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Username Post: Nomad Exhaust Fumes        (Topic#281378)
MadMonty 
Member
Posts: 24
MadMonty
Loc: Virginia
Reg: 04-12-03
05-20-12 01:43 PM - Post#2227931    

Since completion of my '55 Nomad, I have had re-ocurring issue of exhaust fumes in the cabin. Entire exhaust system has been checked, no leaks. Have re-positioned twin pipes to exit diagonally at corner of rear bumper, instead of straight back near bumperettes. Have installed additional weather stripping on tailgate. Still getting fumes in cabin. Anyone have any ideas/experience with this issue? Thanks!



 




swbatt 
West Coast Show Support
Posts: 4089
swbatt
Reg: 03-25-01
05-20-12 06:15 PM - Post#2228017    
    In response to MadMonty

Have you got the piece between the rear bumper and the lower rear body?


"Which do I prefer? Chess or sex? It depends on the position." - Spassky


 
MadMooks 
Thread Sponsor
Posts: 1878
MadMooks
Loc: California
Reg: 05-07-01
05-20-12 10:25 PM - Post#2228063    
    In response to swbatt

has your liftgate been straightened? if it hasnt and needs straightening it might not be sealing properly. this is just my guess. the rear lifgate and tailgate never seal properly, and a liftgate that still has a twist definitely doesnt help. if you need more info on this, email me directly at michaelbakotich@ca.rr.com any pictures of your liftgate would help me assess it.

MadMooks Nomad Parts
www.madmooks.com

55 and 57 nomad


Edited by MadMooks on 05-20-12 10:28 PM. Reason for edit: No reason given.

 
tewitt1949 
Contributor
Posts: 255
tewitt1949
Reg: 10-17-09
05-21-12 03:48 AM - Post#2228105    
    In response to MadMonty


I just got mine on the road and have driven about 400 miles. My tail pipes exit at the very rear corners of the bumper and point downward and outward a little.. I do have the tail pan seal and my lift gate was straightened by madmooks. So far no gases inside the car. Not sure what attribitued to my my clean air inside, maybe all above helped.



 
MadMonty 
Member
Posts: 24
MadMonty
Loc: Virginia
Reg: 04-12-03
05-21-12 04:07 PM - Post#2228354    
    In response to swbatt

That's a good question, I dunno! I did not do the build, my best friend did (yes, we are still best friends!). Could you say a bit more about what piece you are referring to, and I will check it out. Thanks so much for your help!



 
MadMonty 
Member
Posts: 24
MadMonty
Loc: Virginia
Reg: 04-12-03
05-21-12 04:10 PM - Post#2228357    
    In response to MadMooks

I had my liftgate straightened by Jerry C. In California. Crated it up and shipped it out. I have had one person mention that the liftgate still looked a bit "tweaked" when I was at the CNA convention last year, so maybe it still needs work, as Jerry could not see it reinstalled on the car. Thansk for your help!



 
MadMonty 
Member
Posts: 24
MadMonty
Loc: Virginia
Reg: 04-12-03
05-21-12 04:12 PM - Post#2228358    
    In response to tewitt1949

Glad you have a "clean ride"! Ha! I will check out the tail pan seal! Thank for your input!



 
MadMonty 
Member
Posts: 24
MadMonty
Loc: Virginia
Reg: 04-12-03
05-21-12 06:07 PM - Post#2228396    
    In response to MadMonty

SWbatt, this looks like the seal you mentioned, right?
55 Body to Bumper Seal Return to Products...
Item Number: 10167
Item Name: 55 Body to Bumper Seal
Item Price: $24.00
Item Description: This seal mounts on the rear pan between the body and bumper to seal out dust and dirt. Priced each.
For the following: 1955, Bel Air, 210, 150, Hard top, Sedan, Sedan Delivery, Station Wagon, Nomad, Convertible, 2 door, 4 door, 6 Cyl., V8






 
Nomad Jack 
Senior Member
Posts: 805
Nomad Jack
Loc: Cape Cod, Ma.
Reg: 03-14-03
05-22-12 03:31 AM - Post#2228513    
    In response to MadMonty

Have not experienced exhaust in the cabin other then when I first finish the Nomad and the oil and paint was burning off the exhaust system. My exhaust exits straight back with the tips under each bumperet and even with the rear edge of the bumper. I do not have the seal you are talking about, but I have had the gate straightened and it seals reasonably well, not completely water tight.



Nomad Jack
55 Nomad
http://www.jaxcars.net/55-chevy-nomad.html
57 3100 Pick-up
http://www.jaxcars.net/57-chevy-pick-up.html
31 LT Truck
http://www.jaxcars.net/31-chevy-truck.html
53 CJ3B Jeep
https://www.jaxcars.net/1953-cj3b-willys-jeep .html


 
Henrys57wagon 
Canadian Regional Coordinator &"12th Year" Silver Supporting Member
Posts: 3171
Henrys57wagon
Age: 68
Loc: Carleton Place ON, Canada
Reg: 04-15-06
05-22-12 06:45 AM - Post#2228578    
    In response to Nomad Jack

I did not install a seal at the rear bumper either and no exhaust smell. My exhaust exits just before the bumper, good day.


57 B/A wagon, 408"BB with 14' Bonair travel trailer,71 Nova 355"SB, 07 2500HD with 26 Prowler 5th wheel, 09 Impala LT, John Deere lawn tractor,
http://www.picturetrail.com/sfx/album/listing/use r...


 
cnbell 
Deceased
Posts: 9224
cnbell
Loc: So Cal
Reg: 04-14-04
05-22-12 09:45 AM - Post#2228625    
    In response to Henrys57wagon

The lower pan seal is a dust seal to prevent dirt from blowing up on the back of the car and back window, I don't think it would do much for exhaust fumes.

I would guess it's getting in either through the back gate or window or possibly from under the car. Any open holes in the spare tire well ?

Check for leaks at the mufflers and joint welds.

Craig

http://www.picturetrail.com/cnbell


 
MadMonty 
Member
Posts: 24
MadMonty
Loc: Virginia
Reg: 04-12-03
05-22-12 02:39 PM - Post#2228719    
    In response to MadMonty

Finally got a chance t look and I do not have the tail pan seal! Will proced to order and hope this helps. Thanks again!



 
MadMonty 
Member
Posts: 24
MadMonty
Loc: Virginia
Reg: 04-12-03
05-22-12 02:42 PM - Post#2228720    
    In response to cnbell

Thanks for the suggestions, have checked all of that-just had a new exhausr syestem put on from the headers back-tight as can be. No holes in the floors or spare tire compartment.It is coming from somewhere and by process of elimination by gosh we will pinpoint it. Thank you!



 
MadMonty 
Member
Posts: 24
MadMonty
Loc: Virginia
Reg: 04-12-03
05-22-12 02:59 PM - Post#2228725    
    In response to Nomad Jack

Thanks Nomad Jack! My twin pipes used to exit right where your's do, but stuck out about an inch or so past the bumper. In the middle of my trip I was so frustrated with fumes (after completely taping off the tailgate and liftgate!) I pulled into a custom exhaust shop and ended up having everything re-done from the headers back, and re-positioned the exhaust tips to exit diagonally at the very corner of each bumper, thinking that would shoot the fumes out back and to the side. Still getting fumes! I do need to double check for leaks where the headers connect to the manifold. Thanks for your input and glad you have a "clean ride"!



 
cdmhenry 
Very Senior Member
Posts: 2403
cdmhenry
Loc: Minden, NV.
Reg: 09-14-00
05-22-12 07:29 PM - Post#2228817    
    In response to MadMonty

It's exhausting....

Go to a good exhaust shop and have them pressurize your exhaust with a smoke machine. You'll find the exhaust leak immediately.
If tht's not the problem you could be piping exhaust into the quarter panel cavity. There are few openings there, but enough to be worth checking into.
Lastly, why is your exhaust so evil? What about a tune up? I was able to survive my leaking liftgate and lost exhaust extension for several hundred miles. I could smell it and knew i would have to fix it, but it would not have made me stop at an exhaust shop.

OK. Not quite lastly... Check your headers for leaks between the primaries near the collectors.

Every Government Interference In The Economy Consists Of Giving Unearned Benefit, Extorted By Force, To Some People At The Expense Of Others - Ayn Rand


 
MadMonty 
Member
Posts: 24
MadMonty
Loc: Virginia
Reg: 04-12-03
05-23-12 09:32 AM - Post#2228980    
    In response to cdmhenry

Thanks for your suggestions cdmHenry! Especially preasurizing the system with smoke-as for the tune-up,it is carbureated, and I do think it is running a bit rich judging from the blackened tail pies-good point. I will follow up on each of your sugestions-thanks!



 
Nomad Jack 
Senior Member
Posts: 805
Nomad Jack
Loc: Cape Cod, Ma.
Reg: 03-14-03
05-30-12 03:42 AM - Post#2231392    
    In response to MadMonty

I was getting the Nomad out of winter storage, cleaning her up and getting my inspection sticker last Friday. In detailing the engine I had unplugged some sensors and the injectors so I could better clean and polish. When done, went for a ride and got the inspection sticker, then I went and picked up the wife and we headed out for lunch, and she commented that it smelled and she was correct. When I went to start up the Nomad, it started real rough and the idle speed was faster then normal. I was thinking it the gas went bad sitting over the winter, and by the time we got home, it really did have a strong smell. Ended up being the H2O sensor wasn’t connected so the computer didn’t now how hot the engine was and I guess was richening up the mixture. As soon as it was reconnected, the idle speed dropped and the smell went away. The point of this long tail, the suggestion to check the engine tune is a good one.

Nomad Jack
55 Nomad
http://www.jaxcars.net/55-chevy-nomad.html
57 3100 Pick-up
http://www.jaxcars.net/57-chevy-pick-up.html
31 LT Truck
http://www.jaxcars.net/31-chevy-truck.html
53 CJ3B Jeep
https://www.jaxcars.net/1953-cj3b-willys-jeep .html


 
MadMonty 
Member
Posts: 24
MadMonty
Loc: Virginia
Reg: 04-12-03
06-10-12 02:57 PM - Post#2235521    
    In response to Nomad Jack

Thanks Nomad Jack-as per an earlier suggestion, I appear to be running pretty rich.



 
johnminton 
Poster
Posts: 11

Reg: 04-11-18
04-15-18 01:37 PM - Post#2731066    
    In response to MadMonty

Old trick. Run the heater blower and draw outside air source (Windows up). This pressurizes the cabin. If the source is from outside the smell will go away.



 
vabeach56wagon 
Valued Contributor
Posts: 3118
vabeach56wagon
Loc: Chesapeake,VA,
Reg: 04-22-02
11-15-18 10:16 AM - Post#2751479    
    In response to MadMonty



I ran the rear tips out to the edge of the quarter panel, with an angle cut parallel to the sheet metal. Even with the liftgate open, we never had any exhaust smell or fumes in the cabin.

paul

Original builder of the Gobstomper - '56 210 9 passenger wagon now in other's hands. Current Ride is '69 X33D80 Z28 Camaro



 




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