Hey everyone,
I’m looking for some help with my Mariner 150hp outboard (model #0B384105). I’ve been chasing a persistent overheating issue. Here’s what’s happening:
-I’ve already replaced the thermostat and the impeller (and inspected the impeller several times—it looks good and is installed properly).
- compression between 134-138 on all cylinders
- Instead of a solid stream from the telltale, I’m getting water mixed with air bubbles, followed by steam.
- There’s a strong exhaust smell coming from the telltale, and the steam burns your eyes.
The water pressure gauge on the boat is reading 0 psi, so it doesn’t seem to be building any water pressure.
I’ve pulled the cylinder head and found some suspicious spots on the head gasket. I’ll post some photos below—can anyone tell me if it looks blown or if there are other signs I should look for?
I’m looking for some help with my Mariner 150hp outboard (model #0B384105). I’ve been chasing a persistent overheating issue. Here’s what’s happening:
-I’ve already replaced the thermostat and the impeller (and inspected the impeller several times—it looks good and is installed properly).
- compression between 134-138 on all cylinders
- Instead of a solid stream from the telltale, I’m getting water mixed with air bubbles, followed by steam.
- There’s a strong exhaust smell coming from the telltale, and the steam burns your eyes.
The water pressure gauge on the boat is reading 0 psi, so it doesn’t seem to be building any water pressure.
I’ve pulled the cylinder head and found some suspicious spots on the head gasket. I’ll post some photos below—can anyone tell me if it looks blown or if there are other signs I should look for?