Oil Cooler hose blow-off question


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North Carolina
Water Crafts
2010 Challenger 210 SE
1999 Sportster 1800 (Sold)
2001 LRV (Sold)
1996 SPX
When I winterized the boat, I took I too the boat ramp to warm the engines up. When I was finished, I pulled the boat to the top of the ramp, pulled the drain plug, and antifreeze (from what I would later figure out was the port engine) flowed out. Clean antifreeze (no oil). After troubleshooting, I figured out that the oil cooler hose was off. This must have happened while warming up the engines, as I had the drain plug out on the way to the ramp. The engine did not overheat. I was watching the temperatures as I warmed up the engines, and got them to about 150 degrees and shut them down.

So, my question is: Does the oil cooler outlet hose coming off indicate a mechanical failure that increased the pressure on the outlet side so much that the hose blew off? If so, what failed? The cooler itself? The water pump? Or, did I just have a loose clamp? I don't want to just clamp the hose back on if it's a symptom of a larger issue.


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