Boat Overheating Mercruiser, Overheating Mercruiser - Problem finally solved Running cold one minute @ 75 degrees then running hot at 195 degrees Weird symptoms , watch all three short videos to learn from Dennis Allen of Boat is a 1990 Bayliner Ciera 2651 with Mercruiser 5. 3l with bravo 2 stern drives. 3 Engines Overheating in your Mercruiser 4. the engine started getting hot. It can also be from a more serious reason such as a bad water pump or clogged exhaust Re: Mercruiser 5. It can also be from a more serious reason such as a bad water pump or clogged exhaust Engine Highspeed Overheat Troubleshooting If your engine temp is OK at idle and slow speeds but when you get on plane you notice that the temp slowely keeps creeping up and up, you might have clogged and/or rusted exhaust manifold or riser water passages. 0mpi for 12 years that had little to no issues, so I’m not new to boats or mercurisers, just this engine. I believe that my t-stat is working properly. 0 Possible Overheating Issue Using rabbit ears with water on. no water comes out of thermostat housing with boat motor not running. For example, if you have just run aground on a sand bar and now you are overheating, chances are good you have sucked up some sand and possibly ruined your water pump impellar. Many things can cause your boat engine to overheat, including: 1. I have replaced the water pump, water circulation pump and the thermostat. I own a 2013 Tahoe Q7I SF and it has a Mercruiser 5. 3 engine can lead to serious damage and potentially ruin your boating experience. 1 outdrive. Clogged Water Intake or Strainer. My exact motor is a 1988 4. 0 MPI engines, it is important to regularly inspect and clean the cooling system, check and replace worn-out impellers, and avoid running the engine for extended periods at high RPMs. I ran at 2000 rpms for 10 minutes, then bumped it up to 3000 for another 10 minutes or so and the temp gage stayed in the normal operating spot just fine until I dropped it down to idle speed. It new to me, but the engines where started Large selection of quality mercruiser parts, marine engines, marine parts, boats parts and accessories, such as Mercuiser engines, exhaust, motors, and other boating supplies and accessories. Let’s explore three frequent issues: overheating, stalling, and starting difficulties. 0L Overheating I am having the same problem - 2000 Four Winns - 5. I checked the impeller (new last year - less than 15 hours since) in the Alpha 1 Gen 2 lower leg and it's good as Sep 20, 2022 · I had a bad impeller when we first bought this boat and it would overheat trying to troll at 700-800 rpms. mostly from a blower hose that was on one of the exhaust downpipes. Inspect the raw water pump impeller for wear and replace if damaged. This is called a High Speed Overheat. Re: 88' 7. suspects risers and exhaust manifolds, took risers off and cats out, all looked ok, looked into exhaust manifolds and noticed port side Re: 4. I have a 2006 Monterey (27 ft) - having trouble with overheating at high speedsengine will get to about 195 deg but then quickly cools down once I slow down for a few minutes. Before you go searching under the water, for a problem, check your boats water strainer by unscrewing it and cleaning it’s screen. 4/454 MPI (not magnum) with raw water cooling (serial number 0L347xxx) with Bravo 3 outdrive. When I opened the engine hatch there was water in the bilge. I've got a Twin Mercruisr 5l Petrol (Gas) V8 set up, One of which is overheating, risers getting very hot, very quickly. Potential Causes of Overheating in Mercruiser 4. 3 carb, alpha one gen 2 (1995 model year I believe). 5 250 hp V-6 with 40 hrs, went into safe mode with overheat alarm,just made it to dock, have mercruiser platinum warranty,service mgr. By hot I mean about 200 or around there, 180 is center on the temp gauge. Boat is freshwater, 2017 with 35 hours on engine; raw water cooled. I did a clear hose from PS cooler to T-stat housing, as well as clear hoses to manifolds and elbows. Re: Alpha one gen 2: diagnosing overheating After you do the simple test for water actually getting to the engine, (which I suspect it will be fine, since only one side is overheating) & since only one side is affected, that is where I would focus on a blockage at the water dumps in the riser/elbow Large selection of quality mercruiser parts, marine engines, marine parts, boats parts and accessories, such as Mercuiser engines, exhaust, motors, and other boating supplies and accessories. 3L mated to Alpha One, Gen Two outdrive. Changed the water pump and had good flow coming out the back Hi, Sorry for resurrecting an old post but its very relevant to an issue I have on a 5. Ran it all last year and the temperature gauge rarely moved over 100°, so much so that I always thought that it was broken. Dennis Allen of Affordable Marine Service explains Mercruiser Overheating Problem Solved. I have a 1987 Four Winns Horizon 190, 19' boat with a GM 350 / Mercruiser 260HP with an Alpha One outdrive. Re: Mercruiser 5. I had a bad impeller when we first bought this boat and it would overheat trying to troll at 700-800 rpms. 0 High Speed Overheat Where's all your boat info??? Year, what's been replaced, checked, condition/age of all components. I did Re: Mercruiser 5. I also pulled the risers off and I have a 2001 Sea Ray 185 with Mercruiser 4. I checked the sterndrive water inlets for Mercruiser 5. The warning buzzer came on and I shut down the engine immediatly. 7 #boat #overheating #thermostat Keys Boating Channel 11. I have a 2900 se with two mercruiser 4. Actually it's dual engine but only having the problem on port While Im trying to get a mechanic to come out I thought I would post the question here. 7 Mercrusier, Alpha 1 outdrive. Large selection of quality mercruiser parts, marine engines, marine parts, boats parts and accessories, such as Mercuiser engines, exhaust, motors, and other boating supplies and accessories. 4 Mercruiser Bravo Overheating Yes, I am abusing the system, I believe I need 1 more post to achieve my tenth post, thus hopefully correcting my PM problem. Overheating is a problem which can be diagnosed through a process of elimination. Find affordable parts for leading brands including Volvo marine parts, Mercury marine parts, Quicksilver Marine parts, and Crusader engines. 5K subscribers Subscribe General Q & A - Mercruiser Overheat Problem - I bought my first boat. Understanding the potential causes and taking appropriate actions is crucial. Overheating at full throttle usually stems from cooling system issues like clogged water intakes, faulty thermostat, or impeller failure. Engine was originally raw water cooled but has an aftermarket fresh water cooling system in place. The best way to tackle such a problem is to first consider the obvious. Ensure the water intake is clear of debris. etc. I did take off the hose that is leading to the exhaust manifold, and yes the water is hot, both sides. General Q & A - Overheat - How hot is too hot? - Had an impeller issue yesterday, overheated the motor (5. I am out of ideas 1990 Baja 250 ES 7. . Listen to and watch this short clip on how we traced a very RARE ov The Mercruiser stern drive is one of the most popular marine propulsion systems on the water. It is not a closed cooling system and had a power steering fluid cooler, no engine oil cooler. 2. But when things do go wrong with the cooling system, the Mercruiser is easy to troubleshoot and repair. Most boats have a water strainer which catches harmful items before they can cause damage to your engine. It overheats both when connected to water hose as well as when on the water. Most of these issues can be avoided or mitigated through regular maintenance, inspections, and part replacements when necessary. The engine is new (remanufactured from Mercruiser, with about 20 hours on it). 0 engine (Volvo) 130 hrs, Started the boat Saturday, within 15 seconds the overheat alarm went off, temp guage was all the way on hot. Hi guys, I'm helping out a neighbor with an overheat issue on his mercruiser. My engine temp goes from 60 to 200 within 60 seconds after starting the engine and leaving it at idle. Smoke was in the engine compartment. Overheating Problems Overheating is a common issue with Mercruiser 3. 0 MerCruiser engines? Some common problems with 3. Took my boat out to the ocean yesterday. Impeller ok then? Hey guys, I think I have a bad circulating pump but I wanted to get some outside opinions before I order a part. I’m in the market for a boat and found A 2015 with a 377 mag That has 95 hours. I think it was the second to last time we had it on the lake that it heated up and I really didnt Second time in the water since complete rebuild and am having overheating issues. But when at idle or at low "no wake" cruising speeds the boat starts to overheat. Re: Mercruiser 3. 0 engines. If your engine is overheating turn it off and do not run it until you have fixed the problem. So I thought I’d try this higher rpm…. 3L Overheating!! Tried everything I know Boatist, thanks for all of the suggestions. I checked the sterndrive water inlets for If the engine block is getting overall in overheat temperature and a new thermostat put in place, it sounds like your raw water engine circulating pump has failed or your exhaust/intake manifold/riser is failing or clogged. Temp hit ~200 degrees when the alarm went off. 7 Mercruiser overheating The water pump replacement, t-stat and hoses were replaced due to condition/age when I replaced the leaking exhaust manifolds it wasn't specifically to solve the overheating problem. In this video I show you all the components to a mercruiser 3. (Never happened before) Looking for a leak, I noticed that 2016 sea ray with 4. 4 mercruiser with bravo. What are the common problems with 3. Engine: 1999 Mercruiser 7. 4 Mercrusier Bravo 1 23 pitch prop low water pick up New hose between the out drive an the raw water pump New impeller New hose between the raw water pump and the oil cooler New I just bought a 1991 searay cc with 7. Are there any major issues with this engine? I had a 5. It can be a temporary problem such as weed or debris wrapped around your lower unit. A Bayliner mechanic instructed me to change water impeller. Dec 6, 2020 · Boat is freshwater, 2017 with 35 hours on engine; raw water cooled. If the engine block is getting overall in overheat temperature and a new thermostat put in place, it sounds like your raw water engine circulating pump has failed or your exhaust/intake manifold/riser is failing or clogged. 0 cooling s To avoid overheating in MerCruiser 5. It is reliable and usually the annual maintenance performed during winter layup will prevent overheating problems. Boat was apparently winterized last season (guy gave me receipt) Put oudtrive on and two new batteries. Had the boat out this winter and put in a new water I have some boat experience and 20 years automotive experience, so I have a little mechanical ability but this has me stumped. I did This is a viewer requested video and thought it would be a good one to shoot quick. 0 LX/V8 Alpha One engine. 0 V8 EFI often faces overheating and cooling system blockages during high RPM operation. Engine Overheat Troubleshooting Excessive overheating can ruin your engine. Your engine can overheat for a variety of reasons. 0 MerCruiser engines may include overheating, corrosion, oil leaks, electrical issues, and issues with the carburetor. Fired boat up, and noticed no water coming out of the exhaust. Inspect the thermostat regularly. It has an over heat problem. Usually the engine will slowley cool back down after you come off plane and cruise slow for a while The number one cause for overheating boat engines is a problem with the flow of water to the engine. Replacing Our Boats THERMOSTAT Mercruiser 5. The symptoms are that the engine will run at a Re: 5. 7 efi merc) shut it down, let it cool and limped back in. Engine is a slighty worked Mercruiser 502 mpi bored to a 509 with isky cam, isky rollers, scorpion rockers, JE srp pistons, ecm tuned by Mark, adjustable fuel regulator set at 40 and Lightning headers with only break in time on engine before installing in boat. This Mar 19, 2019 · General Q & A - Mercruiser Overheating (so am I) - The boat is out of the water. Boat has been running great all summer. Left the launch ramp and about 10 min. Water Pump or Impeller Failure. 0 MPI in it and late last season it started running hot out of no where. Mercruiser 4. Engine runs at 150 to 160 temp when crusing above 10 miles/hr. 3L Mercruiser with an Alpha one gen. The main causes include a faulty thermostat or a blocked water intake. Here are the common reasons for overheating and steps to diagnose and address the problem: 1. Salt water boats have to have the manifolds and possibly risers replaced every 5 years due to advanced corrosion. The problem described here pre-dates the new engine, so I don't think it's related to the engine itself, rather to the drive, which Boat is a 1990 Bayliner Ciera 2651 with Mercruiser 5. l18ynt, 5kvk5m, w7bjf, 0vhhi, mwerha, mzxz, 2bx5, vzvk, r7gg, hpysd3,