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Quote reference: Part No. 197-4855
Need help identifying this part?Auxiliary Sea Water Pump for selected 3412 and 3408B marine engines
Caterpillar 197-4855 Auxiliary Sea Water Pump – 3412 & 3408B Marine Engines
The Caterpillar 197-4855 Auxiliary Sea Water Pump is designed for the auxiliary raw-water cooling system on selected Caterpillar 3412 and 3408B marine engines. The pump circulates external seawater through the marine cooling system, helping transfer heat away from the engine through the associated heat exchangers and coolers.
The 197-4855 / 1974855 pump is available as a new replacement, while 0R-7731 / 0R7731 is the Caterpillar Reman alternative. Several additional numbers, including 105-2457, 109-1660, 186-3710 and 6I-1928, are found in the aftermarket as interchange or replacement references for this pump family.
Alfa Marine Spare Parts supplies new, remanufactured and aftermarket marine cooling-system components for Caterpillar marine diesel engines.
Website: www.alfamarinespareparts.com
Product InformationSpecificationDetailsPrimary Part Number197-4855Number Without Hyphen1974855ProductAuxiliary Sea Water PumpComponentPump GP-AuxiliarySystemMarine Cooling SystemApplicationRaw Water / Sea Water CoolingReman Number0R-7731 / 0R7731Marine EnginesCaterpillar 3412, 3408BIndustrial ApplicationCaterpillar 3412Available OptionsNew, Remanufactured & AftermarketPart Numbers and Interchange References
The following numbers may be encountered when identifying or sourcing this auxiliary sea-water pump:
Part NumberReference197-4855Primary Caterpillar pump number1974855Same P/N without hyphen0R-7731Caterpillar Reman alternative0R7731Same Reman P/N without hyphen105-2457 / 1052457Aftermarket interchange reference109-1660 / 1091660Earlier/interchange reference used in the aftermarket186-3710 / 1863710Earlier/interchange reference used in the aftermarket6I-1928 / 6I1928Aftermarket interchange reference
The 0R-7731 is the confirmed Caterpillar Reman alternative for the 197-4855.
The other numbers are commonly referenced in the aftermarket and should not automatically be treated as direct Caterpillar supersessions for every engine arrangement. Compatibility should be checked against the engine serial number, arrangement number and existing pump before ordering.
Caterpillar 197-4855 Marine Engine Applications
The 197-4855 sea water pump is associated with selected Caterpillar:
Caterpillar 3412 Marine Engine
The Caterpillar 3412 is a V12 diesel engine widely used in marine propulsion and auxiliary applications.
The 197-4855 auxiliary pump can be found on selected 3412 marine configurations, where it provides raw-water circulation through the external cooling circuit.
Relevant application searches may include:
Because different 3412 arrangements can use different pumps, the 3412 engine serial number and arrangement number should be verified before supply.
Caterpillar 3408B Marine Engine
The Caterpillar 3408B is another confirmed marine-engine family associated with the 197-4855 auxiliary water pump.
On applicable 3408B marine installations, the pump forms part of the raw-water cooling circuit and provides the seawater flow required for effective heat rejection.
Relevant searches include:
What Does the 197-4855 Sea Water Pump Do?
A marine diesel engine produces a considerable amount of heat during operation. The closed freshwater cooling circuit removes heat from the engine, but that heat ultimately has to be transferred outside the vessel.
This is where the auxiliary sea water pump becomes important.
The 197-4855 draws and circulates raw seawater through the appropriate external cooling circuit. Depending on the engine installation, this seawater can pass through heat exchangers, oil coolers and other cooling components before being discharged.
Correct seawater flow is especially important when the engine is operating continuously at high load.
A pump that has lost efficiency may still circulate enough water while the engine is idling but fail to provide sufficient flow when the engine is operating under load.
Construction for Marine Applications
Marine raw-water pumps operate in a particularly aggressive environment because internal components are continuously exposed to seawater.
The 197-4855 pump design incorporates corrosion-resistant materials suitable for this environment, including a bronze-type housing and stainless-steel shaft structure.
Important components of the pump assembly include the:
All of these components contribute to maintaining reliable seawater circulation.
Caterpillar 0R-7731 Reman Sea Water Pump
The 0R-7731 / 0R7731 is the Caterpillar Reman auxiliary sea-water pump alternative associated with 197-4855.
A remanufactured pump provides another option when replacing a worn original unit.
The remanufacturing process involves disassembly and inspection of the pump, cleaning and restoration of reusable components and replacement of critical wear components such as bearings and seals.
For customers searching for:
197-4855
the corresponding Reman reference to check is:
0R-7731
This makes both numbers important when sourcing a replacement pump.
Aftermarket 197-4855 Sea Water Pump
Aftermarket versions of the 197-4855 auxiliary sea water pump are also available for selected Caterpillar 3408B and 3412 applications.
Aftermarket suppliers may identify compatible pumps using several reference numbers, including:
197-4855 / 1974855
105-2457 / 1052457
109-1660 / 1091660
186-3710 / 1863710
6I-1928 / 6I1928
When supplying an aftermarket pump, Alfa Marine Spare Parts recommends confirming the existing pump number and complete engine information because the same engine family can have different cooling-system arrangements.
Common Signs of Sea Water Pump Problems
A deteriorating sea-water pump does not always fail immediately. Reduced pumping efficiency can develop gradually.
Possible symptoms include reduced seawater discharge, increasing engine temperature under load, cooling-system alarms, water leakage around the pump, unusual bearing or shaft noise and visible corrosion.
One particularly important symptom is an engine that maintains normal temperature at idle but begins running hotter as load increases.
This can indicate inadequate raw-water flow, although the pump should not automatically be assumed to be the cause.
The complete seawater circuit should be inspected.
Other Causes of Reduced Sea Water Flow
Before replacing the 197-4855 pump, the cooling circuit should be checked for other restrictions or failures.
These can include:
A worn impeller is common, but replacing only the impeller will not correct a badly worn housing, damaged shaft or leaking seal.
Why Engine Serial Number Verification Matters
Not every Caterpillar 3412 or 3408B uses exactly the same seawater pump.
Caterpillar engines were produced in numerous arrangements for different vessels, propulsion systems, ratings and cooling-system configurations.
For this reason, a customer requesting a 3412 sea-water pump should ideally provide:
Engine Model: Caterpillar 3412
Engine Serial Number: Complete ESN
Arrangement Number: If available
Existing Pump P/N: 197-4855 or other visible number
Quantity: Required quantity
Photos: Existing pump and identification markings
The same procedure should be followed for Caterpillar 3408B engines.
This information helps confirm whether 197-4855, 0R-7731 or an appropriate aftermarket replacement is correct for the engine.
New, Remanufactured and Aftermarket Options
Alfa Marine Spare Parts can source different replacement options depending on availability and customer requirements.
New Replacement
A new 197-4855 pump provides a complete replacement for the applicable original auxiliary sea-water pump.
Remanufactured
The 0R-7731 is the Caterpillar Reman alternative associated with the 197-4855.
Aftermarket Replacement
Aftermarket replacement pumps may be available using 197-4855 and associated interchange references such as 105-2457, 109-1660, 186-3710 and 6I-1928.
Compatibility should always be verified before installation.
Ordering Caterpillar 197-4855
When requesting a quotation from Alfa Marine Spare Parts, provide as much identification information as possible.
A typical request can include:
Part: Auxiliary Sea Water Pump
Part Number: 197-4855
Reman Number: 0R-7731
Engine: Caterpillar 3412 Marine
Engine Serial Number: [ESN]
Quantity: [Quantity]
Condition Required: New / Reman / Aftermarket
Delivery Location: [Country / Port]
For additional Caterpillar marine engine parts, cooling-system components and replacement pumps, visit:
Frequently Asked QuestionsWhat is Caterpillar part number 197-4855?
197-4855 is an auxiliary water pump used as a sea-water/raw-water circulation pump on selected Caterpillar marine engine applications.
Which marine engines use 197-4855?
Confirmed marine engine families include the Caterpillar 3408B and Caterpillar 3412.
Exact compatibility depends on the engine arrangement and serial number.
What is the Reman number for Caterpillar 197-4855?
The Caterpillar Reman alternative is 0R-7731 / 0R7731.
Is 0R-7731 a sea water pump?
Yes. 0R-7731 is a remanufactured auxiliary sea-water pump for applicable Caterpillar engine configurations.
Is 1974855 the same as 197-4855?
Yes. 1974855 is simply the part number written without the hyphen.
What aftermarket numbers cross-reference to 197-4855?
Aftermarket interchange information can include 105-2457, 109-1660, 186-3710 and 6I-1928.
These numbers should be treated as interchange references rather than automatically assuming they are direct Caterpillar supersessions for every application.
Can I use 197-4855 on every Caterpillar 3412?
No. The Caterpillar 3412 engine family was produced in different configurations and can use different cooling-system components.
Always verify the engine serial number, arrangement number and existing pump part number.
Can Alfa Marine Spare Parts supply an aftermarket 197-4855?
Depending on availability, Alfa Marine Spare Parts can supply new, remanufactured and aftermarket replacement options for Caterpillar marine cooling-system components.
Request a Quote
Looking for a Caterpillar 197-4855, 0R-7731, 105-2457, 109-1660, 186-3710 or 6I-1928 auxiliary sea water pump?
Send Alfa Marine Spare Parts your:
Engine model + engine serial number + existing part number + quantity + photos + delivery location.
Alfa Marine Spare Parts
Email:Request A Quote | Alfa Marine Spare Parts request@alfamarinespareparts.com
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