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08-03-2016, 03:21 PM
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#1
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Senior Member
City: Toronto
Join Date: Nov 2015
Posts: 271
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Onan 8KW Gen.
I fired up the Gen. for the first time since launch in June and noticed in the initial water discharge some granular material(s) sort of kitty litter and saw dust looking stuff. The discharge stream seemed irregular ( a bit of flow and a bit of sputtering ) I did not run it long enough to monitor temperature etc. for fear of doing something to this thing.
Does anyone have any idea what this material could have been ( other than bits of impeller ??? ) and if there is potential blockage of the exchanger tubing ... ?
Of note: this is a new boat to us, I have never owned a Gen. before nor have I seen this one running for an extended time.
Thanks in advance ... FB
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08-03-2016, 03:31 PM
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#2
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Guru
City: North Carolina for now
Join Date: Aug 2011
Posts: 6,348
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What did the surveyor have to say about it?
We'd all be purely speculating without first hand inspection. It could be any number of things. Advise getting a tech who knows these.
__________________
George
"There's the Right Way, the Wrong Way, and what some guy says he's gotten away with"
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08-03-2016, 03:42 PM
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#3
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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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I would say it could be a critter that nested up there???
Impeller pieces likely would not make it out of the exhaust. They would have to get thru the heat exchanger first.
I would check the impeller though. I would also check the intake side of things....thru hull and strainer and such.
__________________
Prairie 29...Perkins 4236...Sold
Mainship Pilot 30...Yanmar 4LHA-STP...Sold
Carver 356...T-Cummins 330B...Sold
Meridian 411...T-Cummins 450C
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08-03-2016, 03:45 PM
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#4
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Senior Member
City: Buffalo
Vessel Name: Almost Perfect
Vessel Model: Kadey-Krogen 48
Join Date: Dec 2015
Posts: 232
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You were wise to shut it down. Certainly debris coming out the exhaust is not normal, and indicates something is in there that shouldn't be there. Perhaps a bird or a mouse built a nest while the boat was hauled of the winter. You may have washed them out. Regardless, check that everything is clear before you start again.
This doesn't sound like the impeller. The impeller is probably black rubbery, and pieces probably wouldn't get past the heat exchanger anyway. But you should check the impeller before first start every spring, and make sure that you find and remove any fins that have broken off.
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08-03-2016, 04:08 PM
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#5
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Senior Member
City: Toronto
Join Date: Nov 2015
Posts: 271
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Quote:
Originally Posted by caltexflanc
What did the surveyor have to say about it?
We'd all be purely speculating without first hand inspection. It could be any number of things. Advise getting a tech who knows these.
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LOL ..... the surveyor said there was an Onan 8KW Generator .....
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08-03-2016, 04:10 PM
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#6
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Senior Member
City: Toronto
Join Date: Nov 2015
Posts: 271
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Quote:
Originally Posted by Rossland
You were wise to shut it down. Certainly debris coming out the exhaust is not normal, and indicates something is in there that shouldn't be there. Perhaps a bird or a mouse built a nest while the boat was hauled of the winter. You may have washed them out. Regardless, check that everything is clear before you start again.
This doesn't sound like the impeller. The impeller is probably black rubbery, and pieces probably wouldn't get past the heat exchanger anyway. But you should check the impeller before first start every spring, and make sure that you find and remove any fins that have broken off.
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Thank you, Very good point re: wildlife building a nest or something .... I never thought of it. But good advice in having a good check just to be sure.
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08-03-2016, 04:13 PM
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#7
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Senior Member
City: Toronto
Join Date: Nov 2015
Posts: 271
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Quote:
Originally Posted by Baker
I would say it could be a critter that nested up there???
Impeller pieces likely would not make it out of the exhaust. They would have to get thru the heat exchanger first.
I would check the impeller though. I would also check the intake side of things....thru hull and strainer and such.
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Thank you, this was granular stuff, sort of beige in colour and small enough to go through the exchanger tubes, I think .....
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08-03-2016, 04:19 PM
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#8
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Senior Member
City: Lafayette, LA
Vessel Name: presently boatless
Join Date: Dec 2014
Posts: 350
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Ya'll got dirt diver wasps up there? They love to build nests of mud inside of any small openings. I have to clean out vent openings all the time because of these insects!
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08-03-2016, 04:33 PM
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#9
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Guru
City: Gulf Shores, Ala.
Vessel Name: Ulysses
Vessel Model: Romsdal 1963
Join Date: May 2013
Posts: 878
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"dirt wasps" = "mud daubbers"
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08-03-2016, 05:13 PM
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#10
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Guru
City: Montgomery, TX
Vessel Name: Encore
Vessel Model: Whitby 42
Join Date: Feb 2012
Posts: 844
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Quote:
Originally Posted by Ex Sailor
LOL ..... the surveyor said there was an Onan 8KW Generator .....
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Typical................
And we pay them money for that!
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08-03-2016, 06:03 PM
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#11
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Veteran Member
City: Corona
Vessel Name: SCRAMBLER
Vessel Model: 1974 Grand Banks 32 #536
Join Date: Jul 2013
Posts: 74
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Maybe some rust from the exhaust elbow? When was the last time it was replaced? If you still had a good water flow I would say your impeller is working.
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08-03-2016, 06:11 PM
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#12
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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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Sounds like zinc debris. Normal. Mixer is a nice welded ss unit, does not shed debris.
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08-03-2016, 08:39 PM
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#13
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Senior Member
City: Deltaville, VA
Vessel Name: Cork
Vessel Model: Halvorsen GC32
Join Date: Nov 2013
Posts: 120
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Sounds like prostate trouble to me. Oops, wrong blog.
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08-03-2016, 10:06 PM
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#14
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Moderator Emeritus
City: SEWARD ALASKA
Vessel Name: DOS PECES
Vessel Model: BAYLINER 4788
Join Date: Feb 2011
Posts: 6,267
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This whole thread is way overboard. My goodness. Follow the advice here and you'll be tearing down the generator.
You only have one question to answer... did it overheat???
If it did not, run the generator. You yourself said its a new boat to you. That most likely means that it has not been run for awhile.
Could be any number of things, but if it does not overheat then the cooling system is working properly.
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08-04-2016, 12:56 PM
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#15
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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 ksanders
This whole thread is way overboard. My goodness. Follow the advice here and you'll be tearing down the generator.
You only have one question to answer... did it overheat???
If it did not, run the generator. You yourself said its a new boat to you. That most likely means that it has not been run for awhile.
Could be any number of things, but if it does not overheat then the cooling system is working properly.
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While I was going to write something similar, I paused. Because if he does run it and there is an obstruction, it could do more than just overheat...like water backing up into the cylinders. Not likely but I didn't want to say "just run it" and if it doesn't overheat, it is fine. I, personally, would do a bit of "mechanical" diligence before I started again.
__________________
Prairie 29...Perkins 4236...Sold
Mainship Pilot 30...Yanmar 4LHA-STP...Sold
Carver 356...T-Cummins 330B...Sold
Meridian 411...T-Cummins 450C
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