Reply
 
Thread Tools Display Modes
 
Old 08-03-2013, 10:08 AM   #21
TF Site Team
 
Baker's Avatar
 
City: League City, Tx
Country: Texas
Vessel Model: Carver 356
Join Date: Oct 2007
Posts: 5,630
Quote:
Originally Posted by LarryM View Post
John,

Do you remember who did the work, or have a way to contact him? Boomarang still roars in the pilothouse.

Larry
I think I can dig him up. I'll let you know!
__________________
Advertisement

__________________
Prairie 29...Perkins 4236...Sold
Mainship Pilot 30...Yanmar 4LHA-STP...Sold
Carver 356...T-Cummins 330B
Baker is offline   Reply With Quote
Old 08-03-2013, 10:09 AM   #22
TF Site Team
 
Baker's Avatar
 
City: League City, Tx
Country: Texas
Vessel Model: Carver 356
Join Date: Oct 2007
Posts: 5,630
Quote:
Originally Posted by IslandEagle View Post
I have never used them, but these guys look likethey do exactly what you want:
Custom generator covers | Great Southern Insulation

Scott Welch
Island Eagle
Scott, that looks exactly like the material I had on mine.
__________________

__________________
Prairie 29...Perkins 4236...Sold
Mainship Pilot 30...Yanmar 4LHA-STP...Sold
Carver 356...T-Cummins 330B
Baker is offline   Reply With Quote
Old 08-05-2013, 10:56 PM   #23
Senior Member
 
bikeandboat's Avatar
 
City: Maumelle, AR
Country: United States
Join Date: Jan 2013
Posts: 106
Quote:
Originally Posted by amapola View Post
We have a 4.4 Westerbeke and yes it's loud. I'm sure the noise comes from the air intake which doesn't have a silencer. Actually, it's just a hole in the head under the exhaust manifold and behind the solenoid. I've been thinking about fitting a pipe to this hole and installing a silencer.

I've got a question for you. Does your generator jump all around and shake while it's running? Mine does and I don't know if this is normal for this engine or it's a problem with my engine.
Yes, my 4.4 KW Westerbeke is loud, but it actually runs smooth, especially for a two cylinder diesell engine. You may need a mechanic to take a look at your fuel system.
bikeandboat is offline   Reply With Quote
Old 08-06-2013, 01:21 AM   #24
Guru
 
BruceK's Avatar
 
Join Date: Oct 2011
Posts: 7,561
Quote:
Originally Posted by CaptTom View Post
My Onan 7.5 is a real "tooth rattler". It's bolted to a piece of plywood that's screwed to the stringers. I'm convinced it would be much better if I had something in between to dampen the vibration. If I could reach all the screws without removing the genset, I'd like to just lift up the plywood and slide in a piece of rigid foam or something.
I suspect foam type sheet would be soon destroyed. Surely you need flexible engine mounts.
There is certain to be an Onan noise reduction cover to suit. Or make one, ensuring it is easily removed for servicing. Mind you,the front one is easy to remove, but top and side covers(rarely removed) are a PITA.
__________________
BruceK
Island Gypsy 36 Europa "Doriana"
Sydney Australia
BruceK is offline   Reply With Quote
Old 08-06-2013, 01:43 AM   #25
Guru
 
Edelweiss's Avatar
 
City: PNW
Country: USA
Vessel Model: 1976 Californian Tricabin LRC
Join Date: May 2011
Posts: 1,834
I will second that!!

I have an Onan MDJE 7.5 with Onan sound shield which is very quiet when buttoned up. Outside of the cabin you hear only the running exhaust water from the Aqualift muffler, which empties at the water line so no splash. Take one of the sound shield panels off though and you definitely know it's there.

I think the sound shield would make a big difference and if installed on shock absorbing motor mounts you will be much happier.

Larry B.
__________________
Larry B
Careful . . .I Have a Generator and I'm not afraid to use it !
Edelweiss is offline   Reply With Quote
Old 08-06-2013, 10:54 AM   #26
Guru
 
healhustler's Avatar
 
City: Longboat Key, FL
Country: USA
Vessel Name: Bucky
Vessel Model: Krogen Manatee 36 North Sea
Join Date: Oct 2009
Posts: 4,178
I've got a 4.5KW Northern Lights/ 3 cylinder Lugger crammed under my galley. There's no space for a sound shield. The unit runs smooth enough but neither the Admiral or I care for the sound level in the stateroom, so I've cut a new hatch in the veranda and am about to swap the genset to that position. I'll have the opportunity to manufacturer my own mounts and there should be space for a sound shield, although I'll likely try it without it first. First photo is me working on the unit as mounted below the galley, 2nd photo is of the completed hatch cut and lid before doing the teak work.
Attached Thumbnails
Click image for larger version

Name:	working down under.jpg
Views:	66
Size:	63.9 KB
ID:	21895   Click image for larger version

Name:	hatch and lid complete.jpg
Views:	55
Size:	75.5 KB
ID:	21896  
healhustler is offline   Reply With Quote
Old 08-09-2013, 06:11 AM   #27
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 16,515
I did just that a number of years ago. 2-71 generator I believe. The loudest one piece of pleasure boat equipment I have ever heard.

You havent been shipmate with an air cooled LISTER !!
FF is offline   Reply With Quote
Old 08-09-2013, 08:21 AM   #28
Guru
 
CaptTom's Avatar
 
City: Southern Maine
Country: USA
Vessel Name: Cygnus
Vessel Model: Prairie 36 Coastal Cruiser
Join Date: Dec 2012
Posts: 1,370
Quote:
Originally Posted by Edelweiss View Post
I have an Onan MDJE 7.5 with Onan sound shield which is very quiet when buttoned up.
I have the same genset with the Onan sound shield. I suppose it's not particularly loud, it just rattles & shakes the whole boat!

Mine has rubber motor mounts, but they don't seem to do the trick. I'm seriously thinking about trying to lift the whole base up an inch or so and slide in some rigid foam board.
CaptTom is offline   Reply With Quote
Old 08-09-2013, 11:33 AM   #29
Senior Member
 
IslandEagle's Avatar
 
City: Toronto & Nanaimo
Country: Canada
Vessel Name: Island Eagle
Vessel Model: DeFever
Join Date: Dec 2012
Posts: 232
Quote:
Originally Posted by FF View Post
You havent been shipmate with an air cooled LISTER !!
Best generator in the world. I grew up in a place with no power, we ran two 4KW Lister ST-1s, then I had an ST-2. A buddy of mine had an HR-6 with over 60,000 hours.

Scott Welch
Island Eagle
IslandEagle is offline   Reply With Quote
Old 08-09-2013, 12:20 PM   #30
Guru
 
Edelweiss's Avatar
 
City: PNW
Country: USA
Vessel Model: 1976 Californian Tricabin LRC
Join Date: May 2011
Posts: 1,834
[QUOTE=CaptTom;172351]I have the same genset with the Onan sound shield. I suppose it's not particularly loud, it just rattles & shakes the whole boat!
QUOTE]
-------------------------------
Sounds like you are feeling it, more than hearing it. That is a thirty plus year old generator and those motormounts may need replacing. The vibration is telegraphed into the boat through the stringers.

It is a diesel and you are going to feel vibration, but you may be able to eliminate some of the harmonic vibration by isolating the mounting plate from the stringers. But I have never felt the need to try it. Let me know how that works for you if you do?

Larry B
__________________

__________________
Larry B
Careful . . .I Have a Generator and I'm not afraid to use it !
Edelweiss is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 07:09 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012