Volvo Penta Hydraulic Trim Pump Seal 3858078
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Volvo Penta 3858078 is a genuine-style seal / O-ring used in select Volvo Penta hydraulic trim pump and trim instrument assemblies. It is shown in Volvo Penta parts diagrams at the hydraulic pump reservoir / cover area, commonly as diagram reference #8, and is used with related components such as filter 3858076, reservoir 854531 / 3861570, cover / cap 3858079, small parts kit 854534, and hydraulic pump 854535 / 3586765 depending on the exact assembly.
Key Features
- Volvo Penta seal / O-ring for supported hydraulic trim pump assemblies
- Used in trim pump, trim instrument, and installation component groups
- Common diagram reference: #8
- Volvo Penta part number: 3858078
- Replaces earlier reference 854532 in supported diagrams
- Genuine OEM Volvo Penta replacement reference
- Common supplier weight reference: approximately 0.03–0.09 lb, depending on listing source
Engine Compatibility
This seal is primarily hydraulic trim pump and transom/drive installation specific, rather than engine-displacement specific. Supporting application references list use with Volvo Penta hydraulic trim pump / trim instrument assemblies on applications including AD41L-A, AD41P-A, D41L-A, and transom / drive groups such as TSK DP-E, TSK DP-S, TSK DPX-C, TSK SX-M, TSK SX-MAC, TSK SX-MACLT, and TSK SX-MDA depending on serial number and trim pump configuration.
Serial Number Fitment Notice
Seal fitment depends on the exact Volvo Penta trim pump assembly, reservoir / cover design, transom shield, drive package, and serial number range. Always confirm compatibility using the Volvo Penta parts diagram before ordering, especially where older reference 854532 has been replaced by 3858078.
When This Part Needs Replacement
Replace this seal if the trim pump reservoir or cover area is leaking, the seal is flattened, swollen, hardened, cut, missing, or damaged during trim pump service. A worn trim pump seal can allow oil leakage, air entry, low fluid level, or repeat service around the hydraulic trim pump assembly.
Installation Notes
Clean the sealing groove and mating surface before installation. Inspect the reservoir, cap / cover, filters, small parts kit, and pump housing while the assembly is apart. Lightly lubricate the seal with the correct trim fluid where appropriate, seat it evenly, and avoid twisting or pinching it during reassembly.
Alternate/Superseded Part Numbers
- 3858078
- Volvo Penta 3858078
- VP3858078
- VOLVO-3858078
- 854532 — earlier reference replaced by 3858078 in supported diagrams
Parts Desk Insight
This seal is easy to confuse with a generic O-ring, but the safest match is the exact hydraulic trim pump diagram location. If the trim pump is already open, checking the reservoir, cap, filters, and small parts kit at the same time can prevent chasing another small leak later.
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
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.