Bosch P9 Fuel Injection Pump Repair, Overhaul and Calibration

Specialist Workshop for Mechanical Bosch P9 Inline Fuel Injection Pumps

Einspritzpumpen Manufaktur NRW is an independent specialist workshop in Germany providing professional repair, overhaul, testing and calibration of mechanical Bosch P9 inline fuel injection pumps.

Bosch P9 injection pumps are used in high-output marine, industrial, power-generation and stationary diesel engines. Their precise mechanical operation and uniform fuel delivery have a direct influence on engine output, fuel consumption, combustion quality, exhaust-gas temperatures and operational reliability.

A professional Bosch P9 fuel injection pump overhaul involves considerably more than replacing seals or repairing an external fuel leak. It requires complete dismantling, controlled cleaning, dimensional inspection of all functional components, replacement or reproduction of worn parts, precise reassembly and final calibration on a suitable fuel injection pump test bench.

Our workshop is specifically equipped for this work.

Based in North Rhine-Westphalia, Germany – supporting engine operators, industrial companies, marine businesses and specialist workshops throughout Europe and worldwide.

Request a Bosch P9 Pump Assessment

Please send us photographs of the complete injection pump, the nameplate, all visible part numbers and the corresponding engine information.

Contact Our Bosch P9 Specialists

Professional Bosch P9 Fuel Injection Pump Overhaul

Bosch P9 inline injection pumps are heavily loaded precision assemblies designed for large diesel engines.

Every pump section must deliver a precisely defined quantity of fuel under different engine-speed and load conditions. Even comparatively small deviations between individual pump sections can result in unequal combustion conditions across the engine.

Possible consequences include:

uneven engine operation
unequal cylinder output
increased fuel consumption
reduced engine performance
starting problems
excessive exhaust-gas temperature on individual cylinders
smoke formation
fuel leakage
irregular fuel delivery
increased thermal loading
increased mechanical loading
and reduced engine service life

A reliable overhaul therefore requires a systematic inspection of the complete injection pump rather than the replacement of isolated components.

Our Bosch P9 services include:

technical pump identification
incoming inspection and documentation
complete dismantling
multi-stage component cleaning
precision measurement
inspection of all mechanical pump components
assessment of plunger-and-barrel assemblies
camshaft and tappet inspection
bearing and housing inspection
repair or replacement of worn components
reverse engineering of obsolete parts
professional reassembly
mechanical basic adjustment
test-bench operation
fuel-delivery calibration
comparison of all pump sections
leakage testing
and final functional inspection

Each injection pump is evaluated individually according to its Bosch type designation, Bosch part number, engine-manufacturer reference, engine application and technical condition.

Bosch P9 Pump Types

Bosch FA-PE8/9M Inline Injection Pumps

Frequently requested Bosch P9 pump types include:

FA-PE8/9M/160/100/LV
FA-PE8/9M/180/100S24

These examples represent only a limited selection of the Bosch P9 pump versions that may be submitted for technical assessment.

Different P9 pumps may vary in:

number of pump sections
direction of rotation
plunger-and-barrel design
fuel-delivery specification
camshaft design
cam profile
drive arrangement
actuating mechanism
mounting configuration
engine output
rated engine speed
engine application
and technical production status

A Bosch P9 pump cannot therefore be identified reliably by its external appearance alone.

The complete information shown on the nameplate is essential for a binding technical assessment.

Alternative Bosch P9 Type-Number Formats

Historical technical documentation, spare-parts catalogues, databases and online listings frequently use different formatting for the same Bosch pump designation.

The Bosch type designation:

FA-PE8/9M/160/100/LV

may also appear as:

FA PE8/9M/160/100/LV
FA PE8 9M 160 100 LV
FA-PE8-9M-160-100-LV
FAPE89M160100LV

The Bosch designation:

FA-PE8/9M/180/100S24

may also appear as:

FA PE8/9M/180/100S24
FA PE8 9M 180 100 S24
FA-PE8-9M-180-100S24
FAPE89M180100S24

Regardless of how the number is written, we assess whether the relevant Bosch P9 injection pump can be identified, overhauled and calibrated.

A binding identification is always based on the original nameplate, pump construction, associated engine and available technical data.

Bosch P9 Part Numbers

Bosch P9 inline fuel injection pumps may also be identified by their Bosch original part numbers.

Frequently requested Bosch P9 references include:

B 405 980 021
B 405 980 022
B 405 980 023
B 405 980 024

The same numbers may be written without spaces:

B405980021
B405980022
B405980023
B405980024

They may also appear with hyphens:

B-405-980-021
B-405-980-022
B-405-980-023
B-405-980-024

If you are searching for a repair or overhaul of a Bosch B 405 980 024, Bosch B405980024 or another P9 injection pump, please send us the complete identification details before shipping the unit.

The Bosch part number is an important starting point, but it may not be sufficient on its own. The final identification also considers the complete pump designation, engine-manufacturer references, direction of rotation and engine data.

MWM and Deutz Reference Numbers

Bosch P9 fuel injection pumps may additionally be listed under MWM or Deutz original equipment references.

Frequently requested MWM and Deutz numbers associated with these large-engine injection systems include:

12305948
12305950
12306782
12306784
12305942
12305944

Depending on the documentation or search format, these numbers may also be written as:

1230 5948
1230-5948
1230 5950
1230-5950
1230 6782
1230-6782
1230 6784
1230-6784
1230 5942
1230-5942
1230 5944
1230-5944

These references are included to assist with technical identification and online searches.

They should not be interpreted as automatic one-to-one cross-references. A binding pump assignment requires the original Bosch nameplate, the complete engine designation and confirmation of the relevant technical configuration.

Applications of Bosch P9 Injection Pumps

Bosch P9 inline fuel injection pumps are used primarily in high-output medium and large diesel engines.

Typical applications include:

marine propulsion engines
marine main engines
marine auxiliary engines
industrial diesel engines
generator sets
emergency power systems
stationary power-generation engines
power-station installations
railway locomotives
pump drives
compressor drives
mining machinery
heavy-duty industrial equipment
and other continuously operated diesel installations

Mechanical injection pumps of this type are found in the environment of engines manufactured by companies including:

MWM
Deutz
MTU
MAN
Wärtsilä
Cummins
and other manufacturers of industrial and marine diesel engines

The specific pump version always depends on the engine model, number of cylinders, rated output, rated engine speed and application.

The engine-manufacturer name alone is therefore not sufficient for correct pump identification.

Why Bosch P9 Overhaul Requires Specialist Knowledge

Bosch P9 pumps combine large fuel-delivery components with precise mechanical control and timing.

Their individual pump sections must operate uniformly despite high mechanical loading and long operating periods. Wear may occur gradually and may not always be visible during an external inspection.

Relevant components include:

plunger-and-barrel assemblies
pump plungers
pump barrels
delivery valves
camshaft
cam profiles
roller tappets
tappet rollers
bearings
bushes
shafts
springs
actuating components
adjustment mechanisms
sealing surfaces
housing bores
and component fits

Wear or dimensional deviation in any of these areas may influence fuel delivery, repeatability and cylinder-to-cylinder uniformity.

This is why a professional repair cannot be based solely on visual inspection.

The pump must be dismantled, cleaned, measured and evaluated as a complete precision assembly.

Our Bosch P9 Overhaul Process

1. Incoming Inspection and Pump Identification

Before dismantling, we document the Bosch P9 injection pump in the condition in which it arrives.

We record:

Bosch pump type
Bosch part number
MWM, Deutz, MTU or other manufacturer references
direction of rotation
drive configuration
number of pump sections
visible damage
corrosion
fuel or oil leakage
missing components
previous repair work
and information about the associated engine

Clear photographs of the pump and its nameplate should therefore be supplied before shipping whenever possible.

2. Controlled Dismantling

The injection pump is dismantled professionally into its individual components and functional assemblies.

Existing component positions, mechanical relationships and relevant basic settings are documented during dismantling.

The required level of disassembly depends on:

pump design
technical condition
type of damage
previous repair work
and intended overhaul scope

3. Multi-Stage Cleaning

After dismantling, the housing, mechanical components and fuel-delivery parts are cleaned using suitable workshop processes.

The cleaning procedure removes:

old lubricating oil
diesel-fuel residue
deposits
contamination
corrosion products
and particles caused by wear

Reliable dimensional and visual inspection is only possible once the relevant components are thoroughly clean.

4. Visual Inspection and Precision Measurement

The cleaned components are inspected and measured individually.

Depending on the pump version, the inspection may include:

plunger-and-barrel assemblies
delivery valves
camshaft
individual cam profiles
roller tappets
tappet rollers
bearings
bushes
shafts
springs
control components
actuating mechanisms
adjustment mechanisms
sealing surfaces
housing bores
and mechanical fits

Components are reused only when their technical condition and dimensional accuracy permit reliable continued operation.

5. Repair or Replacement of Worn Components

Worn, corroded or damaged components are replaced or professionally reconditioned where technically permissible.

Required parts may include:

pump elements
plunger-and-barrel assemblies
delivery valves
bearings
bushes
tappet rollers
roller bearings
needle bearings
shaft seals
O-rings
flat gaskets
springs
connection components
and pump-specific mechanical parts

Where suitable original parts are no longer available, we assess whether the component can be restored or reproduced through reverse engineering.

6. Precision Reassembly

Once all components have been inspected and the required repair work has been completed, the Bosch P9 pump is reassembled under controlled workshop conditions.

During assembly, we check:

component orientation
mechanical clearances
bearing positions
movement of all operating mechanisms
interaction between the pump sections
sealing surfaces
and the relevant basic mechanical settings

Correct assembly is essential before meaningful test-bench calibration can begin.

7. Test-Bench Operation and Calibration

Following reassembly, the injection pump is operated and calibrated on a suitable fuel injection pump test bench.

Depending on the pump version and the available technical specifications, testing may include:

fuel delivery from every pump section
comparison of individual delivery quantities
uniformity across all cylinders
delivery behaviour at different pump speeds
repeatability of measured values
mechanical actuation
operation of adjustment mechanisms
leakage testing
shut-off behaviour where applicable
and calibration according to available Bosch or engine-manufacturer specifications

The pump is released only after its mechanical operation and relevant delivery values have been verified.

Test-Bench Calibration for Large Bosch P9 Pumps

Accurate test-bench calibration is an essential part of every professional Bosch P9 overhaul.

Uniform fuel delivery affects:

cylinder balance
engine output
fuel consumption
combustion quality
exhaust-gas temperatures
smooth engine operation
component loading
operational reliability
and engine service life

Our workshop operates specialised test equipment for mechanical inline fuel injection pumps.

Our standard large-pump test-bench capability includes inline pumps with up to twelve pump sections.

For particularly large injection systems, we also operate a specially designed 16-cylinder fuel injection pump test bench.

Its technical configuration includes:

an extended pump bed
increased rotating mass
a high-capacity drive system
mounting capability for large inline fuel injection pumps
and testing of complete tandem pump assemblies

The test-bench configuration enables large mechanical injection systems to be evaluated in a manner appropriate to their design and application.

Tandem Injection Pump Testing and Synchronisation

Some V16 diesel engines use two mechanically coupled fuel injection pumps operating together as one tandem system.

In these applications, testing each pump separately does not completely verify how both pumps operate when mechanically connected.

Where the pump design, mounting arrangement and available technical data permit, the two pumps can:

be inspected and calibrated individually,
be installed as a complete tandem assembly,
be operated together on the 16-cylinder test bench,
and be synchronised as one injection system.

Correct tandem synchronisation is important for:

uniform fuel delivery to all cylinders
minimum cylinder-to-cylinder deviation
balanced engine output
uniform exhaust-gas temperatures
smooth engine operation
reliable load acceptance
and long-term operational reliability

Please send photographs and technical information before shipping a tandem assembly so that the mounting and testing requirements can be assessed in advance.

Reverse Engineering of Obsolete Bosch P9 Components

The supply of original spare parts for many historical Bosch P9 fuel injection pumps is now limited.

Numerous components have been discontinued by the original manufacturers even though the associated industrial, marine and power-generation engines remain in active service.

An unavailable individual part does not necessarily mean that the complete injection pump is beyond repair.

Where technically and economically feasible, an existing original component can be:

precisely measured
dimensionally documented
assessed according to its function
reconstructed in CAD
specified for suitable material properties
manufactured by specialised European production partners
dimensionally inspected
and tested before installation

Depending on the component, the reverse-engineering process considers:

dimensional accuracy
tolerances
fits
material specification
hardness
heat treatment
surface finish
mechanical loading
wear behaviour
lubrication conditions
and long-term operational reliability

The feasibility of reproduction is assessed individually for each component.

Safety-critical and highly loaded components are manufactured only where their technical function, material requirements and quality-control criteria can be defined sufficiently.

Bosch P9 Spare Parts and Component Support

Our own stock contains a growing range of wear parts and replacement components for historical mechanical fuel injection pumps.

Depending on the Bosch P9 version, required components may include:

pump elements
plunger-and-barrel assemblies
delivery valves
bearings
bushes
rollers
roller tappets
seals
shaft seals
O-rings
springs
actuating components
connection parts
housing components
and specially reproduced replacement parts

Components that are not immediately available may be:

sourced from existing stock
professionally reconditioned
repaired where technically permissible
or reproduced through reverse engineering

Own stock and access to specialised European manufacturing capabilities help reduce unnecessary downtime, particularly for marine, industrial and power-generation applications.

Typical Reasons for a Bosch P9 Pump Assessment

A Bosch P9 injection pump should be inspected when symptoms or operating data indicate possible irregular fuel delivery or mechanical wear.

Typical reasons for an assessment include:

visible fuel or oil leakage
corrosion after extended storage
seized or restricted mechanical movement
unequal exhaust-gas temperatures
uneven engine operation
reduced engine output
poor starting behaviour
excessive smoke
irregular fuel delivery
contamination of the fuel system
damage following water ingress
extended periods out of service
unknown previous repair work
or overhaul of the corresponding engine

These symptoms do not automatically prove that the injection pump is the sole cause of the problem.

The complete fuel system, injectors, engine condition and available operating data should also be considered during fault diagnosis.

International Bosch P9 Repair Service

Einspritzpumpen Manufaktur NRW is based in North Rhine-Westphalia, Germany.

We receive enquiries from:

engine operators
shipping companies
power-generation businesses
industrial companies
engine rebuilders
service companies
spare-parts specialists
and diesel-injection workshops

Bosch P9 pumps and individual components can be sent to our workshop from other European countries and international locations by prior arrangement.

Before shipping, please provide the available pump and engine information. This allows us to determine:

whether the pump can be accepted
which documentation is required
whether special transport precautions are necessary
whether a complete tandem assembly is involved
and which technical information is still missing

Please do not dismantle or unnecessarily clean the pump before contacting us.

Its original condition may provide important evidence of leakage, corrosion, contamination, wear or previous mechanical intervention.

Frequently Asked Questions About Bosch P9 Injection Pumps

Do you repair Bosch P9 fuel injection pumps?

Yes. Bosch P9 inline fuel injection pumps are one of our principal specialist areas.

We provide technical identification, complete dismantling, component inspection, precision measurement, repair, reassembly and test-bench calibration.

Can you overhaul a Bosch FA-PE8/9M/160/100/LV?

Pumps with the designation FA-PE8/9M/160/100/LV can be submitted for individual technical assessment.

The possible overhaul scope depends on the exact pump version, technical condition, available calibration data and availability or reproducibility of the required components.

Can you repair a Bosch B 405 980 024 injection pump?

Bosch P9 pumps carrying part numbers such as B 405 980 024 can be assessed for repair and overhaul.

Please provide the complete Bosch type designation, nameplate photograph, engine details and pictures of the complete pump before shipping.

Is a Bosch P9 overhaul more than a seal replacement?

Yes.

Replacing gaskets and seals may correct an external leak, but it does not assess the condition of the pump elements, camshaft, tappets, rollers, bearings, delivery valves or other functional components.

A complete overhaul includes dismantling, cleaning, dimensional inspection, repair, reassembly and test-bench calibration.

Is every Bosch P9 pump calibrated after overhaul?

A mechanically overhauled pump must be operated and calibrated on suitable test equipment before returning to service.

The exact procedure depends on the pump design and available technical specifications.

Can obsolete Bosch P9 parts be reproduced?

Many discontinued components can be measured, technically reconstructed and reproduced where their function, material specification and manufacturing requirements can be defined reliably.

The technical and commercial feasibility is assessed separately for each component.

Is the Bosch part number sufficient for pump identification?

Not always.

The Bosch part number is an important reference, but a reliable identification also requires:

a clear photograph of the complete nameplate
photographs of the pump
the exact engine model
the number of cylinders
rated output
rated engine speed
direction of rotation where known
and the application of the engine

Do you also assess Bosch P9 variants not listed on this page?

Yes.

The types and part numbers listed on this page represent only a selection. Other Bosch P9 pump versions can also be submitted for technical assessment.

Can international customers send Bosch P9 pumps to Germany?

Yes, by prior arrangement.

Please contact us with the identification details and photographs before shipping the pump.

Request a Bosch P9 Fuel Injection Pump Assessment

For an initial technical evaluation, please provide as much of the following information as possible:

clear photograph of the complete nameplate
complete Bosch pump type
Bosch part number
available MWM, Deutz, MTU or other manufacturer references
engine manufacturer
exact engine designation
number of cylinders
rated engine output
rated engine speed
direction of rotation, if known
marine, industrial or power-generation application
photographs of the complete injection pump from several angles
description of the fault
information about previous repairs
period of storage, if applicable
and any available spare-parts or calibration documentation

A final quotation normally requires dismantling and technical inspection because the internal condition of a Bosch P9 pump cannot be assessed reliably from photographs alone.

After reviewing the information, we will provide an initial technical assessment and advise you on the next steps.

Contact Our Bosch P9 Fuel Injection Pump Workshop

Name *

Company

Country

Email Address *

Telephone Number

Engine Manufacturer and Model

Bosch Pump Type

Bosch Part Number

Description of the Fault *

Upload Nameplate and Pump Photographs

Submit Technical Enquiry

Einspritzpumpen Manufaktur NRW

Specialist for Bosch P9 Inline Fuel Injection Pumps

Professional:

Bosch P9 fuel injection pump repair
Bosch P9 fuel injection pump overhaul
Bosch P9 test-bench calibration
Bosch P9 spare-parts support
reverse engineering of obsolete pump components
and testing of large tandem injection-pump systems

For marine, industrial, power-generation and stationary diesel engines.

Request a Bosch P9 Repair Assessment