Capt Kangeroo
Senior Member
Our boat sits for months at a time and prior to leaving it I run the engines and genny at the dock until each reaches operating temp. When I did this last visit everything seemed fine, the 3208 cats purred like kittens as did the Northern Lights 30kw genny.
This visit I fired the genny up and noted water spraying from the wet exhaust manifold. After shutting down and pulling it off I found it was very severely cracked on the exhaust side from the hose flange all the way up to the water connection. The crack had opened up nearly 1/4 inch and is twisted. ie: the two haves would not line up if you could somehow squeeze them back together. As well, the cooling water side also had a long hairline crack along its length. It looks exactly like one would expect if it had froze but this is impossible as it is in Florida.
Any ideas what may have caused this? It was definitely not leaking when I left, this is a huge crack and would have been very noticeable, what could make it split just sitting there? I have never seen it overheat and regardless of load it generally runs about 105F. Not sure what the temp spec is but I always check for cooling water flow immediately upon starting.
All thoughts welcome, thanks!
This visit I fired the genny up and noted water spraying from the wet exhaust manifold. After shutting down and pulling it off I found it was very severely cracked on the exhaust side from the hose flange all the way up to the water connection. The crack had opened up nearly 1/4 inch and is twisted. ie: the two haves would not line up if you could somehow squeeze them back together. As well, the cooling water side also had a long hairline crack along its length. It looks exactly like one would expect if it had froze but this is impossible as it is in Florida.
Any ideas what may have caused this? It was definitely not leaking when I left, this is a huge crack and would have been very noticeable, what could make it split just sitting there? I have never seen it overheat and regardless of load it generally runs about 105F. Not sure what the temp spec is but I always check for cooling water flow immediately upon starting.
All thoughts welcome, thanks!