Okiewebb Posted April 11 Share Posted April 11 We have our 2003 Executive in the shop to work on turbo air charge leak. Mechanic thinks our engine exhaust line is possibly the problem because it looks flattened. What should the exhaust line/pipe look like? Rounded or flattened on the bottom? Link to comment Share on other sites More sharing options...
timaz996 Posted April 11 Share Posted April 11 What engine do you have? Pictures would also help. Link to comment Share on other sites More sharing options...
cbr046 Posted April 11 Share Posted April 11 I'll ask the obvious . . . . how flat is it? If the exhaust was flattened maybe, but IMO I don't think so. But then I'm not a turbo expert. - bob Link to comment Share on other sites More sharing options...
Okiewebb Posted April 11 Author Share Posted April 11 Engine is Cummins M11 ISM Link to comment Share on other sites More sharing options...
vito.a Posted April 11 Share Posted April 11 The exhaust pipe on these coaches exits the turbo and runs down the drivers side and then goes under the engine oil pan to the passenger side rear corner. Usually the trailer hitch cross member protects the exhaust pipe but it is possible to scrape it. Raise the coach up manually (engine running for air pressure) using the HWH air ride panel on the drivers left side. Then go look under the rear and see if the pipe is smashed. 1 Link to comment Share on other sites More sharing options...
Chargerman Posted April 11 Share Posted April 11 (edited) The pipe that goes under the oil pan was flattened from the factory in many cases. Mine was on my 06 Exec. When I replaced it I used round pipe and it is still slightly above the protective crossmember. If your pipe looks like it has a uniform flat but otherwise is in good shape then it does not need replacing Edited April 11 by Chargerman Link to comment Share on other sites More sharing options...
Ivan K Posted April 11 Share Posted April 11 If it really is badly flattened, like by dropping the coach over a concrete block at some campground back-in sites, probably easiest repair would be a flexible piece like used on ours. But it is a 5" pipe, a little flatness won't make huge difference. Link to comment Share on other sites More sharing options...
Paul J A Posted April 11 Share Posted April 11 The shape may be distorted, but the cfm of exhaust is not disturbed until a bend, curve, in the straight line of it occurs. Go straight pipe and eliminate all back pressure. Link to comment Share on other sites More sharing options...
Chargerman Posted April 11 Share Posted April 11 This is mine after I finished the complete replacement 1 Link to comment Share on other sites More sharing options...
Okiewebb Posted April 11 Author Share Posted April 11 Thank you all for replying to our questions. My husband says that line is going to be replaced. We must have damaged it last summer on our wonderful CA highways…… Link to comment Share on other sites More sharing options...
Chargerman Posted April 11 Share Posted April 11 If you are needing to replace that cross pipe I would suggest you take a real close look at the area that’s after the turbo. In many cases that is the first area to fail. Usually starts with small pin holes 1 Link to comment Share on other sites More sharing options...
Okiewebb Posted April 11 Author Share Posted April 11 Thanks for the tip. Will pass information on to my husband and repair shop. Link to comment Share on other sites More sharing options...
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