Why Reverse Gear is Not Synchronized in Swift?

[jayadev]

Yes the krrrr sound is mostly like it. As soon as I engage reverse the gear knob stays there and as the clutch is released this noise comes and gear stick vibrates (this happens with wagon R)

Hey Jayadev how do you know technical stuff on cars, do you read books on them?

Books ??

Well. friends,Gurus,Internet above all self interest/Curiosity and proffesionally I am into technical field.

I had inquired about this reverse gear noise long back when I was in college. as this noise is really amusing in Buses .
Big trucks and buses usually do not have synchro type gears for reverse as well as for 1st gear they sounds to me like cat meowing.

 

[Rightnow]

Books ??

Well. friends,Gurus,Internet above all self interest/Curiosity and proffesionally I am into technical field.

I had inquired about this reverse gear noise long back when I was in college. as this noise is really amusing in Buses .
Big trucks and buses usually do not have synchro type gears for reverse as well as for 1st gear they sounds to me like cat meowing.

I thought your precise technical words were coming from a few books. Internet does not provide such specific information as I have noticed.

The gear box (the box on which gear stick is mounted) of buses can keep a couple of cats inside it easily. May be it was actually a cat

Anyways the thread starter should explain his problem now.

 

[dharmesh]

Hello, Thread starter?? People are moving ahead with assumptions, could you please take some time and try to clarify what is the exact problem?

 

[Indian]

I think the OP is taking about the terminology called 'Synchromesh'. In manual gear box engagement type may be synchronized or un-synchronized. Generally old systems used to be un-synchronized where you see the double de-clutching was required to engage the gears. Basically you are bringing the drive gear and the driven gear to same speed by the first de-clutch and a quick acceleration and then second de-clutch and engage. But later synchromesh gear boxes employed to eliminate the issue. Here there is a additional ring called 'dog collar', which is slid across the gear for engagement. To bring the speed of two gears to be 'syncronized'(same speed) a friction between the collar and the drive gear is utilized. I do not know if there is any such arrangement for synchronization for 'reverse gear' as there is nothing to be synchronized, since we are supposed to shift at stand still.

Important to note here 'we should always wait before we engage next gear in synchromesh gear boxes to allow the speed of both gears to come to same before we push it in to slot. So a pause on neutral before going in to next gear is required. If we rush you might hear a grinding of teeth before engagement.

 

[dharmesh]

But grinding of teeth also occurs if you not pressed clutch entirely. Isn't it?

 

[Indian]

But grinding of teeth also occurs if you not pressed clutch entirely. Isn't it?

Definitely something is wrong with his reverse gear mechanism.

I do have a swift and I do not have any issue reversing in the cold morning. Only thing happens to me is sometimes it does not engage to reverse easily during cold start, then release the clutch and again apply and change to reverse it works.

 

[allhyundaicars]

What I understand is while slotting to R gear
the thread starter hears the sound of gears grinding say "krrrrrrrrrrrrr" (due to lack of synchronization)
Or whining noise while moving reverse. (due to straight cut gear theeth unlike helical in forward gears)

this happens in my i10 as well. do you mind sharing more on this and also sometimes i'm unable to shift into reverse even after several attempts. then i have to engage to first 4-5 times then only i'm able to engage in reverse. this is when engine is off.

 

[jayadev]

this happens in my i10 as well. do you mind sharing more on this and also sometimes i'm unable to shift into reverse even after several attempts. then i have to engage to first 4-5 times then only i'm able to engage in reverse. this is when engine is off.

Actually there is a gate to prevent accidental shifting to reverse .Do not force but slot it in 1st then reverse it should work.

 

[allhyundaicars]

Actually there is a gate to prevent accidental shifting to reverse .Do not force but slot it in 1st then reverse it should work.

ok thanks. yes i do the same. i haven't changed the transmission oil ever. won't go much off topic after this but should we change that as well ? and at what intervals ?

 

[Releesh]

Transmission oil for Maruti petrol cars should be changed in 20K KM interval as per service book.

 

[Mr.Ash]

Hi Jay, when he means "synchronization issue " it actually means why he can't engage the reverse straight away and what i understand from your reply it means (where you shift reverse on the go)

yes i got your point, but what if i start the car which is parked overnight facing a very close wall

The next day morning when i take the car out i engage the reverse directly and it doesn't engage that is what he means here "synchronization issue " and not on the go]

But whatever be the case when ever i start the car i engage the first and move a milli and then engage reverse as a strange belief so i never faced this problem

I totally agree with you. I also face the similar problem in my new SWIFT. Tried doing this today morning and i'm not able to engage the reverse gear directly (again this is possible after trying out 3 or 4 times). Instead of trying out 4 times, might as well i start the car engage the 1st gear and move the car a bit and then engage the reverse (Now it works perfectly fine ). This happens only when the car is cold (start the next day after the whole night parked).

Initially I thought the reason could be the car being new Now that somebody raised a similar issue will address it in my first service on Saturday.

Cheers,
- Ash...

 

[rakesh2013]

Why reverse gear is not scronised in maruti swift?
is it for money saving or any other specific reason??

Whenever i cold start my car and engage reverse gear there is rattling sound from my gear box what is the culprit behind it?

The sound which you are getting during reverse gear is absolutely normal-and it will never be the same with forward gears.
Forward gears are helical gears while the reverse gears are cut into spurs-this results in whining noise.
The reason is to from safety point of view-it prevents accidentally shifting into reverse while moving. The bottom line is one can not put reverse gear while moving forward.
Enjoy driving.