86 Ski Supreme overheating |
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Young545 ![]() Newbie ![]() Joined: July-06-2024 Location: Indianapolis In Status: Offline Points: 17 |
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My 86 Ski Supreme has a PCM 350 ( engine tag PLH WR L10 ) was running great and suddenly started to overheat. I allowed it to cool completely. I checked the water inlet under the boat and the hoses. Started the engine and it stayed at 100 degrees for 3,5 minutes then started to climb fast. Is the thermostat right in front of the carb? Thought I read 143 degree for new thermostat. Any thoughts on starting out much appreciated.
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fanofccfan ![]() Platinum Member ![]() ![]() Joined: December-13-2009 Location: North Bend NE Status: Offline Points: 1769 |
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If you are getting water through initial screen and trans cooler and on to the Raw water pump then the impeller might be need to inspected and or replaced.
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2004 196 LE Ski 1969 Marauder 19 1978 Ski
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Young545 ![]() Newbie ![]() Joined: July-06-2024 Location: Indianapolis In Status: Offline Points: 17 |
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Thanks. Best way to check for water? Remove and inspect supply hose to raw water after running? Is the plug on top of the main pump a water outlet i could check?
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MrMcD ![]() Grand Poobah ![]() ![]() Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3733 |
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Raw Water Pump is an external belt driven pump. Pulls water from the bottom of the boat and supplies all cooling to your marine engine. There is usually a filter on the supply hose. Raw Water Pump impellers usually last no more than 3 years in my area before they either fall apart or get stiff and no longer suck water up properly. Each pump design has its own unique impeller. They are usually around $35 and take a 1/2 hour to install. If you have never replaced one study up you want to get it right. When you pull yours apart make sure all the blades are intact. Many times blades peel off and will go into your cooling hoses and plug those. Don't stop chasing the lost parts till you have them all and could reconstruct your old impeller. Lost pieces cause overheats later so take the time and find them. Flush hoses clean after removing them.
Your thermostat at 143* is proper for a Marine Carbureted engine. It is possible your thermostat stuck and caused your overheat. Never hurts to replace it if you want a reliable engine. If you are new to the boat a new impeller is good insurance for the next two years.
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Young545 ![]() Newbie ![]() Joined: July-06-2024 Location: Indianapolis In Status: Offline Points: 17 |
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Thankyou for the info. I will post what I find,
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KENO ![]() Grand Poobah ![]() Joined: June-06-2004 Location: United States Status: Offline Points: 11015 |
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If you pop that housing off, right in front of the carburetor just like you said, you'll find the thermostat.
Being an 80's PCM Chevy you should find a physically big thermostat under there. The part number is RP026003 and it carries a big price tag too. Let's just say 100 plus bucks. These days it a 170 degree that they sell you, the 143 isn't available. There's a kit that replaces the thermostat housing so that you can use the automotive style thermostat that's smaller, a lot cheaper and easier to find. It uses a PCM R026002 thermostat. The kit is RK025026. Not so easy to find the kit. Cross your fingers and hope that the original housing was replaced in the past with the kit but that looks like the old housing that takes the big thermostat. ![]() I'd google both thermostat numbers to compare pictures to what you pull out, just to be sure you know what you have. Post pictures to show what you have. The raw water pump is a Sherwood G55-2 and the impeller is Sherwood part number 10615K available at lots of places. I'd at least get a look at the thermostat, test it in boiling water and take the pump apart to inspect/replace the impeller if you don't know when either was last changed, along with the hose inspections etc. mentioned earlier |
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Young545 ![]() Newbie ![]() Joined: July-06-2024 Location: Indianapolis In Status: Offline Points: 17 |
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Thanks for the great info. I’ll let you know how it goes.
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MrMcD ![]() Grand Poobah ![]() ![]() Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3733 |
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You have many great tips to follow above. |
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Young545 ![]() Newbie ![]() Joined: July-06-2024 Location: Indianapolis In Status: Offline Points: 17 |
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Again thanks guys for the good info. Checked transmission cooler and it looked fine. Pulled the thermostat and it opened with the boiling water test.Pulling the impeller tomorrow. Already have new thermostat and impeller ordered. Will post a update.
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KENO ![]() Grand Poobah ![]() Joined: June-06-2004 Location: United States Status: Offline Points: 11015 |
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Got a picture of the thermostat?
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Young545 ![]() Newbie ![]() Joined: July-06-2024 Location: Indianapolis In Status: Offline Points: 17 |
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Took off the pump today and the impeller is mostly gone. So I know to check hoses. Remove main pump? Engine inspection? I’m at the cottage on phone and can’t figure sending pics yet. I’m
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fanofccfan ![]() Platinum Member ![]() ![]() Joined: December-13-2009 Location: North Bend NE Status: Offline Points: 1769 |
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Start by replacing the impeller. Then look downstream of the raw water pump for chunks of old impeller. Or do like most and hope they went on through.
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2004 196 LE Ski 1969 Marauder 19 1978 Ski
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MrMcD ![]() Grand Poobah ![]() ![]() Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3733 |
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When the impeller is gone the boat will overheat badly. Pull the thermostat and with the raw water pump open you can use a hose and back flush the hose to the RWP to clear that side. There should not be any pieces in the inlet side of the RWP. Usually, the pieces get trapped up by the thermostat housing, but some will get into your exhaust, so those hoses need to be removed and flushed plus give it a good eyeball into the exhaust water cooling inlet.
If you have a new impeller, you can see how it is supposed to look. Gathering the pieces you can tell when you could put it back together like a puzzle. A buddy did this when we were on a 4-day camping trip. Our beach had no drive in access except by boat. Because this was wrecking his vacation, he kept trying to shortcut it and kept overheating till he finally pulled every hose and got all the chunks recovered. Best of Luck, hope you find them without too much trouble. Almost all of the impeller pieces were at the thermostat housing and at the inlet to the exhaust manifolds in his boat but some chunks can stick inside the hoses adding to your fun. Since then, his wife keeps track of how old the impeller is and REMINDS him frequently what happens when he does not change it on time. Never dry start the engine, the Raw Water Pump is lubricated by the intake water. Dry starts kill the RWP impeller super-fast. Look into adding a TimmyT for running the engine on the driveway. Makes the water hook up really easy. (I admit, before leaving for the lake I will turn my key just long enough to see if the starter is turning with full battery strength or if I have a problem. In my boat sometimes this quick battery check is enough for the engine to try and start. I switch off quickly and hope all is OK. Yes, I know I should not do it this way, but I hate finding a dead battery on the boat launch.)
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KENO ![]() Grand Poobah ![]() Joined: June-06-2004 Location: United States Status: Offline Points: 11015 |
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Main pump....if you mean the circulating pump, nobody really checks that. If chunks got in there, they then make their way into the engine cooling passages, then you'd have to tear the engine apart and look in all the cooling passages Engine inspection.....mentioned above, you'd be tearing it apart. Look at the 90 degree inlets to both exhaust manifolds. Unscrew them and make sure there's nothing lodged in the fittings or in the manifolds. And the suction side of the pump can also have pieces there, unlikely as it might seem. So kinda like fanofccfan said, slap in the new impeller after a few checks for pieces and give it a shot Phone pictures ....you need to use IMGBB or some other photo hosting site. QUOTE=KENO]
And added this link to the You Tube video that Larry made so there are written instructions and a video showing how to do it. Written and video instructions all in one spot ![]() Good idea Marty |
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Young545 ![]() Newbie ![]() Joined: July-06-2024 Location: Indianapolis In Status: Offline Points: 17 |
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Here is the bad news, I removed and flushed all hoses, Ran water thru the main pump, Have not foun much impeller parts. Awaiting impeller.
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Young545 ![]() Newbie ![]() Joined: July-06-2024 Location: Indianapolis In Status: Offline Points: 17 |
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Forgot the most important pic.
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KENO ![]() Grand Poobah ![]() Joined: June-06-2004 Location: United States Status: Offline Points: 11015 |
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Well no wonder it overheated, it's a hawt lookin' Supreme
![]() I see it has the big, old, expensive thermostat. Did you remove the elbows at the front of the manifolds to get a look at the elbows and the entrance to the manifolds About all you can do now is put things back together and take it for a spin and keep an eye on temperature. And make sure the suction and discharge hoses are on the right pump connections, otherwise it won't pump any water and you'll destroy your new impeller. You'll most likely be just fine. |
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MrMcD ![]() Grand Poobah ![]() ![]() Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3733 |
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Those pieces are in your cooling system somewhere.
I would pull the exhaust cooling hoses like Ken Mentioned and search for more pieces, you can look into the exhaust cooling inlet with the hose off and blow water back through the hoses. towards the pump while they are off. If water does not want to flow freely you might run a long wire through to help purge your pieces of impeller. You are apart now, just a little more time and you will know it is clean where you inspected. You should be back up and running soon. If your new impeller is correct and fits order a spare now and keep it in the boat. I have not needed my spare yet but have shared it with other boaters a couple times while out on a lake somewhere.
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Young545 ![]() Newbie ![]() Joined: July-06-2024 Location: Indianapolis In Status: Offline Points: 17 |
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Thanks for all the info.Had to go home. Have the parts next week. Will give you guys a update.
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Young545 ![]() Newbie ![]() Joined: July-06-2024 Location: Indianapolis In Status: Offline Points: 17 |
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Do I need to precharge hoses with water before starting?
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MrMcD ![]() Grand Poobah ![]() ![]() Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3733 |
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Hook up water, turn it on, start the boat.
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Young545 ![]() Newbie ![]() Joined: July-06-2024 Location: Indianapolis In Status: Offline Points: 17 |
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Ski Supreme back up and humming!!! Big thanks to KENO, MrMcD, and fanofccfan for all the help. I changed the impeller and decided to reuse the old thermostat since it tested ok. I cut off the ends on 3 hoses as they were splayed and cracked. Started right up and stayed around 150. Thanks again for taking care of a newbie.
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fanofccfan ![]() Platinum Member ![]() ![]() Joined: December-13-2009 Location: North Bend NE Status: Offline Points: 1769 |
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Good news!
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2004 196 LE Ski 1969 Marauder 19 1978 Ski
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MrMcD ![]() Grand Poobah ![]() ![]() Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3733 |
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The first Lake test will confirm if your boat is ready to go. Pay close attention to the temp the first outing. Good Luck.
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