I have a rebuilt 1984 115HP I6 which ran very fine last year. This year - after my second trip out, she starts to idle rough. I checked and found that the stator was dead. Today, I replaced the stator, did a link and sync and
fired her up. She was as usual not easy to start, but not worse than normal. She ran a little rough, but it inproved after a few minutes. I let her warm up, all the time making sure she would not exceed 1500 RPM. She is in the marina, in the water, so she had plenty of water all the time. I then proceded to adjust the idle and make her run at about 800 RPM on idle out of gear. But she would nok run as smoth as before. So I decided to check if there was spark on all six - there was. All plugs are wet and
oily - all looking the same Then all of a sudden, she starts making a terrible knocking sound - kind of reminding me of two years ago when #2 piston melted. I immediately shut her down. A bit shocked, I decided to do
a compression test - all exept #3 read 120 PSI. #3 read - nothing. The needle barely moved at all. So now, the $10000 question - what happened? We have good quality fuel here in Norway, so nobody uses decarb - I am not able to get it anywere here. And there is no problem with carbon build-up in the engines. So I guess a stucked ring is not an option. Do you guys have any hints of what to do now? Do you think I have to tear her down again? Is there anyway to inspect the #3 piston / cylinder without opening her up?
-M-
fired her up. She was as usual not easy to start, but not worse than normal. She ran a little rough, but it inproved after a few minutes. I let her warm up, all the time making sure she would not exceed 1500 RPM. She is in the marina, in the water, so she had plenty of water all the time. I then proceded to adjust the idle and make her run at about 800 RPM on idle out of gear. But she would nok run as smoth as before. So I decided to check if there was spark on all six - there was. All plugs are wet and
oily - all looking the same Then all of a sudden, she starts making a terrible knocking sound - kind of reminding me of two years ago when #2 piston melted. I immediately shut her down. A bit shocked, I decided to do
a compression test - all exept #3 read 120 PSI. #3 read - nothing. The needle barely moved at all. So now, the $10000 question - what happened? We have good quality fuel here in Norway, so nobody uses decarb - I am not able to get it anywere here. And there is no problem with carbon build-up in the engines. So I guess a stucked ring is not an option. Do you guys have any hints of what to do now? Do you think I have to tear her down again? Is there anyway to inspect the #3 piston / cylinder without opening her up?
-M-
