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Understanding Main Gears Vs. Planetary Gears
Aspiring mechanics spend hours learning about how main gears and planetary gears work in a car transmission, so a full dissertation simply isn’t possible within this relatively brief article. If you’re curious...

Related questions

Question
Starts only when moving flywheel
Hello there, there are a few potential reasons for why your car will only start when the flywheel is turned. The most common would be the crankshaft position sensor, weak or binding starter, or a faulty cam sensor. If you...
Question
Starter motor keeps running after car starts
Assuming that it is not an electrical issue (e.g. somehow power is NOT being cut once you release the key from the "start" position) you have a mechanical flaw with the starter. It is hard to say from your description...
Question
rubbing or rotating type of sound from rear wheel passenger side
Hello there. A few potential problems could cause a rubbing noise from the rear of the vehicle. The most common would be the wheel bearings, brake drum, dragging parking brake, or damaged wheel. If you want to have this looked...
Question
truck is ticking.
Hello, thanks for writing in about your 2001 Grand Cherokee. It is possible that a cracked flywheel will make noise and also cause the crank position sensor to be given bad information. That may be the source of the Check...
Question
Clutch burning and smoking on 2013 Mini Cooper Countryman
Hello. Thanks for writing in about your 2013 Mini Cooper Countryman. It may be the clutch failing once more causing your condition, but it could also be a sticking brake caliper causing your brakes to overheat and smoke. Brake...
Question
Grinding noise and backfiring during startup
The starter on this vehicle requires a shim, so its possible that got left out when the starter was replaced. This could cause starter engagement problems and the metal on metal noise you're hearing. Backfiring, on the other hand, is...
Question
Grinding when 4WD is engaged
The best way to diagnose this problem is to have your vehicle inspected by a professional, such as one from YourMechanic. However, I can make some educated guesses about your noise. There is a Technical Service Bulletin (TSB) for your...
Question
Q: Wheel bearing
Wheel bearings can be difficult to locate which of the four is making the noise. I've spent to much time crawling around a car while another technicians drives attempting to figure out which bearing is making the noise. You can...
Question
I think my starter is misaligned.
This is often times a result of the starter solenoid being misaligned and not reaching out far enough to the flywheel. You will notice on the starter solenoid there are bolt holes that allow for a slight adjustment. This allows...
Question
I can hear a knocking sound coming from my front left wheel when brakeing at above 40 mph.
In may cases the knocking sound coming from the wheel area is caused by one of two issues; a warped brake rotor or the wheel bearings that are beginning to wear out. Vehicles made after the late 1990's (like your...
Question
Clunking noise from rear
Hi there. This is a somewhat common issue with the majority of the E90's and E46 BMW's. These motors have what is a called a dual mass flywheel which is commonly known for creating this kind of a slight clunk...
Question
When driving and going over 55 mph the car starts shaking like it is going to cut off.
Hi there! There are several reasons why your TL can act this way. First off, if this behavior is predominantly after the car has been sitting overnight or longer, it can be the result of "flat-spotting" - the low profile...
Question
2010 VW caddy 1.9 TDI- flywheel installation issue
I have to wonder if what you are actually looking at is a relief cut in the flywheel that is in the outer perimeter near the ring gear. It's hard for me to imagine that you could really do significant...
Question
Failed engine, flywheel came off as well
The only way to determine the failure mode of the bolts is to send the "assembly" to a forensic laboratory equipped with a scanning electron microscope. If the bolts were loose, there would have been noticeable vibration and noise prior...
Question
My clutch won't release at high RPMs
These are all aftermarket parts, and it cannot be verified whether the clutch disc and pressure plate will work together with the aftermarket flywheel. The flywheel and clutch components are not releasing at higher RPMs as a result of the...
Question
Flywheel to torque converter installation
Hello and thanks for contacting YourMechanic. The 2007 Dodge Durango could have had a different transmission. I suggest putting on the old flex plate that was on your old engine onto the newer engine. Then the bolts will align up...
Question
My car won't engage 1st gear 2006 Audi A4
Hi there - I believe the problem is more likely with the 1st gear set in the transmission. If the clutch works in one gear, it will work in all gears. While a bad flywheel would cause the vibration and...
Question
I had a wheel bearing replaced, now it seems to be worse 5 days later
I can see two possibilities. Either the bearing was damaged during the replacement, or the diagnosis was wrong and the wheel bearing was not the original problem. If the wheel bearing was damaged during replacement, then he is obligated to...
Question
should you lube the wheel bolts (lug nuts)?
There are several schools of thought on that, but most often, the manufacturers do not recommend lubricating the wheel nuts. Here is a link to an article about installing wheel nuts Some technicians and tire stores are careless about tightening...
Question
Rattling sound under the car.
Hi there. If you have a flex plate or a flywheel on your vehicle, the nose could be a loose bolt causing the rattling noise as the engine is running. If the noise lessens out as the engine is revved...

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