Image unavailable Alfa Marine Spare Parts is an independent supplier and is not an authorized Caterpillar dealer. Caterpillar names and part numbers are used for identification purposes only.
Quote reference: Part No. 436-1239
Need help identifying this part?Auxiliary Water Pump
Product Tags: Caterpillar auxiliary sea water pump for sale, Caterpillar Auxiliary Water Pump 4361239, Caterpillar Auxiliary Water Pump for C32 engine, CAT auxiliary sea water pump
Caterpillar 436-1239 Sea Water Auxiliary Pump | 30R-1359 Reman
The Caterpillar 436-1239 / 4361239 Sea Water Auxiliary Pump is used in selected Caterpillar engine cooling system applications. It circulates water through the applicable auxiliary cooling circuit and is an important component for maintaining correct engine operating temperature.
For customers requiring a remanufactured alternative, the associated Caterpillar Reman reference is 30R-1359 / 30R1359.
Product Category: Water Pump
New Part Number: 436-1239 / 4361239
Reman Part Number: 30R-1359 / 30R1359
Part Type: Sea Water Auxiliary Pump / Auxiliary Water Pump
Warranty: 1 Year
Condition Options: New / Genuine Caterpillar / Caterpillar Reman, subject to availability
Caterpillar 436-1239 & 30R-1359 Part NumbersSupply TypePart NumberDescriptionNew / Genuine Caterpillar436-1239 / 4361239Sea Water Auxiliary PumpCaterpillar Reman30R-1359 / 30R1359Reman Auxiliary Water Pump
The applicable Reman relationship is:
436-1239 / 4361239 → 30R-1359 / 30R1359 Reman
The exact pump should always be verified against the individual engine serial number and arrangement before ordering.
Caterpillar 436-1239 Engine Applications
The 436-1239 Sea Water Auxiliary Pump is documented for selected Caterpillar applications including:
Application compatibility can depend on the individual engine configuration, serial number and arrangement.
For accurate identification, provide:
Engine model + complete serial number + serial-number prefix + arrangement number + existing pump part number
Do not assume that every Caterpillar C32 engine uses the same auxiliary water pump.
Caterpillar C32 Sea Water Pump Part Numbers
Different Caterpillar C32 configurations can use different sea water and auxiliary water pump assemblies.
References associated with applicable C32 configurations can include:
Applicable Caterpillar Reman auxiliary water pump references across different C32 configurations can include:
Important Compatibility Note
These part numbers represent different pump configurations and applications.
They should not be treated as direct replacements for 436-1239 / 4361239 unless compatibility has been verified against the individual engine.
For the 436-1239, the relevant Caterpillar Reman relationship is:
436-1239 → 30R-1359 Reman
Always verify the engine serial number and arrangement before ordering.
New Caterpillar 436-1239 Water Pump
The 436-1239 / 4361239 is the new Caterpillar reference for the applicable Sea Water Auxiliary Pump.
When requesting a new pump, provide:
If genuine Caterpillar supply is mandatory, clearly state:
Genuine Caterpillar required
New describes the supply condition and should not automatically be interpreted as genuine OEM unless the represented manufacturer is confirmed.
Caterpillar 30R-1359 Reman Auxiliary Water Pump
The 30R-1359 / 30R1359 provides the Caterpillar Reman option associated with the applicable 436-1239 / 4361239 pump application.
Customers requesting the Reman option should provide the same engine identification used for the new pump.
When requesting 30R-1359, also confirm any applicable:
These conditions should be established in the individual quotation.
Caterpillar C32 Marine Engine Water Pump
The Caterpillar C32 is available in different engine configurations and applications.
A request stating only:
C32 water pump
may therefore not provide enough information for accurate identification.
For marine applications, provide:
C32 engine model + complete serial number + serial-number prefix + arrangement number + existing pump number
This helps distinguish 436-1239 / 4361239 from other C32 water pump references.
Sea Water Auxiliary Pump Function
The Sea Water Auxiliary Pump forms an important part of the applicable engine cooling system.
Its function is to maintain water circulation through the relevant cooling circuit.
Insufficient water flow can contribute to:
However, an overheating condition does not automatically prove that the water pump has failed.
The complete cooling system should be investigated.
Check the Complete Cooling System
Before replacing the pump, inspect applicable:
A new or remanufactured water pump cannot overcome a restricted water supply.
Replacing a pump without correcting an external cooling restriction may not solve the original problem.
Caterpillar 436-1239 Water Pump Replacement
When replacing an existing pump, compare the replacement against the installed component before installation.
Verify:
Existing part number → proposed replacement part number
For a new pump:
436-1239 / 4361239
For the associated Reman option:
30R-1359 / 30R1359
Do not select another C32 pump simply because the mounting arrangement or external appearance looks similar.
Internal configuration and application can differ.
1-Year Warranty
The Caterpillar 436-1239 / 4361239 Sea Water Auxiliary Pump and applicable 30R-1359 / 30R1359 Reman Auxiliary Water Pump supplied by Alfa Marine Spare Parts are available with a:
1-Year Warranty
Warranty coverage is subject to the individual quotation, supplied condition and applicable warranty terms.
Warranty conditions should be confirmed before ordering.
How to Order Caterpillar 436-1239 or 30R-1359
For accurate quotation and compatibility verification, send:
Engine manufacturer: Caterpillar
Engine model:
Complete serial number:
Serial-number prefix:
Arrangement number:
Existing pump part number:
Required quantity:
Required condition: New / Genuine / Reman
Delivery destination:
Required delivery date:
For unidentified pumps, include clear photographs showing:
Do not guess unreadable part-number characters.
Why Verify the C32 Engine Serial Number?
Different Caterpillar C32 configurations can use different cooling system components.
The engine serial number and arrangement help establish the individual engine configuration.
This is particularly important when identifying:
A broad engine description such as Caterpillar C32 should therefore not be treated as complete parts identification.
Request Caterpillar 436-1239 / 30R-1359
Looking for a Caterpillar 436-1239 / 4361239 Sea Water Auxiliary Pump or 30R-1359 / 30R1359 Reman Auxiliary Water Pump?
Send your:
Engine model + complete serial number + arrangement number + existing pump part number + required quantity + delivery destination
for quotation and parts identification.
📧 request@alfamarinespareparts.com
Alfa Marine Spare Parts supports international customers with Caterpillar marine, auxiliary and generator engine spare-parts requirements.
Frequently Asked QuestionsWhat is Caterpillar 436-1239?
436-1239 / 4361239 is a Caterpillar Sea Water Auxiliary Pump reference used in selected engine applications.
What is the Reman replacement for Caterpillar 436-1239?
The associated Caterpillar Reman reference is:
436-1239 → 30R-1359
The numbers may also be searched without hyphens as:
4361239 → 30R1359
Is 436-1239 used on Caterpillar C32 marine engines?
It is documented for selected C32 Marine Engine applications. Compatibility should be verified against the individual engine serial number and arrangement.
Is 436-1239 used on C32 marine auxiliary engines?
It is documented for selected C32 Marine Auxiliary applications.
Is 436-1239 used on C32 generator sets?
It is documented for selected C32 Generator Set applications.
Is 436-1239 suitable for every Caterpillar C32?
No. Different C32 configurations can use different water pump assemblies. Verify the engine serial number and arrangement.
Are all C32 sea water pumps interchangeable?
No. Different part numbers can represent different configurations and applications.
Does 30R-1359 replace 436-1239?
30R-1359 / 30R1359 is the associated Caterpillar Reman option for the applicable 436-1239 / 4361239 application.
Does the 30R-1359 require a core?
A Reman pump may be subject to applicable core requirements or charges. Confirm this in the individual quotation.
Does the pump have a warranty?
Applicable 436-1239 and 30R-1359 pumps supplied by Alfa Marine Spare Parts are available with a 1-year warranty, subject to quotation and warranty terms.
Can I identify the pump from a photograph?
Photographs can help, but critical compatibility should not be established from appearance alone. Provide the existing pump number and complete engine identification wherever possible.
Independent Supplier Notice
Alfa Marine Spare Parts is an independent supplier and is not an official or authorized Caterpillar dealer. Caterpillar, Cat and related trademarks, model designations and part numbers are the property of their respective owners and are used for identification and compatibility reference purposes only.
Image unavailable
Image unavailable
Image unavailable
Image unavailable