You want photos? I got photo's for ya, so buckle up for a treat of a trip into automotive astonishment.... in the mean time, here's an update!
I noticed the other day a nice a damp patch of oil on the floor under the steering box and thought it might be a good idea to fix this before everything goes back on the car.
The Bentley manual says it is wise to bolt the steering box to a tube similar in diameter to the front beam to allow it to be worked on easily.
This sounded like a great idea, so in the absence of a tube of the correct diameter, I tried to 'think outside the box' for a moment and came up with this idea....
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06056.jpg)
This next picture shows where the oil was seeping from. You'll notice a damp and shiny patch under where the steering column input shaft sticks out.
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06059.jpg)
First up is to remove the top cover. I removed the 19mm drain plug. For reference, when bolted in the car and on level ground, the level should be filled to the bottom of the threads with EP90 transmission oil only.
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06060.jpg)
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06061.jpg)
Followed by the four 14mm bolts that hold the top cover in place.... The gasket is in perfect condition which was a nice surprise.
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06062.jpg)
I was delighted with how clean and un-worn everything looked in there!
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06065.jpg)
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06066.jpg)
I then removed the pre load spring and pin from the main shaft....
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06070.jpg)
Which leaves a nice hole at the top of the shaft...
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06073.jpg)
I then released the pinch bolt that secures the adjustable input shaft and seal carrier - 17mm for the record.
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06075.jpg)
To release and remove the main shaft, you must first release the pitman arm from the bottom. It won't come off due to the lower beam tube being in the way, but is released when you pull the shaft up from above. Slackening the box clamps to the top tube and rotating it on the tube would allow it to come off, but as the shaft is coming out anyway, I decided to leave the box in it's pre-aligned position.
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06079.jpg)
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06081.jpg)
Lifting the shaft up releases the ball jointed upper part of the worm drive which is an interesting piece of kit....
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06084.jpg)
The arm just pulls out at this point.
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06085.jpg)
Note the recessed section half way down it's length? This is to allow oil to surround the shaft which drains to the shaft via a hole in the lower side wall of the main reservoir. You can see this hole half way down the tube on second and third pic in this sequence...
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06087.jpg)
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06090.jpg)
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06092.jpg)
At this point I wanted to be 100% sure of exactly where the leak was coming from, so I tilted the axle back to level the steering box and force the now low oil level up the input shaft to the seal and see what happened.
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06078.jpg)
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06077.jpg)
After a few turns lock to lock, it was pretty clear that the input seal was the culprit...
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06094.jpg)
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06096.jpg)
The seal is housed in an intermediate housing with a helically machined groove that the pinch bolt sits in. By turning this shaft with a large 27mm spanner, you actually push it in or out of the box to keep it firmly against the bearing which sits within the box.
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06076.jpg)
Waggling it back and forth also helps to release it and pull it clear. These next two pictures are of it sitting on the end of the shaft as if I'd just removed it, but you'll notice that it's clean as I'd already cleaned it up to inspect it and the bearing before I'd remembered to take these two shots.
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06098.jpg)
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06099.jpg)
Here, you can just make out the position of the bearing at the end of the main housing.
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06100.jpg)
And here it is....
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06103.jpg)
The seal in the end is a very disappointing affair being a basic pressed tin cup with a felt 'bush' in to act as a seal. No wonder they are prone to leaking. I guess they didn't make lip seals that small back in the day? It is pressed into the end of the shaft and just pops out with a drift.
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06105.jpg)
![UserPostedImage](https://i83.photobucket.com/albums/j301/last_triumph/Oval/DSC06106.jpg)
Having phoned all the specialists I could think of and being told that the seal is no longer available and that I should 'upgrade' to the later '61> steering box, I decided that I'd accept the challenge and find one.
A morning spent on the phone to all my old engineering contacts plus a few new ones seemed like it was going nowhere - maybe they were right - maybe you just can't get this seal any more? After a bit of a wild goose chase I eventually found a supplier who, after checking in their stores came up with the perfect sized nitrile NBR lip seal!!!
Result!!!
And yes - I bought them all!
Early steering boxes are safe now boys and girls!
As soon as they arrive in the post, I'll put it all back together and report my findings.
That is all.
Edited by user
13 years ago
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Reason: Not specified
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