steve_garofalo
Seaman Apprentice
- Joined
- Apr 13, 2009
- Messages
- 30
Hello all, been a while since I've posted but the water is warming up in Wisconsin and we got back from our second weekend trip with the kids on the lakes.
I noticed towards the end of last year that the temp gauge on my boat is pegging at the 250 degree mark, at first I thought it was just a blown gauge or faulty wiring until last weekend when I noticed some water splash on the intake manifold and it boiled away! ! ! Oh crap!
Bit of history, we had this same problem before and what I ended up doing was putting a new water pickup on the bottom of the boat and completely bypassing the water pickup on the stern drive. That completely cured the problem then, we were seeing some serious temp climbing when on plane and come to find out that the system was not pulling enough water to fully cool the engine, idle back down to a slow plane and the temp dropped.
That being said, after the first trip this summer I replaced the raw water impeller. The guy at West Marine said mine looked fine, but for $60 it was a good solid piece of mind. Ran a garden hose to the raw water intake and the engine remained cool as it always had before so I thought my problem was cured...
Till we got out on the lake yesterday, I noticed that I no matter what I did, fast, slow, idle or anything the temp gauge pegged at 250 shortly after starting the boat. Water was dumping from the side tube on the drive, and plenty was coming through the exhaust outlet on the drive. The intake felt "hot" but the exhaust logs were cool to the touch, along with all hoses feeling cool. Water temp was probably around 75ish or so I would guess. Spent a lot of time swimming (was my only reason for picking that temp of the water)...
Ran the boat when I got home with my garden hose again and the temp stuck right around 200.
Current setup is a small block chevy (350 cid) engine, it has a raw water pickup that feeds what looks to me to be a water pump that you would see on a car (more of a car guy than boat guy so far but that's quickly changing). From there As best as I can tell it goes through the engine out the thermostat housing and splits into the exhaust manifolds.
I pulled the thermostat housing and noticed that there is something that looks like a thermostat but there is no diaphragm in there that would open or close. When I bumped the engine there was water coming from the top of the intake.
Anyone have any ideas of what else I can check to help cool this engine? When we first got the boat it would run all day long and the temp gauge barley moved. Now I am afraid of running for any amount of time for fear of wrecking the otherwise great running engine!
I noticed towards the end of last year that the temp gauge on my boat is pegging at the 250 degree mark, at first I thought it was just a blown gauge or faulty wiring until last weekend when I noticed some water splash on the intake manifold and it boiled away! ! ! Oh crap!
Bit of history, we had this same problem before and what I ended up doing was putting a new water pickup on the bottom of the boat and completely bypassing the water pickup on the stern drive. That completely cured the problem then, we were seeing some serious temp climbing when on plane and come to find out that the system was not pulling enough water to fully cool the engine, idle back down to a slow plane and the temp dropped.
That being said, after the first trip this summer I replaced the raw water impeller. The guy at West Marine said mine looked fine, but for $60 it was a good solid piece of mind. Ran a garden hose to the raw water intake and the engine remained cool as it always had before so I thought my problem was cured...
Till we got out on the lake yesterday, I noticed that I no matter what I did, fast, slow, idle or anything the temp gauge pegged at 250 shortly after starting the boat. Water was dumping from the side tube on the drive, and plenty was coming through the exhaust outlet on the drive. The intake felt "hot" but the exhaust logs were cool to the touch, along with all hoses feeling cool. Water temp was probably around 75ish or so I would guess. Spent a lot of time swimming (was my only reason for picking that temp of the water)...
Ran the boat when I got home with my garden hose again and the temp stuck right around 200.
Current setup is a small block chevy (350 cid) engine, it has a raw water pickup that feeds what looks to me to be a water pump that you would see on a car (more of a car guy than boat guy so far but that's quickly changing). From there As best as I can tell it goes through the engine out the thermostat housing and splits into the exhaust manifolds.
I pulled the thermostat housing and noticed that there is something that looks like a thermostat but there is no diaphragm in there that would open or close. When I bumped the engine there was water coming from the top of the intake.
Anyone have any ideas of what else I can check to help cool this engine? When we first got the boat it would run all day long and the temp gauge barley moved. Now I am afraid of running for any amount of time for fear of wrecking the otherwise great running engine!
