Volvo Penta - O-Ring - 861830
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The Volvo Penta 861830 is a genuine OEM O-ring used in the lubricating oil system on select Volvo Penta marine diesel engines. This sealing ring is commonly shown in the oil system schematic near the oil filter and pressure reduction valve assembly, where it helps seal internal oil passages and prevent oil leakage during engine operation.
Key Features
- Genuine Volvo Penta OEM O-ring
- Volvo Penta part number: 861830
- Used in select Volvo Penta lubricating oil system assemblies
- Commonly referenced near the oil filter and pressure reduction valve area
- Helps seal oil system components against fluid leakage
- Should be replaced whenever the surrounding oil line, filter housing, or reduction valve assembly is opened
- Correct replacement where the Volvo Penta parts diagram specifically calls for 861830
Engine Compatibility
Common Volvo Penta application associated with O-ring 861830 includes:
Volvo Penta Marine Diesel Engines
- MD2010-C
This O-ring may also be used on related Volvo Penta lubricating system assemblies where the engine parts diagram calls for part number 861830.
Serial Number Fitment Notice
Confirm fitment by Volvo Penta engine model, serial number, and the correct lubricating system diagram. This O-ring should be matched by diagram position and part number, especially around the oil filter and pressure reduction valve area, where several small seals and O-rings may appear similar.
When This Part Needs Replacement
Replace this O-ring if oil seepage is present around the related lubricating system component, if the O-ring is flattened, cut, swollen, hardened, or brittle, or whenever the surrounding oil system assembly is disassembled. Reusing an old oil-system O-ring can lead to poor sealing and repeat leaks after service.
Installation Notes
Lightly coat the new O-ring with clean engine oil before installation to help prevent pinching, twisting, or tearing during assembly. Clean the sealing groove and mating surfaces before reassembly. Inspect nearby oil filter components, the pressure reduction valve assembly, and related seals while the area is apart. Follow the Volvo Penta service manual for the correct assembly procedure.
Alternate/Superseded Part Numbers
- Current Volvo Penta Part Number: 861830
- Related Lubricating System References: Volvo Penta 861473 oil filter, Volvo Penta 3583580 pressure reduction valve
Parts Desk Insight
Small oil-system O-rings are easy to overlook, but they are important for keeping the lubrication circuit sealed after service. Matching this seal by the Volvo Penta diagram is the safest approach because similar O-rings can vary by size, material, and installation location.
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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
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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.
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