How to Make Exhaust Pipe Round Again
BEGINNERS' CORNER
Save Coin With Do-It-Yourself Exhaust Pipe Repair
By John Gunnell
When it comes to exhaust work, the all-time choice for a real collector car is a high-quality, rust-resistant stainless steel exhaust organization that will terminal the life of the vehicle and pay for itself many times over the years. All the same, many people won't pay the up-front cost of a stainless steel system. Mayhap they program to fix the car as cheaply as possible and "flip" (re-sell) it rapidly.
Exhaust pipage patches (section replacements) are non that difficult to practice. With a few tools and some elbow grease, one tin cut, trim and install a replacement tailpipe section and avert the price of a new pipe or a whole new system.
We have a 1954 MG TF roadster that's existence "fixed upwardly" as a depression-bucks project auto. We besides have an MG TD that's getting a frame-up restoration. The TF had a banged up old exhaust system that needed replacing. The restored TD will get a new stainless steel exhaust system. Nosotros did non need the old exhaust parts that had been removed from it. They included a nice stainless steel muffler.
The TD and the TF use an exhaust system. Our former TD organization had a crevice in the pipe merely behind the muffler, just otherwise the engine pipe was solid and it had the stainless steel muffler that nosotros bought on eBay. It too had a nice tubular type chrome-plated exhaust tip.
We decided to supplant an approximately 18-inch long department of the tailpipe where it had cracked. Welding a bracket on the pipe had caused this crack. Electrolysis from the welding process weakened the metal near the crevice. The residual of the pipe was very solid. We decided to replace the bad section.
To do this type of work you lot'll demand a chain-blazon exhaust pipe cutter, a replacement exhaust pipe department that fits — or tin be trimmed to — a workable length, plus a few U-commodities muffler clamps. You may take to use an expander tool to widen the replacement pipe at one end then it fits over the pipe being repaired.
This chain style pipe cutter is piece of cake to utilize. Y'all stretch the concatenation around the pipe and link it in place. And then clasp handle together and rotate the tool.
The piping cutter tool has a concatenation with cutting discs that fits around different bore pipes. The concatenation has pegs on information technology that claw into opening. Pick the opening that makes a snug loop effectually the piping you desire to cut. Believe it or not, as yous rotate the tool dorsum and forth, the discs volition commencement cutting into the pipe. As the cut gets deeper, you volition squeeze the "pliers" blazon handles to tighten the loop. Before long, the bad piece of pipage volition exist cut through and will drop off.
These chain cutters are intended for apply on exhaust tubing made of regular mild steel. However, we have used a good quality model to cut stainless steel and information technology worked fine. We cannot say if this volition shorten the life of the tool.
Next, you lot have to trim (and possibly shape) the replacement exhaust piping section so you can install it in place of the bad department you cut out. The platonic type of connection is a slip joint at both ends. The slip joints from the replacement piece usually fit over the pipes being joined. Slip joints are formed past expanding the ends of the replacement piping section. But in some cases, there may be no slip joints-just a straight pipage that slides over the pipes beingness joined.
When yous take a replacement pipe with one or two ends expanded to make slip joints, the reward is that the narrower pipe cannot slide back in forth within the larger diameter pipe. So if you are lucky plenty to get a proper length replacement section with both ends already expanded, a good repair should be uncomplicated. If you lot accept to widen (or expand) the replacement pipage at either or both ends, the job becomes just a little more difficult.
An cheap hand tool tin be used to slightly expand exhaust pipage fabricated of conventional mild steel. The wider department of the tool has a shaping die held together with springs that yous tap into the end of the exhaust pipage that'south to exist expanded. One time it sits tightly within the pipe, a large wrench is used to rotate the shaft, which spreads the dies outward and hopefully expands the tubing.
This manual exhaust pipe expander tool is readily available and comes in sizes to fit different bore tubing.
There are different sized tools of this type to fit inside different diameter frazzle pipes. This tool is really made for shaping the end of the piping prissy and round, only the exercise-information technology-yourselfer tin can employ the told to slightly expand the tubing. A more expensive version of the tool comes in a kit (about $175) that has several interchangeable shaping dies and a shaft designed to work with an air operated impact wrench. Neither D-I-Y tool is made for stainless steel frazzle pipes.
With this kit an impact wrench tin can stretch pipes. Collet sets expand pipes from i-5/viii in. to 4-1/4 in. The piping stretcher kit is a convenient, inexpensive alternative to hydraulic pipage expanders and has a molded storage example.
A nice section repair can be made by using a repair section that is already expanded to a proper size slip articulation on ane terminate. The repair piece can be measured and so cutting to the proper size to replace a damaged section. The expander tool tin can be used to slightly enlarge the diameter of the other side then information technology slips over the remaining good piece of exhaust tubing. In one case you had tight slip joints formed front end and rear, you tin use the proper size U-shaped muffler clamps to cinch things up tightly to eliminate exhaust leaks and noise. The good sections of the old frazzle tubing can exist coated with oestrus curing exhaust paint.
The pre-sized stop of this repair section slipped over the muffler extension in front and was of a blueprint that allowed used of the old hanger.
A conventional U-shaped muffler clamp made for a tight articulation at the muffler extension. What'due south called a "GM style" clamp with solid sides on the lower section will sometimes give you an fifty-fifty stronger joint.
Your section repair is complete. It is good practice to recheck the integrity of the system a calendar week or two later. Raise the auto and look for any signs of leaking exhaust gases, such equally a sooty spot well-nigh the joint. Re-tighten all fasteners tightly, simply lightly. In other words, you desire them snug, but remember that exhaust clamps are like shooting fish in a barrel to snap if over-tightened.
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Source: http://www.secondchancegarage.com/public2/exhaust-repair.cfm
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