I would be looking for a bleed somewhere & check the pump, valves, etc, and
try to get the pressure up a bit.
Is it a big or small piston A?
Does the accumulator hold "rest" pressure for some time?
Glen
(w/1 n)
-----Original Message-----
From: Glenn Franco via Fot <fot at autox.team.net>
To: FOT list <fot at autox.team.net>
Sent: Wed, Aug 1, 2018 2:18 pm
Subject: [Fot] A-Type Overdrive Dilemma
Looking for some help from the wisdom of the FOT List.
I have rebuilt a number of Triumph A-type overdrive transmissions in the last
few months but have one that is giving me problems.
The overdrive functions OK when applied and will go into overdrive at a steady
cruising speed.
The problem is when under load accelerating up a hill or to pick up speed it
softly drops out. When you lift throttle it will go back in.
We put a 500 psi gauge on the operating valve thinking we were losing oil
pressure when it drops out of overdrive. Gauge reading shows a pretty steady
340 psi reading. When it drops out the gauge doesn't drop out but remains
steady.
340 psi is lower than the expected 400 - 500psi. Does that indicate oil pump
replacement is necessary? The engine rpm was approximately 2500-3000 rpm.
Since it softly drops out of overdrive I'm thinking a slipping overrunning
clutch??
Any advice would be greatly appreciated.
Thanks in advance
Glenn Franco
74 TR6 , TR250, MG TC, BMW e10 2002
_______________________________________________
fot at autox.team.net
http://www.fot-racing.com
Archive: http://www.team.net/pipermail/fot
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://autox.team.net/pipermail/fot/attachments/20180801/5b60eecb/attachment.html>
|