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Old 08-15-2022, 10:11 AM   #1
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GEN SET Installed wrong

My previous post complaining about my Power Tech CD8000 seems to be mis- directed.
After talking to a custom generator manufacturer I'm now convinced that that the problem is not the Power Tech CD8000. Many of you have responded how happy you are with your and the company I spoke with tells me its not a genset issue but an air flow issue.
My unit was installed when the coach was built in 2000 by Country Coach.
Can someone who has a Power Tech genset and is happy with it please send me some pictures of the bottom of the bay where the fan pushes out the hot air and the cold air is sucked into the genset bay???
I've suspected all along that air flow was the issue, now I'm convinced that is the issue. The genset isn't getting enough "fresh air" and is living in it's own "hot air" which gets hotter the longer it runs until its protection circuits shut it down.
I'd also like some recommendations for a service facility that can fix this issue since none of the big names I've spent thousands of dollars with have managed to make it work.
NOT HAVING ANY LUCK ATTACHING PICTURES
Thanks in advance
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Old 08-15-2022, 10:25 AM   #2
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You didn't read post #4 in this thread https://www.irv2.com/forums/f112/200...or-590324.html, did you?
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Old 08-15-2022, 10:30 AM   #3
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Quote:
Originally Posted by JOC1212 View Post
NOT HAVING ANY LUCK ATTACHING PICTURES
Thanks in advance
If you're posting pictures from a computer ; re-size them prior to posting ; too large a format and the iRV2 computer will do funny things to fit them to a post ( rotate ) .
640 pixels works best for me.
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Old 08-15-2022, 11:47 AM   #4
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Couple of things: (this coming from a mechanic, I have no experience with this coach nor this generator)...


Can you physically check the airflow on both of your vents? Either by reaching under while running, or affixing cardboard to both so it will move with the air?


How many hours are on the generator? Is this a "new" problem or one you have had forever and just fought with it or used it in a different (possibly cooler) setting?


This generator is water cooled, are you sure the radiator, radiator fan, and water pump/coolant are all working correctly?


Are there auxiliary fans to push air into or out of the vents? Is the intake vent in front of the exhaust? How far apart are they?


Is the mudflap helping or hurting air flow into that vent?


Will it run while the coach is parked?


You said you have spent a bunch of money trying to get it to run cool. What specifically have they done to fix this problem? I would assume to see fans or metal shrouds to direct cool air into those vents if they are the only way to get air to the radiator....



My basic troubleshooting would look something like this:
1. Coolant level and condition.
2. Radiator fan moving correctly
3. Coolant flow thru radiator (water pump, plugged radiator.)
4. Air flow thru those two vents.

5. Maybe add a spal fan to push air into the "intake" vent and test to see if it will stay cool... ONLY If everything else checks out.


This is all assuming the generator is running correctly (at least until it overheats).
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Old 08-16-2022, 05:59 PM   #5
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My PT7000 is mounted on a nose slide, not inside a compartment, so it gets plenty of air (but is not very quiet). The area below the nose slide is not sealed off. It is just open to the roadway below.

If there is nothing else mounted in your generator compartment, why not just open several new holes in the floor to allow air into the compartment? Maybe add some air scoops or similar.
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Old 08-16-2022, 06:04 PM   #6
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Im acually thinking of opening the whole floor except where the thing is mounted..or taking the entire sound shield off of it.
At my wits end. Spent all day doing what pt told me to do even though i did not agree with it but had to do it since they suggested it.
Not easy people to deal with
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Old 08-16-2022, 06:59 PM   #7
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Response

Quote:
Originally Posted by pretaco View Post
couple of things: (this coming from a mechanic, i have no experience with this coach nor this generator)...


Can you physically check the airflow on both of your vents? Either by reaching under while running, or affixing cardboard to both so it will move with the air? >>>>>good air flow both openings


how many hours are on the generator? Is this a "new" problem or one you have had forever and just fought with it or used it in a different (possibly cooler) setting?[b]>>>>>551....had this issue since 2007 . Works if its cool (<50f)


this generator is water cooled, are you sure the radiator, radiator fan, and water pump/coolant are all working correctly?>>> they have all been serviced by the power tech west coast service center


are there auxiliary fans to push air into or out of the vents? Is the intake vent in front of the exhaust? How far apart are they>>>>>no aux fans. Exhaust is 14 feet fron intake. Intake is minimal in my opinion.


Is the mudflap helping or hurting air flow into that vent?>>>>i just moved the mud flap per factory instructions....no change from where it was. Where the factory said to put does not make sense to me.


Will it run while the coach is parked?>>>>>> wont work running or sitting.


You said you have spent a bunch of money trying to get it to run cool. What specifically have they done to fix this problem? I would assume to see fans or metal shrouds to direct cool air into those vents if they are the only way to get air to the radiator....>>>>> 3 different big name service organizations and no oneone has done anything but collect my money



my basic troubleshooting would look something like this:
1. Coolant level and condition.>>>>>>check
2. Radiator fan moving correctly>>>>>>check
3. Coolant flow thru radiator (water pump, plugged radiator.)>>>>>check
4. Air flow thru those two vents.>>>>>lots

5. Maybe add a spal fan to push air into the "intake" vent and test to see if it will stay cool... Only if everything else checks out.>>>> being a retired fire chief i understand the need for air to have an internal combustion engine run properly. The issue that country coach did not install this gen set properly and even the power tech says they had to make many modification....i'm now in the process of trying to find out what those modifications were.


This is all assuming the generator is running correctly (at least until it overheats).
runs great has great power for approximately 20 minunts until it over heats and shuts down.

Thanks for all you help and please excuse my total frustration
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Old 08-16-2022, 07:26 PM   #8
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This is a common problem with the Onan 5500 and 4000. The 5500 has its intake and exhaust air side by side underneath. Hot air from the engine and engine exhaust gets sucked into the cooling side and shuts the generator down which sounds like what yours is doing. For the 5500 there is a TSB recall to mount a shield underneath to force the cooling air to be drawn from the outside of the side separate from underneath. Does it only do it when outside temps are high?
Even tho it doesn’t pertain to your generator, here is the bulliten.

https://static.nhtsa.gov/odi/tsbs/20...85378-0001.pdf
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Old 08-16-2022, 10:45 PM   #9
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I would get a heat gun and start checking some temps. You want to see block temp and upper and lower radiator temps to check performance. With the cooling air you want to look for the delta T (temperature differential ) This would apply to coolant inlet and outlet of the radiator and also the incoming and outgoing cooling air. This will tell you how much heat is actually being removed. My gut feeling is if your truly getting high temps and not a sender issue you likely would have a radiator that needs service. This will show up with little to no deltaT. Radiators can get plugged up quickly with poor coolant maintenance.
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Old 08-23-2022, 02:55 PM   #10
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Looks like your answer....AND your solution?


https://static.nhtsa.gov/odi/tsbs/20...85378-0001.pdf
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Old 08-23-2022, 08:30 PM   #11
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There is one other thing you might check, there is a insulated heat shield between the generator motor and the coolant radiator. That shield has a tendency to become loose and not stay in place which might result in radiator getting additional heat from the generator motor.


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