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I don't think the unidirectional (overrun) clutch can slip. It can
only break and you would know it. I'd guess it is just slipping.
350 is about right for a large accumulator model, but you need about
450 for a small accumulator. Low pressure is usually just spring
fatigue. That can be fixed by shimming the spring with a couple of
hardware store washers. I'd get the pressure up to spec first before
anything else. I suppose the type of oil might cause slipping too.<br>
- Larry Young<br>
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<div class="moz-cite-prefix">On 8/1/2018 12:02 PM, Glenn Franco via
Fot wrote:<br>
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<div>Looking for some help from the wisdom of the FOT List.</div>
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<div>I have rebuilt a number of Triumph A-type overdrive
transmissions in the last few months but have one that is
giving me problems.</div>
<div><br>
</div>
<div>The overdrive functions OK when applied and will go into
overdrive at a steady cruising speed.</div>
<div><br>
</div>
<div>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.</div>
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<div>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.</div>
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</div>
<div>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.</div>
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</div>
<div>Since it softly drops out of overdrive I'm thinking a
slipping overrunning clutch??</div>
<div><br>
</div>
<div>Any advice would be greatly appreciated.</div>
<div><br>
</div>
<div>Thanks in advance</div>
<div><br>
</div>
<div>Glenn Franco</div>
<div><br>
</div>
<div>74 TR6 , TR250, MG TC, BMW e10 2002</div>
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