Volvo Penta MS4B Transmission Sealing Ring - 853757
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The Volvo Penta 853757 Transmission Sealing Ring is a genuine OEM internal sealing component used in compatible Volvo Penta transmission and reverse gear assemblies. Unlike external gearcase O-rings, this sealing ring is installed deeper within the mechanical drive system and is typically serviced during transmission teardown, reseal, or overhaul work.
This part helps maintain fluid sealing integrity around internal shaft and gear assembly areas where the Volvo Penta parts diagram calls for 853757.
Key Features
- Genuine Volvo Penta transmission sealing ring.
- Volvo Penta part number: 853757.
- Replaces legacy Volvo Penta part number: 959026.
- Component type: internal transmission / reverse gear sealing ring.
- Used in compatible Volvo Penta reverse gear and internal drive assemblies.
- Commonly associated with MS4B reverse gear service where listed by diagram.
- Also referenced in heavier Volvo Penta diesel service kit contexts where specified.
- Approximate weight: 0.09 lb / 41 g.
- Designed for internal fluid sealing, shaft sealing, and transmission assembly service.
Transmission Compatibility
Common application context includes Volvo Penta transmission and reverse gear assemblies where 853757 or superseded number 959026 is listed in the parts diagram, including:
- Volvo Penta MS4B reverse gear applications where specified.
- Internal shaft and gear assembly sealing locations.
- Transmission teardown and overhaul service.
- Engine-to-gear interface reseal work where the parts diagram calls for this ring.
- Service kit applications where included with related Volvo Penta gasket and sealing components.
Use this sealing ring only where the exact transmission model, engine model, serial number, and assembly diagram confirm 853757.
Serial Number Fitment Notice
Confirm fitment by Volvo Penta engine model, transmission model, serial number, reverse gear specification, diagram location, and companion sealing parts before ordering. Volvo Penta transmission assemblies can vary by model, production range, ratio, and prior service history.
This is not a universal external O-ring. It is an internal sealing component and should be matched directly to the transmission parts schematic or overhaul kit contents.
When This Part Needs Replacement
Replace this sealing ring during transmission teardown, reverse gear overhaul, internal reseal service, or when inspection shows wear, scoring, hardening, distortion, fluid leakage, pressure loss, or damage at the sealing surface. It may also be replaced when rebuilding a transmission after slipping, contamination, overheating, fluid loss, or internal component service.
Because this part is installed inside the transmission assembly, it is rarely replaced during a basic oil change.
Installation Notes
Disassemble the transmission only according to the Volvo Penta service procedure. Clean all mating surfaces, grooves, shafts, and sealing areas before installing the new ring. Inspect the related bearings, bushings, gears, clutch components, shafts, gaskets, and housing surfaces while the assembly is open.
Lubricate the sealing ring with the specified transmission fluid or assembly lubricant before installation where required. Avoid stretching, twisting, nicking, or forcing the ring into place. After reassembly, refill with the correct fluid, check for leaks, and verify proper pressure and operation according to the service manual.
Related Service Parts & Kits
- Volvo Penta 853757 — current supplied sealing ring part number
- Volvo Penta 959026 — legacy / superseded reference
- Volvo Penta 876073 — related gasket kit reference; verify by engine/transmission model before ordering
- MS4B reverse gear sealing components — verify by parts diagram
- KAMD series service kit references — verify by engine serial number and kit contents
Parts Desk Insight
This sealing ring should be treated as an overhaul-level transmission part, not a routine external service seal. Before ordering, confirm the exact reverse gear model and diagram location. When the transmission is already apart, it is usually smart to inspect the complete sealing package so the unit is not reassembled with one new ring and several aged companion seals.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
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.
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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