This is a repost of an old message originally sent to the healey list. But
it is obviously still usefull.
After looking at all my parts and doing some calculations I have decided
that the slave cylinder needed is around 13/16. The problem comes from the
fact that Datsun uses a 5/8 master cylinder and the Sprite uses a 3/4.
This will result in a clutch rod movement of 1.1 inches instead of the .75
that it needs. My guess is that the first resistance you feel is when the
clutch rod has mooved about 3/4 inch. After that you may just be forcing
fluid past the seal in the master cylinder if it is worn or you may be
pushing the clutch pressure plate beyond what it should. This also
explains the touchy clutch action as it is coming out real fast when you
let the clutch out ( about 80% too fast ).
Another option may be to convert to a 5/8 clutch master cylinder which in
your case is tricky as the clutch and brake master cylinders are in the
same housing.
At 09:54 PM 7/15/97 -0400, Frank Clarici wrote:
>JPierce wrote:
>>
>> Hi all,
>>
>> I have a '62 SPRITE MKII that I am getting ready to sell. The PO did a
>> '74 Datsun B210 engine w/Transmission conversion. The rear end is still
>> AH. When I bought the car, during the test drive, I was told the clutch
>> grab point was very touchy, sensitive, ummm..tight. It was and still
>> is. When I depress the pedal it gives you the feel that it is depressed
>> all the way, BUT, keep pushing and it goes to the floor. I have gotten
>> used to this over the past 10 years, but it will totally scare anyone
>> from buying it. The return on the pedal is very quick, I have only
>> about an inch of play before the gears engage. Not being familiar with
>> this, a person could "pop" the clutch constantly and shear off some rear
>> axle shafts. (something I did in the first two weeks of owning it.) I
>> NEED SOME HELP. What additional information could I send out to you
>> guys to better help me? I want to remedy this SOON. PLEASE HELP ME.
>>
>> Thanks
>>
>> Jeff
>> '62 Sprite MKII
>> '59 BN4
>
>Jeff
>
>I have heard of this problem with the Datsun 5 speed conversion.
>It occurs because the slave cylinder is miss matched with the master
>cyl. (Datsun slave, Lockheed master) I also have heard that a Big Healey
>slave with some minor modifications to fit the trans will cure the
>problem. The Sprite slave will not fit the Datsun trans.
>This is just what I have heard from 2 people with the same 5 speed, the
>clutch acts like an on/off switch.
>
>I have not personally fitted the Datsun tranny, but of the 2 I know of
>both had "snappy" clutchs, 1 went to the Big Healey slave and all is
>well. Basically he elongated the mounting holes so the slave would fit.
>
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