Mercury MerCruiser Quicksilver O-Ring 23145 | 0.984 x 0.139 in.
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Part Details
- Part Number: 23145
- Service Format: 25-23145
- Brand: Mercury / Quicksilver
- Type: O-ring — sealing ring
- Size: 0.984 in. ID × 0.139 in. cross-section
- System: Multiple — gearcase sealing sleeve, sterndrive, trim/tilt, and Mercury Racing assemblies
- GTIN: 745061131088
- Weight: Approx. 0.005 kg
- Replaces: 843315, F702736
- Aftermarket cross-reference: Sierra 18-7114, Sierra 18-7178, GLM 82140
- Note: 23145 is a shared Mercury sealing ring used across multiple unrelated assemblies. Confirm application, quantity, and diagram position by engine model, serial number, and exploded-view position.
About This Part
Genuine Mercury / Quicksilver 25-23145 is an OEM O-ring used across several Mercury, MerCruiser, Mercury Racing, trim/tilt, and legacy outboard assemblies. Mercury parts references identify it as an O-ring measuring 0.984 in. ID × 0.139 in. cross-section. In older Mercury 700 gearcase assemblies it is specifically listed as the sealing-sleeve O-ring, with two required per assembly. In other Mercury and MerCruiser assemblies it appears in different sealing locations and quantities. Because 23145 is a shared sealing part, its exact function, quantity, and installation method vary by assembly — always confirm by the parts diagram for the specific engine, drive, or trim system being serviced.
Compatible Applications
- Mercury 700 6-cylinder outboard — gearcase sealing-sleeve O-ring (2 required per assembly)
- Mercury 800 6-cylinder outboard — sealing assembly by diagram position
- Selected Mercury 15 HP outboards — by diagram position
- Legacy MerCruiser 80 and 90 sterndrive applications — by diagram position
- Legacy MerCruiser 120/140, 165, 225-S, 228, 233, 250, 260, 470, 485, 888, 898 — by serial number and diagram
- Selected Mercury 5 HP and 9.9 HP outboards — by diagram position
- Mercury Racing M-Series, NXT1, SSM Six, SSM Seven, and dry-sump applications — sealing positions by diagram
- Selected trim / tilt / lift system component groups — by diagram position
Confirm fitment by exact engine model, serial number, and diagram position. The same O-ring appears across many different Mercury and MerCruiser assemblies in different quantities and roles.
When to Replace
Replace this O-ring whenever the related assembly is disassembled, or when inspection shows any of the following:
- Flattening or permanent compression set
- Cuts, nicks, or tearing
- Hardening or brittleness
- Swelling or distortion
- Cracking
- Active leakage at the sealing joint
Reusing a compressed or damaged O-ring after assembly is a common cause of post-service leaks. Replace rather than reuse whenever the seal is disturbed.
Installation Notes
Clean the O-ring groove and all mating surfaces before installation. Lightly lubricate with the assembly lubricant specified in the Mercury service manual for the component being serviced. Seat the O-ring evenly so it is not twisted, stretched, rolled, or pinched during assembly. Because 23145 is used in several different systems, the correct installation method and lubricant must come from the service manual for the specific assembly — do not assume the same procedure applies across different applications.
Related Service Parts
- Mercury MerCruiser Trim Cylinder O-Ring Kit 87400A2 — complete O-ring kit for trim cylinder service
- Mercury MerCruiser Trim Pump Reservoir Screw with O-Ring & Spacer 18527
- Mercury 18545A1 Power Trim Pump Repair Kit — Oildyne MerCruiser Sterndrive
Cross-Reference Part Numbers
- Current OEM: 23145 / 25-23145
- Replaces: 843315 (25-843315), F702736
- Aftermarket: Sierra 18-7114, Sierra 18-7178, GLM 82140
- GTIN: 745061131088
Parts Desk Insight
23145 is a broad-use Mercury sealing ring, and the safest match is always the exact parts-diagram callout for the specific assembly being serviced. The size (0.984 × 0.139 in.) is an important identifier, but diagram position matters just as much because the same O-ring appears in different engines, sterndrives, and trim systems in different quantities. For trim/tilt service in particular, it is worth considering the Trim Cylinder O-Ring Kit 87400A2, which addresses all sealing points in one pass and avoids a second parts order if other rings in the same assembly are also due for replacement.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 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.