM information into the reconstruction process.

What happens when the original manufacturer no longer exists?

We reconstruct the component using physical reference parts, mating components, historical documentation, functional analysis and our network of specialised manufacturers.

Do you simply copy the original part?

No.

We first determine the original geometry and technical function. We then assess whether material, surface treatment or design details can be improved without compromising compatibility with the existing assembly.

Can you manufacture only one part?

Depending on the component and manufacturing process, individual parts, prototypes and small production series may be possible.

Some manufacturing methods require a minimum economical quantity.

Can you improve the durability of the original component?

Where technically appropriate, we can assess improvements involving:

material selection
heat treatment
wear resistance
surface quality
corrosion protection
lubrication
geometry
and load distribution

Every modification must remain compatible with the complete system.

How is the new component tested?

The test procedure depends on its function.

For injection-pump components, final assessment can include installation in the complete pump followed by mechanical testing and calibration on a suitable test bench.

Can international customers send components to Germany?

Yes, by prior arrangement.

Please send photographs and technical details before shipping any parts.

Request an Obsolete Parts Assessment

Is your engine, vessel or industrial installation out of service because a replacement component is no longer available?

Send us:

the original part number
engine or pump identification
photographs
available drawings
the required quantity
and a description of the technical problem

We will assess:

whether suitable original stock may still exist
whether a used or NOS reference part is required
whether the component can be reconstructed
which manufacturing process may be suitable
what testing will be required
whether technical improvements are possible
and whether the project is economically viable

A binding quotation normally requires inspection of the original component or complete assembly.

Contact Our Reverse-Engineering Department

Name *

Company

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Email Address *

Telephone Number

Engine Manufacturer and Model

Original Part Number

Required Quantity

Description of the Component and Failure *

Upload Photographs and Technical Documents

Submit Technical Enquiry

Einspritzpumpen Manufaktur NRW

Reverse Engineering for Obsolete Diesel Engine and Injection-System Parts

Our services include:

sourcing used original components
sourcing New Old Stock reference parts
dismantling historical assemblies
dimensional inspection
functional analysis
cooperation with original manufacturers
CAD reconstruction
preparation of manufacturing drawings
material and load assessment
technical improvement of historical designs
prototype production
individual manufacturing
small-series production
quality inspection
assembly testing
and functional verification on the complete system

Obsolete Does Not Automatically Mean Irreparable

We develop technical solutions for engines and injection systems that remain essential long after standard spare-parts support has ended.

Request a Reverse-Engineering Assessment

Bosch P9 Fuel Injection Pump Repair and Overhaul
Bosch P10 Fuel Injection Pump Repair and Overhaul
L’Orange Injection Pump Repair
Medium and Large Diesel Fuel Injection Systems
Diesel Engine Rebuilding
Contact Our Specialist Workshop