Oberdorfer Marine Engine Parts

(1 products)

This page focuses on Oberdorfer marine engine pumps and service parts—helping you identify compatible components, follow routine maintenance, and troubleshoot common cooling and transfer pump issues. You can also browse our main Water Pumps collection. Scroll to the bottom of the page to start browsing parts, and on the collection page use the Filter & Sort controls to narrow results by flow rate, drive type, and part category.

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How to Identify Your Pump Model

Nameplate/serial plate: Look for a stamped or engraved tag on the pump body or mounting flange. It typically includes the model family (for example, N202M or N992) and build suffixes.
Reading the code and suffix: Suffixes can indicate drive type (shaft/electric), rotation, and port orientation. Example variants you may encounter include N202M-11, N202M-16, or N202M-908.
Rotation and arrow: Many Oberdorfer raw-water pumps have a rotation arrow on the cover; match the impeller and cam orientation accordingly.
Application clues: Rubber impeller pumps are commonly used for raw-water engine/generator cooling, while bronze gear pumps are often used for fuel or oil transfer.

Pump Platform Overview

Rubber Impeller Raw-Water Pumps (e.g., N202M series)

Feature	Description
Configuration	Bronze housing, rubber impeller with cam; commonly shaft-driven; used for raw-water cooling on gasoline/diesel engines and generators.
Common Models	N202M family; variants such as N202M-11, N202M-16, N202M-908 are typical examples found in service.
Advantages	Self-priming, compact, proven for marine cooling duty; wide availability of impellers and spares.
Notes	Service impeller annually or every 100–200 hours; verify rotation and cam orientation; inspect cover plate and wear surfaces during each service.

Bronze Gear Pumps (e.g., N992 series)

Feature	Description
Configuration	Bronze gear-type positive displacement pump for steady transfer of fuel or lubricants.
Common Models	N992 family (e.g., N992R) used in marine transfer and auxiliary applications.
Advantages	Consistent flow and pressure for transfer duties; durable bronze construction.
Notes	Not intended for abrasive or debris-laden fluids; ensure correct relief/ bypass provisions and compatible hose materials.

Routine Maintenance & Service Parts

Intervals below are general guidelines. Always follow the official service manual and your vessel manufacturer’s recommendations.

Item	Interval*	Remarks	Parts Link
Raw-water impeller (rubber)	12–24 months or 100–200 hrs	Replace sooner after dry-run, overheating, or visible vane set.	Water Pump Impeller Rebuild Kits
Pump cover gasket / wear plate	Inspect each impeller service	Replace if scored, warped, or leaking to maintain prime and output.	Gaskets
Shaft seal (pump)	Inspect annually	Look for salt crust at weep hole or drips behind pulley; replace if leaking.	Oil Seals
Pump bearings	Inspect annually	Check for play or noise; replace during seal/shaft service as needed.	Bearings
Raw-water hoses & clamps	Every 2–3 years or at cracks/bulges	Replace softened, cracked, or kinked hose; verify proper suction hose rating.	Hoses
Anodes (engine/raw-water system)	Inspect quarterly	Maintain sacrificial protection in salt/brackish water to prevent corrosion.	Anodes
Fuel filter (genset/engine)	200–300 hrs or annually	Protect transfer and lift pumps from contamination; keep spares onboard.	Fuel Filters
Spark plugs (gasoline engines)	Per engine manufacturer	Use correct heat range and gap; replace if fouled or worn.	Spark plug

Frequently Used Parts Categories

Raw-Water Pumps & Accessories — Water pumps
Impellers & Wear Parts — Impellers
Gaskets & Sealing — Gaskets
Hoses & Plumbing — Hoses
Bearings & Rotating Components — Bearings
Corrosion Protection — Anodes
Fuel System Filtration — Fuel Filters

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak water stream or overheat alarm	Inspect intake screen/strainer for debris; verify impeller condition; check for suction leaks or collapsed hose.	Water pump kit, impeller, cover gasket, hoses, intake screen
Leak at pump or salt crust at weep hole	Check cover O-ring/gasket; inspect shaft seal and shaft wear; confirm fastener torque.	Gaskets, oil seal, wear plate/cover, fasteners
Noise or vibration from pump	Check bearing play and alignment; inspect cam/impeller for damage; verify mounting bracket integrity.	Bearings, impeller, cam, mounting hardware
Hard starting/rough idle (genset/engine)	Replace/inspect fuel filter; check for air leaks on suction side; verify clean fuel and proper hose routing.	Fuel filters, fuel hose, clamps

FAQs

Are parts interchangeable between different Oberdorfer pump variants?

Many spares interchange within the same pump family, but rotation, drive type, and port orientation can change the cover, cam, or impeller used. Always confirm the full model code on the nameplate before ordering.

When should the impeller be replaced?

As a preventative measure, replace the rubber impeller every 12–24 months (or 100–200 hours), and immediately after any dry-run or overheating incident. Inspect vanes for set, cracks, or missing tips.

How often should I service the pump seals and bearings?

Inspect annually for leaks, salt crusting, or bearing play. Replace seals and bearings whenever leakage or noise is detected, or proactively during major cooling system overhauls.

What information do you need to confirm part compatibility?

Provide the complete pump model code and suffix, a clear photo of the nameplate and cover, rotation arrow (if present), drive type, and the engine/generator model it’s installed on.

Ready to find parts? Browse our Water Pumps collection and use the filters to narrow by category and specifications.

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If you’re unsure about your model, send us a photo of the nameplate and the part you need and we’ll help verify compatibility.