Yanmar motor mounts versus the other sources - 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? 
  #1  
Old 11-14-2013
Member
 
Join Date: Sep 2010
Location: Boston area
Posts: 92
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
mbsl98 is on a distinguished road
Yanmar motor mounts versus the other sources

Before I knew any better (4 years ago, before SailNet fever) I had new mounts installed on my 3GMD, along with new shaft and cutlass (for excess play), etc. The main reason for the mounts was to reduce the fairly significant engine vibration at certain speeds. All work was done well, and has run well for the past 4 years and around 200 hours. However, the engine vibrations did not particularly change (not nearly as much as I hoped for). There is little to any visible movement of the engine at any speed, while vibrations are particularly bothersome at a couple of interim speed ranges that i would otherwise use a lot. I now usually avoid the 1600-2400 range for the most part, since it runs so much smoother below and above that, all the way to the absolute redline of 3600. As background, the motor has around 500 hours total time, and is in excellent condition including valve adjustments, etc. to be sure it is as smooth as possible.

I assume that part of the issue is that I don't have a lot of boat mass to absorb normal vibrations, being a 22 foot and 5600 pounds with motor right under foot under cockpit sole. However,I am still seeking ways to reduce the vibrations, and am thinking of another set of mounts, this time using Yanmar originals. The shop I used is very good, but not particularly a Yanmar shop, and I don't have the name of the actual mounts they used, but don't believe they were Yanmar parts. Anyway, a long way to get to my basic question: Are there really significant differences between thte usual after market mounts and the specific Yanmar items designed for the 3GMD? In other words, am I likely to see any noticeable change in vibrations felt through the boat. Also, is the fact that the motor seems to move/shake very little in current mounts a tell-tale of hard mounts? I have seen various YouTube videos of little diesels that seem to shake around quite a bit, and that is probably due to softer mounts that may or may not actually reduce the vibrations felt by passengers. My ignorance is showing here, but I would realy like to improve current levels, as that is the only single thing I don't particularly like in my boat, and I have to run several miles each way to reach open water, with a 4+ knot current to fight if I don't get the times right.

All thoughts greatly appreciated.
__________________
Mike sullivan
1985 Marshall 22 catboat
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 11-15-2013
casey1999's Avatar
Senior Member
 
Join Date: Oct 2010
Location: HI
Posts: 3,030
Thanks: 11
Thanked 32 Times in 31 Posts
Rep Power: 5
casey1999 is on a distinguished road
Re: Yanmar motor mounts versus the other sources

I have the same engine Yanmar 3GMD (20 HP).

In the next few months I will be replacing my original Yanmar mounts with new Yanmar mounts. I looked at some after market mounts, and they do not seem as robust as the Genuine Yanmar. So I will go with Yanmar.

Here is another thing to look for. The Genunine Yanmar mounts are different for the forward and rear mounts. The have a pound rating (moulded number in the rubber part of the mount). The non Yanmar mounts you have may not be the correct size. I would install Yanmar mounts and make sure they are correct size. Front (where belts are) should be 100 lb and rear 75lb.

Most boats will probably have a resonant vibration range where the boat vibrates a lot and engine rpm should be avoided. Your range seems wide, maybe it is the mounts.

Last edited by casey1999; 11-15-2013 at 05:48 PM.
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 11-16-2013
Member
 
Join Date: Mar 2008
Posts: 37
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
SawWhet is on a distinguished road
Re: Yanmar motor mounts versus the other sources

A friend of ours had a mount failure on his 20 Yanmar decided to go with after market mounts (price) mounts were suposed to be exact replacement not. Work involved to make them fit outweighed the cost .Went with OEM and replaced all 4 mounts in an afternoon with boat in the water no issues with alignment and no vibrations.Actually vibration was less than before failure.Suspectedthe mount was failing mode for some time.(was a rear mount)
Reply With Quote Quick reply to this message Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

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:

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

 
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
motor mounts timangiel Diesel 11 09-27-2013 09:50 AM
broken motor mounts bristol299bob Diesel 4 03-26-2013 09:54 AM
Replacing Yanmar Motor Mounts - anyone with 3rd party success? Beersmith Diesel 1 05-17-2012 05:32 PM
R&D (PYI) Motor Mounts for Yanmar jason3317 Gear & Maintenance 9 03-15-2010 07:46 PM
Motor Mounts on Yanmar DrB Gear & Maintenance 12 01-14-2010 07:26 PM


All times are GMT -4. The time now is 08:26 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.