Hey all,
If you happened to catch a post I had a month or so, I purchased a boat that had a bad motor. I swapped the powerherad and finally got around to tearing down the seized one. First off i gotta say, "I love these motors". Entire teardown went faster than most other motors I have rebuilt and not one broken bolt. (sure beats my last Suzuki lol.)
Unfortunately the motor had sat for a few months before I purchased it, so I didn't get a chance to see it freshly after it froze. As far as condition, the lower two cylinders/pistons were oil free and dry and rusty. The upper two were perfect, including a nice coat of oil. The upper rod bearing on one of the lowers (not at home- forget which one) had come apart and is the reason for the failure. The case was good except for one of the journals that had some scraping from a loose bearing. The crankshaft was dry on the lower two cylinders but had a heavy pool of lubrication at the lower bearing/main seal. Heavy scoring on one of the lower cylinders from a bearing and moderate on the other. The thermostats --one was tested o.k., the other was stuck mostly open.
My question is this. From the above (will try to post photos later) is there a most likely cause? Overheat? lubrication (premix motor though) , lean seizure? Vacume leak (lean seisure)? Were the cylinders dry because they were on the exhaust stroke when it seized and not a result of it?
I really like my now running (same model) motor, but potential issues with all the balance tubes and vacuum lines scare me. My running motor is premix with a traditional high volume pump feeding the original vro pump (minus the oil). Are there things you more experienced with this motor could recommend to simplify or improve on the intake side of the motor? Is there anything I should retrofit/replace that are known to fail. As easy as these are to tear apart, I would hate to have to loose a bunch of time and money doing it.
Thanks,
Dave
If you happened to catch a post I had a month or so, I purchased a boat that had a bad motor. I swapped the powerherad and finally got around to tearing down the seized one. First off i gotta say, "I love these motors". Entire teardown went faster than most other motors I have rebuilt and not one broken bolt. (sure beats my last Suzuki lol.)
Unfortunately the motor had sat for a few months before I purchased it, so I didn't get a chance to see it freshly after it froze. As far as condition, the lower two cylinders/pistons were oil free and dry and rusty. The upper two were perfect, including a nice coat of oil. The upper rod bearing on one of the lowers (not at home- forget which one) had come apart and is the reason for the failure. The case was good except for one of the journals that had some scraping from a loose bearing. The crankshaft was dry on the lower two cylinders but had a heavy pool of lubrication at the lower bearing/main seal. Heavy scoring on one of the lower cylinders from a bearing and moderate on the other. The thermostats --one was tested o.k., the other was stuck mostly open.
My question is this. From the above (will try to post photos later) is there a most likely cause? Overheat? lubrication (premix motor though) , lean seizure? Vacume leak (lean seisure)? Were the cylinders dry because they were on the exhaust stroke when it seized and not a result of it?
I really like my now running (same model) motor, but potential issues with all the balance tubes and vacuum lines scare me. My running motor is premix with a traditional high volume pump feeding the original vro pump (minus the oil). Are there things you more experienced with this motor could recommend to simplify or improve on the intake side of the motor? Is there anything I should retrofit/replace that are known to fail. As easy as these are to tear apart, I would hate to have to loose a bunch of time and money doing it.
Thanks,
Dave