Transmission noises 101
Makes a noise when your foot is on the clutch, but not otherwise: Throwout
bearing or pilot bearing/bush. Apply light pressure to clutch pedal with
the engine running. If the sound remains, it is the T/O. If the sound only
shows up with the clutch pedal near the floor (fully disengaged) think pilot
bearing / bush.
Makes a noise in neutral with your foot off of the clutch: Possibly the T/O
bearing, or first motion shaft bearing, or lay shaft bearings.
To eliminate the T/O bearing get under the car while running and pull the
clutch arm back away from the engine. If the noise remains it is not the
T/O. See below for further fault tracing
Makes a noise in neutral, 1st, 2nd, and 3rd, but quiet in 4th: Lay shaft
bearings.
Makes a noise in neutral and all gears: First motion shaft bearing
Makes a noise only while moving: Output shaft bearing, OD bearings, u-joint
rear axle.
Hope this helps
Rick
On Jan 11, 2008 11:15 AM, <mark.jones@exxonmobil.com> wrote:
> It could also be the pilot (spigot) bushing that is making the noise and
> if
> so it is nothing to worry about.
>
> Mark
> 73 MGBGT
>
> ----- 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.
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