The thermostat comes out by removing a O ring that is pushed into a groove around the round body of the thermostat. You might have to clean of rust to get to it. Spray some WD-40. After pulling the O ring out you can use some needle nose plyers to pull out the Thermostat. It might be a little hard to get out due to rust pile up but it will come out. Of course you will see which way it goes in when you pull it out but the round sensor side (with Springs) goes in last wth the front rounded part (valve) goes in first. Sort of like a spear!
I'm just adding this in case someone else has come across this issue and it it isn't the thermostat: Below about 2500 rpm, the engine runs at normal temperatures. If you go to WOT, dramatic over heating spike within a couple of minutes. Feeling the hoses, all of them are too hot to touch including the raw water tube pulling lake water to the pump. I had to idle around the lake this summer because I couldn't figure it out. Replaced both the thermostat and the raw water pump. No change. Looking through the service receipts of the PO, I can see mention of over heating a few times. He replaced the riser within the last few years and this boat is used only a few times in the summer. I suspected a fallen flapper valve. When I pulled the riser, sure enough, the flapper was not on the shaft. Wasn't sure if it had been purposely removed (as volvo penta apparently suggests and no longer supplies replacements) when the riser was replaced. I pulled the drive off to lube the universal joints check the gimbal bearing and replace the bellows. Sure enough, two melted blobs that were once a flapper valve (possibly two flappers?) were lodged into the exhaust ports on the out-drive. Impossible to see until the drive was removed unless you scoped it from the top of the exhaust tube. So, at higher rpm, the exhaust pressurized the water passages more than the water pump could, and actually displaced the water in the cooing system causing a spike in the heat. My next guess was a plugged exhaust manifold or a head gasket. This is obviously my over heating problem. Just winterized it and will wait until spring to put it all back together.
@@bloodsweatmoney9089 Yes, that was the exact problem. It's been together for a couple of month with lots of time on the lake. Now it does 4400 rpm @ 34 mph (with stabilizer and 4 blade prop) with no over heating issues and everything works as it should. Normally you'd catch this with regular maintenance when taking the leg off to lube the universal joints or replace the bellows. If you're long overdue doing that, the overheating could be from a fallen flapper blocking the outdrive exhaust ports. Look carefully when outdrive is off. I almost missed it.
Curious is this fixed the overheating issue few years back I had an over heating issue and it was the rubber impeller on the crank that deteriorated and fell apart replaced the impeller an it would run cool for the first 60-90min then over heat pulled all the water lines off of engine an found a piece of the rubber impeller blocking a water jacket on the intake manifold removed it and now it’s runs great and does not overheat but my temp gauge doesn’t come up at all. Thinking there might be a piece of impeller stuck in the thermostat
The thermostat comes out by removing a O ring that is pushed into a groove around the round body of the thermostat. You might have to clean of rust to get to it. Spray some WD-40. After pulling the O ring out you can use some needle nose plyers to pull out the Thermostat. It might be a little hard to get out due to rust pile up but it will come out. Of course you will see which way it goes in when you pull it out but the round sensor side (with Springs) goes in last wth the front rounded part (valve) goes in first. Sort of like a spear!
I'm just adding this in case someone else has come across this issue and it it isn't the thermostat: Below about 2500 rpm, the engine runs at normal temperatures. If you go to WOT, dramatic over heating spike within a couple of minutes. Feeling the hoses, all of them are too hot to touch including the raw water tube pulling lake water to the pump. I had to idle around the lake this summer because I couldn't figure it out. Replaced both the thermostat and the raw water pump. No change. Looking through the service receipts of the PO, I can see mention of over heating a few times. He replaced the riser within the last few years and this boat is used only a few times in the summer. I suspected a fallen flapper valve. When I pulled the riser, sure enough, the flapper was not on the shaft. Wasn't sure if it had been purposely removed (as volvo penta apparently suggests and no longer supplies replacements) when the riser was replaced. I pulled the drive off to lube the universal joints check the gimbal bearing and replace the bellows. Sure enough, two melted blobs that were once a flapper valve (possibly two flappers?) were lodged into the exhaust ports on the out-drive. Impossible to see until the drive was removed unless you scoped it from the top of the exhaust tube. So, at higher rpm, the exhaust pressurized the water passages more than the water pump could, and actually displaced the water in the cooing system causing a spike in the heat. My next guess was a plugged exhaust manifold or a head gasket. This is obviously my over heating problem. Just winterized it and will wait until spring to put it all back together.
Well any updates?
@@bloodsweatmoney9089 Yes, that was the exact problem. It's been together for a couple of month with lots of time on the lake. Now it does 4400 rpm @ 34 mph (with stabilizer and 4 blade prop) with no over heating issues and everything works as it should. Normally you'd catch this with regular maintenance when taking the leg off to lube the universal joints or replace the bellows. If you're long overdue doing that, the overheating could be from a fallen flapper blocking the outdrive exhaust ports. Look carefully when outdrive is off. I almost missed it.
Curious is this fixed the overheating issue few years back I had an over heating issue and it was the rubber impeller on the crank that deteriorated and fell apart replaced the impeller an it would run cool for the first 60-90min then over heat pulled all the water lines off of engine an found a piece of the rubber impeller blocking a water jacket on the intake manifold removed it and now it’s runs great and does not overheat but my temp gauge doesn’t come up at all. Thinking there might be a piece of impeller stuck in the thermostat
bro which way does it go
Which side goes up?
How do you remove the thermostat from the housing?