False temp alarm does not go out after start up - SailNet Community
 4Likes
  • 1 Post By jimgo
  • 1 Post By 73Morgan
  • 1 Post By fryewe
  • 1 Post By jameswilson29
 
LinkBack Thread Tools
post #1 of 5 Old 09-30-2013 Thread Starter
Senior Smart Aleck
 
jameswilson29's Avatar
 
Join Date: Aug 2009
Location: Richmond, Virginia
Posts: 2,152
Thanks: 34
Thanked 70 Times in 65 Posts
Rep Power: 6
 
False temp alarm does not go out after start up

After pushing the glow plug button on my Vetus M3.10, normally an alarm sounds until the on button is pushed and the engine is started. Yesterday, for the first time, the alarm did not go off upon starting. The engine temperature light is on; however, the engine is not overheating, the fresh water cooling system works, and the exhaust water is not hot.

If I momentarily press the engine off button, the alarm stops without killing the engine and the engine temp light goes off, but the tachometer stops working. The engine continues to run normally otherwise. There is adequate oil, battery voltage, and coolant.

As far as I know there is no engine water exhaust sensor. Any idea what kind of problem this reveals? Bad circuit, bad connection?

Last edited by jameswilson29; 09-30-2013 at 09:07 AM.
jameswilson29 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 5 Old 09-30-2013
Asleep at the wheel
 
jimgo's Avatar
 
Join Date: Sep 2011
Location: Pennsylvania
Posts: 3,014
Thanks: 71
Thanked 117 Times in 115 Posts
Rep Power: 4
 
Re: False temp alarm does not go out after start up

Sounds like it might be either a bad temp. sender or a wiring problem. Given that it can turn on/off, I'm inclined to think it's the sender.
jameswilson29 likes this.

- Jim
Home: Western Philly 'burbs
1980 Allmand 31
1975 Albacore 15


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
jimgo is offline  
Quote Quick Reply Share with Facebook
post #3 of 5 Old 10-07-2013
Member
 
Join Date: Dec 2012
Posts: 45
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Re: False temp alarm does not go out after start up

Disconnect the wire at the sender. If the light goes off it's your sender. If the light stays on its in the wiring.
jameswilson29 likes this.
73Morgan is offline  
Quote Quick Reply Share with Facebook
post #4 of 5 Old 10-07-2013
Senior Member
 
fryewe's Avatar
 
Join Date: Dec 2004
Posts: 1,619
Thanks: 31
Thanked 52 Times in 52 Posts
Rep Power: 11
 
Re: False temp alarm does not go out after start up

I don't have Vetus but Yanmar...but my panel alarm sounding on engine startup is the low oil pressure alarm which clears when the oil pressure builds up after engine start.

Both the low oil P and high T senders are switches that shut when fault conditions are met to energize the alarm circuits for the audible alarms and lights. Sometimes such switches energize separate relays that operate contacts to complete the alarm circuits. In such cases either circuit could be at fault but if momentary operation of the shutdown switch (loading the circuit to drop voltage?) clears the alarm it's more likely the relay circuit rather than the sensing circuit - if you have such an arrangement.

A high temp sender is easily tested by removing it and placing it in hot water and checking the switch operation with an ohmmeter.
jameswilson29 likes this.

The web makes everywhere the same place. - Fred Reed, from "Fred on Everything"
fryewe is offline  
Quote Quick Reply Share with Facebook
post #5 of 5 Old 01-04-2014 Thread Starter
Senior Smart Aleck
 
jameswilson29's Avatar
 
Join Date: Aug 2009
Location: Richmond, Virginia
Posts: 2,152
Thanks: 34
Thanked 70 Times in 65 Posts
Rep Power: 6
 
Re: False temp alarm does not go out after start up

BUMP for UPDATE:

It was the temperature sensor on the exhaust elbow, which was fairly easily replaced. I did follow the test recommended by 73Morgan by disconnecting the sensor wire to eliminate the possibility of the panel malfunctioning. My engine is running normally again.

Thanks all for your helpful posts.
jimgo likes this.
jameswilson29 is offline  
Quote Quick Reply 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:
OR

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



Similar Threads
Thread Thread Starter Forum Replies Last Post
Sailboat distress call turns out to be false alarm - The Nelson Daily NewsReader News Feeds 0 09-05-2012 05:30 AM
yanmar high temp alarm endevour Diesel 4 09-03-2009 03:52 PM
test high temp. alarm shinyscreen Gear & Maintenance 2 11-09-2007 04:41 AM
Pirate report a ?false alarm? - Wilmington Morning Star NewsReader News Feeds 0 04-19-2006 11:15 AM
US Navy says Yemen pirate attack ?false alarm? - MSNBC NewsReader News Feeds 0 04-16-2006 12:15 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