How loud is a single cylinder Yanmar supposed to be? - SailNet Community
 
LinkBack Thread Tools
post #1 of 8 Old 04-01-2014 Thread Starter
Senior Member
 
Join Date: Aug 2013
Location: Jax, FL
Posts: 113
Thanks: 3
Thanked 3 Times in 3 Posts
Rep Power: 2
 
How loud is a single cylinder Yanmar supposed to be?

I was looking at another boat yesterday and it is has a Yanmar SB-8 motor. When it was first started it was really loud (banging noise not exhaust loud), and when the throttle was applied at certain times the banging was really loud, then quieted down in different throttle positions. First time ever hearing a diesel boat engine run so I don't know if anything was wrong.

The boat was on boat stands so we only had the motor run for 30 seconds max so I don't know if it would quiet down after it warmed up. It really seemed like the piston was slapping around a lot inside the cylinder wall but what do I know.

I am pretty positive that running the motor even for that 30 seconds was enough to fry the water impeller so i am planning on that first thing if we end up buying the boat.

Any help is appreciated.
Zac
Zac Penn is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 8 Old 04-01-2014
Just another Moderator
 
Faster's Avatar
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 16,518
Thanks: 104
Thanked 309 Times in 299 Posts
Rep Power: 10
     
Re: How loud is a single cylinder Yanmar supposed to be?

With covers off a single cyl diesel can be appallingly loud. We once installed a brand new Volvo one-lunger in my brother's boat.. when it first fired up I could've sworn the piston was hitting the head, it was such a metallic 'bang'.. but it was 'normal'....

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)
Faster is offline  
Quote Quick Reply Share with Facebook
post #3 of 8 Old 04-01-2014
Reward for lost Kraken!
 
hellosailor's Avatar
 
Join Date: Apr 2006
Posts: 11,447
Thanks: 5
Thanked 131 Times in 128 Posts
Rep Power: 11
   
Re: How loud is a single cylinder Yanmar supposed to be?

Zac, I've only been up close to a one-banger on one boat, and my reaction was pretty much like yours: Hey, is that engine going to blow?

When in doubt...get a diesel mechanic, or put some money into an escrow account for 90 days to make sure it keeps working, as a "warranty" amount.

Remember that internal combustion engines, all of them, work by creating a series of explosions, and explosions sometimes may seem violent and noisy when they're planned properly.
hellosailor is offline  
Quote Quick Reply Share with Facebook
post #4 of 8 Old 04-01-2014 Thread Starter
Senior Member
 
Join Date: Aug 2013
Location: Jax, FL
Posts: 113
Thanks: 3
Thanked 3 Times in 3 Posts
Rep Power: 2
 
Re: How loud is a single cylinder Yanmar supposed to be?

Oh, thank you both for the response. That really sets me at ease because it is exactly how you describe it. I thought the piston was smacking the head but I guess it is just loud. It wasn't scary loud and nothing really seemed to be rattling around so it seems like it is normal.
Zac Penn is offline  
Quote Quick Reply Share with Facebook
post #5 of 8 Old 04-01-2014
Member
 
Join Date: Feb 2012
Location: Jasper, Texas
Posts: 33
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Re: How loud is a single cylinder Yanmar supposed to be?

I have a Yanmar 1GM10 that is a single cylinder. It isn't quiet, but I never thought it was excessively loud either. Sweet little motor. If you go to You Tube and type in "Yanmar SB8 on Sailboat" you can watch and hear one run.
Kenn43 is offline  
Quote Quick Reply Share with Facebook
post #6 of 8 Old 04-01-2014 Thread Starter
Senior Member
 
Join Date: Aug 2013
Location: Jax, FL
Posts: 113
Thanks: 3
Thanked 3 Times in 3 Posts
Rep Power: 2
 
Re: How loud is a single cylinder Yanmar supposed to be?

Thanks for the suggestion. This motor is very similar to the sound it was making...
https://www.youtube.com/watch?v=Drk8O8DPF04

It was like the piston was slapping the walls but I guess it is an okay sound?
Zac Penn is offline  
Quote Quick Reply Share with Facebook
post #7 of 8 Old 04-01-2014
Remember you're a womble
 
PaulinVictoria's Avatar
 
Join Date: Aug 2009
Location: Sidney, BC
Posts: 2,101
Thanks: 10
Thanked 54 Times in 52 Posts
Rep Power: 6
 
Re: How loud is a single cylinder Yanmar supposed to be?

Sounds just like 'lil thumper in my boat
1GM10

Orange Crush
1974 C&C27 MkII

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
PaulinVictoria is offline  
Quote Quick Reply Share with Facebook
post #8 of 8 Old 04-02-2014
Senior Member
 
boz86's Avatar
 
Join Date: May 2012
Location: Maryland, US
Posts: 162
Thanks: 7
Thanked 3 Times in 3 Posts
Rep Power: 4
 
Re: How loud is a single cylinder Yanmar supposed to be?

The single cylinder we had made a distinct sound. The old farmers used to talk about the one-cylinder John Deere they called the Poppin' Johnny. Perfect description.

Since there's no other cylinders the one firing really stands out, esp at lower rpms.

Sailing "Horizons," a Hunter 31, from the Middle Chesapeake around Solomons Island.
I can keep a secret, it's the people I tell who can't.
boz86 is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
yanmar single cylinder gm10 engine chris c Crew Wanted/Available 2 10-13-2012 06:06 PM
Loud knocking with black smoke - Yanmar 70 dillybar General Discussion (sailing related) 6 06-13-2011 09:27 PM
Cylinder head for yanmar sb 12 RepDom Gear & Maintenance 4 06-14-2010 03:46 PM
My yanmar yse8 sounds loud. ocbew Diesel 16 06-14-2010 09:29 AM
yanmar three cylinder edwinh Gear & Maintenance 2 08-31-2007 12:46 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome