[TR] A type overdrive shim and spring binding

[Dave Massey]

This is for the A-type.  The spring serves two purposes.  The first is to
store energy to engage the overdrive when the solenoid is energized.  The
other is to set the pressure relief valve pressure.  As the pump pumps oil
into the reservoir the piston moves out compressing the spring.  When the
spring compresses enough the piston moves far enough to expose ports that will
dump excess oil back into the sump.  Using a stiffer spring means more
pressure is required to expose the ports and system pressure will be higher.
Fitting shims (washers) behind the spring will do the same thing.


Dave Massey






-----Original Message-----
From: fogbro1 <fogbro1 at comcast.net>


List,



While we're on the subject, TRF lists a "washer, spring packing, to increase
pressure", Triumph part no. 513900, in their blue TR6 catalog. It measures
.130"
thickness.



The same catalog list two pressure springs, one for early TR6, the other for
gearboxes after CD15651. Any idea what that was about?



Ed Woods