Hello all -
here, and a new boat owner. Though I've been sailing for 7 years, I was only crew until my recent purchase
of a Catalina
440. I'm hooked.
I have an issue that has come up however... Two weeks ago the boat had a fresh coat of bottom paint
applied. She was in dry dock
for about a month. After launching the boat the temperature gauge on the binnacle has been telling me that she's overheating
To my knowledge there are two different temp sensors on the engine
- one connects to this temp gauge and the second is the "dummy" alarm
that will sound if the engine
gets too hot. What happens when I run the engine is that the temp gauge will climb up to be pegged, and then periodically bounce between 180 degrees (normal operating temp) and maxed. The secondary alarm
never goes off. I have noticed a very small amount of red fluid in the catch basin underneath the engine (by small I mean about an ounce or less), that appears to be the same color as diesel
The engine is a Yanmar
4JH3-TE. I've never had an issue with overheating
until now. I've investigated a few things, but I should note that I am not skilled at diagnosing beyond the below, nor a mechanic
(though I am currently in the process of taking a marine diesel
and repair course locally to learn how to be more self sufficient).
1) checked that water
is correctly flowing out of the exhaust
vent, per normal.
2) checked that all the seacocks are correctly opened to allow water
to flow through properly.
3) ensured there are no obstructions in stainless raw water
4) checked coolant
levels, and added about 1/4 cup of fresh water
5) checked fittings to make sure they are tight... to my eyeballs and limited knowledge they look ok.
Some thoughts others have shared with me are that there may be an air bubble in the system that needs to be bled out, or that the temp gauge may have failed, but that everything is actually ok.
I intend to swap the temp gauge to see if that fixes things, since that is easy to do - I'll report back on whether that fixes it. Unfortunately I do not know how to bleed air out of the system, so if anyone has very instructive steps and pictures of how to do that I would be really appreciative. Also, if there are other things to consider I'd love to hear them.
Thank you all in advance,