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overdrive solenoid issue


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Hello,

Recently replaced solenoid and new overdrive wiring together with EP80 90 GL4 oil. Getting click clack from relay and solenoid however when driving overdrive not functioning. I have moved forward the adjustment with the drill bit lever a bit but still no go. Moved a little further and lost reverse gear? I undid the solenoid bolt so it did not come into play and reverse now resumed. Any thoughts please?  Now thinking to flush the gearbox / overdrive and refill with Penrite oil which I know some people prefer.

Other than that I'am a bit lost.

Thanks

Kevin

 

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59 minutes ago, kevine said:

Hello,

Recently replaced solenoid and new overdrive wiring together with EP80 90 GL4 oil.

Thanks

Kevin

 

Is there enough oil in the box ?

EP and gear oil work but it does take time for the oil to level out into the od and needs topping up.

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When you say there is no reverse - do you mean the gear selects  OK  but the car doesn't go backwards ?   If so that suggests to me that you had adjusted the solenoid so far in that the OD was always on;  the failure to reverse being due to the locking mechanism in the overdrive.  In that case you are lucky if nothing broke as ODs do not like going backwards. 

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Thank you RobH, 

Yes was able to engage reverse, but no movement. It may be the adjustment went too far and as you suggest the overdrive in reverse may apply.

Reverse restored after slackening/loose the adjustment bolt, and all gears working ok. It may look as the overdrive has been compromised.

I will await to see other comments as I'am not going anywhere soon.

Kevin

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Possibly your new solenoid is duff.  It may 'clack' but if it can't push hard it won't do anything. There are two windings on an A type - one high current to give some grunt and then a low current one to hold it in once it has moved.  Maybe only the low-current one is working so you get the noise but not the action? 

 

 

 

 

Edited by RobH
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Is it an A or J type?

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19 minutes ago, kevine said:

A Type

Most likely the solenoid isn't pulling in properly or adjustment. If the od was working before it is highly unlikely to be an internal problem. The oil must be extraordinarily low for the od not to work.

When you engage the overdrive check that the solenoid is pulling up properly. It can click but not pull all the way up. How much it pulls might depend on the application but a good 6mm or 1/4" should be about right.

I find with mine the normal use of a bar through the hole in the arm doesn't work with the wear in the overdrives now. I'd suggest you take it a mm or two further than the book adjustment.

DO NOT PUT THE CAR INTO REVERSE IF YOU SUSPECT AT ALL THE OD IS ENGAGED. IT IS A SURE WAY TO LITERALLY BLOW THE OD AND GEARBOX APART.

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17 minutes ago, John McCormack said:

Most likely the solenoid isn't pulling in properly or adjustment. If the od was working before it is highly unlikely to be an internal problem. The oil must be extraordinarily low for the od not to work.

When you engage the overdrive check that the solenoid is pulling up properly. It can click but not pull all the way up. How much it pulls might depend on the application but a good 6mm or 1/4" should be about right.

I find with mine the normal use of a bar through the hole in the arm doesn't work with the wear in the overdrives now. I'd suggest you take it a mm or two further than the book adjustment.

DO NOT PUT THE CAR INTO REVERSE IF YOU SUSPECT AT ALL THE OD IS ENGAGED. IT IS A SURE WAY TO LITERALLY BLOW THE OD AND GEARBOX APART.

This is what you get if you do.

An exploded uni directional clutch.

 

DB2154BE-9B75-4AF2-8688-B97DBA15A3B1.jpeg

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Most of my type A O/D problems have been electrical. I've now installed a permanently wired indicator bulb to confirm when the solenoid's getting power. My car was purchased with the O/D permanently on- set up by a kamikaze hillclimber. If reverse is engaged with the O/D on the car will kind of kick a bit when the clutch is released, persist and eventually the directional clutch  will fail. This originally  led me to investigate the wiring.

I can see how the G/B reverse switch  can lock out the O/D in reverse but I can't see how a poorly adjusted solenoid will lock out reverse gear.

As pointed out above, if the G/B oil level is down the TR6 reverts to O/D off mode. Your oil spec  should be OK provided the level is correct.

Edited by Mike C
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Spoken to gearbox and overdrive specialist dealing with our cars and whilst they cannot take the car in, I will not be able to remove gearbox and overdrive at home.

Suggestion was flush the gearbox and overdrive out using automatic transmission fluid and run for approx 30mins. I think I will try this. I also disabled the solenoid and used the lever to see if the overdrive kicked in . Alas no joy. Will report back when I have news

Thanks

Kevin

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Happy Chap.

I list the following and not sure if all technically correct but my issue is now fixed.

Firstly flushed the gearbox and overdrive twice with Automatic Transmission fluid with running the engine in the garage in gear. (Back wheels off the ground)

Removed operating valve to clean. I think it was blocked or partially blocked. ( Thanks Dingle)

Refilled with Penrite GB40 oil

Gearbox pressure checked and is all good as per Brown Bible

Adjusted the lever a couple of mm beyond the drill hole and gearbox hole setting and set solenoid.  Thanks John McCormack.

My question now is was the operating valve blocked and still maintained pressure (overdrive engaged) when I put in reverse?

Anyway thanks to all as all good now

Kevin

 

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Brings back memories of a few years ago when mine stopped working as soon as I'd driven half a mile..Replaced the solenoid, switch..Didnt fix it

 

I took the tunnel off and drove it with the gearbox exposed and operated the overdrive lever without the soenoid attached with a piece of string..proved nothing was wrong with the o/d unit..and has been pointed out DON'T EVER PUT IT IN REVERSE WITH OVERDRIVE AS IT DESTROYS IT

In the end it was a replacement overdrive wiring loop that solved my problem..something strange was happening once the old loom got warm from the engine and was cutting power to the solonoid and stopping it operate.

Pleased you have got yours sorted..They are not very nice to drive without an overdrive on fourth

 

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