overheating

Alright I am going to start from the beginning because I am a total novice and need all the guidance I can get from you wise gentlemen on the forums. I'm gonna swallow my pride and be totally honest with all my boneheaded mistakes. I live down in San Diego and bought my first boat, a 1993...

I did preventive maintenance to change impeller myself - used non-OEM Sierra to replace previous Sierra impeller that lasted over 100 hours with no problems and no previous overheating. Boat alarmed (high temp) on 1st outing after changing impeller. Pulled belt and turned pump by hand and...

Hello, I have a 2002 300SD Sundancer repowered with 5.7 Mercruisers in 2020. the boat has a raw water Cooling system. This haul out i replaced both thermostat housings. after much searching, i installed the thermostat (160 degrees) in the housing in a different location than what was installed...

Hello! I just purchased a 2008 Sundancer 330, with two V-Drive, 8.1 L Mercruisers, water cooled. Today, at 3550, I heard a high pitch screech coming from the engine room. I immediately went to idle, and it stopped. Could not find anything wrong other than that noise, then at a lower pitch...

I'm having a problem with overheating and the engines going into "safe mode". It only happens over time when running pretty well full rpms. The temp gauges read 175 when it drops to guardian mode. I live 100 miles from any mercruiser dealer that can work on my boat. I replaced the water...

I have a 2006 290 SLX with twin 350 mag MPI motors with Bravo 1 drives. I recently developed an overheating issue that I cannot overcome. It began by running well while on plane but would overheat when I returned to idle (manatee zones). I was able to overcome this by backing down slowly on this...

Hello everyone I am new to this forum I am I am looking for any information on the piranha props and what 4 blade prop I should be using I have a 2008 Sea Ray 185 sport has the 4.3 190 horsepower I have seen some people use in 22 pitch and I have seen some people using the 18 pitch has has...

Whats up thread, I bought this 2005 Sea Ray 220Select w/ 5.0 MPI w/Bravo III outdrive last year from a family friend, awesome boat for the first summer, I had a cobalt dealer (nearest location) do the winterization of the boat because I am unskilled and wanted a professional to do it. Upon...

Hey Guys, I recently purchased a 2002 Sea Ray 185 Sport two months ago and I'm trying to troubleshoot an overheating problem. I purchased the boat without knowing ANY maintenance history as the boat was owned by a Cobalt dealer as a trade-in. The engine is a 4.3L Mercuiser MPI (Serial...

Overheating alarm on SeaRay Sundeck 220 I have 2010 SeaRay Sundeck 220 with a 5.0L MPI Engine. I keep going into an over temperature alarm when I am running 3,000 RPM and above. The alarm does not occur when operating under 3,000 RPM. Everything seems to check out fine. My water pressure is...

So both engines are not idling properly. Stbd One has to idle around 2000 and will stall out at 1500. Port engine will idle at 600 - 700 but overheat quickly at idle but maintain temp at around 1200 - 1500 rpm. Could timing be be an issue? Or the throttle be set wrong or even the fuel be too...

Hey all! I just acquired a 79 weekender 300 and have been tinkering with it so we can get it out on the water. Still a couple issues to sort out but figure I'll post and see what kind of solutions are out there. For her age she is in great shape except for the odd quirk which we are trying to...

This is the second time the transmission on my 2001 410DA has overheated to the point that the dipstick has melted. The first time was when it had only 10 hours on the boat in it's first year of operation. I only have about 500 hours on the boat now. Is there any PM that I can do on the...

Happy 4th to all, I am hoping someone can help me here. I have a 2002 Sea Ray Weekender powered by Mercruiser 5.0L MPI Bravo 3. When dewinterising I started it and it ran beautifully however could not get tempature to come down. It was approaching 190-200 and I shut it down. I replaced the...

I recently picked up a Pachanga 27. The boat has been in fresh water most of its life (Naples ME). I am using her on the Long Island Sound (salt water). When I put her in on Friday I ran her for about 3 hours, and she ran great. Other than a loose solenoid wire, which prevented her from...

We recently had impellers replaced on twin Merc 5.0s. Within 15 minutes into our first run after, both motors overheated within a minute of one another. After research we figured out there were some bad impellers (too small) on the market and the mechanic re-replaced and ran the motors for 25...

My 2008 310 raw water cooled (port side) engines has overheating problem. It started overheating only when operated at high RPM. I replaced the thermosat last week but now the temp starts to slowly climb up even I put the engine idle. The computer shows the water pressure normal (1.3 PSI). I...

Ok, so I just had my 320 shipped from MO to TX. The dealership that I bought it through serviced both engines (changed impellers), etc. When I first got it in the water and ran it, the cooling hose came off of port engine, smartcraft alarm went off after the the temp got up to 180ish and the...

This post is long overdue and I’m sorely in need of the advice of my fellow Sea Ray owners. Sorry it’s a little long, but I want to be thorough. Background: SEP ’09 - Purchased ‘04 260 Sundancer 350Mag B3 with verified 15 hours on engine. Boat was used in salt water, but equipped with fresh...

I have a 2001 280 DA w/ twin 4.3 Alpha Drives the starboard engine is running hot. When I took it in the service dept. said the engine was fine but the gauge is bad. The temp gauge is heating up faster than port but when running it will go to 0 and then back to 170 degrees+. The overheat...