Yanmar Water Pump - SailNet Community
LinkBack Thread Tools
post #1 of 2 Old 08-16-2009 Thread Starter
Junior Member
Join Date: Oct 2008
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Yanmar Water Pump

I have a 1983 Yanmar 2GM - raw water cooled. I have been told by a mechanic that I am on the verge of needing a new water pump. I put a new impeller in the pump in the spring, he (mechanic) replaced it last week. He also reversed the face plate. He claims it is not pumping enough and the engine is running hot. I have checked in input and it is clean. It appears, to me, that the flow (out of the engine) is good. How can I determine if his assesment is reasonable? I would appreciate any guidance that can be offered. Thank you.
dashman is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
post #2 of 2 Old 08-16-2009
Join Date: Aug 2009
Posts: 78
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
There are a couple of different ways

There are a couple of things you can do. Disconnect the exhaust hose, or water line at the mixing elbow, and using a bucket, check how much water is actually pumping through the engine. A Yanmar manual will tell you how much water it should pump. Second is to install a temp guage, which will eliminate any doubt about engine overheating. If you buzzer and sending unit are working properly, you will get the warning buzzer if it's overheating. You should make sure the sending unit is for a raw water cooled engine. Fresh water cooled one is much cooler than the other. There are also other things that will cause it to run too hot. Mixing elbow, which if it has never been changed on that year model motor, should at least be checked. The raw water strainer can easily get stopped up with weeds or crud. Thermostat that is bad, and not opening properly. One thing I strongly recommend, is find out for sure that if is in fact running too hot, and the exact cause, before you start buying parts and pieces. Replacing parts before being sure of the exact problem, can get very expensive, and frustrating.

Dream like you will live forever. Live like you will die tomorrow. ( James Dean )
flatracker is offline  
Quote Quick Reply Share with Facebook

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


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
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Forum Replies Last Post
yanmar 2GM low cooling water volume?? Northeaster Gear & Maintenance 3 05-30-2007 11:02 PM
Water Pump tdw Gear & Maintenance 8 05-21-2007 05:27 AM
Water Pump Rebuild/Replacement/Spare Jim H Atomic 4 3 04-19-2007 11:15 PM
Basic Thoughts on Tides Jim Sexton Learning to Sail Articles 0 11-17-2003 07:00 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome