Feelin Froggy
New Member
- Aug 6, 2013
- 29
- Boat Info
- 1983 270 Sundancer
1975 Fiber Form 19' Runabaout
- Engines
- 7.4 Merc
Need some help. Have 83 270 Sundancere w/ 7.4 Mercruiser. Bravo 2 outdrive. Have owned the boat about 2 months. Was told that the motor only had about 60-80 hours on it. Looks like it was just installed. While running the boat near WOT (4000 rpm's) the motor started to bog down. Rpm's dropped down to about 3500 rpm's without touching throttle. Acted like there was water in gas. This occurred about 2-3 times. I slowed the boat down and slowly raised rpm's again. Motor seemed to recover and ran for another 5 minutes with no issues. Then the motor made a loud bang like a backfire which was followed by a knocking sound. Wife was in the cabin and she said it smelled like burning rubber down below. Stopped boat, opened motor compartment,
no issue with belt, checked things over, nothing jumping out. Checked oil, still golden in color. Started motor again. Knockingnoise continues. Increases with Rpm's wether in gear or not. Motor still runs at 3500-3700 rpm's with no noticeable performance issues other than the knock. No increase in temperature, no change in oil pressure. Looking for advice on how to start troubleshooting where the issue stems from. I was planning to start by pulling each plug wire to see if I can determine which cylinder might be the issue. Any advice appreciated. Thanks
no issue with belt, checked things over, nothing jumping out. Checked oil, still golden in color. Started motor again. Knockingnoise continues. Increases with Rpm's wether in gear or not. Motor still runs at 3500-3700 rpm's with no noticeable performance issues other than the knock. No increase in temperature, no change in oil pressure. Looking for advice on how to start troubleshooting where the issue stems from. I was planning to start by pulling each plug wire to see if I can determine which cylinder might be the issue. Any advice appreciated. Thanks