Alan:
You're correct - partly. The diaphragm clutch was introduced during the BJ7
production - fairly late, in May '63, with the first BJ8 in Oct. '63.
Flywheel part #, dowel part # changed as well, and dowel quantity went from 2
- 3 at the change point, as did the clutch cover mounting bolt part #. I'm
pretty sure that the mounting bolt circle changed as well from the 10 inch to
9 inch clutch (even though the disc varied between 9 and 91/2 inches.)
All of which still makes the changeover that Mark was asking about easier when
a late flywheel is in hand, rather than reworking the earlier one to take the
later clutch.
Cheers, ------ Earl
Earl -
I think the bolt pattern on BJ7 and some other later BT7s will be the same
as the BJ8 but the peg pattern may be different.
Alan
'52 A90
'53 BN1
'64 BJ8
On Tue, Mar 17, 2009 at 10:41 AM, Earl Kagna <kags@shaw.ca> wrote:
Mark:
It's a worthwhile upgrade (IMHO) - the BJ8's diaghprgam clutch is
superior.
The differences between the earlier flywheel and the BJ8 - there are 3
dowel
holes rather than 2, and they are in a different cicle. Also, the 6
clutch
cover mount holes are in a different cicle, and are a different bolt
size.
Understandably, it would be easier to use a BJ8 flywheel, but if one is
not
available, the earlier one can be modified to take the later clutch by a
competent machine shop. Either way, this conversion can be done with
either
the original gearbox / overdrive, or the Toyota 5 speed conversion.
Bill Bolton may well be able to help you - he may have lightened BJ8
flywheels available. If you need his contact info, let me know.
Try it, you'll like it!
Earl Kagna
Victoria, B.C.
BT7 tri-carb (Bolton Lightened BJ8 flywheel, BJ8 clutch)
BJ8 (Bolton Lightened flywheel, Toyota 5-speed [Smitty] - if I ever get
it
back on the road!)
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