Toyhead Auto
Restoration Services
Specializing
in
Parts,
Products
and
Accessories
for
Toyotas.
Tips on Rebuilding
Toyota Celica 6.7 inch
Rear Differentials 1971 to 1985 With Solid Rear Axles
I
can give you my experience from doing 6.7 rears from 71-77 Celicas. If
the ring gear is good used. I measure the lash before taking it apart
and
set it up with the same lash when I put it back together. The lash is
adjusted by the outer threaded collars with the holes in them that hold
the carrier (ring gear) bearings.
If the ring gear is new you have to set it up and check it using
marking compound to make sure the pinion gear is hitting In the center
(middle) face
of the ring gear teeth. If the pinion gear does not hit correct it may
have to be adjusted with a shim (washer) thinner or thicker under the
pinion gear base (neck).
There is a crush washer (collapsible sleeve/ spacer) used on this rear
on the pinion shaft that helps set the pre-load.
The pinion nut must be torqued initially ( to 80 lb.) to set up the pre
load. Pre-load should be to about 9 to 13 lb. with new bearings and 5
to 8 lb.
for used bearings. Pre-load is measured by wrapping a string (attached
to a fish scale) around the pinion flange and pulling it to spin as you
note
the pound reading on the scale. If less you have to torque it a little
more and check it. If too much pre-load you have to take it part and
use a new
crush washer and start over again.
Maximum tightening torque for the pinion nut is 173 lb.
Ring gear bolt locking plates and the pinion nut must be peened (bent)
over to prevent movement and hold settings.
By Rick Dormoi