Baldwin Oil Filter B1400
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The Baldwin B1400 is a compact, full-flow spin-on oil filter commonly cross-referenced as an aftermarket replacement for Mercury Marine oil filter 8M0162831. It removes wear particles and other contaminants from circulating engine oil while maintaining the lubrication flow required by compatible four-stroke outboards.
The B1400 uses an M20 × 1.5 mounting thread and includes an anti-drainback valve to help retain oil during shutdown, along with a 14 PSID bypass valve. It measures approximately 2⅛ inches long by 2 21/32 inches in outside diameter and carries a 23-micron nominal filtration rating.
Key Features
- Baldwin full-flow spin-on lubricating-oil filter
- Common aftermarket replacement for Mercury 8M0162831
- Thread size: M20 × 1.5
- Length: approximately 2⅛ inches / 66.7 mm
- Outside diameter: approximately 2 21/32 inches / 67.5 mm
- Nominal filtration rating: 23 microns
- Absolute filtration rating: 45 microns
- Integrated anti-drainback valve
- 14 PSID internal bypass valve
- Integral sealing gasket
- Baldwin part number: B1400
Engine Compatibility
Commonly used as a replacement for Mercury and Mariner FourStroke outboards originally specifying oil filter 8M0162831, including:
- Mercury and Mariner 8/9.9 hp FourStroke models with the 323 cc engine
- Mercury and Mariner 15/20 hp carbureted FourStroke outboards
- Mercury and Mariner 15/20 hp EFI FourStroke models with serial number 0R833820 and above
- Mercury and Mariner 25/30 hp EFI FourStroke outboards from model year 2006 and newer
Serial Number Fitment Notice
Confirm the complete outboard model, horsepower, serial number and existing filter number before ordering. Mercury and Mariner outboards with the same advertised horsepower may use different oil filters depending on displacement, production year and engine family.
Do not select this filter solely because it has an M20 × 1.5 thread. The filter height, gasket dimensions, anti-drainback valve and bypass-valve specification must also match the engine's lubrication-system requirements.
When This Part Needs Replacement
Replace the oil filter whenever the engine oil is changed or at the maintenance interval specified in the Mercury or Mariner owner's manual.
Earlier replacement may be appropriate following:
- Extended trolling or low-speed operation
- Frequent short operating cycles
- Heavy-load or high-temperature use
- Fuel, water or debris contamination
- Long periods of seasonal storage
- Internal engine repairs
- Abnormal oil-pressure conditions
Replace the filter immediately if the housing is dented, corroded or leaking.
Installation Notes
Remove the old filter and confirm that its sealing gasket has not remained attached to the engine's filter mounting surface. Clean the sealing surface and compare the new filter's thread, gasket and body dimensions with the removed filter.
Lightly lubricate the new gasket with clean engine oil and install the filter by hand according to the outboard manufacturer's tightening instructions. Do not overtighten.
After installation:
- Refill the engine with the specified grade and quantity of oil.
- Start the engine and allow oil pressure to build.
- Inspect the filter and gasket for leakage.
- Shut the engine down and allow the oil to settle.
- Recheck and correct the engine-oil level.
Alternate/Superseded Part Numbers
Commonly associated OEM, superseded and cross-reference numbers include:
- Baldwin B1400
- Mercury 8M0162831
- Mercury 35-8M0162831
- Quicksilver 8M0162832
- Mercury 8M0162386
- Mercury 822626K03
- Mercury 822626T1
- Mercury 35-822626Q03
- Mercury 851847A02
- WIX 51365
- NAPA Gold 1365
- Fleetguard LF3692
- Honda 15400-ZZ3-003
Cross-reference numbers are comparison aids only. Confirm the original filter number and complete engine application before substituting an aftermarket filter.
Parts Desk Insight
The B1400 is a good dimensional cross-reference for Mercury 8M0162831, but the outboard serial number still matters. Several compact M20 × 1.5 filters look nearly identical, and the internal bypass-valve setting is just as important as the thread and outside size.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.