Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 26-09-2012, 18:19   #1
Registered User
 
bill good's Avatar

Join Date: Oct 2006
Location: Brisbane Australia
Boat: sold
Posts: 721
Yanmar 1GM water pumps

Just though I would see if anyone has ever rebonded these impellers?

Was working with some glue used repairing a Zodiac & though it might work so a rebonded impeller is under test.

The cost of replacements for the past 14yrs for this one item has been at least $1500.00 for two engines.

Bill
__________________

__________________
bill good is offline   Reply With Quote
Old 26-09-2012, 18:28   #2
Senior Cruiser
 
atoll's Avatar

Cruisers Forum Supporter

Join Date: Mar 2010
Location: gettin naughty on the beach in cornwall
Boat: 63 custom alloy sloop,macwester26,prout snowgoose 37 elite catamaran!
Posts: 9,311
Images: 75
Re: Yanmar 1GM water pumps

how does that compare to the price of a new head gasket if it fails
__________________

__________________
my catamaran building project updates http://www.cruisersforum.com/forums/...36#post2502136
atoll is offline   Reply With Quote
Old 26-09-2012, 20:12   #3
Registered User
 
bill good's Avatar

Join Date: Oct 2006
Location: Brisbane Australia
Boat: sold
Posts: 721
Re: Yanmar 1GM water pumps

I have been changing these impellers every 12 mths & run the engines weekly. The temp warning is very close to normal operating temp which is what will save the engine. This is an on going 1GM problem for salt water by my experence. Maybe plumbing a fresh water wash in the system may also help. I just though someone may have tried to rebond one that failed early in its ops.
__________________
bill good is offline   Reply With Quote
Old 27-09-2012, 19:51   #4
Registered User

Join Date: Jul 2012
Location: Auckland New Zealand
Boat: Farr 1020
Posts: 101
Re: Yanmar 1GM water pumps

I guess the you mean the cost has been $1500 for a total of 28 impellers over 14 years on a yearly replacement policy? That is not a major expense considering the risk of failure of a repaired impeller which is almost bound to happen at the least opportune time.

Acushla
__________________
Acushla is offline   Reply With Quote
Old 27-09-2012, 22:20   #5
Registered User
 
bill good's Avatar

Join Date: Oct 2006
Location: Brisbane Australia
Boat: sold
Posts: 721
Re: Yanmar 1GM water pumps

I would not even be trying if the replacement once a season worked but it has not. I put this out for response from people who know & love 1GMS. The bonded repair looks good & time will test that. Most of the failed impellers don't have any amount of wear on the blades!!

Regards
__________________
bill good is offline   Reply With Quote
Old 27-09-2012, 23:55   #6
Registered User

Join Date: Feb 2012
Posts: 2,441
Re: Yanmar 1GM water pumps

Hmm.. I'm doing up a 1GM as a standby motor which has to be ultrareliable. I'm thinking of fitting an external water pump, bypassing the built-on item.

If the people who supply OEM for Yanmar can't get the impeller to bond reliably in the first place, I'm not sure I fancy my chances of doing a better job. I don't suppose there's any 'aftermarket' supplier?

I've been foster parent to a 23' trailerable offshore sailboat with a 1GM-10 for the greater part of the last two decades, so I can understand your affection for this motor - it's a wee sweatheart.

This motor would only have done a few hundred hours, certainly well under five hundred - both the owner and I prefer to behave as though there's no engine.

It is still on either the original impellor or the first replacement, but the engine gets a maximum of three weeks in salt water before getting pulled out and the whole system fresh water flushed, so you might be onto something there...

I wonder if there's another impellor of similar dimensions (identical, in terms of the tip diameter and blade width) made in another factory, with a decent bond - if the shaft journal were slightly bigger, it would be no major problem to machine it down.
__________________
Andrew Troup is offline   Reply With Quote
Old 30-09-2012, 01:24   #7
Registered User
 
NoTies's Avatar

Join Date: Nov 2005
Location: Vanuatu
Boat: Whiting 29' extended "Nightcap"
Posts: 1,378
Images: 2
Re: Yanmar 1GM water pumps

Out of necessity I have re-bonded 2GM impellors with limited success. It seems to be a major issue with them. Am currently running an impellor for a 12mm shaft instead of the Yanmar standard 3/8" shaft, I bushed it down to suit. It has been in for over a year now & no problem. I assume the greater surface area of the bigger diameter boss is the reason.
__________________
Pete

Positively, socially deviant.
NoTies is offline   Reply With Quote
Old 30-09-2012, 12:20   #8
Registered User

Join Date: Feb 2012
Posts: 2,441
Re: Yanmar 1GM water pumps

NoTies
Interesting ... do you have a part number for the impeller you used, or can you remember what engine or pump it was intended to fit?

When you say "bushed it down" I'm not sure I understand what you mean
__________________
Andrew Troup is offline   Reply With Quote
Old 30-09-2012, 12:38   #9
Registered User

Join Date: Oct 2007
Location: virginia
Boat: islandpacket
Posts: 1,833
Maybe I assume too much. But I understood that the 1gm,2gm and 3gm used most of the same parts. That the water pumps were the same. I bought some aftermarket blue run dry impellers to fit my 3gm30 that worked well. I dont quite understand gluing the impeller blades back on. If they are not holding up. I would concider loss of water (lubrication) or roughness inside the pump and needs rebuild or replacement. I doubt that you got an entire crate of bad impellers. I would look at causes to failure instead of the impeller itself. best of luck tracing it down.
__________________
That derelict boat was another dream for somebody else, don't let it be your nightmare and a waste of your life.
Badsanta is offline   Reply With Quote
Old 30-09-2012, 13:08   #10
Registered User
 
NoTies's Avatar

Join Date: Nov 2005
Location: Vanuatu
Boat: Whiting 29' extended "Nightcap"
Posts: 1,378
Images: 2
Re: Yanmar 1GM water pumps

Badsanta, the problem is the metal driving boss coming away from the flexible impellor.
Andrew, no part number unfortunately but it is a standard Jabsco impellor. Jabsco make these sive impellors with pin drive in both 3/8" and 12mm shafts. I made a bush out of the centre of an old impellor so a 12mm would fit onto a 3/8" shaft. For some reason the Yanmar pumps are 3/8"
__________________
Pete

Positively, socially deviant.
NoTies is offline   Reply With Quote
Old 02-10-2012, 17:56   #11
Registered User

Join Date: Jun 2012
Posts: 307
If you are set on gluing it back together, I recently used west systems 5min epoxy to set some miss ordered EPDM coupling elements into the cast steel coupling halves. This was a 30hp direct drive electric motor. One of the pumps fouled and it actually separated the rubber element with out the west epoxy letting go at the rubber to metal glue joint. So if I was to try a rubber to metal glue process this would be one I would try, cheep too.
__________________

__________________
Cruisingscotts is offline   Reply With Quote
Reply

Tags
water, yanmar

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not 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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 15:49.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.