[Fot] A-Type Overdrive Dilemma

[M&M Hado]

Also, check the eight O.D. springs to make sure they are the correct ones and in the right location.  If a “long” one is installed where a “short” one should be, the coil may bind before the clutch has moved the full distance and will slip or not engage at all.

 

Mike

 

From: Fot [mailto:fot-bounces at autox.team.net] On Behalf Of fubog1 via Fot
Sent: Wednesday, August 1, 2018 4:00 PM
To: brakey6666 at gmail.com; fot at autox.team.net
Subject: Re: [Fot] A-Type Overdrive Dilemma

 

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

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