[Roadsters] Clutch Question

[Daniel Solomon]

I haven't been following this thread closely, but DOT 4 and DOT 5 is 
something I 'do' know something about, so I'll chime in. 
If you mix DOT4 and DOT5, you get mush.  Mush which expands, and 
swells.  And destroys seals. 
There "is" a DOT 5.3 that can be mixed with the 3 and 4, but not with 
the 5.  I know... very confusing.
I used DOT 5 regularly in my race-bikes.  (higher boiling point was 
available in the DOT5)  Once it was intermixed with DOT4 (by accident) 
at the racetrack.  I spent the next several hours dissassembling the 
entire system and cleaning every seal and flushing every hose and 
orifice with rubbing alcohol (which will make seals dry and shrink).  
Worked well enough for a "racetrack repair", and then I replaced them 
all before the next weekend. 

Dan

dave wrote:
> Jim, Where in New Jersey?? I'm in Kenilworth, North Jersey.  DOT 4 is
> correct if it had DOT 3 or 4 in it.  I don't know what happens if it had
> DOT5 and DOT 4 is added. If oil got into it, then what you are describing is
> exactly what happens, all the seals swell to almost double size.
>
>  Easy test, if you can push the pedal with the bleeder screw loosened and
> fluid comes out, master is working and easy guess is the slave is likley
> siezed. Doubt the clutch itself is hung up.  I found a source for
> inexpensive slave cylinders if you need, if it's the master I probably have
> a spare.
>
> My cell is 908-591-9892, give a call if I can be of any help
>
> Dave Brisco
> ECR
>
> -Original Message-----
> From: Jim Gammon [mailto:gtpjimgammon at yahoo.com]
> Sent: Monday, February 18, 2008 12:12 PM
> To: Datsun roadster
> Subject: [Roadsters] Clutch Question
>
>
> I just got my 2000 1969 back together after a complete engine and trans
> rebuild. 2 years, a bit of procrastinating and weather.
>
>   Today is is warm here in NJ, so I decided to do some final stuff. I
> started her up, balanced the carbs, setthe timing and then went to bleed the
> clutch.
>
>   The pedal would not move, and won't unless I push VERY hard. It moved fine
> 3 weeks ago, and since it was low, I added fluid. DOT4.
>
>   Did I use the wrong fluid?
>
>   Do I need to rebuild the cylinder? I didn'ttouch the master of slave in
> this rebuild.
>
>   Thanks in advance.
>
>   Jim Gammon
>   New Jersey
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