Actually, the spec pressure is 350 for a large accumulator type (pre
TR4A) and 450 for the later ones with a small accumulator. Racers
prefer the large accumulator and often go to higher pressure for a
quicker and more positive shift. Anyone that works on these should have
a pressure gauge. Our article in the maintenance section at vtr.org
gives guidelines for the effect of shim thickness on pressure and
information on where to buy a pressure gauge.
Larry Young
On 7/28/2013 2:33 PM, Steve Yott wrote:
> The A-Type non return valve operates as a check valve for the oil pump. If
> the valve is leaking or not closing etc. you will not be able to develop
> full operating pressure which should be in 450 to 550 lbs. area. It really
> would not provide any advantage to make the spring stiffer as it only holds
> the ball valve in position as the pump pressure pushes it open. If you are
> looking for an increase in operating pressure the only means is to use
> stiffer accumulator springs or shim the current spring. Be very careful
> with the second option as I have seen many broken overdrives created by
> someone thinking that more spacer means more pressure and that is good!!!
> Wrong, it can be very bad if there is too much spacer installed and the
> accumulator springs goes into coil bind during operation without exposing
> the relief ports. This can create extreme pressures to the point where
> parts break!
>
> Steve Yott
>
>
>
> -----Original Message-----
> From: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] On
> Behalf Of 19to1tr6@comcast.net
> Sent: Sunday, July 28, 2013 11:30 AM
> To: team, FOT
> Subject: [Fot] A type O.D.
>
> Hello can anyone tell me the function of the non return valve on the A type
> And if the strength of the spring is changed what would be the resultB B
> thanksB rob _______________________________________________
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