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05-13-2015, 07:21 PM
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#1
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Guru
City: Hill Country TX/S.Portland Maine
Vessel Name: bout’ time
Vessel Model: Grady White 282 Sailfish
Join Date: Jul 2012
Posts: 642
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Starboard Cummins 6BTA 5.9 250HP running too warm.
Insight?
Took the boat for sea trial yesterday and the starboard engine was running about 10 degrees warmer (200 degrees) than the port at 1800 RPM. All thru the 1 hour trial the starboard engine ran higher than port. Temp taken with gun, strainers clean, impeller fine. The gauge did flicker a bit and I suspected a thermo. I ran up to Portland and bought 2 new thermostats/gaskets today. The thermo change is a REAL son of a gun being the starboard engine in a tight area with many parts having to be removed. So I go ahead and get started and notice someone has been in there before and likely changed the stat. The port engine is factory untouched in that same area. Soooo, I am now second guessing taking everything apart and changing it.
Thanks,
Rob
__________________
..."some gave all, KIA"...
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05-13-2015, 09:52 PM
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#2
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Technical Guru
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,194
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What does the engine temp do light load vs heavy load? A thermostat usually has about a 10F controlling range so at light load 190 and heavy load 200 means it is controlling there. If light load 170 and heavy load 200 sounds like fouled coolers or sea water restriction.
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05-13-2015, 11:31 PM
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#3
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Veteran Member
City: Seattle
Join Date: Mar 2013
Posts: 92
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Keep in mind that one transmission is rotating opposite than the other, so that corresponding engine will be working harder, so running hotter and using more fuel. As long as the two trannys are working opposite each other, the engines could be tuned identically but will not have the same operating characteristics
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05-14-2015, 12:00 AM
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#4
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Senior Member
City: Astoria
Vessel Name: Florence A
Vessel Model: 47' Sutton
Join Date: Oct 2014
Posts: 173
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Well the problem with not taking it all apart is that you can not trust that the last person who went in there knew what they where doing. Check the last place that was worked on ( in this case the thermostat) verify that it is correct and then go from there. And while it is a simple thing to change you would be surprised how many times it gets screwed up.
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05-14-2015, 05:55 AM
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#5
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Guru
Join Date: Oct 2007
Posts: 22,553
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10deg F is probably beyond the accuracy range for electric gauges.
Try swopping the gauge in the dash and see what the readings become.
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05-14-2015, 08:16 AM
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#6
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Guru
City: gulf coast
Join Date: Jun 2014
Posts: 3,440
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flickering is a clue. you may have a loose connection or a bad sender. If one engine is hooked up to a water heater that will make a small difference.
Typical reasons for cooling problems with cummins is pieces of old impellers partially clogging the next thing in line such as tranny cooler, or pieces of old zincs doing the same in the heat exchanger or after cooler.
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05-14-2015, 09:27 AM
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#7
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Guru
City: Walnut Grove Ca
Vessel Name: Cary'D Away
Vessel Model: Hatteras 48 LRC
Join Date: Apr 2012
Posts: 887
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Can you explain this?
Quote:
Originally Posted by Patemey
Keep in mind that one transmission is rotating opposite than the other, so that corresponding engine will be working harder, so running hotter and using more fuel. As long as the two trannys are working opposite each other, the engines could be tuned identically but will not have the same operating characteristics
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This is the first time I've heard this, can you explain how this works?
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05-14-2015, 09:46 AM
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#8
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Guru
City: Walnut Grove Ca
Vessel Name: Cary'D Away
Vessel Model: Hatteras 48 LRC
Join Date: Apr 2012
Posts: 887
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Heat gun
Since you mentioned you are using a heat gun. Try progressively measuring the temps from the sea strainer at each component to the thermostat housing, then check exhaust manifold, and exhaust shower or riser. No turbo on the 250 right. If turboed the intercooler and turbo housing as well. Looking for the difference will give you a clew. Check the inlet side of the transmission cooler and or engine cooler for impeller pieces. I've actually had impeller pieces shrapnel and end up in the inlet side of the raw water pump. 10 deg is not a lot but it could be differences in valve adjustment, injection problems, or timing.
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05-14-2015, 10:05 AM
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#9
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Guru
City: Hill Country TX/S.Portland Maine
Vessel Name: bout’ time
Vessel Model: Grady White 282 Sailfish
Join Date: Jul 2012
Posts: 642
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Just finished changing the stat, what was in there was not a cummins stat so hopefully that was it.....maybe, wishfully
__________________
..."some gave all, KIA"...
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05-14-2015, 11:46 AM
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#10
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TF Site Team/Forum Founder
City: League City, Tx
Vessel Name: Floatsome & Jetsome
Vessel Model: Meridian 411
Join Date: Oct 2007
Posts: 7,332
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Quote:
Originally Posted by Scary
No turbo on the 250 right.
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NA versions of this engine are 115hp. The displacement of this engine is very similar to the Ford Lehman. So it is turbo. The "B" in the title is the model. The "T" is turbo. The "A" is after cooled. Just for future reference on Cummins nomenclature...
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Prairie 29...Perkins 4236...Sold
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Meridian 411...T-Cummins 450C
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05-14-2015, 03:44 PM
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#11
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Guru
City: Santa Cruz, CA
Vessel Name: Concerto
Vessel Model: 1980 Cheoy Lee
Join Date: May 2013
Posts: 1,531
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I went through this on my 5.9. Let us know if your new thermostat fixed the problem.
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05-14-2015, 09:11 PM
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#12
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Guru
City: Hill Country TX/S.Portland Maine
Vessel Name: bout’ time
Vessel Model: Grady White 282 Sailfish
Join Date: Jul 2012
Posts: 642
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Sea trial today was good, did not get warm at all. Leaving in morning for Portland Maine. 7 hour cruise or so, I'll know soon enough if all is well or
__________________
..."some gave all, KIA"...
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05-14-2015, 09:15 PM
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#13
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Guru
City: Hill Country TX/S.Portland Maine
Vessel Name: bout’ time
Vessel Model: Grady White 282 Sailfish
Join Date: Jul 2012
Posts: 642
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Quote:
Originally Posted by Baker
NA versions of this engine are 115hp. The displacement of this engine is very similar to the Ford Lehman. So it is turbo. The "B" in the title is the model. The "T" is turbo. The "A" is after cooled. Just for future reference on Cummins nomenclature...
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Great info, thanks
__________________
..."some gave all, KIA"...
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05-14-2015, 09:18 PM
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#14
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Guru
City: Hill Country TX/S.Portland Maine
Vessel Name: bout’ time
Vessel Model: Grady White 282 Sailfish
Join Date: Jul 2012
Posts: 642
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Quote:
Originally Posted by Scary
Since you mentioned you are using a heat gun. Try progressively measuring the temps from the sea strainer at each component to the thermostat housing, then check exhaust manifold, and exhaust shower or riser. No turbo on the 250 right. If turboed the intercooler and turbo housing as well. Looking for the difference will give you a clew. Check the inlet side of the transmission cooler and or engine cooler for impeller pieces. I've actually had impeller pieces shrapnel and end up in the inlet side of the raw water pump. 10 deg is not a lot but it could be differences in valve adjustment, injection problems, or timing.
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Great advise but my heat gun went away when the mechanic left, almost went and bought one but I have 2 back home.
__________________
..."some gave all, KIA"...
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05-14-2015, 09:20 PM
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#15
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Guru
City: Hill Country TX/S.Portland Maine
Vessel Name: bout’ time
Vessel Model: Grady White 282 Sailfish
Join Date: Jul 2012
Posts: 642
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Quote:
Originally Posted by bayview
flickering is a clue. you may have a loose connection or a bad sender. If one engine is hooked up to a water heater that will make a small difference.
Typical reasons for cooling problems with cummins is pieces of old impellers partially clogging the next thing in line such as tranny cooler, or pieces of old zincs doing the same in the heat exchanger or after cooler.
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Thanks, good info
__________________
..."some gave all, KIA"...
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05-14-2015, 09:22 PM
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#16
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Guru
City: Hill Country TX/S.Portland Maine
Vessel Name: bout’ time
Vessel Model: Grady White 282 Sailfish
Join Date: Jul 2012
Posts: 642
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Quote:
Originally Posted by FF
10deg F is probably beyond the accuracy range for electric gauges.
Try swopping the gauge in the dash and see what the readings become.
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Heat gun gave these readings not the guages but that is a good idea
__________________
..."some gave all, KIA"...
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