OMC Cobra
- Through-hub exhaust
- External trim cylinders
- Single propeller
OMC Cobra
- 1986–1993
Drive specs
| Model years | 1986–1993 |
|---|---|
| Type | Drives |
| Gear ratios | 1.85:1 (lower) · 2.00:1 (lower) |
|---|---|
| Upper gear unit | Upper gear 21/17 (1.23:1) for e.g. 5.0 l, 5.8 l EFI and 7.5 l |
| Oil type | Quicksilver High Performance Gear Lube |
| Oil capacity | 1.89 l |
| Propeller system | Single propeller |
1.77–1.89 L depending on engine; 7.5 L: 3.19 L.
Lower unit variants
| Variant | Gear ratio | Year | Identification | Source |
|---|---|---|---|---|
| Cobra V6/V8 | 1.85:1 | 1986–1993 | Gear ratio 26/14 | sterndrive.info: OMC drive gear ratios and history (external link) |
| Cobra 4-cyl | 2:1 | 1986–1993 | Gear teeth 26/13 | sterndrive.info: OMC drive gear ratios and history (external link) |
| Cobra with cone clutch | — | 1994– | Later version with cone clutch; oil capacity 2.10 l | Quicksilver Application Guide p. 56: oil capacities OMC Cobra (external link) |
Service points
- Drive oil: change it and check that it isn't milky (water)
- Bellows: U-joint bellows, exhaust bellows, shift cable bellows
- Gimbal bearing
- Sacrificial anodes
- Propeller and propeller shaft seals
Troubleshooting
Runs rough, stalls or loses power
Cooling and temperature
Electrics, alarms and fault codes
How to identify the drive
Check the model and serial numbers, not just the engine's output. Tell the Stringer (beam mounting and ball-type gears) apart from the Cobra (transom mounting, U-joint and trim cylinders). 400/800 denote small and large gear housings respectively.
Compare all drives →Official identification charts
- Mariner's Warehouse: How to identify an OMC Cobra lower unit
Spare parts
| Part | Part number | Note | Source |
|---|---|---|---|
| Bellows kit (U-joint bellows, exhaust bellows, shift cable bellows, gimbal bearing, gaskets) | 18-2771 | Sierra number (aftermarket); the U-joint bellows replaces OMC 3854127 | Wholesale Marine: Sierra 18-2771 OMC Cobra bellows kit (external link) |
| Impeller kit (water pump) | 984461 | Original OMC number replaced by the SEI kit | Sterndrive Engineering (SEI): Water Pump Impeller Kit (external link) |
| Water pump kit with housing | 777128 | Original OMC number replaced by the SEI kit | Sterndrive Engineering (SEI): Water Pump Kit (With Housing) (external link) |
| Sacrificial anode kit (Cobra 1986–1993) | 985586 | Original OMC number replaced by the SEI kit | Sterndrive Engineering (SEI): Cobra 1986-1993 Anode Kit (external link) |
| Drive mounting kit (1986–1993) | 508105 | Original OMC number replaced by the SEI kit | Sterndrive Engineering (SEI): Outdrive Installation Kit (1986 - 1993) (external link) |
| Gimbal bearing | 30-879194A02 | According to the dealer, Mercury's gimbal bearing fits all OMC Cobra drives | PowerBoatSupply: gimbal bearing 30-879194A02 (MC-1, R, MR, Alpha 1974–1997, Bravo One 1988–1995) (external link) |
Exploded views & parts catalogs
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Related models
Service guides
Frequently asked questions about OMC Cobra
Which impeller fits the OMC Cobra?
Part number 984461 is listed for this model.
Sources
- sterndrive.info: OMC drive gear ratios and history (external link)
- Quicksilver Application Guide p. 56: oil capacities OMC Cobra (external link)
- GLM Marine: OMC catalog with exploded views (Stringer, Cobra) (external link)
- sterndrive.info: OMC exploded views (external link)
- Wikipedia: Outboard Marine Corporation (en) (external link)
- Wholesale Marine: Sierra 18-2771 OMC Cobra bellows kit (external link)
- Sterndrive Engineering (SEI): Water Pump Impeller Kit (external link)
- Sterndrive Engineering (SEI): Water Pump Kit (With Housing) (external link)
- Sterndrive Engineering (SEI): Cobra 1986-1993 Anode Kit (external link)
- Sterndrive Engineering (SEI): Outdrive Installation Kit (1986 - 1993) (external link)
- PowerBoatSupply: gimbal bearing 30-879194A02 (MC-1, R, MR, Alpha 1974–1997, Bravo One 1988–1995) (external link)
- GLM Marine: 30 Years of the OMC Sterndrive (external link)
- sterndrive.info: OMC 800 and Cobra (external link)
- Mariner's Warehouse: identifying the OMC Cobra