Heads Up w/Impellers on Yanmar - 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
 Not a Member? 
  #1  
Old 08-11-2008
DrB DrB is offline
Senior Member
 
Join Date: Mar 2007
Location: New England
Posts: 966
Thanks: 0
Thanked 6 Times in 6 Posts
Rep Power: 8
DrB will become famous soon enough
Heads Up w/Impellers on Yanmar

Thought I'd pass along a potential info tidbit that I learned while sailing on my cousins boat a a few days back.

We motoring up to Annapolis because of the lack of wind and all of a sudden the motor stopped producing exhaust water and the exhaust went black. Emergnecy shutdown and then we went below to acertain the problem, while the wives rolled out the jib and saied the boat.

Sea strainer had some weeds in it so we cleaned it out, but we didn't think it was much. We restarted the motor and waited 30 seconds and no water. Shutdown the motor and checked the impeller. Everything looked fine, so I thought it was the muffler or mix elbow that was clogged.

To make a long story short, the impeller was actually shot. Although it had all of the vanes and looked good, the metal bushing had sheared away from the rubber so that while the impeller shaft was turning, the actual impeller was not. I would have never thought of this, but my cousin got the local Yanmar guy on the line and said what often happens is that sea water flow stops and without it the lubrication to the impeller vanes stops. Once the lubrication stops, it doesn't take much for the rubber piece to shear away from the shaft bushing. So while it looks fine, it is not. Even a small or momentary interruption to the coolant water flow can casue this according to the Yanmar rep.

Something to think about if you motor stops "peeing" out the back for any period of time.

DrB
Reply With Quote Share with Facebook
  #2  
Old 08-11-2008
Pamlicotraveler's Avatar
Senior Member
 
Join Date: Aug 2006
Location: Creedmoor NC
Posts: 555
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 8
Pamlicotraveler is on a distinguished road
Quote:
Originally Posted by DrB View Post
Emergnecy shutdown and then we went below to acertain the problem, while the wives rolled out the jib and saied the boat.
So the wives were able to sail when you couldn't....That's impressive.

Your point about the impeller is a good one. You don't want to wait until they break apart, or run the tngine for long enough to allow that to happen. If they weren't in such an awkward position to change I would change mine much more regularly. I don't know why they can't put the impellor access on the outside of the engine...
__________________
Twenty years from now you will be more disappointed by the things y%^&*.....oh never mind. 90% of the people on sailing forums already use that as their signature! I'm not a conformist.
Reply With Quote Share with Facebook
  #3  
Old 08-11-2008
DrB DrB is offline
Senior Member
 
Join Date: Mar 2007
Location: New England
Posts: 966
Thanks: 0
Thanked 6 Times in 6 Posts
Rep Power: 8
DrB will become famous soon enough
It's all relative.....

Quote:
So the wives were able to sail when you couldn't....That's impressive.
On my cousin's boat, I believe that often the case is when the sailing speed drops below 3 kts, the motor goes on. For this particular incident, since there was no motor, the only "alternative" was to use the sails to move the boat. So it's not that we couldn't sail, we couldn't sail "fast enough".

DrB
Reply With Quote Share with Facebook
  #4  
Old 08-11-2008
bruceyp's Avatar
Senior Member
 
Join Date: Aug 2006
Location: Red Bank, NJ
Posts: 118
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
bruceyp is on a distinguished road
I had the same experience on my Yanmar. Everything looked good at first but upon closer inspection the bushing was spinning in the rubber. I keep 2 spares on board and start every season with a new one.
BP
Reply With Quote Share with Facebook
  #5  
Old 08-11-2008
danielgoldberg's Avatar
Senior Member
 
Join Date: Feb 2008
Location: New York
Posts: 679
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 7
danielgoldberg is on a distinguished road
Quote:
Originally Posted by Pamlicotraveler View Post
If they weren't in such an awkward position to change I would change mine much more regularly. I don't know why they can't put the impellor access on the outside of the engine...
That drives me absolutely nuts! On most Yanmar installations you need to remove a motor mount to get to the raw water pump, and thus the impeller. What were they thinking, and why on earth don't they change that?!

The Beta Marine engines actually have everything, including the raw water pump, accessible from the front of the motor. That's such a brilliant, and obvious, idea that I'm amazed every manufacturer doesn't do it.
__________________
Dan Goldberg

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #6  
Old 08-11-2008
DrB DrB is offline
Senior Member
 
Join Date: Mar 2007
Location: New England
Posts: 966
Thanks: 0
Thanked 6 Times in 6 Posts
Rep Power: 8
DrB will become famous soon enough
Confused a little......

My Yanmar has the raw water pump on the outside of the motor and it is somewhat easy get to. I don't really have any issue. My cousin's was easy to get to also, although it was on the side instead of the front.

DrB
Reply With Quote Share with Facebook
  #7  
Old 08-11-2008
jbondy's Avatar
Senior Mumble
 
Join Date: Mar 2001
Posts: 320
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 14
jbondy is on a distinguished road
When I replaced my 3GM30 with the newer 3YM30, one of the purported benefits was an ergonomic redesign. Now all the things we need to access are on or near the front of the engine. That's fine, except I've got a v-drive, so the "front" of the engine is aft, deep in a cockpit locker. I have to hang upside down like a bat to check the oil, and don't ask what I have to do change the impleller! I guess you can't please everyone.
Reply With Quote Share with Facebook
  #8  
Old 08-11-2008
Joesaila's Avatar
1977 Morgan OI 30
 
Join Date: May 2007
Location: Massachusetts
Posts: 438
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
Joesaila is on a distinguished road
We were heading out on vacation last week and started the motor to warm it up. A red light came on [overheating!] and I noted 0 water coming out of the exhaust. Checked the sea water strainer, it was clear and then removed a few bolts to lower the water pump. [Yanmar 27hp] Most of the impeller blades were shot so I dug them out and was fortunate to have a spare on board. Then we went on a week long sail. I'll follow the old rule of thumb and change it yearly now. But I do appreciate that tip on the bushing coming off.
__________________
My formula for living is quite simple. I get up in the morning and I go to bed at night. In between, I occupy myself as best I can.
Cary Grant
Reply With Quote Share with Facebook
  #9  
Old 10-15-2008
Mikelivingstone's Avatar
Member
 
Join Date: Apr 2008
Location: Malta
Posts: 50
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
Mikelivingstone is on a distinguished road
It seem like this is what happened to my impellor this weekend. Why does this happen I had changed my impellor about 2 months ago ( and it wasn't cheap)??
Reply With Quote Share with Facebook
  #10  
Old 10-15-2008
.
 
Join Date: Nov 2006
Posts: 10,855
Thanks: 0
Thanked 3 Times in 2 Posts
Rep Power: 12
Giulietta is just really nice Giulietta is just really nice Giulietta is just really nice Giulietta is just really nice Giulietta is just really nice
The impellers are not made by Yanmar, mine are made by Johnson pump, and have gone thru 2 already..and keep a few spares...my only worries is it happening in a moment you really need the engine..It's not really yanmar's fault..I guess...I change every year, need or not...the ones I take away every year serve as spare...in case.

If I could find a better impeller brand that would help..if you guys know of a better one...please tell me.

My access is pretty easy..close saildrive water intake, open 4 bolts, put new one in..all takes me about 4 minutes...open valve (very important)..ehehe

Photo shows my impeller compartment thing cover lid..

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
Need help YANMAR engine mount Giulietta Gear & Maintenance 20 04-15-2010 01:15 PM
Yanmar Engine Mount Specifications HenryTully Gear & Maintenance 4 06-27-2008 10:20 AM
Yanmar 3gmd Question nk235 Gear & Maintenance 4 03-12-2008 04:48 PM
ATF or SAE ? Yanmar 4JH2E / Trans: KM4A TAK Gear & Maintenance 4 11-05-2007 10:34 PM
Prop for Morgan OI w/ Yanmar 3GM30F cwarwick Gear & Maintenance 1 11-16-2004 01:17 PM


All times are GMT -4. The time now is 11:41 AM.

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.