Volvo Penta Glow Plug Sealing Ring 859211 | AD31 AD41 TAMD31 TAMD41 TMD31 TMD41
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Part Number: 859211
Brand: Volvo Penta (OEM Genuine)
Official Part Name: Sealing Ring
Application: Glow plug assembly
Genuine Volvo Penta 859211 is a sealing ring used in the glow plug assembly on selected Volvo Penta 31- and 41-series marine diesel engines. It forms part of the glow plug installation hardware stack alongside the thrust sleeve, spring washer, and flange nut. Volvo Penta parts diagrams typically show one sealing ring per glow plug position on applicable engines.
Compatible Applications
- Volvo Penta AD31L-A
- Volvo Penta AD31P-A
- Volvo Penta AD41L-A
- Volvo Penta AD41P-A
- Volvo Penta D41L-A
- Volvo Penta TAMD31L-A
- Volvo Penta TAMD31M-A
- Volvo Penta TAMD31P-A
- Volvo Penta TAMD31S-A
- Volvo Penta TAMD41H-A
- Volvo Penta TAMD41H-B
- Volvo Penta TAMD41L-A
- Volvo Penta TAMD41M-A
- Volvo Penta TAMD41P-A
- Volvo Penta TMD31L-A
- Volvo Penta TMD41L-A
- Also referenced for: AQAD31A, MD31A, TMD31B
- Confirm fitment by engine model, serial number, and glow plug assembly diagram before ordering
Engine Family: Volvo Penta 31-series and 41-series marine diesel
System: Electrical — glow plug / cold-start system
Diagram Position: Glow plug assembly — sealing ring in the glow plug hardware stack (used with thrust sleeve 859328, spring washer 941905, and flange nut 965483)
Serial Number Requirement
Confirm the engine model, serial number, and glow plug assembly diagram before ordering. Volvo Penta used several glow plug and electrical system configurations across the 31- and 41-series engine families.
Superseded / Alternate Part Numbers
- Current OEM: 859211
- No confirmed superseding number identified at this time
When to Replace
- Whenever glow plug service reveals flattening, cracking, deformation, or corrosion on the sealing ring
- Any time a glow plug is removed — replacing the sealing ring ensures a proper seat on reassembly
- When coolant or combustion gas seepage is detected around a glow plug position
Installation Notes
- Inspect the glow plug, thrust sleeve (859328), spring washer (941905), and flange nut (965483) while servicing this component
- Install the sealing ring in the correct sequence as shown in the applicable Volvo Penta parts diagram
- Follow the engine workshop manual for glow plug tightening specifications — over-tightening can damage the sealing surface
- One sealing ring is typically required per glow plug position
Technical FAQ
Is 859211 a generic sealing washer?
No. 859211 is cataloged specifically as part of the Volvo Penta glow plug hardware stack for 31- and 41-series diesel engines. A generic washer of similar dimensions will not necessarily provide the correct sealing geometry for the glow plug bore.
How many do I need?
One sealing ring per glow plug position. Count the number of glow plugs in your engine to determine quantity. Most 31- and 41-series Volvo Penta diesels have 4 or 6 cylinders — order accordingly.
Do I need to replace the other glow plug hardware at the same time?
If the engine has significant hours or if the glow plug assembly is being fully serviced, inspect the thrust sleeve (859328), spring washer (941905), and flange nut (965483) at the same time. Replacing worn hardware together avoids reopening the assembly shortly after.
Parts Desk Insights
This sealing ring is most often needed when glow plugs are being replaced or inspected on higher-hour 31- and 41-series Volvo Penta diesel engines — particularly TAMD41 and TAMD31 variants in workboat and commercial applications. The most common oversight is ordering only the glow plug and skipping the sealing ring, which can result in a compromised seal on reassembly. Order one per cylinder. It is also worth having the thrust sleeve (859328) and spring washer (941905) on hand during the service call, as those components are in the same assembly and are inexpensive to replace preventively.
Related Parts
Shipping information
In-stock and OEM parts: ship same or next business day.
Supplier-stock items are usually ready for pickup or shipping within 24 hours of ordering.
Special-order timing may vary.
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.
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