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prowlersfish wrote: ↑Sun Jun 16, 2024 9:26 am
If the noise goes away when you raise the rpm, the cause could be a misfire or the dampener plate or both. They will aggravate each other. Even a slight miss can cause a noise. I have fixed many a transition noise issue with a carburetor adjustment.
Maybe 1000-1200 rpm?
As far as getting towed back to the marina, you have 2 engines and a bow thruster so...... But that's your call, not mine.
I'm wondering if 1000-1200 rpm is a bit aggressive for being still tied to the dock. I can probably limp back to the dock with one engine and the bow thruster. The marina will assist with their small tenders to help nudge if necessary. I just don't want to cause extra damage to the drive train.
As in my other post about the spark plugs, maybe replacing them, and cleaning the rotor/cap, might at least alter the noise so I'll know if I'm barking up the wrong tree.
I might just have to bite the bullet and open up the wallet and have a marine mechanic come and do a complete tune up. If that doesn't solve the noise issue at least the mechanic might be able to pin point the noise with a more experienced ear.
prowlersfish wrote: ↑Mon Jun 17, 2024 9:04 am
As far as 1000-1200 in the slip, I don't know your dock or line conditions, but would have no issue with mine. But have seen some I would not.
The dock is in tip top shape. Fairly new, professionally constructed with concrete slabs and a continuous rail for tying off. Fastened with galvanized ready rod about every 3 feet or so going all the way through the rail, then the spacer block and then vertical through 2 x 12's. Even though my boat is a 1985, it has been extremely well maintained over the years. No sign of any issues around the cleats. I not only have spring lines which would act as a back up, but I also have two extra lines running for and aft from the two midship cleats. However on this boat there is only the helm on the bridge. So I might feel more comfortable with an extra hand at the helm, while I check out the noise down in the engine room at such an increased RPM.
It would appear Big D and Prowlerfish were on the right track. I replaced the plugs, and cleaned up the rotor and the contact areas in the distributor cap. Both the rotor and the cap were burnt. They both cleaned up pretty good with some 320 grit wet/dry sandpaper though. I fired it up and put it in gear and low and behold the noise was gone.
So thanks guys for convincing me to focus on the running condition of the engine. I'll try and track down a new rotor and a cap. I might as well get two of each and do both engines. I should really see about getting a rebuilt kit for the carb and pull it apart and clean it up.
