The exhaust manifold is usually a single pipe that delivers exhaust fumes from cylinders to the outside exhaust pipe. Exhaust fumes are dangerous because they carry the colorless, odorless poison called carbon monoxide, and a leaking exhaust manifold may allow carbon monoxide into the cabin of the vehicle when the vents are open.
Here are four signs to look for when you suspect a manifold leak. A cracked pipe in the exhaust manifold rigging is a sure sign that it is leaking. This rigging is underneath the car; thus, in order to check the piping, you will have to put the car on a lift. If there is a leak, you will often hear an increased noise volume near the engine when you start the car. Keep in mind that there is a gasket that mediates between the engine block and the actual exhaust manifold piping. Like the piping itself, this gasket goes through the stress of a constant heating and cooling cycle.
In other words, if the crack is not visible in the pipe, an indicator of a bad manifold could still show in a blown gasket. Step on the accelerator and listen for noises that seem out of place. Sometimes you can detect the sounds of the exhaust fumes leaking through, but the problem with this technique is that it can be difficult to distinguish these noises from that of a normal engine. Noises with the engine can be the result of many other car problems, so it can be hard to know whether this indicates a manifold problem or not.
If you hear sputteringthen you know that there is a leak somewhere. Again, check the other symptoms to distinguish an engine manifold leak from other leaks. Even though carbon monoxide is odorless, other exhaust fumes are not, and if your manifold is leaking, these odors will be stronger than normal. If your car seems to be producing more noxious exhaust than usual, it may be time to schedule an appointment at the repair shop.
Vehicle Care Vehicle Repairs.An internal combustion engine can suffer from a problem like an exhaust manifold leak.
Imagine the toxic fumes produced by the engine is going back again inside the car. Deadly, right? The exhaust manifold prevents those gases from leaking back into the vehicle. You should take immediate repair action if suspected a leak in the exhaust manifold.
Delaying will lead only to bigger damage such as the catalytic converter, which means more expensive repair work. So, how do you know that there is something wrong with this component? The warning signs are quite easy to catch actually—you hear a ticking sound or smell exhaust gases coming from the engine compartment. Do a visual inspection if you detect any of these signs. Black soot around the downpipe connection and manifold is almost a surefire way to tell that there is a leak.
Some other symptoms include:. Leaked manifold gases damage surrounding components over time. The list of the havoc it causes are:. The occurrence of these problems depends on the location of the leak. There is less chance of damage when the leak is far from the catalytic converter and the engine. Due to extreme heat, the metal in the gasket goes through continuous expansion and contraction. This could cause a leak in the gasket, leading to bigger troubles over time.
The manifold gasket is responsible for sealing the whole exhaust system. A leak means the system is not properly sealed, affecting the drivability and performance of the car. When the gasket fails to perform, you will hear a noise in the exhaust when starting the car.
But it will fade away after some time. The reason causing manifold cracks is similar to a leak occurs in the gasket. It starts as a hairline crack and creates noise when you start the vehicle.
However, the crack gradually expands over time and the exhaust noise becomes persistent. You should repair it before reaching that point. A broken or loose stud or mounting bolt could be the reason for a leak in the manifold.
These bolts and studs wear out due to the continuous heating and cooling cycles, creating a crack or hole in the manifold.The exhaust manifold is a component of the exhaust system of a vehicle that connects to the cylinder head of the engine and collects gases and combines them from individual exhaust ports through to the rest of the exhaust system. Exhaust manifold gaskets can often crack with age and because of the frequent cycles of heat and cold that it is exposed to.
Metal in general expands and contracts as the temperature changes; manifolds and gaskets are no different in that and over time this change in size and shape affects even the casting of the metal and the manifold or the gasket may begin to crack.
Material : Many exhaust manifolds are created out of cast iron, although a few are made of tubular steel or stainless steel. You might also find that a catalytic converter is a part of the overall exhaust manifold system.
Size : There are a wide range of sizes of exhaust manifold gaskets that fit each particular vehicle and also the year that the vehicle was manufactured makes a difference in which part you will need.
Note : Exhaust manifold gaskets are often sold as part of the exhaust manifold itself, and are in fact considered part of the mounting hardware. Caution : Do not purchase used exhaust manifold gaskets. As these are the least durable part of the manifold system, used gaskets are unlikely to last a long time. The entire exhaust manifold and gasket system is required in order to keep your passengers safe and your car within emissions-testing standards.
Keep them in top shape by replacing the gasket and manifold when needed. YourMechanic supplies top-quality exhaust manifold gaskets to our certified mobile technicians.
We can also install an exhaust manifold gasket that you've purchased. Click here to get a quote and more information on exhaust manifold gasket replacement. The most popular service booked by readers of this article is Exhaust Manifold Gasket Replacement. Our certified mobile mechanics perform over services, including diagnostics, brakes, oil changes, scheduled mileage maintenances, and will come to you with all necessary parts and tools.
Our certified mobile mechanics make house calls in over 2, U. Fast, free online quotes for your car repair. Exhaust Manifold Gasket Replacement Cost. Service Location. Home Articles. The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details. Excellent Auto Repair Ratings.Engine exhaust manifolds are the metal components that are responsible for collecting exhaust gases and transporting them to the exhaust for expulsion from the tailpipe.
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They are bolted to the engine cylinder head s and are sealed using a gasket known as the exhaust manifold gasket. The exhaust manifold gasket is usually a multi-layered gasket that contains metal and other materials that are designed to provide the best seal possible. As the exhaust manifold gasket is the first in the exhaust system, it is a very important seal that should be inspected if any problems arise.4 Signs of a Catalytic Converter going Bad Failure Symptoms P0420 Clogged
When it fails or has any issuesit can cause all sorts of problems for the vehicle. Usually a bad or failing exhaust manifold gasket will produce a few symptoms that can alert the driver of a potential issue. One of the first symptoms of a problem with an exhaust manifold gasket is an excessively noisy engine. A faulty exhaust manifold gasket will produce an exhaust leak that will sound like a hissing or tapping sound coming from the engine. The sound may be especially pronounced during a cold start or during acceleration.
Engine performance issues are another common symptom of a problem with an exhaust manifold gasket. If the exhaust manifold gasket fails, the exhaust leak can result in engine performance issues such as a decrease in poweraccelerationand even fuel efficiency. The performance decrease may be minor at first, but will worsen over time if not addressed. Another symptom of a potential problem with the exhaust manifold gasket is a burning smell from the engine bay.
If the gasket fails and leaks near any plastic components, or engine wiring, the heat from the exhaust gases may cause the components to burn up. This may result in a burning smell coming from the engine bay as a result of the components being exposed to such high heat. The smell may sometimes be accompanied by faint smoke.
Any sort of burning smells should be checked out as soon as possible to make sure that they are not a potential safety hazard. Exhaust manifold gaskets are one of the most important gaskets of an engine, as they are the main gasket that seals and pressurizes the entire exhaust system. When the exhaust manifold gasket, or gaskets fail or have an issue, it can cause problems with the performance and drivability of the vehicle. If you suspect that you may be having an issue with your exhaust manifold gaskets, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if your vehicle needs an exhaust manifold gasket replacement.
The most popular service booked by readers of this article is Exhaust System Inspection. Our certified mobile mechanics perform over services, including diagnostics, brakes, oil changes, scheduled mileage maintenances, and will come to you with all necessary parts and tools.If you use a gasoline-powered V-8 pickup or SUV to tow a trailer, chances are you're going to eventually have an exhaust leak caused by broken manifold bolts or studs.
We have a Dodge Durango with the aluminum-head 5. The passenger and driver exhaust manifold bolts let go at roughly 70, miles and we had them replaced by the dealership under warranty. Then, at aboutmiles the driver-side exhaust studs snapped. We got really lucky and those particular studs snapped off with about 1-inch of exposed stud shaft sticking out of the cylinder head.
Furthermore, the broken studs were only in finger-tight, so we were able to just spin them out and replace the gasket and bolts with little drama.
Exhaust manifold gasket replacement
Most recently atmiles the passenger side started the telltale "tick, tick tick" when the engine was cold. Once the vehicle was driven a short distance, the manifolds swelled up and the tick was mitigated, but we figured we'd highlight the fix before it got too severe. Why You Should Fix an Exhaust Leak Under extreme use like towing heavy loads, the exhaust manifolds can go from normal operating temperature to cherry red in a matter of seconds.
After hundreds of expansion and contraction cycles, the studs or bolts finally fail. It's not too dissimilar from bending a paper clip back and forth.
Eventually it's gonna come apart in your hands. With only part of the manifold cinched tightly to the engine cylinder head, the exhaust gasket will blow out, not only allowing exhaust gases to escape, but possibly allowing air to enter the exhaust stream, throwing off the O2 sensor's readings.
If the O2 sensor thinks the engine is running leaner than it should, it will trigger more fuel to be dumped into the engine, potentially causing harm to the catalytic converter s.
Also, the exhaust manifolds can expand and contract unevenly, which could cause the cast iron to crack, compounding the incorrect O2 sensor readings, not to mention making the annoying exhaust leak sound worse.
Getting Access to the Engine Every vehicle is different, but on this Dodge Durango it's easiest to gain access to the exhaust manifolds by jacking up the vehicle, removing the front tire, and then taking out the inner fender liner. We put a jackstand securely under the framerail and then got to work.
Once we had access to the manifold we soaked the bolts with penetrating oil to help them come out without snapping. If you live in an area that uses road salt or you experience a lot of rain, snow, or ocean spray, you'll probably want to devote a couple days to soaking the bolts repeatedly with penetrating lube. This vehicle has been in SoCal its entire life so we just let them soak for a couple hours before proceeding.
If you need more parts, it's best to order before you tear your vehicle down. It will help prevent further snapping and more work.Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.
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Oil looks normal and coolant as well apart from being low. Car seems to start to overheat once the heater is on but will start to cool down once the heater has been turned off. Will be taking the car to work to get a pressure test done but thought to see what other might think. Hoping for just an exhaust manifold gasket problem haha.
If coolant is leaking check the head bleeds it could be running around from the head bleeds.
If it's comming from the exhaust then it's not very good and likely a crack. Ryan Licastro Member. Fu Manchu Well-Known Member. What is odd is that the heater never turns off in the VE.An exhaust-manifold gasket is more likely to need renewing than the gasket on the intake manifoldbecause of the greater damage caused to the exhaust system by heat; but the procedure is much the same for both.
A 'blown' exhaust gasket can be detected by excessive noise from the exhaust, and by white burn marks around the manifold flange. The intake and exhaust manifolds may be on opposite sides of the cylinder heador they may be combined or bolted close together.
If the engine has a V-configuration, there will be exhaust manifolds on the outer side of each cylinder bank, but probably just one intake manifold located in the centre of the V. Apply penetrating oil to all nuts or bolts which have to be undone, including the exhaust-pipe clamp fixing. When the nuts or bolts are removed, the remains of the old gasket may cause the manifold to stick: tap the manifold with a rawhide hammer to loosen it. If any manifold studs are broken or damaged, remove them using self-locking grips, two nuts and a spanner, or stud remover.
With the manifold off, carefully scrape all gasket-mounting surfaces clean of dirt and bits of the old gasket. Do not allow particles to fall into the manifold or the cylinder head. Check the manifold to see that it is not cracked or damaged; check its face with a straight edge — such as a steel ruler — to see that it is not warped.
If it is, replace it. Fit a new gasket, making sure that it is the right way round, with all holes lined up. On some engines a gasket may be in two or three pieces, or inserts may be fitted; be sure all parts are properly aligned. Some water-heated intake manifolds, particularly on V-enginesrequire gasket sealant on each side of the gasket, because the larger water passages are more prone to leakage. Reassembly is in the reverse order of removal.
Tighten the nuts on the manifold, using a torque wrench adjusted to the setting recommended in the car service manual. The tightening sequence is usually from the centre of the manifold outwards to the ends. After reassembly, run the engine to working temperature, switch it off and check the torque settings.
Remove the air cleaner. Make a careful note of all the connections to the carburettor. Disconnect the choke and throttle cables to the carburettor. Then take off the fuel pipe.
If possible, keep the disconnected end of the fuel pipe higher than the level of fuel in the fuel tank. If the carburettor has an automatic choke, disconnect the water pipes or wires at the choke. You may have to remove the carburettor completely See Removing a carburettor for cleaning before you can remove the manifold.