Bumping/Thumping Noise-Advice Needed - Page 2 - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
 Not a Member? 

Diesel This is a forum dedicated to diesel engines and their applicable accessories.


Reply
 
LinkBack Thread Tools
  #11  
Old 06-20-2011
Irrationally Exuberant
 
Join Date: Jul 2007
Location: Northern Virginia
Posts: 1,301
Thanks: 6
Thanked 6 Times in 6 Posts
Rep Power: 8
arf145 is on a distinguished road
I agree--if it isn't happening in gear at the dock, that makes drive train issues less likely. With mine, you could see the excessive movement in the shaft, and hear it, any time it was in gear.
__________________
Tom K

2000 Beneteau 331
Northern Chesapeake Bay

Ambition is a poor excuse for not having enough sense to be lazy ~ Steven Wright
Reply With Quote Share with Facebook
  #12  
Old 06-20-2011
FishFinder's Avatar
Senior Member
 
Join Date: Feb 2008
Posts: 139
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
FishFinder is on a distinguished road
Good to know it's probably not a drivetrain issue. On the muffler -- do they have baffles? I was under the impression they were just empty inside and were fairly foolproof. I could take the hoses off I suppose and look inside.
__________________
1980 S2 9.2A (30') in Anacortes, WA
Aux power 13hp Volvo MD7A
Reply With Quote Share with Facebook
  #13  
Old 06-20-2011
Faster's Avatar
Just another Moderator
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 14,745
Thanks: 69
Thanked 203 Times in 195 Posts
Rep Power: 10
Faster has a spectacular aura about Faster has a spectacular aura about Faster has a spectacular aura about
Your exhaust hose likely makes a big loop up under the cockpit or coaming before going to the exhaust fitting, in many cases this hose is not secured. As you pump the 'slugs' of water through that hose might be giving a 'kick'. This could be hitting the side of the cockpit well and those are the thumps you hear.

Our boat does this occasionally, but relatively quietly. If you can view the hose underway you'll know soon enough.... FWIW
__________________
Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Reply With Quote Share with Facebook
  #14  
Old 06-28-2011
FishFinder's Avatar
Senior Member
 
Join Date: Feb 2008
Posts: 139
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
FishFinder is on a distinguished road
Fixed it! The correct answer: a blockage somewhere in the raw water cooling was causing the white smoke and loud banging (which I believe was backpressure?). After testing the injectors (were fine), I decided to dismantle the entire exhaust system and clean the cooling passages. Reinstalled and smoke/banging were gone. Have run it for about 20 hours since and all is good ... or at least I am back to the old problems and no new ones.

Thanks for the responses.
__________________
1980 S2 9.2A (30') in Anacortes, WA
Aux power 13hp Volvo MD7A

Last edited by FishFinder; 06-28-2011 at 03:55 PM.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Advice needed Sixpoint General Discussion (sailing related) 11 05-05-2011 12:21 PM
Head Sail Leach Cover Thumping jayseadee General Discussion (sailing related) 2 06-28-2008 08:12 AM
Help! Advice needed. PalmettoSailor Gear & Maintenance 5 06-25-2008 04:48 AM
Advice Needed Please Paddy666 Learning to Sail 3 06-11-2007 10:21 AM
12v & 24v bus advice needed smilie Gear & Maintenance 1 04-25-2006 07:02 AM


All times are GMT -4. The time now is 01:15 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.