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Generators In this forum we will try to answer any of your questions about the different model generators that can be found on Blue Bird coach's.

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  #11  
Old 07-14-2010
dthollis dthollis is offline
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185-2203 Gasket, Exhaust Manifold
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  #12  
Old 07-14-2010
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Bill Pape Bill Pape is offline
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Quote:
Originally Posted by Robert Britton View Post
John, on my FC I had a rattle as you describe while running the generator. My problem turned out to be a broken flex pipe on the exhaust. There is a turndown off of the manifold made out of pipe that directs the exhaust downward. The flex pipe is located up high right after the 90 degree turn down.

I had my local muffler shop order a new 1-3/4” x 8” braided flex pipe. Had the shop weld 1-1/2” pipe onto both ends cut to length then they flared both ends to fit over the existing 1-1/2” pipe. Muffler clamps were used on the flared ends.
Robert,

Can the exhaust be removed without pulling the Onan??
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  #13  
Old 07-14-2010
Robert Britton Robert Britton is offline
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Quote:
Originally Posted by Bill Pape View Post
Robert,

Can the exhaust be removed without pulling the Onan??
If you can reach in the blind and get to the nuts and bolts on the flange that Bill was talking about in a previous post, then yes you can remove the exhaust with generator in place. You might be able to reach from back side…either way it will be tough to get to.

For my repair I did not have to remove the flange. The old flex pipe broke off on the pipe that turns down to the ground, all I had to do was remove the lower hanger brackets and the whole assembly came off in one piece. I used a small air grinder to clean the weld off the pipe that was up high behind the gen set, got most of it and was able to get the rest with a hand file. It was difficult to reach up in there to work as there was not much room.

I used muffler clamps to install the new flex pipe into place and that was a long reach but doable. Bottom line, there is little access back there and it won’t be easy.
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  #14  
Old 07-14-2010
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Turbokitty Turbokitty is offline
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Quote:
Originally Posted by Kenneth beeler View Post
John why dose your bird have a 8.5kw and mine a 12.5 i don't think i need all the kw so am looking for a smaller gen set take that 12.5 big out and put a gen set on wheels may be a 7.5
Kenneth,

It really has to do with 2 A/C units verses 3 A/C units. The 12.5KW really is an overkill but provides the ability to not have to manage power loads. With a 12.5KW you can run everything at one time (and still have enough power to run a small town!). If you went with an 7.5/8.0KW diesel unit you would not safely start and run all 3 A/C units at one time basically speaking...

I too agree that the 12.5KW is an overkill. I would like a 8KW diesel "silent" generator myself.
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  #15  
Old 07-14-2010
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Thanks Robert, Good info.

I did not replace the flex pipe when I had the Onan out about 5 years ago. Now I think it needs replaced, thanks for the pictures.
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  #16  
Old 07-14-2010
Robert Britton Robert Britton is offline
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Quote:
Originally Posted by Bill Pape View Post
Thanks Robert, Good info.

I did not replace the flex pipe when I had the Onan out about 5 years ago. Now I think it needs replaced, thanks for the pictures.
If I had to do the job over, I would use two new flex pipes as Rich D. used on his. The new flex pipe is shorter then the original so may not do as good of job absorbing vibration.

With two flex pipes you can mount one on the vertical section of pipe behind the gen set and another horizontal before the muffler. I think this would do a better job absorbing vibration.

Here are a couple close-ups of the new flex pipe I used.
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  #17  
Old 07-14-2010
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I think I may have a broken bolt on the exhuast connection to the manifold. I can feel a bolt head, but on the other side there is none. I stuck a small screw driver in there and could feel some resistance so I ASSUME I have a broken bolt. Gosh I didn't want to have to drop the gen set until I had the insulation to redo the whole nine yards. So I guess by removing the manifold I will have a dry run and drop the unit slightly to get to the exhaust. My question to Bill, Robert or others with an 87-89 FC can it be done without disconnecting everything meaning rad hoses and electrical connections?
I just want to drop it 6 - 10 inches to make wrenching easier!
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  #18  
Old 07-14-2010
Robert Britton Robert Britton is offline
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I can't help with that one John, I don't know.
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  #19  
Old 07-14-2010
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John,

Check out post #9 picture, that is the rear, lots of stuff.
the manifold has a shop rag on the top left , that is the exhaust.
the black hoses at the right make a 90* turn to the rear, and route through the back board & are connected to the nipples & radiator hoses in picture #1.
Top right there are two wire harness connectors.
Look close at the bottom tray, two holes each side,
A guy at RATS said he could remove the two front bolts and tip the gennie forward on a floor jack, I have not tried this , but I guess it is possible , But with the wires and old hoses, something may become disconnected, or crack a hose.
I suggest taking it out, and plug the fuel lines, tie up the wires and exhaust and continue to use the Bird. This will take time to order and accumulate all the parts needed for a complete R&R.
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  #20  
Old 07-14-2010
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More pictures. See the exhaust manifold in picture #2
Sure is pretty when finished, Juregen just put his back together, & it was upfront on his SP.
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