Originally Posted by SVHarmonie
I have nothing definative, just some ideas, and need some more information...I know some of these questions will seem annoying, but these are the kinds of things I would look for if I was there:
When you say "in the engine" I assume you mean in the oil. Is there evidence of water anywhere else? Is there enough water to measurably raise the oil level?
After an oil change
how quickly does water appear?
You say your exhaust elbow is "above the water line," How high? and is there an additional loop in the exhaust line above that? Is there a syphon break anywhere in the system? Does the exhaust line dip below the water line anywhere at all? How old is the exhaust elbow? When was the last time it was removed?
Does the exhaust leave the hull
out the side, out the back?
I assume you have a water lock muffler
. Have you looked to see if it is full?
How much sailing is done compared to motoring? Water making its way back into the exhaust while the engine is running is ALMOST impossible.
Are you still loosing coolant
? Can you pressure test the coolant
system? The taste test isn't always definitive... Don't assume the head gasket is the only place for coolant to disappear. There are usually gaskets in the exhaust manifold jacket that separate coolant from exhaust that can fail too...
Thank you for your diagnostic help everyone.
I have come back to my vessel after the commercial
team operated the vessel on their own for several months. Getting valid information and wondering if you are being told the full story is difficult.
My engine has always suffered some minor coolant loss and I do know one of the hoses that was not changed last year has been replaced recently. I was shown the old hose and it was apparent that it burst. Therefore, YES, I do suspect that the engine overheated after the burst hose event.
Yes when I say in the engine I mean in the oil and water is accumulating in the oil pan. Enough that the oil level rises and we can draw out a water sample from below the oil. The mechanic
did the taste test on the saltwater removed from the oil pan. I will be going to the boat shortly to examine myself, however, am pretty confident he is telling the truth.
The head gasket kit contains way more parts
than just a head gasket. This is very interesting for me to see. I have not heard of possible coolant loss directly into the exhaust before. However, now that I see all these other gaskets it makes sense to me. Therefore, it is making sense to me to take the whole engine apart to solve the slow coolant loss since if that is a gasket it will only get worse over time.
In other words, I am concluding there are multiple issues I am dealing with..
#1 The slow coolant loss
#2 The consequence of what may have been an overheating
#3 The saltwater in the oil pan (BTW yes oil looks milky and I am now thinking of buying
a new oil pan because having saltwater in the oil pan will rust it out fairly quickly.)
Good idea on testing oil and coolant. I will look for testing kits or place that can test.
Saltwater appeared in the oil within a week of last oil change
The commercial operation is now almost 100% engine on and the foresail is just really for tourists to take pictures. Heeling is almost zero and I certainly am not flying a hull
. Further, I am in Langkawi bay with almost zero waves on a wide trimaran
. Therefore, I am thinking the only path for saltwater back in is back flow from the very tall exhaust loop. Which brings up an idea. There really isn't a big need for such a tall riser loop. Without any high seas here that could be safely reduced.
"I assume you have a water lock muffler
. Have you looked to see if it is full?"
Can someone explain this question to me. Are you suggesting I take it apart and look inside. It is a large stainless steel
anode protected round tank. Is it possible that after 20 years this tank is full of junk?
Exhaust exits out the side roughly a few inches above waterline.
"You say your exhaust elbow is "above the water line," How high? and is there an additional loop in the exhaust line above that? Is there a syphon break anywhere in the system? Does the exhaust line dip below the water line anywhere at all? How old is the exhaust elbow? When was the last time it was removed?"
Exhaust elbow is the term I am using for the point the seawater is injected into the exhaust. It is now 20 years old and has never been removed. It is about 4 inches above water line and has never been removed. I have seen the local welding shop making a new one for a different vessel and admit I wondered why.
From the injection point the exhaust line drops down to the base of the exhaust tank. At this point it is below the waterline. I have heard the term siphon break, however, I do not have one. I do not believe it is possible for a siphon to occur in the water I am in now.
I will look closely today at how high the exhaust is above the waterline.