An interesting question has been brought to my attention recently: Can a deaf person be a competent, safe mechanic?

I say yes. Hell yes, actually. The simple reason is that there is no reason a deaf mechanic can't kick ass.

Every 3 Months or 3,000 Miles
Whether a mechanic works for a Ford Dealership or Shade Tree Inc, there is a lot of general maintenance to be done. oil changes, cooling system flushes, A/C recharges, tune ups and even rotating your tires are part of regular maintenance throughout the life of your car. What's so special about these procedures? Not a damn thing.

I, along with the rest of e2's gearheads, could do those things with half our brains tied behind our backs. You don't need to hear anything to anticipate and perform any of the above maintenance. Even if you screwed up, there will be the visual clue of a leaking fluid or dye in the case of A/C system. You also don't need hearing for tire mounting, balancing or patching, alignment, brake jobs, or electrical system inspections. Even alternator / battery / starter problems can be chased down with simple current tests if you can't isolate the failing component by ear. A mechanic could perform enough of the maintenance encountered in a busy garage to stay well paid.

Light Maintenance
Nowadays, every car has idiot lights and an onboard computer system that monitors various sensors throughout the car. If problems are detected, a light notifies the driver and the problem is stored as a code in the car's computer. So all the driver has to do is say "So, like. . .this light totally came on and I was like 'We're out of gas!' but then I realized it was the car-thingy light so yak yak yak" and so on until the mechanic appreciates being deaf. Point is, for a large part of engine related problems, small diagnostic computers can tell a mechanic exactly what is wrong with the car. TPS, oxygen sensor, EGR valves all the way down to coolant reservoir levels have their own unique codes. The mechanic doesn't need to rely on his own hearing capability to isolate every problem in the engine.

What's more, no mechanic ever needed to rely on his own hearing capability to isolate every problem he faced. Do you ever go to a garage, throw your keys on the counter, and walk out the door? Hell no, you always tell the guy at the counter what symptoms or problems you've experienced. Of course you know there's something wrong, or you wouldn't be in there maxing out your Visa to pay for the replacement of your faulty canoodler valve.

Even if a customer has no earthly clue what makes their car stop, start and turn they do know when it makes funny sounds. They will tell you. Even if they just point you to a quadrant of the car, there is a small number of problems that are possible. Brakes? Shocks / Struts? Dead raccoon flopping around in the wheel well? Really, what the hell could be wrong (excluding the internal engine) that a good inspection won't catch? Not to mention the fact that a mechanic, regardless of their hearing, could probably detect the vibration of significant problems on a test drive.

"There's your problem."
The only problem I can imagine for a deaf mechanic is internal engine failures. Specifically, valve train failures could be a real pain. A mechanically challenged person may not realize that the noise they hear is a starving lifter. Of course, problems with the valve train could be determined but that would most likely involve a tear down that would run into a 4 figure labor fee in a hurry. Besides, events like this are so infrequent in a garage that I would imagine the job could be given to a different, non-deaf mechanic.

As opposed to the valve train, problems involving the crankshaft, rods or pistons are readily apparent, even to some trained monkeys. Similarly, transmission problems stand out without much input from your ears.

In short, I believe that a deaf mechanic can out perform a non-deaf mechanic. Some jobs will naturally proceed faster with the testimony of your ears, but that is not necessary. If a hearing impaired person did want to work as a mechanic, I see no reason why they could not be a competent, safe, productive member of any car garage. The majority of a garage's work will be routine maintenance or simple parts changes. With a minimal amount of experience, we could all perform these jobs without the need for our hearing. A simple shuffling of tasks could ensure that a deaf mechanic could stay busy with any number of assignments while jobs that are more quickly completed with auditory help are tackled by the non-hearing impaired mechanics. The business gets to keep on keepin' on and customers get screwed over on their canoodler valves.

There's a lot to be said for helping less-than-able bodied people into the professional world through specialised education and training. You don't have to have vision to be a telephone operator, you don't need legs to be a wicked computer programmer, and even if you are paralyzed from the neck down, you can be an amazing film critic.

However, when someone suggested to me that they were involved in a project to open a school which was aiming to train people who were deaf to become automotive mechanics, I had my doubts. Can someone who is unable to hear anything work on a car? Sure. But probably not to the same level as a mechanic with fully-functioning hearing can.

Hobby mechanics rely heavily on hearing when diagnosing problems in the engine. A running car is, in fact, a symphony of sounds playing together. Professionals have access to more equipment, but hearing still needs to be a weapon in the arsenal.

Diagnosing problems by sound.

A thumping sound that subsides over time can be a flat-spotted tyre. An intermittent hissing sound from under the bonnet can be a leaking exhaust manifold. A constant hissing sound can be a leaking intake manifold, a problem with the air filter, or a leaking / malfunctioning vacuum hose, or the perfectly normal sound from a turbocharger. A ticking sound from the rear of the car can be a failing U-joint. A whining sound from the wheels when braking can be a brake disc failure. A thumping / thunking sound from your wheels as you are turning through a corner can be a failing CV joint or driveshaft. A whining sound can be a slipping auxiliary or ventilator belt. A rapid clicking sound from under the bonnet can mean a problem with the valves, tappets or cams in the engine. A rumbling sound could be a problem with the engine mounts, a gearbox problem, or a sign of something more serious amiss...

The list goes on, and a good mechanic can take a car for a quick spin around the block, and diagnose a long series of problems just by the sound.

The other issue is that people will frequently bring in cars with complaints along the lines of 'the car makes a funny noise when I...', or 'lately, the car is making more of sound X when I drive normally'. The problem is that people don't know the difference between a 'clicking' sound, a 'knocking' sound or a 'tapping' sound, while to a mechanic, there is a massive difference. If the mechanic is unable to replicate the problem (due to not being able to hear the sound), the fact that there is 'a sound coming from the engine' doesn't help diagnosis any.

Working around sound-diagnosing problems

Many of the problems identified by sound are also present as vibrations: A vibration felt through the steering wheel could be a bearing or hydraulic problem. A vibration felt throughout the whole car could be a wheel or suspension problem, etc. But many problems are simply 'drowned out' with the regular sounds and movements of an automobile, making diagnosis extremely difficult.

With some other problems, the problem just might be more time consuming: If a car refuses to start, a mechanic gets in the car, and tries to start it. If it fires briefly, you know you might have a fuel delivery problem or ECU problem on your hands. If it does nothing at all, you know it might be an electrical power delivery failure, or some sort of safety device. All of this can be done without any sort of hearing being involved, but there are some things a good mechanic will listen for.

A fuel pump, for example, normally difficult to access, it doesn't heat up, and it doesn't vibrate. The quickest way to find out if it is working is to listen for it. If it makes a sound, it works. If it doesn't, it is malfunctioning. A deaf mechanic could easily waste an afternoon trying to find a problem that a mechanic with full hearing would have picked up within seconds.

The problem, then, is in the parts of the engine that aren't visible, which means 'most of the internals'.

Turning it into team-work

Of course, if an able-hearing mechanic were to do the diagnosis, a deaf engineer could do the work to rectify the problem – the fuel pump problem described above, for example, would be a time-consuming job, but it is pretty straightforward to replace the pump, and no hearing is required.

Some jobs, like a full engine rebuild, are a nerve-wracking activity, especially in the first couple of seconds after re-starting the engine for the first time. Thing is, if something is amiss, spotting the problem is often sound-based before any vibrations or visual clues come into it. Furthermore, if you were to fail to react to a sound in this situation, you could easily do permanent damage to an engine.

For engine work, this means that a deaf person can at best be an assistant to an able-hearing mechanic. They would no doubt be a very useful assistant, but I believe it would be impossible to fully be able to diagnose, maintain, and service all aspects of a car.

Safety

One issue that I believe is too easy to ignore in this question as well, is safety. Cars and garages are inherently dangerous places: Explosive fluids, heavy machinery, sharp edges, quickly-rotating parts, and high-temperature items are all around. A lot of accidents are avoided narrowly by one mechanic spotting something about to go wrong, and shouting.

If you are working underneath a car on a ramp, and the ramp starts creaking, you'd get the hell out of there. If you are deaf, you'd never get the warning signal in time.

By working to a rigorous health-and-safety regime, a lot of these problems can be avoided, but many mechanics would be hesitant to having to live with losing the extra layer of safety offered by a 'WATCH OUT', when necessary.

What deaf people can do

I think there are many tasks within automotive repairs where you don't need a sense of hearing. Body work, paint work, suspension set-up, interior re-trimming, cooling systems, heating systems, air conditioning, tyres, wheels, brake systems and detailing are all tasks that don't require hearing – as long as adequate measures are in place so safety isn't jeopardised.

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