Questions tagged [gears]

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13
votes
1answer
8k views

What differences are there between straight cut and helical cut gears?

in formula one, and most other motorsports they use straight cut gears as shown below. in most normal cars you will see helical cut gears as shown below. if both teeth are the same thickness the ...
18
votes
11answers
16k views

What's the best gear to leave a manual vehicle in when parked? [closed]

I've been told that reverse is the "strongest" gear, so in a manual transmission vehicle you should park your vehicle and leave it in reverse in the event of a parking brake failure. Others have said ...
3
votes
2answers
6k views

Why doesn't a car parked in first gear roll backwards?

In manual transmission, it is common practice to park a car in the first gear on uphills or in reverse gear on slopes - in addition to park brakes of course, but let's assume it is not being used in ...
7
votes
1answer
10k views

Why do we push start cars in second gear?

I always wondered why you have to be in second gear when push starting a car. I know what all the process does, so my thought is that it would be better to do it in first gear. I think this because ...
2
votes
0answers
35 views

Power Loss in lower gears

I have a 2004 Ford Mondeo 2.0 TDCI. I have heard about something called the EGR (Exhaust-Gas Recirculation) that can get clogged up and need cleaning. Is this right? Also, where would I find this on ...
7
votes
2answers
3k views

Hard shifting on 2003 VW Jetta 1,8 with manual transmission

After unrelated repair in the shop, my car began to have difficulties going into 5th gear. Gradually over the next couple of days, it was noticeable that the car refused to engage into 3rd, and now ...
2
votes
1answer
154 views

Car doesn't shift smoothly

I have a 2003 GMC Sierra with 60,000 miles on it. I have automatic transmission and just a few weeks ago, my car started having problems shifting gears. The best way to describe how the car feels ...
2
votes
1answer
364 views

“Keep in low gear” driving a gearless electric vehicle [closed]

Note: Don't know if the question is an adequate fit for this site. If I see a traffic sign telling me to "Keep in low gear" like the TRAVE COM O MOTOR | Keep in low gear I saw on a Portuguese highway,...
3
votes
0answers
6k views

Scania problem in engaging gears

I am having a problem in engaging gears on my truck series P124 R420. So I started by diagnosing and found no problem. Then removed the gearbox and changed clutch plate & pressure plate. Then ...
8
votes
4answers
2k views

Riding motor cycle in a slow moving traffic

While riding in a slow moving traffic should I keep on switching to neutral when I stop the bike or should I keep the bike in 1st or 2nd gear holding the clutch? Does changing gears frequently cause ...
1
vote
1answer
790 views

2001 Honda Shadow VT1100C2 Gears will only shift into 1st and 2nd

The CAM, GEARSHIFT will only turn 2 times. There are Five gears, And the gears on go into 1st and 2nd. The gears are very hard to shift into.
1
vote
0answers
49 views

Shift struck when try to put it in to 1st gear [duplicate]

I have a Nissan N16 car with a 5 speed manual gearbox. I have a issue with its shift. When I try to shift into 1st gear, it is very hard to put it in - but not in to other gears. I have to push harder ...
3
votes
0answers
97 views

How to adjust power for 1st & 2nd gear in classic 350?

i am facing loss of power with 1st & 2nd gear while accelerating after changing gears. As soon as RPM goes high the power becomes stable. I want to know that which type of setting should be done ...
10
votes
3answers
3k views

What stops a car window from falling down?

I have been trying to research how the gears of the crank mechanism of a car window works, either manual or electric. I want to know why it doesn't fall down from gravity. Can anyone link me to an ...
14
votes
1answer
3k views

Is reverse gear in a manual transmission equivalent to any other gear?

Question is pretty well summarized in the title. If we were to order gears in terms of power provided, where would reverse fall between gears 1-5 on a manual transmission vehicle? Does it vary by ...
13
votes
6answers
4k views

What would happen if you shifted into reverse while you are going forward?

First, I am talking about manual cars and I know this is considered impossible because of the synchronized gears, but lets suppose that you can manage to shift gears (For example you could shift into ...
2
votes
0answers
222 views

2003 Ford Focus 5 speed Stuck in Reverse [closed]

The shift lever is stuck in reverse and will not come out. I took out the shift tower to check the cable, and nothing appears to be missing or stuck. What could be causing this problem?
8
votes
1answer
150k views

Why am I not moving after starting car and shifting to Drive?

So I have had this issue for the last couple months where when I first start the car, shifting to Drive (automatic transmission) doesn't do anything. Pressing the gas only revs the engine, as if in ...
9
votes
1answer
666 views

Pontiac G5 transmission sometimes grinds when shifting into first while stopped, occasionally stalls car

I have a 2007 Pontiac G5 with a 5-speed manual (Getrag F23 if you're curious) and about 145k miles. This problem has been ongoing for a couple years now but is progressively getting worse. Sometimes ...
4
votes
2answers
886 views

Why after a certain RPM with the same gear selected the car no longer accelerates?

I have basic understanding of gearboxes and why we use them, but what is baffling me is that after about 4000 RPM (at least in my car) it doesn't accelerate further (or it does slowly)... This seems ...
6
votes
2answers
313 views

Manual transmission noise

What causes a grinding or scratching noise when shifting from 2nd to 3rd Gear on a 2000 Celica GT? I did have my mechanic add some gear oil but was thinking maybe I should have him drain out old ...
4
votes
1answer
4k views

Is intentional kick-down bad for the engine?

I have a car with automatic gear (Mitsubishi 1600cc, if it matters) and sometimes when I want to gain speed quickly (e.g. when passing a slower car in a two-way road) I do a kick-down. I know it ...
4
votes
2answers
2k views

My car locks lower gears when on high speed, why?

When I'm on say 50 Km/h my first gear is not accesible and second gear is too, 3rd gear however is hard to push in but 4th gear is easy to slip in, why?
7
votes
1answer
512 views

Any possibility of engine stall if engine brake is active during gear shift?

My understanding: Engine brake uses engine friction to damp the vehicle momentum. If one wishes to apply engine brake to assist manual gearshift,(activate engine brake, rpm dies, shift to lower gear),...
8
votes
1answer
817 views

How come gears don’t normally change in an automatic car?

I know that there is a similar question here, and another one here that asks when an automatic gearbox knows how to change gear, but I want to know exactly how it does that. It was brought to my ...
8
votes
2answers
28k views

What does it mean to have a stiff first gear?

This problem is a small one and it can only occur with manual cars, but I have been curious to find out more about it for a while now. Sometimes, when the car is attempting to pull away from a ...
6
votes
2answers
2k views

What is the best “automatic” gear to be in when going up a snowy incline?

My car is a Volvo S80, it's great in ground-level snow. I tried going up an incline in "D" and it wasn't having it, basically just slowed down and stopped dead in its tracks. I have never used the 3 ...
5
votes
1answer
146 views

Acceleration pickup of a car

When I say "Tata Winger can accelerate from 0 to 100 Kmph in nearly 19 to 20 seconds, which is quite good for this class" - how is it measured? Is this by accelerating the car from 0 to 100 kmph on a ...
1
vote
1answer
1k views

Changing gears at what speed? [closed]

Can someone please link me to a website where I can get the speed at which a car must shift gears, (manufacturer wise would be better). Or maybe, link to a website where I will be able to calculate ...
3
votes
1answer
2k views

What exactly is a gearbox?

You know that gear stick that we all use so much? Well, I know what it does in the sense that I know how to change gear and drive a car with a manual gearbox, but I don't know much more than that. ...
3
votes
2answers
1k views

Gear ratio from speed and rpm

https://stackoverflow.com/questions/30017271/obdii-determine-gear-given-speed-and-rpm Referring to the above link, one method to find the current gear ratio is to calculate Speed/rpm (The rpm is the ...
4
votes
1answer
153 views

Does putting vehicle in neutral at slope cause clutch plate spoilage?

I am having a Hero Honda Passion 2002 model motorcycle. I have a doubt regarding clutch and Neutral functionality. I have observed that most of the time in our city the roads have ups and down so ...
2
votes
1answer
245 views

I have a 2000 Suzuki Grand Vitara 5 Speed Ticking noise

I hear a ticking noise coming from the driver side rear end, possibly coming from the differential, not sure though because i checked out the pinion gear and i don't see any chips off any of the teeth,...
4
votes
1answer
6k views

Why are most motorcycles 5 speed than 6 speed?

I have a Honda Trigger motorcycle. I have seen most of the motorcycles even like Karizma ZMR having 5 gears. What would be the reason to have just 5 gears even for 223 cc motorcycles?
0
votes
1answer
214 views

How to get in fourth gear

I have 2007 automatic Scion tC that I just bought and I was wondering how do I put it in 4th gear or (sport)?
2
votes
1answer
42 views

99 Jetta transmission trouble

My wife's 99 Jetta is very hard to get into 1st gear. 2 out of 3 times you will hit 3rd gear. She often has to start off from 2nd gear. Is there a way to adjust the linkage or something to allow more ...
3
votes
3answers
404 views

How to remove this gear from this pump and motor?

Actual story is both driven & driver gear teeths are warped up. I am trying to remove this gear coupling from the motor side using gear pulling device by applying load, but it still not coming: ...
3
votes
1answer
2k views

Occasional Crunch/Grinding noise when shifting into first gear at speed

When I am doing about 30-20mph, and am about to stop at a junction, where I know I will have to stop, I shift my car into first gear However, sometimes when I do this, it makes a quick gear grinding ...
4
votes
1answer
500 views

After long journeys, gear slips in 5th, but not into neutral

This is a follow up to another question I asked. I've managed to get some video of it happening this time. It started happening after travelling for about 2 hours. I was experiencing heavy traffic. ...
3
votes
3answers
15k views

Should starter pinion be greased?

When replacing a starter (or reinstalling the old one), should the pinion that powers the flywheel (is that actually the flywheel?) be greased or not?
5
votes
3answers
72k views

Reverse Gear Doesn't Work Anymore on an Automatic

I've been having troubles with my automatic transmission for sometime now mainly it's lost it's smoothness and has been slipping first thing in the morning. I've practically worked on every other ...
3
votes
3answers
2k views

Safe engine braking in automatic cars

When I was learning to drive, I took my lessons in a manual car. On one of the lessons I was performing a reversing maneuver and I controlled the car on both the clutch and the brake pedal... which I ...
1
vote
2answers
2k views

Why my bike shows petrol missing before 2000 RPM in all gears?

I am using Hero Karizma R (225cc, 5 gears). Recently I feel a missing in all gear befor 2000 RPM. Sometimes my bike turn off due to this missing. Usually it happens at 1st/2nd gears. After 2000 RPM ...
4
votes
2answers
917 views

Synchromesh, Helical gear design

What specifically, is the design principle behind the Helical shape of gears in a synchromesh transmission? Are the Helical gear designed, in any known vehicle, to disengage? Is that why the gears ...
1
vote
1answer
1k views

What is the redline for different gears for Peugeot 107 2005 model?

I have a Peugeot 107 which is a 1 liter engine car. I was wondering what is the maximum safe speed at different gears? The car starts to make a lot of noise in 1st and 2nd gear, even at 10 mph at ...
2
votes
2answers
2k views

My motorbike handle gets a hit when I hit a bump or pothole

My 2 month old bike is a 200CC Bajaj Pulsar (made in india) with only 2000kms on the odometer. I have ridden it carefully. I touched 100km/h accidentally on a drag race with my friend, just one time, ...
2
votes
3answers
12k views

Ford Transit not going into 1st gear easily

With a lot of Googling I've found loads of different things that could be causing this - and none for a Ford Transit so I hope someone can explain exactly what is causing this problem, and from the ...
4
votes
2answers
1k views

Replacing 3rd gear synchro on a Tacoma

I have a 4WD 2007 Tacoma V6 manual with 6 speeds. This model has a notorious reoccurring problem with its 3rd gear, which is due to the synchro going bad on that gear, as per many online testimonials....
0
votes
1answer
934 views

How to fix 2007 Dodge Ram Hemi Overdrive Problem

When my friend is going at least 70 MPH the overdrive doesn't work. And sometimes the overdrive doesn't work when he's going 40 MPH! What could I do to fix the problem. And I would like to avoid ...
16
votes
8answers
6k views

Is shifting to neutral on a decline more fuel efficient than keeping the gear engaged?

I always had the habit of shifting to neutral on long declines and using the brakes to slow down as needed. Intuition made me believe I'd be saving fuel as opposed to keeping a gear engaged. However, ...