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Engine Discussion of preventative/corrective maintenance and other technical issues regarding your coach's engine.

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  #21  
Old 02-24-2009
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Randy Dupree Randy Dupree is offline
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take a pic of that valve they are talking about,i would love to see it.
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  #22  
Old 02-24-2009
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Default second fetzer valve photo

Come to think of it, I'd like to see it too. Under History at Vintage Birds, as a couple of you suggested, my year and model of coach comes with a transmission retarder. I think it's time to talk to the tech instead of the service writer.
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  #23  
Old 02-24-2009
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Raleigh,

My retarder was staying on, even under throttle, earlier last year. Turns out that it was the "throttle modulator"- some sort of throttle sensor- on the Allison tranny. Fix cost around $1200- most of that was "diagnosing". Part only cost around $70 as I recall. It may be cheaper to just give the parts numbers to the shop and say "replace this"- just about all of the parts related to the retarder are easy to get to- bolt on and connect! I still have the invoice, so if you need a scanned copy, let me know.
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  #24  
Old 02-24-2009
jwasnewski jwasnewski is offline
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That valve with a flapper in the exhaust could be the emergency shut down for a run away engine. If that is what it is and it is partially closed you ain't going very far very fast. I would not know if that is manual or operated some other way. It shows that set up in the Detroit manual. I have DDEC II which shuts down the engine another way. Just a thought.
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  #25  
Old 02-24-2009
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Default no turbo boost

Thanks guys, all good thoughts. Remember, my original post was no turbo boost. I guess the guage or sensor could be defective, but I have no power, no boost pressure on the guage, and a top speed downhill of about 50 mph. So, why no boost pressure?

I really need some time with the coach. The shop where it's at is doing rv stuff, not diesel stuff. They're just trying to be helpful in looking at the engine. The closest they come to diesels is whatever comes in Newmar coaches. I've seen the engine bay on one of those, and it's empty compared to my coach!
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  #26  
Old 02-24-2009
jwasnewski jwasnewski is offline
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If you have no boost it should be relatively easy to trouble shoot. If the fresh air filter is plugged or the passage to it is blocked it won't work. Bird nest, Bees etc. If it has an emergency shut down in the exhaust and it is closed or partially closed it will not work. Then there is turbo system itself. Once you are certain inlet and outlet passages are clear you can lock the brakes, chock the wheels put it in gear then add power carefully and see if the turbo is spinning. Don't do that for an extended period, it will heat up the tranny. That will take two folks. One in the cockpit and one at the engine.
If you have a retarder you do not have to be concerned with a jake brake causing the problem.
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  #27  
Old 02-24-2009
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According to my DD manual, there was a flapper valve on some engines(cable operated),
on the intake side. Look just before the turbo for the operating system to see if you
even have such a thing.
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  #28  
Old 02-24-2009
jwasnewski jwasnewski is offline
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My error Steve. It is on the intake side if it has been installed. The result would be the same.
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  #29  
Old 02-24-2009
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No boost means no air flow, restricted fuel flow, or charge air cooler pipe unhooked. If the latter mass black smoke compared to normal will result and sharp increase on EGT's.
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  #30  
Old 02-24-2009
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as far as i know,there was never a flapper on a turbocharged detroit,the un-turboed engines all had a flapper.
the cable shut offs on the birds i've seen were attached to the throttle or gov. lever on the gov housing.
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