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From: Hachiroku ハチロク on 15 Sep 2009 17:13
On Tue, 15 Sep 2009 14:18:11 -0500, Ray O wrote:

>>
>> I thinkk the first problem is probably motor/tranny mounts, and the
>> second...er, bushings...I hope....
>
> This is a pretty classic case of the ridges on the synchro rings being
> worn, usually from working them too hard when downshifting from high RPM.
> The correct fix is replacement cones and rings, which requires
> disassembling the transmission. While the case is open, it makes sense to
> replace shft seals at the same time and checking the clutch and flywheel.
> IIRC, that vintage transmission used gear oil, but if you're willing to
> experiment, you can try ATF to see if the shifting gets easier.
>
>
>> I haven't bought the car yet. It's in Good to VG condition. Needs some
>> suspension work and maybe a clutch.
>>
>> I'm betting, if I do buy it, it will be an FX16 by the end of next
>> summer... ;)
>>
>>
>>
> Fortunately, a manual transmission is a lot easier to work on than an
> automatic!

Hmmmm....transmissions are a mystery to me.

I wonder what model it is, but the unfortunate thing is my Corolla GTS is
an FR layout, and the FX is a FF layout...

Unless the driveshaft and rear axle fit...



From: Ray O on 15 Sep 2009 17:36

"Hachiroku ????" <Trueno(a)e86.GTS> wrote in message
news:pan.2009.09.15.21.13.19.753232(a)e86.GTS...
> On Tue, 15 Sep 2009 14:18:11 -0500, Ray O wrote:
>
>>>
>>> I thinkk the first problem is probably motor/tranny mounts, and the
>>> second...er, bushings...I hope....
>>
>> This is a pretty classic case of the ridges on the synchro rings being
>> worn, usually from working them too hard when downshifting from high RPM.
>> The correct fix is replacement cones and rings, which requires
>> disassembling the transmission. While the case is open, it makes sense
>> to
>> replace shft seals at the same time and checking the clutch and flywheel.
>> IIRC, that vintage transmission used gear oil, but if you're willing to
>> experiment, you can try ATF to see if the shifting gets easier.
>>
>>
>>> I haven't bought the car yet. It's in Good to VG condition. Needs some
>>> suspension work and maybe a clutch.
>>>
>>> I'm betting, if I do buy it, it will be an FX16 by the end of next
>>> summer... ;)
>>>
>>>
>>>
>> Fortunately, a manual transmission is a lot easier to work on than an
>> automatic!
>
> Hmmmm....transmissions are a mystery to me.
>
> I wonder what model it is, but the unfortunate thing is my Corolla GTS is
> an FR layout, and the FX is a FF layout...
>
> Unless the driveshaft and rear axle fit...
>
The driving and driven gears in a modern manual transmission are always
meshed and turning, and so these transmissions used to be referred to as
"constant mesh" transmissions. The term "shifting gears" is kind of a
misnomer because the gears themselves don't actually shift. Connected to
the actual gear is a brass cone that looks like a canning funnel with teeth
on the outside. There is a brass synchronizer ring that fits over the cone,
and on the inside of the ring are a series of fine ridges, kind of like a
coarse file. When you shift gears, the fork pushes the ring against the
cone and the fine ridges apply friction to the cone so that they eventually
end up spinning at the same speed, a process known as synchronizing. When
the ridges on the synchro ring get worn, they don't grab the cone so the
teeth on the syncro ring make a chattering or grinding noise when they
engage the teeth on the cone.

The reason I suggested ATF is that the lower viscosity means that there is
less lubrication between the cone and rings, so they may grab more easily
and there is less drag so the cone will spin up more easily.

IIRC, the regular FX has an 8 valve engine, while the FX 16 had the same 16
valve engine that the Corolla GTS had so while the engine are the same, the
transmissions are not.
--

Ray O
(correct punctuation to reply)


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