We have been trying to figure out how saltwater is getting into our engine
and run out of ideas.
Isuzu 6BD1 engine
We removed the coolant/saltwater exchanger and took it to a shop for testing. No leaks
. Excellent condition.
We removed the coolant/oil exchanger and it was fine too.
A taste test of water
in the oil
pan = saltwater
A taste test of engine coolant
= no salt
One possible clue we thought was the slow loss of coolant
before this occurred. The boat
is run commercially now which mean I am not their to oversee it all the time. The mechanic
installed a gravity fed reservoir to the radiator. One strange guess I have is someone refilled that reservoir with saltwater instead of fresh.
However, I insisted on removing the reservoir and salt water
got into the engine oil
I just purchased a complete head gasket
kit since I thought the problem was coolant mixing into the oil. I am now concerned installing it would be wasted effort. We have no smoke issues with the engine and it sounds fine.
I had saltwater in the engine before, however, that was almost 12 years ago while crossing the Pacific in rough weather
. I am still not sure if that saltwater came up the exhaust
or through saltwater supply line to the engine which was open. I was paranoid after that and would close the saltwater supply line even at the dock
. That was fine while it was only myself starting the engine since I could be certain to open the supply line before starting the engine.
I never had saltwater in the engine since I began closing the supply line, however, I also have not been crossing the Pacific either.
The engine is mostly above the waterline. The saltwater mixing elbow
is above the waterline too. This said, the oil pan is below it.
Given the commercial
crew, I really worry about telling them to begin closing that supply line each time they shut the engine off. They could do a lot of damage if they forgot to open it if they were in a hurry.
The vessel has not been in any rough water
for over 2 years.
I hope this is enough information for someone to give me a clue as to what to do. My only thought is to review the current
procedure of opening and closing that saltwater supply line despite the fact I doubt it is the problem.