Discussion
You can always tell when I have just aquired a new vintage with all the questions I keep asking 
This time its concerning the oil change to the differential. I drained it out yesterday (Bayliss Thomas) and what came out resembled a very thick black gloop, about one third pint. It was so thick I left it to drain for about an hour, it really was very very thick. You could stand a nail up in it!
I refilled using Castrol ST 90 and it took 1 litre. My Son says ST 90 oil is not correct and it should be thick oil?? My handbook tells me simply use Gear oil.
As usual thoughts and comments gratefully recieved.
This time its concerning the oil change to the differential. I drained it out yesterday (Bayliss Thomas) and what came out resembled a very thick black gloop, about one third pint. It was so thick I left it to drain for about an hour, it really was very very thick. You could stand a nail up in it!
I refilled using Castrol ST 90 and it took 1 litre. My Son says ST 90 oil is not correct and it should be thick oil?? My handbook tells me simply use Gear oil.
As usual thoughts and comments gratefully recieved.
Old B.T. has foxed everyone thats seen it about thus far, 'never erd' of it' is the usual first response followed by me saying 
The manufacturer was/is better known to have manufacturered bikes of the pedal variety later moving onto motorbikes known as Excelsior. The company were called Excelsior Motor Company. They made the cars to order from 1921 - 1929 and about 1000 were produced, only ten now remain, four in Australia.One car is in an Australian museum and one in a museum here. My one and one other are the last 4/5 seat open tourers apparently, this has'nt made it any more valuble in money terms being rare but is a real pleasure to own, dispite the present little problems.
A thought, will the TVR Saggies raise the same situation in 80 years time? I think so.
The manufacturer was/is better known to have manufacturered bikes of the pedal variety later moving onto motorbikes known as Excelsior. The company were called Excelsior Motor Company. They made the cars to order from 1921 - 1929 and about 1000 were produced, only ten now remain, four in Australia.One car is in an Australian museum and one in a museum here. My one and one other are the last 4/5 seat open tourers apparently, this has'nt made it any more valuble in money terms being rare but is a real pleasure to own, dispite the present little problems.
A thought, will the TVR Saggies raise the same situation in 80 years time? I think so.
Edited by crankedup on Sunday 4th March 10:42
I had a similar problem with my diff and I think the oil hadn't been drained since it's first resto in the mid-80s, it had the consistency of margarine, I had to find use a large surgical syringe to inject engine flush in through the drain hole to get the stuff out. After I re-filled it, it's certainly whined less.
I'm not sure of what ST90 is but generally for rear diffs I'm assured that you can't go wrong with Castrol EP90 which has been around for donkeys.
I'm not sure of what ST90 is but generally for rear diffs I'm assured that you can't go wrong with Castrol EP90 which has been around for donkeys.
If you still have the stuff that was drained out you could measure the viscosity but that is only a small part of the specification. The spec. of oil required depends on what type of gears there are in your back axel, straight cut, helical cut etc., what the bearing are made from and if it has a differential. If you know this, then if you phone one of the major oil companies lubricants technical department and you should be able to find an expert can give you reliable advice.
Thank you for views/comments.
My handbook tells me that the rear axle is of the semi floating type and fitted with Timken roller bearings throughout. It goes on to tell me that it is featuring a crown wheel and differential pinnions. I shall contact Castrol today for a confirmation of correct oil to use.
Meanwhile the gloop that eventually came out of the casing still remains on top of the oil catch can I used owing to it being so thick and heavy it refuses to run down into the resovior.
My handbook tells me that the rear axle is of the semi floating type and fitted with Timken roller bearings throughout. It goes on to tell me that it is featuring a crown wheel and differential pinnions. I shall contact Castrol today for a confirmation of correct oil to use.
Meanwhile the gloop that eventually came out of the casing still remains on top of the oil catch can I used owing to it being so thick and heavy it refuses to run down into the resovior.
mind you one or two people have commented about me being part of the living dead 
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