Tweet
Looking at the cylinder and crankcase schematic diagram for my motor, it appears that the thermostat is accessible by removing the screw, part #29, which should allow me to replace the thermostat and the gasket. I spoke with a tech @boats.net who said he believed the cylinder head cover needs to be romoved to access it. Can someone clearify this please?
-
-
Yes the cover will need to be removed to replace the thermostat. -
So at that point, I should plan on replacing the cylinder head cover gasket and pressure relief spring also?Comment
-
Yes, it is recommended you change the spring, but the gasket is a must.Comment
-
Thank you. You ***istance is greatly appreciated.Comment
-
While it looks like it is one screw holding the thermostat in place it is actually a plate. The plate is considered the cylinder head cover, but it is more like the cooling chamber cover. Taking off the cover will give you access to the thermostat ***embly. There are about 10 screws that you need to remove. I recently did this procedure on a 1991 20hp, and it was not a big deal. I didn't replace the thermostat switch at the time and now I have to go back and replace that part. Turns out the switch was my problem. When you have the cover off you can see if there is build-up of stuff in the cooling chamber and clean that part of the cooling system out which is nice. The switch is $32, if it's no big deal for you to buy it, it might be a good idea to replace that, too, considering if it goes bad you'll have to open it up again.
I replaced the spring and washer, too. I have to admit that not much can go wrong with the spring but considering the h***le of doing this procedure what's a few more bucks to have a fresh part in place...Comment
-
Thank you Neptune, that's my thought also. Open it once and as long as it's not cost prohibitive I might as well replace bad parts and what could go bad. I know nothing about how this motor was cared for except what the previous owner told me. He neglected to mention the crossthreaded spark plug so what else did he leave out...Comment
-
My thanks to you Neptune also. I am just starting to work on my 1983 25hp motor and it did appear that I would have to remove all the bolts but I wasnt sure. Now after reading your post it is self explanatory. What a pain in the keester to have to do all that, whereas if they would have just made the stat accessible the whole job might have taken 10 minutes. Now it looks like it will take at least an hour or more......if all goes right. Again thanks for your helpComment
Comment