Oil leak from handbrake drum

[Shakey]

Any common causes before I rip the thing apart? Is it likely to be the seal at the back of the drum or does it mean the rear main has gone?

Thanks
Jake

[Timj]

The seal in the back of the transfer case. Need to replace that and also check the sealing surface on the drive member and either replace or speedi sleeve it if it needs it.

Drop the tailshaft, put the handbrake on and remove the large nut in the middle while you have the handbrake to stop it from turning, remove the handbrake drum and backing plate, remove the drive member, change seal, clean it all up and replace shoes if they are too oily and then put it all back together. You can use a felt seal same as the axle drive members in there as well.

Cheers,

TimJ.

[JDNSW]

While you are at it, check the preload on the output bearing (set by shims under speedo drive housing) to make sure that the problem is not the shaft wobbling (unlikely - just before undoing the big nut, with the handbrake off, ensure that there is absolutely no sideways movement on the drum).

And remember to drain the transfer case oil before starting the job, otherwise you will have a considerable mess.

John

[Shakey]

Thanks guys, the gearbox is going back in a rebuild and hasn't been used for a few years so won't be able to put the handbrake on but I'll figure that out!

Dropped the oil this morning so will give it ago later - TimJ do you mean the bit the tail shaft connects to when you say drive member?

Thanks

[Timj]

Yes, that's the bit i meant, its actually called an output flange. Brain fade at the time :).

[Shakey]

What size are these nuts, 9/16 is to small and 14mm to big. https://www.aulro.com/afvb/images/imported/2016/01/624.jpg

[gromit]

What size are these nuts, 9/16 is to small and 14mm to big. https://www.aulro.com/afvb/images/imported/2016/01/624.jpg

5/16" Whitworth ?


Convert,compare all Imperial tool,nut and bolt sizes to metric. (http://www.baconsdozen.co.uk/tools/conversion%20charts.htm)


Colin

[Shakey]

Thanks Colin, guess I'll need to add some whitworth to my collection (they weren't tight so the nutfeckers worked.

In other news is oil on the shaft good or bad (I'm hoping good otherwise I assume it's transfer box off)?

https://www.aulro.com/afvb/images/imported/2016/01/623.jpg

[JDNSW]

5/16" Whitworth ?


Convert,compare all Imperial tool,nut and bolt sizes to metric. (http://www.baconsdozen.co.uk/tools/conversion%20charts.htm)


Colin

From memory, actually 3/8" BSF - which is the same spanner size.

You will find that there are quite a few Whitworth/BSF sizes on all Series Landrovers. Fortunately, one of the most common ones, 1/4"BSF, is close enough to either 7/16"AF or 11mm. But some other sizes are essential.

In my experience, markets, OP shops, garage sales etc are a prolific source of very cheap Whitworth/BSF spanners, often very good quality.

John

[Shakey]

So for clarification as noob then, the output shaft seal is this one located in the speedo pinion housing and can be pressed out and replaced?

https://www.aulro.com/afvb/images/imported/2016/01/618.jpg

[Aaron IIA]

So for clarification as noob then, the output shaft seal is this one located in the speedo pinion housing and can be pressed out and replaced?

https://www.aulro.com/afvb/images/imported/2016/01/618.jpg

Yes. Did you measure the bearing preload before you removed the speedo drive housing? It doesn't actually have to be removed to change the seal.

Aaron

[Aaron IIA]

In other news is oil on the shaft good or bad (I'm hoping good otherwise I assume it's transfer box off)?

That shaft should be oily. It is inside the transfer case.

Aaron

[Shakey]

Yes. Did you measure the bearing preload before you removed the speedo drive housing? It doesn't actually have to be removed to change the seal.

Aaron
The manual doesn't say you have to when overhauling the speedo housing, why would that have changed?

[B.S.F.]

The manual doesn't say you have to when overhauling the speedo housing, why would that have changed?
Because a loose or badly adjusted bearing may be the cause of the flogged seal. To measure the correct preload you have to remove the bottom of the transfer case or you may be able to do it by removing the plate on top. (See workshop manual).

[Aaron IIA]

If you had any wobble on the shaft before you took off the speedo drive housing, it would indicate insufficient preload on the bearings. A wobbly shaft will wear the seal and cause it to leak oil.

Aaron