gearchange

[nick viner]

My gear box is snicking teeth moving from 1st. to 2 nd gear.
Have changed gear oil and added nulon. No change .Car done 87.000 kms 2002 NB LE
Changes OK if done slowly. Anyone any ideas?

[Matty]

shagged synchros most likely.

Try Redline oil (everyone raves about it)

I'm running 1/2 Castrol synthetic g'box oil, 1/2 Castrol Dex-3 ATF to try to fix the same problem. Seems to work OK but I haven't tried much else...

Could also be the hydraulics (slave or master cylinder) failing, but that would affect all gears.

[Keith]

lol still worth checking the clutch hydraulics first. Although I agree it usually affects all gears, sometimes- it doesnt. I recently had a problem selecting 1st and second in the wife's car. Turned out to be clutch slave in the earliest stage of going awol. no visible leaks, no noticeable reservoir loss, but a slight weep ( all the leaked fluid- maybe 1/2 teaspoon full) was contained in the slave boot. Was just enough to reduce the actuating rod travel to make the low gears hard to select without grating. ( these spin faster than the higher gears, I presume).New slave fixed problem. Hope yours is as easy. I only investigated the slave in desperation after deciding the synchro was shot and the gearbox had to come out.

[Insurgence]

Hi all,

I get a similar thing on my NB8A:

when it's cold in the morning, sometimes the teeth will grate when 1->2 even when i have the clutch 100% depressed.

seems to work find when warmed up.

apparently the slave was replaced 2 years ago... how often do these things go bad?

[nick viner]

Thanks guys . Yes it is worse when cold and it doesn't happen every time.

[Mr Morlock]

Nick and Insurgence- the old cold snick is normal and perfection betwixt 1 and 2 at any time is not always achievable. It is a matter of degree. There are a number of threads about Redline though it is certainly not mandatory to use this oil- if the irritation is too great it might help. Keith's advice describes what is a common problem and worth keeping an eye on.

[nick viner]

Thanks Mr Mortlock, Note taken

[nick viner]

Seems to be nearly normal today. That's odd

[nick viner]

Yes DaleZ ,I agree mine, has started to behave it's self. Work that out . temp may be a contributor

[Garry]

Or you could check this if it's an NB8B+

http://mx5cartalk.com/phpBB-3.0.2/viewtopic.php?f=29&t=32467

It made a big difference to the gear change quality in my car.