The OMC King Cobra is the heavy-duty version of the Cobra, built to sit behind larger V8s with a stronger gearset. Like the standard Cobra it is discontinued and hard to find service for, but Brad repairs and rebuilds them. He knows the King Cobra's heavier gearing, its cooling path and its shift setup, and he sources the right OMC parts. If you have a boat worth keeping behind a King Cobra, do not scrap the drive before talking to someone who still works on them.
OMC King Cobra symptoms
- Overheating from the cooling system and an old impeller
- Milky oil from aged driveshaft or prop shaft seals
- Growl or whine from the heavier gearset wearing
- Shift faults from the cable and shift mechanism
- Gimbal bearing noise and hardened, cracked bellows
- Corrosion and neglect from a drive that sat for years
What Brad checks on a King Cobra
- Check the cooling path, water pump and impeller
- Pressure and vacuum test the seals on the old drive
- Inspect the heavier King Cobra gearset and preload
- Verify the shift cable, mechanism and engagement
- Assess the gimbal bearing, u-joints and bellows
- Source correct OMC King Cobra bearings, seals and gears
The fix and what to expect
Brad repairs or rebuilds the King Cobra with correct parts: seals, bearings, the heavier gearset components, water pump, shift parts and bellows as the drive needs, then pressure tests it. Sourcing for a discontinued heavy drive takes longer, and he is upfront about that timeline. For a strong hull behind a big engine, keeping the King Cobra alive beats a costly repower and transom conversion. You get the wear findings and a firm price after teardown.
King Cobra gearing is built for the bigger engines
What sets the King Cobra apart from the standard Cobra is the gearset and the load it was built to carry. It went behind the larger OMC V8 packages, so the lower unit bearings and gears are heavier and the preload setup is more critical, much like the difference between a MerCruiser Alpha and a Bravo. That also means a King Cobra rebuild uses different parts than a plain Cobra, and mixing them up is a common shop mistake. Brad matches the parts to the actual King Cobra in front of him, which on a rare drive is the whole ballgame.