JohnEasley
New member
Good Morning,
First time poster. I'm hoping the experienced minds here can come up with some ideas. He's what's happening and what we did for diagnostics.
My friend has a 2006 36' Silverton with Crusader 6.1 engines. The plastic cover on the engine says 6.1. A local parts shop said they were only produced for a very short period of time. He's had the boat about a year and a half. At first, it would run fine on multi-day trips. In the last few months, the port engine started running hot on the second or third day. Each time the temp alarm went off, he would check the coolant reservoir and find it empty so he would top it up with coolant and it would be fine for another day or two. Last weekend, we attempted to track down the leak.
Armed with a pressure tester, we topped up the coolant reservoir tank using a two-cup measuring cup. It took two of these to top it up. As soon as we applied pressure at the reservoir tank using the tester, the tank was dry again. Refill, repeat, dry again. Repeat, repeat, repeat. The tester would pump up as high 15-17 psi but wouldn't hold it. It would slowly start to leak down. Within a couple of minutes, it would be down to 10 psi. We had the same results at a variety of pressures from 5 psi up to 17.
Over the span of a couple of hours, we probably poured close to three gallons into the reservoir tank. We never found any leaks around any hose fittings, the thermostat housing, the fresh water pump, or the gaskets on the manifolds, spacers, or risers. We took the end cap off of the heat exchanger and pressurized the system again but nothing dripped out. We removed the exhaust hoses coming from the risers and pressurized the system, no drips. However, by listening closely, we could hear what can only be described as gurgling coming from the exhaust opening of the risers.
The engine starts easily and runs smoothly. There is no excess fluid in the crankcase and the oil is not milky or foamy. There is no sheen on the water near the exhaust when that engine is running; however, the owner reports what appears to be a small amount of steam from that exhaust when running at temperature.
We know a lot about where there is not a leak but we have yet to definitively identify where all of that coolant is going. By process of elimination, we're leaning toward an internal leak somewhere in the manifolds or risers. They are probably the originals from 2006.
Anyone run into this before? What did it turn out to be? Any suggestions or ideas would be greatly appreciated.
Thanks,
John
First time poster. I'm hoping the experienced minds here can come up with some ideas. He's what's happening and what we did for diagnostics.
My friend has a 2006 36' Silverton with Crusader 6.1 engines. The plastic cover on the engine says 6.1. A local parts shop said they were only produced for a very short period of time. He's had the boat about a year and a half. At first, it would run fine on multi-day trips. In the last few months, the port engine started running hot on the second or third day. Each time the temp alarm went off, he would check the coolant reservoir and find it empty so he would top it up with coolant and it would be fine for another day or two. Last weekend, we attempted to track down the leak.
Armed with a pressure tester, we topped up the coolant reservoir tank using a two-cup measuring cup. It took two of these to top it up. As soon as we applied pressure at the reservoir tank using the tester, the tank was dry again. Refill, repeat, dry again. Repeat, repeat, repeat. The tester would pump up as high 15-17 psi but wouldn't hold it. It would slowly start to leak down. Within a couple of minutes, it would be down to 10 psi. We had the same results at a variety of pressures from 5 psi up to 17.
Over the span of a couple of hours, we probably poured close to three gallons into the reservoir tank. We never found any leaks around any hose fittings, the thermostat housing, the fresh water pump, or the gaskets on the manifolds, spacers, or risers. We took the end cap off of the heat exchanger and pressurized the system again but nothing dripped out. We removed the exhaust hoses coming from the risers and pressurized the system, no drips. However, by listening closely, we could hear what can only be described as gurgling coming from the exhaust opening of the risers.
The engine starts easily and runs smoothly. There is no excess fluid in the crankcase and the oil is not milky or foamy. There is no sheen on the water near the exhaust when that engine is running; however, the owner reports what appears to be a small amount of steam from that exhaust when running at temperature.
We know a lot about where there is not a leak but we have yet to definitively identify where all of that coolant is going. By process of elimination, we're leaning toward an internal leak somewhere in the manifolds or risers. They are probably the originals from 2006.
Anyone run into this before? What did it turn out to be? Any suggestions or ideas would be greatly appreciated.
Thanks,
John
