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The Season of Gearbox Removal


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Hi Folks,

it is that time of year (again, again........)

 

On Sunday we went out to meet the Thames Valley group.

Had a nice chat to a couple and then shot off to the coast for cockles.

 

Half way to the coast I noticed that Overdrive wasn't doing its thing.

 

Today I removed the tunnel etc to get a good look at things.

 

The electrics and external mechanics are all working fine.

Yesterday I put in a small amount of oil - not enough to cause the problem.

 

In the next half hour I shall take it for a test run and move the jigging lever by hand to see if it is out a little.

 

I have a feeling something inside has gone awry. :o

 

The good thing is that the new Q-seals apear to have worked on the selector rods - no oil leak.

 

Roger

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What a pain.

Gets to that time of year for serious use and they play up

????

Hope it's something cheap and simple.

H

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Hi Folks,

it is that time of year (again, again........)

 

On Sunday we went out to meet the Thames Valley group.

Had a nice chat to a couple and then shot off to the coast for cockles.

 

Half way to the coast I noticed that Overdrive wasn't doing its thing.

 

Today I removed the tunnel etc to get a good look at things.

 

The electrics and external mechanics are all working fine.

Yesterday I put in a small amount of oil - not enough to cause the problem.

 

In the next half hour I shall take it for a test run and move the jigging lever by hand to see if it is out a little.

 

I have a feeling something inside has gone awry. :o

 

The good thing is that the new Q-seals apear to have worked on the selector rods - no oil leak.

 

Roger

Hi Roger

What is it with gearboxes.

Hope to take mine for a test drive this week after replacing hubs, drive shafts and a re-balanced prop. So i'm hoping my gearbox will be OK after the last episode. I don't hold out much hope.

 

Good luck with yours and hopefully it's nothing major.

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Hi Folks,

it is that time of year (again, again........)

 

On Sunday we went out to meet the Thames Valley group.

Had a nice chat to a couple and then shot off to the coast for cockles.

 

Half way to the coast I noticed that Overdrive wasn't doing its thing.

 

Today I removed the tunnel etc to get a good look at things.

 

The electrics and external mechanics are all working fine.

Yesterday I put in a small amount of oil - not enough to cause the problem.

 

In the next half hour I shall take it for a test run and move the jigging lever by hand to see if it is out a little.

 

I have a feeling something inside has gone awry. :o

 

The good thing is that the new Q-seals apear to have worked on the selector rods - no oil leak.

 

Roger

Roger do you have a link for the Q seals please?

Stuart.

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Hi Stuart,

I got them from these people http://maydayseals.co.uk/35-quad-rings

 

I can't find the number at the mo but give then a ring - it is 1/2" ID.

 

I'll look in the garage shortly.

 

Roger

If you have the measurements would be helpful, thanks Roger.

Stuart.

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Hi Neil,

the electrics were working fine.

This morning I pushed on the little lever but still no OD.

 

I'm sure something has gone adrift inside.

 

We'll see. The box is now at the workshop for investigation/repair.

 

Roger

Roger

It will be interesting to see what you find as they rarely fail like that.

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Hi Tim,

the electrics are working correctly. The solenoid pulls in and the jigging arm moves to the correct place.

 

Hi Stuart,

the seal is described as Q112 Nitrile Quad Ring. JF410 Quad Ring.

 

The Q = quad Ring

112 = standard designation for 1/2 O ring.

 

1/2" ID 11/16 OD

 

Roger

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I still suggest that the continuity across each gearbox switch is checked. In normal operation there should be no resistance when a gear is selected, but switches with dirty contacts sometimes work and sometimes don't depending on the level of resistance present, which varies. If nothing else it is a simple low cost check so worth a try.

 

Tim.

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Hi Tim,

the electrics really are OK - honest.

The switch works every time. The solenoid comes in and stays there every time. The little lever on the right hand side for jigging the 'thing' moves with the solenoid.

 

It can't be the top cover switches as every thing moves when it should.

 

The only problem is that the OD does not engage its gear.

 

Anyway - it's too late now. The box is at the engineering workshop awaiting diagnosis.

 

Roger

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I have just done the selector shaft seals and they are still not quite big enough for the depth of the recess in my cover, (3.34mm depth) I have added a nylon backup ring to the outside of the seal, they come from the same company as the quadrings, they are part number AE112.

Now the retaining plate really holds the seals tight.

John

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Dunno if relevant, but to get my O/D to engage I had to put the car up on jack stands and adjust/tune the lever on the driver's side until I got proper engagement.

The lever ended up at least a 1/4 of an inch past the "alignment" dimple cast into the side of the gear box. No problems since.

The Moss cattledog has an O/D trouble shooting section on the page showing the overdrive bits.

Edited by littlejim
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Hi Martin,

well spotted. I didn't undo the pinch bolt and only realised that when coming home form the gearbox workshop.

 

I also didn't check the two spring loaded balls :o

 

Never mind! I'm getting pretty good at removing the GB. I only hope the workshop does not take too long in sorting it.

 

Roger

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  • 3 weeks later...

I have just done the selector shaft seals and they are still not quite big enough for the depth of the recess in my cover, (3.34mm depth) I have added a nylon backup ring to the outside of the seal, they come from the same company as the quadrings, they are part number AE112.

Now the retaining plate really holds the seals tight.

John

Do I fit

 

1. Q seal

2. Q seal + back up ring

3. Standard O ring

4. Standard O ring + back up ring

???

Alan.

Edited by AlanG
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Hi Alan,

if you have never been plagued with oil leaks from the rods then stick with O-rings

 

I have used Q-rings without backing plate. In theory a sliding movement of a ring seal should make no difference.

But if your supplier can do a backing ring then use it.

 

Roger

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Roger

An O ring that moves in its location, will pump oil, It must be retained to effect a seal. I'm sure the current O rings are not the same as those originally used. That's why there is always a leak there.

 

Alan

measure the depth of your O ring recess, I found that the quad ring still had some play so I added the backup nylon washer on the outside just under the keep plate.

I haven't done a lot miles since but will keep an eye on it, must be better than the current O rings offered.

John

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