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Y Ddraig Goch

TR6 - A Type Overdrive -disengages when accelerating

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First time using the Forum today although I confess to being an avid follower and have benefitted from some great advice and tips.

 

I have a Type A Overdrive in my 1970 TR6 which engages straightaway when switched on however it has recently begun to disengage under acceleration?

 

Almost like having a kick-down in an auto transmission vehicle!

 

It quickly re-engages when the throttle is backed off and will cruise happily until an incline is encountered or any additional power is applied.

 

Oil level was fine when last checked prior to being put away for the winter, although that was a little while ago, the car hasn’t been out much (once this year!)

 

Suggestions greatly appreciated… :)

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It sounds like the overdrive cone clutch is slipping.

This can be caused by a number of things. The clutch may be worn or not being held in position due to insufficient oil pressure.

Low oil pressure can be caused by leakage in any part of the hydraulic circuit and could be the actuating pistons, the operating valve, the accumulator piston, or the pump itself may not be producing the pressure. It could be as simple as a blocked filter but to be fair if theres enough debris in the box to block the filter then you have big problems.

You can analyse a lot of these problems with the tunnel off and the car on axle stands but unless you are au fait with the workings of the overdrive the quickest and easiest option may be to remove the overdrive and have it rebuilt by a specialist.

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Thank you all for the suggestions and help - v much appreciated - I'll take the easier and least costly option first and check the solenoid, electrics side of things.

 

Are there any recommendations for Overdrive specialists in the North West/North Wales area?

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Mine is misbehaving too!...and is an A type..works when cold but not hot...I want to check and if necessary change the solenoid on mine .... How do you get to it to do this please?

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Mine is misbehaving too!...and is an A type..works when cold but not hot...I want to check and if necessary change the solenoid on mine .... How do you get to it to do this please?

Hi Jogger,

The solenoid is on the rear left side of the OD and coincides with the left leg of the 'H' dash support.

You will need to remove all tunnel and all that covers it.

 

Roger

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Hi Jogger,

The solenoid is on the rear left side of the OD and coincides with the left leg of the 'H' dash support.

You will need to remove all tunnel and all that covers it.

 

Roger

Which isn't a bad thing as there is a lot of wiring connections and switches under the tunnel which may hold the cause of your problem. There's also a clearance on the overdrive actuator shaft that may need checking.

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