Crunching Gears

[Arnold]

Hello!

When putting my car in reverse, 7 out of 10 ten times it will really crunch. On occasion, it slips in fine but mostly it'l really sound crap and looks like i dont know how to gear change!

The 5 normal gears are fine. Anyone got any ideas why this might be happening? The box was recon back in January and the clutch was looking fine then.

Cheers
Arnold

 

[RIK]

could be a worn selector busher??

 

[Turtle]

Mine does this crunchy thing too, different noise though doesnt sound like the gears themselfs... synchomesh??

This is someone who knows nothing about gearboxes... what does the synchromesh do?

 

[Allan]

Always put your car into 1st before trying reverse, lines up the gears.

 

[Turtle]

Always put your car into 1st before trying reverse, lines up the gears.

Hmm. from what I remember its worse after coming from 1st. Cant be sure tho.

 

[AMY]

Your clutch might me dragging slightly.

 

[Speedle]

its prob the clucth cable needs andjustiing mate from when we adjusted it last time

 

[Mat.T]

Always put your car into 1st before trying reverse, lines up the gears.

good tip, mine crunches going into reverse if i don't put it in 1st first

 

[paul_k10_Lx]

does it have something to do with reverse beeing straight cut and the others helical cut?
mine does it too

 

[Ed]

AMY has said the most likely thing to be the problem here...

 

[SammoHung]

AMY has said the most likely thing to be the problem here...

...where?...lol


Mine cruunch a bit on a morning...nothing so bad that they won't mesh though.

ALAN: top tip! I will be tryin this one out nex time i reverse on a morning....

 

[rlees85]

every car ive ever driven does it.

 

[Arnold]

Your clutch might me dragging slightly.

So whats the cure for that?

I'l try that first gear thing as a temporary measure! Still makes a slight grind even if i've driven forwards first, but its not as bad. When going into reverse from scratch, it either grinds in slowley like someone's having an electric drill put through there teeth, or it'l make one quick loud grind - either way, both sound very unhealthy and embarrasing! along with the random suspension noises i have etc.

New car? lol

 

[RIK]

So whats the cure for that?

New car? lol

k12

 

[micra man]

My old gear box used to do that too. Was quite annoying!!! :S

 

[rlees85]

mine hasnt done it sinse i done the gear oil, you tried sticking some part synthetic in there?

 

[Arnold]

It could do with an oil change so might get the gearbox oil done at the same time

 

[Turtle]

It could do with an oil change so might get the gearbox oil done at the same time

How often is this supposed to be done?

 

[AMY]

Paul: The driving gears are synchromeshed, reverse is not. As far as i'm aware anyway. Gears are usually helical cut to reduce the noise generated from the gears.

Arnold: Assuming that the clutch friction plate isn't sticking to the input shaft, try turning the adjuster on the gearbox end to take some of the slack out of the cable. There should be a certain amount of free play in the cable, check the tolerances in your haynes manual. Too much will mean that most of the pedal travel will be expended taking up the slack, and not disengaging the clutch.

 

[paul_k10_Lx]

Paul: The driving gears are synchromeshed, reverse is not. As far as i'm aware anyway. Gears are usually helical cut to reduce the noise generated from the gears.

Arnold: Assuming that the clutch friction plate isn't sticking to the input shaft, try turning the adjuster on the gearbox end to take some of the slack out of the cable. There should be a certain amount of free play in the cable, check the tolerances in your haynes manual. Too much will mean that most of the pedal travel will be expended taking up the slack, and not disengaging the clutch.

i thought all reverse gears were straight cut hence the whining noise where ur in reverse. i didnt know if beacuse of this arangement it wears more than the other gears

 

[Ed]

K10 reverse is straight cut and has no synco mesh. Hence if you change gear into reverse slowly or the clutch drags it will crunch. two options change gear quicker (lol) or sort out the biting point if its too high already.