We were cruising in the San Juan Islands
for several days and everything was working fine with a healthy exhaust
and temperature gauge down the middle, 170-180 degrees. Late one afternoon while anchoring
temperature gauge started climbing while also showing white steam from the exhaust
is an 1989 Catalina 36
with a Universal M-25XP engine
and is new to me so I have little knowledge of pre-existing issues.
First thing I tried was cleaning
the intake raw water
strainer which was kind of dirty so I thought that was that. Next day started motoring and after a few minutes engine started overheating
again. We were in a bad spot due to conditions and to cut a long story short anchored in the closest protected shore and called for a tow. Eventually got to Cap Sante marina in Anacortes. Another long story for another day.
After getting to a dock
I confirmed there was almost no water
coming from the exhaust through-hull, just steam.
Things I have tried since then:
impeller. Looks in good shape and is intact and flexible although pump
overall could be refreshed. Added some grease to center of impeller on cover side. I have an extra impeller but doesn't seem I can change it without a press. I have confirmed that water
does come out of the pump
however doesn't seem like it's a lot. Should the water volume increase with rpm
. I have the 3" Universal version. Took it apart and the section with the drain showed lots of zinc debris and blockage. Soaked it overnight in Coca-Cola. In the morning cleaned all the crud and ran lots of fresh water. There's now a good flow of water through every connection. Zinc is around 30% so needs to be replaced very soon as well as gaskets. No leaks
Exhaust. Unplugged the hose that takes raw water to the exhaust manifold and put a hose there. Run water and confirmed it flows well to the exhaust through-hull.
Refilled the system with coolant
and ran the engine for a while. Added coolant
again. Repeated a couple of times until coolant level stayed consistent.
There's is now water coming out of the exhaust when the engine runs, however it does look like less than normal. When water comes out, every 5-6 seconds, it gets sprayed out, does not stream.
If I idle the engine at 1000 rpm
and neutral the temp stays around 180F. However if the engine is under load the temperature starts climbing slowly but steadily and after you get to 190F steam starts to appear. Higher rpms will produce more frequent water discharge from the exhaust.
Any ideas appreciated! Mechanics are all at least a week out so I'd also love referrals to professionals that can help in the near future.Thank you!