#1
IP: 67.84.45.30
|
|||
|
|||
Strange sound from an unknown location
After the engine was rebuilt and put back in the boat I am hearing this strange wroom wroom sound that seem to change with RPMs. Took below video with my cell phone but you can still hear it pretty clearly. Video is exactly 1 minute long. Would greatly appreciate if someone could give any clues as to where the sound could be coming from.
https://www.youtube.com/watch?v=nQiy...uYz7Ug&index=1
__________________
Catalina 30, 1977, #421 |
#2
IP: 71.118.13.238
|
|||
|
|||
Sounds OK
Val, sounds pretty normal to me. I didn't hear anything that sounded bad, just normal engine noises.
What are you hearing that worries you? You can isolate the noise using a screwdriver (plasticor wood end in your ear) and placing the tip in various places around the engine. May be alt noise you are hearing to. Dave Neptune |
#3
IP: 67.84.45.30
|
|||
|
|||
Quote:
__________________
Catalina 30, 1977, #421 |
#4
IP: 76.7.149.170
|
||||
|
||||
Was the boat in gear or in neutral? Dan S/V Marian Claire
|
#5
IP: 67.84.45.30
|
|||
|
|||
It was in neutral
__________________
Catalina 30, 1977, #421 |
#6
IP: 161.213.49.150
|
|||
|
|||
I hear a loping sound in the last ~ 10 seconds of the video the sigifiance of which I do not know.
TRUE GRIT |
#7
IP: 24.137.74.99
|
||||
|
||||
I looked at the earlier portion of the video and can't tell if your shaft is spinning...I was thinking it was not and truly is in neutral. Not sure if I hear something there or not but you could try removing the alternator belt and see if it goes away...might be accessory drive or alternator itself.
__________________
Mo "Odyssey" 1976 C&C 30 MKI The pessimist complains about the wind. The optimist expects it to change. The realist adjusts the sails. ...Sir William Arthur Ward. |
#8
IP: 67.84.45.30
|
|||
|
|||
Quote:
I will try mechanics stethoscope that I have somewhere. Edit: It was not in gear. Dont think the shaft was spinning.
__________________
Catalina 30, 1977, #421 |
#9
IP: 24.137.74.99
|
||||
|
||||
Try holding a piece of wood to the accessory drive pully as the engine is running. About a foot or so long and just put some pressure against the pulley and the belt turns it....if the sound changes it's there in the accessory drive. The more I listen to it is sounds like an alternator bearing....
Not much help, I know
__________________
Mo "Odyssey" 1976 C&C 30 MKI The pessimist complains about the wind. The optimist expects it to change. The realist adjusts the sails. ...Sir William Arthur Ward. |
#10
IP: 174.94.17.50
|
||||
|
||||
I heard "resonance" which I would gather is the reflected sound caused by the configuration of the engine room and vibration.
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Location of raw water strainer? | wristwister | Cooling System | 30 | 12-01-2013 11:15 PM |
WL Muffler location? | gfatula | Exhaust System | 1 | 10-08-2012 10:58 AM |
Video-What is this sound? | rpowers | Troubleshooting | 25 | 03-19-2011 08:49 PM |
Terrible sound when starting up! | dsimon1044 | Troubleshooting | 10 | 03-24-2010 09:53 AM |
grinding/ rythmitic sound | stefan | Troubleshooting | 5 | 12-01-2005 07:45 AM |