Hi folks, I have recently purchased an evinrude as described above and it has been running like a bit of a dog. First thing I did was change the spark plugs...then cleaned out and rebuilt the carbs...then discovered she wasnt really firing right on the middle cylinder despite getting a good spark so took the head off her to find the gasket pretty much blown to bits and the cylinder head pitted quite badly where she has blown out.
So purchased a new head gasket and cleaned up the two surfaces as best as I could without scoring them in any way refitted the head gasket torqueing up in the correct sequence and to the correct torque of 18-20ft lbs. I took the advice I’ve seen online and avoided any type of gasketing compound (despite my gut feeling saying the pitted areas needed a touch around them) Fired her up this afternoon and she ran like a dream...for about 20 to 30 seconds then back to running like a dog. I think the gasket is passing water into the middle cylinder and effecting the mix to the point that it’s barely firing or not firing at all...I’d imagine I’m going to get told to check the compression on all cylinders which I do not have the pressure tester for .
So as the engine ran I was also able to observe water weeping out from the head gasket and running down the outside of the casing...I torqued to the recommended 20ft/lb and then because of this increased the torque to 21ft/lb (didn’t want to go higher as 21 even seemed beyond my comfort zone). So my question really is...
do I increase the torque?
do I use an instant gasket compound?
do I skim the head (though obviously this will increase the compression)
or do I need a new head ( in which case the engine will most likely be scraped )
Thanks in advance for any recommendations
So purchased a new head gasket and cleaned up the two surfaces as best as I could without scoring them in any way refitted the head gasket torqueing up in the correct sequence and to the correct torque of 18-20ft lbs. I took the advice I’ve seen online and avoided any type of gasketing compound (despite my gut feeling saying the pitted areas needed a touch around them) Fired her up this afternoon and she ran like a dream...for about 20 to 30 seconds then back to running like a dog. I think the gasket is passing water into the middle cylinder and effecting the mix to the point that it’s barely firing or not firing at all...I’d imagine I’m going to get told to check the compression on all cylinders which I do not have the pressure tester for .
So as the engine ran I was also able to observe water weeping out from the head gasket and running down the outside of the casing...I torqued to the recommended 20ft/lb and then because of this increased the torque to 21ft/lb (didn’t want to go higher as 21 even seemed beyond my comfort zone). So my question really is...
do I increase the torque?
do I use an instant gasket compound?
do I skim the head (though obviously this will increase the compression)
or do I need a new head ( in which case the engine will most likely be scraped )
Thanks in advance for any recommendations