Vance,
I don't have my notes in front of me, but the clutch friction material
measured well within the acceptable range. Unfortunately, I know how
easy it is to measure incorrectly. When replacing the seals and o-rings
everything looked in good condition. It seemed like it may not have
seen much use since the last time it was rebuilt. Thanks for bringing
up about reverse. You made me think about the friction material
providing the direct drive. You know as you go through the process of
learning all this stuff, it makes sense at the moment you're reading and
studying it, but the knowledge has a tendency of evaporating the minute
you move on to the next step. Maybe this is age related?
Mike
-----Original Message-----
From: Navarrette, Vance [mailto:vance.navarrette@intel.com]
Sent: Wednesday, January 07, 2009 2:25 PM
To: Corbitt, Michael; 6pack@autox.team.net
Subject: RE: J-Type OD - Engaged Pressure
Mike:
More likely your gauge is reading low from the sounds of it.
Have you cross checked your gauge with a known accurate one to verify
the readings?
Also, tap the gauge lightly when taking a reading, to insure
that residual friction is not holding the needle back. 20 PSI on your
gauge is only 2 minor divisions and conventional pressure gauges can
easily stick by that amount especially in the lower part of its range.
Even if everything is correct, and you are slightly low on
pressure, it sounds pretty healthy to me.
BTW, did you happen to check your sliding clutch member for
wear? My OD worked fine when it was cold, but slipped in reverse when
hot. Turns out that is symptomatic of a worn clutch. I measured the
remaining friction material, and it was at 0.040". As new is 0.100"
thick. It would seem that the OD needs a new clutch if you are at 0.040"
or less. I would check BEFORE you put it back in the car (unlike me).
Doh!
Vance
Vance Navarrette
Cogito Ergo Zoom
I think, therefore I go fast
-----Original Message-----
From: 6pack-bounces@autox.team.net [mailto:6pack-bounces@autox.team.net]
On Behalf Of Corbitt, Michael
Sent: Wednesday, January 07, 2009 2:09 PM
To: 6pack@autox.team.net
Subject: [6pack] J-Type OD - Engaged Pressure
<snip>
Nelson's article indicates I should have about 20 psi of residual
pressure in direct drive and 430-460 psi with the OD engaged. The gauge
I'm using registers from 0 - 600 psi in 10 psi increments. The gauge
registers very little, if any, residual pressure. With the OD engaged,
the needle bounces between 380 to 410 psi. I could definitely tell a
change in the speed of the input shaft when I engaged the OD, so I have
to believe it is working. Also, according to Nelson, there must be some
residual pressure; otherwise the dashpot would not work. Is the
engaged pressure acceptable? Is this lower than expected pressure
(380-410) and the movement of the needle indicating a problem, such as
with the pressure relief valve?
Any input would be appreciated.
Mike
Corvallis, OR
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