Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 24-07-2015, 06:29   #1
Senior Cruiser
 
Kenomac's Avatar

Cruisers Forum Supporter

Join Date: Jan 2012
Location: Somewhere in the Adriatic Sea
Boat: Oyster 53 Cutter
Posts: 8,511
Johnson Waterpump Help

If it's not one thing, it's another. How do people who aren't handy handle these situations?

A week ago, our Westerbeke Generator Waterpump impeller exploded, so today we finally found a new one and tried to install it. It didn't go well, we noticed some corrosion around the base of the Johnson water pump where the drive shaft is exposed and I felt a little 1-2mm play in the driveshaft which didn't seem normal. The plan was to install the new impeller and see if there was a water leak coming from the base of the pump, which would probably indicate worn out bearings or a seal, but we couldn't get the new impeller to fit inside the drive shaft slot; the pin seemed a little too wide. The old impeller pin is noticeably smaller, but it looks as though the difference in size was due to corrosion. Both impellers, new and old are the model 810. OEM

Any mechanics whith suggestions? Should I just order a complete new pump at this point. Hopefully, you can see the corrosion in the pictures.

Thanks

Ken
Attached Images
 
__________________

__________________
Kenomac is offline   Reply With Quote
Old 24-07-2015, 14:18   #2
Registered User

Join Date: Nov 2014
Posts: 606
Re: Johnson Waterpump Help

The corrosion which you see on the pump body at the weep hole indicates water leakage past the pump water seal. This is understandable. With 2mm play in the shaft it will be about impossible for any seal to control leakage. The pump needs to be rebuilt with new bearings, oil seal, water seal and impeller. It might also need wear plate, cam (if replaceable), and cover plate.

Might be best to replace the pump and rebuild the old one at your leisure for a spare.

DougR
__________________

__________________
DougR is offline   Reply With Quote
Old 24-07-2015, 16:46   #3
Senior Cruiser
 
Kenomac's Avatar

Cruisers Forum Supporter

Join Date: Jan 2012
Location: Somewhere in the Adriatic Sea
Boat: Oyster 53 Cutter
Posts: 8,511
Re: Johnson Waterpump Help

Quote:
Originally Posted by DougR View Post
The corrosion which you see on the pump body at the weep hole indicates water leakage past the pump water seal. This is understandable. With 2mm play in the shaft it will be about impossible for any seal to control leakage. The pump needs to be rebuilt with new bearings, oil seal, water seal and impeller. It might also need wear plate, cam (if replaceable), and cover plate.

Might be best to replace the pump and rebuild the old one at your leisure for a spare.

DougR
Thanks Doug.

Just as I suspected, been through this many times with automotive water pumps. Is this also the possible reason for the impeller to fail so quickly? I forgot to mention in my earlier post that I noticed a puddle of water, of significant quantity on the tray below the genset.
__________________
Kenomac is offline   Reply With Quote
Old 27-07-2015, 05:37   #4
Registered User

Join Date: Nov 2014
Posts: 606
Re: Johnson Waterpump Help

Don't know that 2mm play would cause the impeller to go prematurely, but it couldn't help things. What do you consider premature?

If you disassemble the pump you will have a clearer picture of the impeller pin and drive shaft slot, and be able to figure out why the pin wouldn't fit the slot. Maybe there is a little bit of a burr or distortion from wear....a couple of strokes with a fine file might solve that.

DougR
__________________
DougR is offline   Reply With Quote
Reply

Tags
water

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Volvo Penta Waterpump Repair Kit..... reiner Engines and Propulsion Systems 7 31-12-2014 01:54
3GM30F E jonhson waterpump dennisail Engines and Propulsion Systems 3 22-02-2014 19:26
Raw waterpump leaking nl 673 Sylfer Electrical: Batteries, Generators & Solar 0 16-02-2014 13:14
Northern lights 673 RAW waterpump leaking Sylfer Electrical: Batteries, Generators & Solar 0 16-02-2014 12:05
6 hp merc and waterpump bcguy Auxiliary Equipment & Dinghy 1 18-04-2013 19:54



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 16:04.


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.