Jayo02
Cadet
- Joined
- Jun 22, 2020
- Messages
- 22
Hello. This is my first post here but I have been using this forum as a resource for quite a while. Sorry if this is really long but I wanted to give you all the background on my current issue.
I bought a 2006 sundeck 240 with low hours. Like 35. 5.0 MPI (0W376849) with a bravo 3 (0W285424) First trip out this season the boat was running great. then impeller went. Before I knew what happened I overheated it pretty good. Melting the flappers, rubber exhaust boots, shift cable just to name a few. Pulled it out of the water and began tearing her down. Did a compression check and those seemed ok. 6 of 8 were at 150. 2 were at 135 at the time. So I put it all back together. Run her on muffs and all seems well. Then on the second trip of the season the engine seems weak. Promptly pull her back into the slip and begin investigating. Tried to restart her. It’s hydro locked and won’t turn.
another compression check; now those 2 cylinders are at 30psi. Head gasket is shot. Tear it down again. Replaced head gaskets. Now compression is 150 on all 8. Run her on muffs In the drive way over the next couple days. Changing the oil/ filters 6 times to purge whatever water made it’s way in. 3rd trip of season engine seemingly runs great. Then I hit an RPM limiter for over speed engine in neutral. Neutral safety switch is also melted
. Fix that. Which is where I am at now. Engine seemingly runs good but at higher rpms I get a knock sensor fault code. Then solid continuous beep. Then smartcraft informs me that the engine is now in guardian mode. My questions right now are
1 - does this mean the knock sensors need replaced? Or could this be a sign of something else eg. incorrect base timing or perhaps valves ?
2- would having a code reader from Rinda help me decipher what to do with this. And if so which would be better to have : the tech mate pro or the diacom PC program ?
Thanks for any responses/ help.
I bought a 2006 sundeck 240 with low hours. Like 35. 5.0 MPI (0W376849) with a bravo 3 (0W285424) First trip out this season the boat was running great. then impeller went. Before I knew what happened I overheated it pretty good. Melting the flappers, rubber exhaust boots, shift cable just to name a few. Pulled it out of the water and began tearing her down. Did a compression check and those seemed ok. 6 of 8 were at 150. 2 were at 135 at the time. So I put it all back together. Run her on muffs and all seems well. Then on the second trip of the season the engine seems weak. Promptly pull her back into the slip and begin investigating. Tried to restart her. It’s hydro locked and won’t turn.


1 - does this mean the knock sensors need replaced? Or could this be a sign of something else eg. incorrect base timing or perhaps valves ?
2- would having a code reader from Rinda help me decipher what to do with this. And if so which would be better to have : the tech mate pro or the diacom PC program ?
Thanks for any responses/ help.