I had a problem like this, especially with the heat aspect.
I feared gearbox and OD problems.
As I drove the car and it warmed up the grinding was horrid.
It turned out to be the ball at the base of the stick shift.
A lack of grease left metal on metal.
I added grease.
dgb
>Date: Wed, 20 Jan 1999 08:32:10 +1030
>From: Paul Heuer <paul.heuer(at)dsto.defence.gov.au>
>X-Mailer: Mozilla 4.5 [en] (X11; I; SunOS 5.6 sun4u)
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>To: "alpines(at)autox.team.net" <alpines(at)autox.team.net>
>Subject: Clutch woes?
>Sender: owner-alpines(at)autox.team.net
>Reply-To: Paul Heuer <paul.heuer(at)dsto.defence.gov.au>
>
>Hi all,
>
>Has anyone experienced this before:
>When cold my clutch/gearbox works fine. As the car warms up it gets
>harder to select gears until after 20 mins of driving it is nearly
>impossible to change gears without a crunch. I suspect my clutch
>hydraulics need rebuilding, but I don't understand the cold/hot thing.
>
>The car was off the road for about six months while I removed the
>gearbox and put in a new clutch plate, pressure plate, throwout bearing,
>etc. The hydraulics worked well before this, but the system was left
>disconnected for the time the car was off the road.
>
>The car is a Series 3 with stock gearbox and overdrive. I did put in a
>roller throwout bearing, which appears to be working well. The gearbox
>runs 30wt engine oil.
>
>Cheers,
>Paul.
>--
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