Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 02-08-2010, 17:20   #1
Registered User
 
gbillman's Avatar

Join Date: Mar 2009
Location: Central east coast of FL
Boat: Robertson and Caine Leopard 40
Posts: 38
Perkins 4-154 Temp Reading in Error

I have a Morgan 41 OI with a "new" 4-154 (rebuilt w/ 70 hours on it). The engine runs great. Problem: engine temp gauge reads abnormally high (maxes at 235 after 30 minutes at 2400 rpm) even though the engine is actually within operating limits (175-190 per laser temp gun). I have changed out the sending unit and the instrument. I have also "jumped" the new sender and instrument with a new 16 gauge wire. I still get high readings. I have no other ideas....please help! Thanks
__________________

__________________
gbillman is offline   Reply With Quote
Old 02-08-2010, 17:34   #2
Senior Cruiser
 
DeepFrz's Avatar

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 7,930
Sender in the right place on the engine??? Have you checked that the thermostat is opening at the correct temp?
__________________

__________________
DeepFrz is offline   Reply With Quote
Old 02-08-2010, 18:04   #3
Registered User

Join Date: Oct 2009
Location: CLOD in OH
Posts: 257
The problem might be the wrong sending unit. Some sending units are for dual stations (1 sending unit sending to 2 guages) or for single stations(1 unit 1 guage). The guage and sending unit must match for accurate readings.
__________________
Paydirt
Mark Zarley is offline   Reply With Quote
Old 03-08-2010, 06:21   #4
Registered User
 
gbillman's Avatar

Join Date: Mar 2009
Location: Central east coast of FL
Boat: Robertson and Caine Leopard 40
Posts: 38
Reply to DeepFrz

I can only find one sending unit and that's behind the most aft cylinder.

I haven't checked the thermostat directly because the engine is running at normal temp per the laser heat gun.
__________________
gbillman is offline   Reply With Quote
Old 03-08-2010, 06:34   #5
Senior Cruiser
 
colemj's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Location: Presently on US East Coast
Boat: Manta 40 "Reach"
Posts: 10,049
Images: 12
Also, there are different temperature range senders and gauges. The sender has to match the gauge or the readings will be off. Is it possible that the original sender or gauge was bad and you got a mismatched set when fixing it?

Coincidentally, we are having the same problem, but I have isolated it to the gauge itself (a benefit of having a "spare" engine onboard - troubleshooting is quicker).

Mark
__________________
www.svreach.com

You do not need a parachute to skydive. You only need a parachute to skydive twice.
colemj is offline   Reply With Quote
Reply

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
Perkins 4-154 Parts Online ? SV Demeter Engines and Propulsion Systems 5 02-04-2015 19:29
Useful Life of Perkins 4-154 SV Demeter Engines and Propulsion Systems 6 12-02-2010 07:52
Perkins 4.154 Thermostart hummingway Engines and Propulsion Systems 6 07-02-2010 18:37
For Sale: Perkins 4.154 sabray Classifieds Archive 5 04-06-2009 10:38
Perkins 4-154 and the Mystery Transmission brian and clare Engines and Propulsion Systems 30 10-01-2008 06:08



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 16:43.


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.