Wave34
Petty Officer 1st Class
- Joined
- Oct 17, 2017
- Messages
- 344
The boat is a 2004 Chaparral Signature 5.7L MPI
I don't know if it's related but it happened at the same time.
The las week end, I was 2 days on the lake, and decided to open the hatch to check for a water leak since there was a lot of water the last time I used the boat.
What I saw, with the engine idling, was a water fall of water coming from the water heater nipple.
Since it is the original 2004 unit, corrosion was my guess.
I took the boat out of the water, drained the bilge, and maybe at least 20 gallons of water came out.
The rear bilge pump didn't pump that water since the boat has a nose down attitude, and the water was collecting at the bow.
What I remember, while going back to the marina, the temperature was a bit low, like 148 instead of 154. But no overheating.
So, at home, I removed the water heater, and to simulate the water heater circuit, I jumped the hose from the big hose at the thermostat on starboard, to the engine block on port.
I tested the engine on the hose, and the temperature slowly climbed to 185 in 20 minutes.
So I thought my bypass was not a good way to do it, so I removed it, and plugged the 2 nipples and tested again, with the same result.
So, I went and bought a Volvo thermostat, even if the one there was only 2 months old (Volvo unit).
Tested again, same result.
I looked at the impeller, it looks brand new, because it is. A Volvo part that I replaced last summer at the same time as the RWP bearing and double lip Vitton seal.
The manifolds and risers are barely warm. I can hold my hand on them for a day if I want.
So now I'm looking for suggestions.
Is it a different problem that happened at the same time or is it related to the water heater problem???
I don't know if it's related but it happened at the same time.
The las week end, I was 2 days on the lake, and decided to open the hatch to check for a water leak since there was a lot of water the last time I used the boat.
What I saw, with the engine idling, was a water fall of water coming from the water heater nipple.
Since it is the original 2004 unit, corrosion was my guess.
I took the boat out of the water, drained the bilge, and maybe at least 20 gallons of water came out.
The rear bilge pump didn't pump that water since the boat has a nose down attitude, and the water was collecting at the bow.
What I remember, while going back to the marina, the temperature was a bit low, like 148 instead of 154. But no overheating.
So, at home, I removed the water heater, and to simulate the water heater circuit, I jumped the hose from the big hose at the thermostat on starboard, to the engine block on port.
I tested the engine on the hose, and the temperature slowly climbed to 185 in 20 minutes.
So I thought my bypass was not a good way to do it, so I removed it, and plugged the 2 nipples and tested again, with the same result.
So, I went and bought a Volvo thermostat, even if the one there was only 2 months old (Volvo unit).
Tested again, same result.
I looked at the impeller, it looks brand new, because it is. A Volvo part that I replaced last summer at the same time as the RWP bearing and double lip Vitton seal.
The manifolds and risers are barely warm. I can hold my hand on them for a day if I want.
So now I'm looking for suggestions.
Is it a different problem that happened at the same time or is it related to the water heater problem???
