I was given a 15r75c.I have no history of this motor.I have replaced the impeller,spark plug coils(because they were rusted an the laminations were swollen),spark plugs,and with the help of another forum member,rebuilt the carb.She runs great now.I also drained the gearcase,and found old brown oil.Nothing that would indicate any water intrusion.Compression is 90+lbs.My question to you is, should I attempt to change the head gasket?Or should I let sleeping dogs lay? I want it to be reliable,but I have heard here,that if a motor has been in salt water,getting head bolts off in one piece is iffy.I donot know if this motor has been in salt water.I did find some minor white stuff under the pump housing,which cleaned up easily.The only indication of rust was the spark coils.The head bolts are still painted green,and look to me like they have never been removed.To change or not to change...that is the question.Thank you.P.S. I have bought a original OMC repair manual for this motor,but it won't be here for atleast a week.
