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I just got the new exhaust system for the 28 coach from Parks Pipes. The old system not the right one at all and had a different type oval muffler and a homemade heat stove. Question 1, How does the pipe connect to the manifold and is there a clamp at that point? Question 2, is there a clamp at the back of the muffler to attach the tail pipe or was it welded or left loose for when the frame moves? Qusetion3, How many hangers hold it all up?
28 Chevy LO Capitol 1 ton, 28 National 2 dr coach, 71 Chevy Custom Camper 3/4 ton. Also 23 Oldsmobile Economy truck and a 24 Olds sport touring.
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Joined: Dec 2001
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Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
Joined: Dec 2001
Posts: 10,379 Likes: 1 |
I can answer part of your questions. A) A clamp is not used at the connection to the exhaust manifold. B) Not sure about that question. A clamp is NOT listed for that location. C. There is a band around the muffler which counts as one hangar. There is a bracket that is mounted on the frame cross-member and clamped to the tailpipe. Reference: Parts Price List, NATIONAL, Series AB-1928, Effective April 1, 1928. Also Lubrication Chart in INSTRUCTIONS, NATIONAL, Series AB, Sep 1, 1928
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: Dec 2001
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ChatMaster - 750
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ChatMaster - 750
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Bob,
1. The take down pipe to manifold pipe is a slip fit with no clamp. Note that the manifold outlet pipe has two grooves in the outer surface. What I do is use some old style pipe fitters asbestos rope. Unwind the rope to obtain smaller strands. Wrap the manifold outlet pipe grooves with the strands of rope to make a seal, Force the exhaust pipe upward over the fabricated seal. Once you wrap and secure the band type strap around muffler, the system is trapped in position.
2. Directly above the tailpipe/muffler connection you should see a 3/8" dia hole in the front surface of the frame crossmember. From that hole (only one, believe it or not) a 1/8" thick, 3/4" wide piece of strap iron is suspended downward to just below the bottom of the muffler/tailpipe joint. Below the frame crossmember the strap is twisted 90º so that the flat surface is positioned fore and aft, parallel with the pipe. A "U" bolt/saddle style clamp was used, requiring two holes in the strap hanger, which supports the muffler/tailpipe assembly.
Originally, what is described above is how Chevrolet installed the exhaust system with the short tailpipe. Midyear a longer tailpipe was released but still no provisions for additional tail pipe support. In the November time frame Chevrolet released a tail pipe hanger between the gas tank right support strap and a second hanger at pipe kickup area above the rear axle between the pipe and the frame right side member. With out these additional hangers in place, you'll probably have a tail pipe that will wag like a dogs tail when the vehicle is driven. There's a sketch of the added hangers in November issue of the 1928 Service News.
Dick Oldenburg
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ChatMaster - 15,000
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ChatMaster - 15,000
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Bob, The two posts above this one describe the supports or lack of them on a '28 Chevy passenger car and 1/2 ton truck. It takes combining both to get an accurate picture in your mind.
Let me try to summarize.
As Richard pointed out there is no clamp on the exhaust pipe at the manifold. A rope type packing was used here.
The muffler was attached to the exhaust pipe without a clamp. Never saw an original setup so don't know if it was a force fit or welded. It was not clamped. I suspect a force fit only. The muffler is supported by a bracket riveted to the frame with one rivet. The bracket is arc shaped to accept the muffler. A steel band end is fed into a slot nearest to the frame and then a 4-6" length is bent in a "U" and fed into the adjacent slot nearer to the vehicle center. This 4-6" length will be held in place once the muffler is held in place. The other end of the strap is fed into the slotted end of a special bolt that looks like a flat ring formed onto a 1/4-20 threaded stud. Again the strap is bent around the slot with 4-6" end extending through the slot. Make the bend so that when the band is rapped around the bottom of the muffler the end will be between the strap and muffler. That will hold it in place. The threaded end of the special bolt is fed into a hole in the inboard end of the bracket, a special rounded bottom spacer installed (only have ever seen one of them), then lock washer and nut. If you have positioned the bends just right then when the nut is tightened the muffler will be held tightly between the bracket and band.
As Ray & Richard posted a clamp/support was installed on the tail pipe and the cross member behind muffler. I don't believe the clamp was separate but part of the strap that extended around the pipe and was held in place an tightened with a single bolt through the strap. That is based on a 1931 strap in approximately the same location. Most of us use the separate strap and "U" bolt arrangement.
Richard then documented the later changes.
Guess that was more than a summary?
Last edited by Chipper; 08/09/10 04:04 PM. Reason: Summary?
How Sweet the roar of a Chevy four!
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Joined: Feb 2008
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ChatMaster - 750
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OP
ChatMaster - 750
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Wow! Great info guys! Thank you very much! Saved me a ton of work digging Dads 28 coupe out of the clutter and looking at it. His car still had the original exhaust system on it back in the mid 70s when Bill Mc Dowell at Packard Farms came out and took the car to his place and copied it to make the reproduction system that Parks Pipes now sells. He also took Dads 21 490 with the original system and copied it as well. Both cars are now buried behind 35 years of stuff and would take a couple days work to get under them. I plan on putting everything in this friday so if I run into a snag, I will let you know. Thanks again! PS Hey Richard, the vac tank is still working great!!
28 Chevy LO Capitol 1 ton, 28 National 2 dr coach, 71 Chevy Custom Camper 3/4 ton. Also 23 Oldsmobile Economy truck and a 24 Olds sport touring.
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