Hi David
You only need a box if you are going to rebuild other peoples gearboxes or a
lot for your self!
Not really a yearly maintenance procedure, I have done several different
boxes, something I forgot to mention, check the groove in the shaft, the
edges of the groove should be square, if the edges are radiused you will
need a new shaft!
I have all the bits ready before starting, and working at a steady pace, not
rushing, and without rebuilding an overdrive I recon to rebuild a gearbox in
a day, excluding removal and re-fitting. I guess if you were in a real hurry
and had done it a couple of times before you could shave a couple of hours
off, but I tend to be a bit if a perfectionist, I reduce the thing to
components and then wash them thoroughly usually using paint thinners as
this does not require a water rinse.
To do the clip, you will need to remove the bell housing and rear extension,
pull out the laygear pin and allow the laygear cluster to drop into the
bottom of the box, then you can pull out the input shaft and then the
mainshaft, then you might as well lift the laygear cluster out and then fit
all new bearings.
Be very wary about changing the synchro cones, if the gear change is smooth
and you do not have crunchy gears there is really no reason to change them,
conversely if you do have crunchy gears then you will have to be sure of the
source, there have been messages about how to identify a good synchro from a
bad one so I won't try to cover that! What I would suggest is get some new
springs for the detent balls in the synchro hubs.
To get the circlip off of the front of the mainshaft without the correct
tool is a bit slow, you need three or four hands without the extra body in
the way! (Man was definitely not designed by an engineer!) I usually use a
couple of small bladed screw drivers to lift the clip out of the groove and
then gently try to pull the clip forwards before it falls back in the
groove, once it is far enough forward you can get modified screwdriver down
behind it and prevent it from falling back into the groove, once you reach
this point you are winning!
On reassembly, the only real tip I can give you is to pass a couple of old
shoe laces under the laygear cluster to help you to control the thing during
re-fitting the laygear pin, also stick the bronze thrust washers to the end
of the gear cluster with grease, these are about the most fiddly things to
get in place, they tend to want to move out of line at the slightest
provocation!
Hope this helps for starters!
----- Original Message -----
From: "David Templeton"
Subject: RE: GT6 Gearbox
Thanks for the info Graham, from this info I get the following points:
1/ Don't buy one clip buy a box.
2/ This is a yearly maintenance procedure, once done a couple of times
it will become a snap and I can do it in my sleep :-P
3/ Treat the clips with minimal stress and realize any diversion from
install, get a new one.
I know I can have the gearbox out in about 45minutes to 1hour, how long
and do you have a successful procedure that minimizes the work :-) Yes,
learning from the experienced is always the best
David Templeton
'59 Triumph TR3a
'74 Triumph Spitfire
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.813 / Virus Database: 553 - Release Date: 13/12/2004
|