Thread Tools Display Modes
Old 08-05-2012, 12:23 PM   #1
Join Date: Aug 2011
Posts: 16
Riser temp

My 34' Californian has 3208 NA's. The port exhaust risers run 98F at 1700RPM and the SB engine risers run at 78F at 1700RPM. Heat exchanger temps are both 120F. This condition stays like this even after many hours of running. The raw water pumps were new just over a year and about 150 hours ago as we're the risers and heat exchanger cleaning. I am not sure if this is a problem or not but it seems like they should be closer in temp. I cruise at that rpm most of the time and take my heat gun to the engines every hour or so while underway. Have not noticed any temps above 185 on the exhaust manifolds.

Does the difference of 20F in the riser temp indicate a problem? If so, what?

Mgtdguy is offline   Reply With Quote
Old 08-05-2012, 04:10 PM   #2
Shoalwaters's Avatar
City: Rodney Bay Lagoon
Country: St. Lucia, West Indies
Vessel Name: "Dragon Lady"
Vessel Model: DeFever 41
Join Date: Feb 2008
Posts: 611
The temperatures should be fairly similar. Is this a new problem, or has there been a difference in temps since the new pumps and H/E cleaning? Sounds like there is significantly more water flowing through the stbd exhaust riser than the port one. The question is why? I would be inclined to check the raw water pump impellers first. Are the sea strainers and through-hulls clear?

If all else fails, read the instructions
If it ain't broke, don't fix it
Shoalwaters is online now   Reply With Quote
Old 08-05-2012, 06:50 PM   #3
Senior Member
capt jerry's Avatar
Join Date: Oct 2007
Posts: 314
may be that engine is working harder than th e other one???
capt jerry is offline   Reply With Quote
Old 08-05-2012, 07:32 PM   #4
Join Date: Aug 2011
Posts: 16
They both ran about the same 75-78F until the return trip from the Canadian Gulf islands which was a 11 hour run at 1700RPM. The last few hours of that trip was when I noticed the port engine risers running hotter than the starboard risers. The engine temp gauge remained at the same level and the riser temps did not get any hotter so I continued on home. The raw water impeller is a good place to start. Because the exhaust exits are partially submerged it is difficult to determine if one engine is pumping out more than the other. Thanks-Steve
Mgtdguy is offline   Reply With Quote
Old 08-05-2012, 08:19 PM   #5
JAT's Avatar
Country: US
Vessel Name: Just a Tinch
Vessel Model: Gulfstar 44 MC
Join Date: Jan 2010
Posts: 595
Any possibility you have a sticky thermostat?
JAT is offline   Reply With Quote
Old 08-06-2012, 05:12 AM   #6
FF's Avatar
Join Date: Oct 2007
Posts: 14,908
Don't worry , be happy!

FF is offline   Reply With Quote

Thread Tools
Display Modes

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

All times are GMT -5. The time now is 06:52 AM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012