Robert,
I can use the pressure plate, but the disc spline must match the Toyota
transmission's input shaft. My current disc could be used to make a new
one with the spline changed to the correct size and number of teeth, but
that may cost just as much as a new disc.
To explain the whole thing, my BT7 disc has a 10" OD and 6 3/4" ID on
the friction material. The supplied disc has 9 1/8" OD, 6 1/8" ID. So
using my pressure plate the effective friction size will be 9 1/8" OD, 6
3/4" ID which if you figure the friction areas is only 69% of the
original. It just doesn't sound like sound engineering practice to me.
Charlie
Robert Blair wrote:
>Charlie,
>
>Sounds like one of those typical after market answers - 'never seen a
>problem with it'. The pressure plate to disc mis-match seems to large
>to ignor in my book. It is not clear to me why you cannot continue to
>use your BT7 press plate and disc? Why do you have to toss your
>current disc? Is it the spline size?
>
>Robert.
>
>--- Charlie Baldwin <mgcharlie@comcast.net> wrote:
>
>
>
>>Recently I purchased the 5 speed conversion kit from Pete Delaney who
>>
>>bought out Smitty.
>>He supplies a clutch disc that is sized for a BJ8 diaphram clutch
>>which
>>is smaller than my BT7 clutch. So much smaller that I will have 69%
>>of
>>the original clutch's friction surface on each side of the disc. I
>>have
>>discussed it with him and he says that no one has had a problem with
>>that and he recommends using a BJ8 pressure plate and flywheel. I am
>>
>>not willing to cast aside a flywheel that I spent money to have
>>resurfaced and lightened and a pressure plate installed less than
>>1,000
>>miles ago. Already I won't be using the current clutch disc and
>>throwout bearing with that same mileage (besides all of the cost of
>>the
>>Toyota transmission, 5 speed kit, etc.).
>>Some of you have mentioned previously about getting a custom disc
>>made,
>>which seems to be a good approach to me.
>>Does anyone have a name and contact info for people who do this sort
>>of
>>thing on a one off basis and don't charge an arm and a leg?
>>Thanks.
>>Charlie Baldwin
>>'62 BT7
>>York, PA
>>
>>
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