daviddraper
Veteran Member
Upon returning home last weekend after a night anchoring out, I pushed our boat to semi-plane to blow out the turbo/exhaust system as I usually do as I normally run slow while underway at around 1400rpm.
While running for about a minute at just over 3000rpm (we have a Mainship 34 Trawler with 370hp Yanmar) my wife and I could smell burning while sitting in the flybridge. My initial thought was the smell must be external to the boat as we had a breeze in our face from running the boat over 10kts. Within a couple of seconds the alarms went off. I instantly throttled back to idle and ran below. The engine room was filling with water and a raw water hose had come off and was spewing water in.
Ran back to the console, steeled boat out of the ICW channel while cutting the engine and dropping the anchor (I think this all happened at the same time).
Ran back down to engine room, closed thru-hulls and assessed the situation.
Had about 8" of water, and the hose that had come off was the raw water to the oil cooler exchanger, which also feeds the dripless prop shaft. The hose clamp was missing. The bilge pumps had been doing their job. The water never got to the high-water pump.
I refastened the hose with a new hose clamp and restarted the engine. I observed for a few minutes in the bilge and things seemed "ok". We were within a mile of home so I idled the boat back.
After pumping out the bilge (beyond what the bilge pumps get) I found the broken hose clamp; it had snapped in half at a point where there was some noticeable corrosion on the stainless steel.
This boat is new to me (only had it a few months) and I hadn't done the do-diligence of checking all the hoses & clamps. When we bought the boat, we motored it home from the mid-Florida East coast to the mid-Florida West coast, taking it around the bottom of the state. We were lucky on that trip because I didn't have spare clamps on board, or even tie straps.
In addition, the hose that had come off only had a single clamp on the end that failed even though the other end was double clamped.
I don't need to ramble about the lessons learned here, as they are obvious.
I checked my tranny oil and it is up, clear and not smelly. Any ideas out there as to what I would have been smelling when the alarms went off? I don't see or smell and issues now. Surely something that got hot enough to smell on the flybridge while underway at speed must have caused some damage somewhere. Any ideas where I should look? At slow speeds (I haven't gone beyond idle since) there doesn't appear to be anything wrong. All temps, etc., are within normal ranges.
Any input appreciated. Thanks!
While running for about a minute at just over 3000rpm (we have a Mainship 34 Trawler with 370hp Yanmar) my wife and I could smell burning while sitting in the flybridge. My initial thought was the smell must be external to the boat as we had a breeze in our face from running the boat over 10kts. Within a couple of seconds the alarms went off. I instantly throttled back to idle and ran below. The engine room was filling with water and a raw water hose had come off and was spewing water in.
Ran back to the console, steeled boat out of the ICW channel while cutting the engine and dropping the anchor (I think this all happened at the same time).
Ran back down to engine room, closed thru-hulls and assessed the situation.
Had about 8" of water, and the hose that had come off was the raw water to the oil cooler exchanger, which also feeds the dripless prop shaft. The hose clamp was missing. The bilge pumps had been doing their job. The water never got to the high-water pump.
I refastened the hose with a new hose clamp and restarted the engine. I observed for a few minutes in the bilge and things seemed "ok". We were within a mile of home so I idled the boat back.
After pumping out the bilge (beyond what the bilge pumps get) I found the broken hose clamp; it had snapped in half at a point where there was some noticeable corrosion on the stainless steel.
This boat is new to me (only had it a few months) and I hadn't done the do-diligence of checking all the hoses & clamps. When we bought the boat, we motored it home from the mid-Florida East coast to the mid-Florida West coast, taking it around the bottom of the state. We were lucky on that trip because I didn't have spare clamps on board, or even tie straps.
In addition, the hose that had come off only had a single clamp on the end that failed even though the other end was double clamped.
I don't need to ramble about the lessons learned here, as they are obvious.
I checked my tranny oil and it is up, clear and not smelly. Any ideas out there as to what I would have been smelling when the alarms went off? I don't see or smell and issues now. Surely something that got hot enough to smell on the flybridge while underway at speed must have caused some damage somewhere. Any ideas where I should look? At slow speeds (I haven't gone beyond idle since) there doesn't appear to be anything wrong. All temps, etc., are within normal ranges.
Any input appreciated. Thanks!