[Mgs] Overdrive Noise/Shifting Problem

[Paul Hunt]

A throw-out bearing is more likely to be noisy when you push on the clutch 
pedal, especially if the noise is still there if you pull back on the clutch 
release arm to push the slave piston further into its bore (watch the clutch 
master doesn't overflow).  Unfortunately you can't eliminate something just 
because it is relatively new, replacement parts are very unlikely to be as 
good as the originals, sadly.  'Scraps' reverse or 'scrapes' - there is a 
difference?  There is only a spring-loaded detent limiting entry across the 
horizontal neutral position into the reverse up/down position, it is quite 
easily defeated if you change down with gusto, but then you have to back out 
of that part of neutral to the 1/2 vertical position before you can select 
2nd.  If you are saying reverse grinds as you are selecting 2nd, that sounds 
more like major problems inside the gearbox/selectors.  But how do you know 
it is reverse that is scraping, and not simply 2nd grinding because of 
defective synchro?

PaulH.

----- Original Message ----- 
>I have an overdrive transmission on my 1980 MGB and when it is in neutral 
>and
> the engine is running it produces a "roaring" noise.  The noise appears to 
> be
> coming from the front bearing on the transmission shaft. I do not believe 
> it
> is coming from the throw out bearing because I installed a new throw out
> bearing and clutch approximately 2,400 miles ago when I did a complete
> restoration(towed the car home because it had not run for 14 years).  In
> addition, when I down shift from 3rd to 2nd and if you do not shift just 
> right
> it scraps reverse gear.