Impeller replacement problem - 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 08-12-2011
Junior Member
 
Join Date: May 2009
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
deborahmaas is on a distinguished road
Unhappy Impeller replacement problem

We have a caliber 40 lrc with a yanmar 4jh2 e 50 hp engine. The impeller is very hard to get to as it is behind the alternator, so while we had that off we decided to check the impeller. It was fine, but got torn up taking it out. The impel loper originally sat recesses about an eighth of an inch within the pump but now will go in no more than an eighth inch protruding. We decided to remove the pump to install the impeller but have come to find out it lies behind the motor mount bracket, so to get the pump off you have to raise the whole motor. Any suggestions before we surrender and call out the mechanic?
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 08-12-2011
Senior Member
 
Join Date: Jun 2007
Location: Wisconsin
Posts: 228
Thanks: 2
Thanked 0 Times in 0 Posts
Rep Power: 8
Mark1948 is on a distinguished road
Not sure of your language use, sounds like the impeller shaft was pulled out on removal. Try replacing the shaft first for proper seating. The install impeller. Use a hose clamp to "squash" it down to size and a little water to lubricate and simply slide it into position. At least this worked on my Universal 18.
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 08-12-2011
Junior Member
 
Join Date: May 2009
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
deborahmaas is on a distinguished road
The raw water pump is behind the alternator. The alternator is out right now allowing us to access the raw water pump and check the impeller. The shaft the impeller slides on to is attached inside the pump which we cannot remove because two of the four bolts holding it on are inaccessible behind a motor mount bracket. We used a tie wrap and lots of lube to put the impeller and it slides in easily for the first part and seems to get hung up with about a quarter inch or so to go in. We tried putting on the cover plate to mash it in the rest of the way and no go. Is it possible the back plate is coming out?
Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 08-12-2011
christyleigh's Avatar
Senior Member
 
Join Date: Dec 2001
Location: North Brookfield, Mass.
Posts: 935
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 14
christyleigh is on a distinguished road
This is interesting to me because my Yanmar 75hp Turbo is probably set up the same way except that I have no side access to the engine at all. I can just barely Touch the impellor while laying on top of the engine. That's why I haven't changed it yet.

I'm wondering if the shaft is driven by a slotted drive that is now not lining up with the shaft that may have been pulled out a little and turned. My Wild Guess would be to try turning the shaft to see if it slips back in a bit ???? Can you see if the shaft has moved out any ? Is there a lip on the shaft back near the back plate ? Have you checked to be sure the impellors are actually identical. Just making wild guesses because one of these days I'll be doing it with my blind finger tips ONLY Please keep us informed.
__________________
Stan
'Christy Leigh'
NC 331
Wickford/Narragansett Bay RI
Reply With Quote Quick reply to this message Share with Facebook
  #5  
Old 08-12-2011
Junior Member
 
Join Date: May 2009
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
deborahmaas is on a distinguished road
We checked part numbers and also physically compared the new impeller with the old and they appear identical. The old impeller was difficult to get out and we tore several vanes removing it, so perhaps we did somehow move the shaft out. It looks like the shaft is somewhat out of line (we can only see it with a mirror) to me, but one diesel mechanic told me that it was supposed to be that way to bend the vanes. He also told me corrosion behind the wear plate could be causing it to back out in which case the pump is bad and will need to be replaced. Will let you know how it all shakes out.
Reply With Quote Quick reply to this message Share with Facebook
  #6  
Old 08-14-2011
tdw's Avatar
tdw tdw is online now
Super Fuzzy Moderator
 
Join Date: Oct 2006
Location: Sydney Australia
Posts: 14,942
Thanks: 5
Thanked 81 Times in 75 Posts
Rep Power: 10
tdw is a jewel in the rough tdw is a jewel in the rough tdw is a jewel in the rough
I know by reputation that Yanmars can be difficult when it comes to impellor replacement. I'm not going to be much help in fitting your new impellor (though my guess is that its catching on something) but for future reference .....

Welcome to Speedseal

This works.
__________________
Andrew B

"Do you think God gets stoned? I think so... Look at the platypus." Robin Williams.
Reply With Quote Quick reply to this message Share with Facebook
  #7  
Old 08-15-2011
Junior Member
 
Join Date: Feb 2008
Posts: 21
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
MitchM is on a distinguished road
1) install the speed seal, it is so easy to remove the pump cover.no more tryng to align the #$%^ little pump cover bolts on t he asymmetric pump cover. 2) buy a joabsco impeller pulle tool which is a clawlike device that grabs the impeller then pulls it out as you thread the center screw (i use the small on my yan 3JH4E 3) call a big yanmar dealer like mack boring in union nj their east coast distributor- yanmar offers a new style 'threaded impeller' that makes getting them in and out a breeze. dealers like to sell their stock of the old style impellers 1st so you have to ask for the new style.4) i hope the impeller vanes broke off as you took the impeller out, and all broken vanes are accounted for and not traveling down to get stuck in your heat exchanger ?
Reply With Quote Quick reply to this message Share with Facebook
  #8  
Old 08-16-2011
Member
 
Join Date: Jan 2008
Posts: 33
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
SabrinaKS is on a distinguished road
Our '98 Caliber 40LRC with a Yanmar 4jh3E has a small access panel on the nav station side of the engine compartment. It's about 8"square and held in by four screws. It appears to be factory installed and provides easy access to our water pump which is in the same location as you describe. I found this panel after I spent 4 hours changing the impeller by feel. Check to see if you have this panel. Also, try rotating the impeller once you have it in, you might find that it will seat to the proper position. Tom
__________________
~~_/)~~_/)~~_/)~~
Sabrina
McVay Minuet 19 "Riot" & Caliber 40 "Honey Ryder"
Lake Perry KS & East Coast

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message Share with Facebook
  #9  
Old 08-16-2011
Zanshin's Avatar
Senior Member
 
Join Date: Aug 2006
Location: Germany
Posts: 2,208
Thanks: 0
Thanked 15 Times in 15 Posts
Rep Power: 9
Zanshin is on a distinguished road
deborahmaas - if you look at my blog page describing my ordeal on an 4JH3TE engine set up the same way at December 2009 Trip Blog and Diary 2009-11-28 then look at the last picture to see the circlip holding in the shaft - perhaps that slipped out during your impeller removal. I find that a small digital camera belongs in my toolkit on the boat as it lets me take pictures of hard-to-see places; I've also got a dentist's mirror but that isn't quite as good.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message Share with Facebook
  #10  
Old 08-16-2011
jrd22's Avatar
Courtney the Dancer
 
Join Date: Nov 2000
Location: San Juan Islands., WA, USA
Posts: 3,844
Thanks: 3
Thanked 18 Times in 18 Posts
Rep Power: 15
jrd22 will become famous soon enough
I pulled the seal out of the back of the pump when replacing the impeller on our Volvo which prevented the new impeller from going all the way in. Not familiar with Yanmar so I'm not sure if this could be the problem. I had to buy the rebuild kit and replace seals, bearings and shaft on ours.
Like Tom says above, try rotating it and pushing it in at the same time.
__________________
John
SV Laurie Anne

1988 Brewer 40 Pilothouse

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
Impeller gives out then...smoke.... GaiaOrion Diesel 5 08-07-2010 06:53 PM
Impeller hrs sailrmon Gear & Maintenance 21 08-05-2010 11:45 PM
Replacing Impeller ccriders Gear & Maintenance 25 06-29-2008 08:12 PM
My knotmeter impeller.. groundhog Gear & Maintenance 18 08-28-2007 04:10 PM
Impeller replacement on westerbeke sailortjk1 Gear & Maintenance 10 07-16-2007 08:44 PM


All times are GMT -4. The time now is 10:30 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.