MerCruiser 1.9L Diesel Fuel Injection Pump O-Ring 8M0067212
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MerCruiser 1.9L Diesel Fuel Injection Pump O-Ring — 8M0067212
| Field | Detail |
|---|---|
| Part Number | 8M0067212 / 25-8M0067212 |
| Brand | Mercury Marine / MerCruiser |
| Official Product Type | Fuel Injection Pump O-Ring (OEM) |
| Supersedes | None on record |
| Replaced By | No supersession on record — verify current Mercury parts catalog |
| System | Fuel — Injection Pump Assembly |
| Diagram Position | Injection Pump Assembly, Reference #13 |
| Quantity Required | 4 per injection pump assembly |
| Paired Fitting | 8M0066245 (injection pump fitting) |
| UPC | 745061190184 |
| Sold As | Individually — order 4 for a complete pump service |
Engine Family & Compatible Applications
Mercury parts diagrams list 8M0067212 in the injection pump assembly for Volkswagen-based MerCruiser diesel engines. Confirm by engine serial number before ordering.
- MerCruiser 1.9L SDI 40 I4
- MerCruiser 1.9L SDI 50 I4
- MerCruiser 1.9L SDI 60 I4
- MerCruiser 1.9L TDI 40 I4
- MerCruiser 1.9L TDI 75 I4
Serial Number & Fitment Notice
Confirm the engine model and MerCruiser serial number before ordering. Several different O-rings and seals are used within this injection pump assembly — including 8M0068132 — and seals that look similar are not automatically interchangeable. Always match by diagram position and part number, not by appearance.
Dimensions
Exact O-ring dimensions are not published in the Mercury consumer catalog. For precise cross-reference sizing, consult the Mercury MerCruiser diesel service manual for the applicable 1.9L SDI/TDI engine.
When to Replace
- Whenever an injection pump fitting is removed
- Visible fuel seepage around fitting connections
- Seal is flattened, hardened, or brittle
- Cuts, nicks, or surface damage to the O-ring
- Any injection pump service that disturbs the original seal
Small fuel-system O-rings should not be reused after compression and removal.
Service Interval
Replace at every injection pump disassembly, or whenever fuel seepage is detected at the fitting connections. Do not reinstall a removed O-ring even if it appears undamaged.
Installation Notes
- Clean all sealing surfaces before installing the new O-ring
- Seat the O-ring correctly — ensure it is not twisted or pinched
- Inspect fitting 8M0066245 sealing surfaces while the pump is apart
- Four fittings and four O-rings are shown in the assembly diagram (ref #13)
- Follow the applicable Mercury MerCruiser diesel service procedure for all fuel-system work
Alternate & Superseded Part Numbers
- 8M0067212 — Mercury / MerCruiser OEM number
- 25-8M0067212 — Mercury catalog prefix format
No additional superseded numbers should be substituted unless confirmed against the engine serial number and current Mercury parts catalog.
Technical FAQ
Q: How many O-rings do I need for a full pump service?
A: The injection pump assembly diagram calls for 4 × 8M0067212 O-rings (reference #13) — one per fitting. Order 4 for a complete service.
Q: Can I reuse the old O-ring if it looks OK?
A: No. Fuel-system O-rings take a compression set when installed. Once removed, they should be replaced even if they appear undamaged.
Q: Is 8M0068132 the same O-ring?
A: No. 8M0068132 is a different seal used elsewhere in the same injection pump assembly. Always match by diagram reference number and part number, not by appearance or location estimate.
Q: Does this fit my SDI or TDI engine?
A: This O-ring is listed for both 1.9L SDI and 1.9L TDI MerCruiser diesel engines across 40–75 hp ratings. Verify with your engine serial number and the Mercury parts diagram for your specific model.
Related Parts
- 8M0066245 — Injection pump fitting (paired with this O-ring, qty 4 in assembly)
- 8M0068132 — Alternate injection pump seal (different diagram position — not interchangeable)
Parts Desk Insights
This is one of the more commonly missed items during a 1.9L diesel injection pump service — customers often order just one O-ring when the assembly requires four. If you're pulling the injection pump apart, order four of these at the same time. The other common issue is confusing this with 8M0068132, which is a different seal in the same assembly. Match by diagram position (#13) and part number, not by looks.
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
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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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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:
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