4 posts / 0 new
Last post
sail_maine
Last seen: 2 months 4 days ago
Joined: 5/11/19
Posts: 2
Universal M25xp overheatings fixed... now no hot water??

So, motoring back from a great weekend a few days ago and our Universal M25xp starts overheating. I first noticed white smoke coming out of exhaust and looked down to see temp gauge at 160 degrees. Our engine never moves off 150 no matter the load. Pulled some seaweed out of strainer and off we went... only to start overheating again. I rolled back to 1500 rpm's and could somewhat keep the heat down as we limped back to our harbor. I check for any leaks at engine (none), checked impellor, checked exhaust/muffler for any restriction (didn't check elbow)...etc. Nothing. Went back and checked the strainer and ofund another strand of seaweed. Hmmmm. Started the engine up and motored for 1 hour at 2200 rpm's. Overheating solved. 45 minutes into running the engine my wife signals up... no hot water, it was lukewarm at best. I'm guessing the overheating is related to no hot water but the above scenario doesn't make sense to me. Thoughts?

Chachere's picture
Chachere
Last seen: 1 hour 39 min ago
Joined: 10/27/10
Posts: 597

Did you check the coolant (antifreeze) levels?   Possible the overheating could have cause some losses of fluid....

--

Matthew Chachère
s/v ¡Que Chévere! #466
1985 C36 MKI tall rig fin keel M25
Homeported in eastern Long Island, NY

sail_maine
Last seen: 2 months 4 days ago
Joined: 5/11/19
Posts: 2

Antifreeze levels are all good since beginning of season. I'm leaning toward the thermostat at this point.

Chachere's picture
Chachere
Last seen: 1 hour 39 min ago
Joined: 10/27/10
Posts: 597

Sometimes you can get a bubble of air in the top of the antifreeze loop, which must be bled out. 
Do some searching on the forum, you'll find some discussions on how to do this.

--

Matthew Chachère
s/v ¡Que Chévere! #466
1985 C36 MKI tall rig fin keel M25
Homeported in eastern Long Island, NY

Log in or register to post comments