Posted 22 February 2012 - 07:56 PM
I just finished taking out the differential on my 94 Cooper. My initial assessment is that the gearbox appears to be rebuildable. The differential carrier needs to be replaced. At least one of the ouput shafts has some damage.
What is left of the pin, thrust block and pinions
Any other observations or comments? By the way the car is supposed to have just over 70000Km. it broke with no warning.
Posted 22 February 2012 - 08:01 PM
Posted 22 February 2012 - 10:27 PM
Yes, it did lately. But it was driven just short distances twice a month. Is this amount of wear to be expected with under 45000 miles?
yeah it happens it must have clonked now and again with a diff pin that worn
Posted 23 February 2012 - 01:33 AM
The output shafts look like this:
This one has a high spot that needs to be cleaned up
This one is more beat up
Posted 23 February 2012 - 01:51 AM
me personally i would fully strip and inspect it and replace the casing as i dont like the look of the chunk missing next to the main bearing in the casing.
Posted 23 February 2012 - 07:26 AM
Where the diff has taken a small chunk out of the main web, that'll develop into a crack then then potentially a bigger failure further down the line.
Posted 03 March 2012 - 02:33 PM
My question now is the engine. Do I need to do anything with the engine. The oil filter protects the engine from all the metal particles the came from the differential. But what about the oil pump? Does it need to be removed and inspected?
Edited by xrocketengineer, 03 March 2012 - 02:33 PM.
Posted 03 March 2012 - 09:22 PM
Posted 12 March 2012 - 07:00 PM
I will throw my 2 cents worth in here -- I have been running regular, non-High mileage Castrol GTX 20-50 in my classics year round for a l.o.n.g time and it has worked well. Many moons ago, there was a guy called Crazy Mike that had worked at Seven Ent when they were still in Virginia and he heavily autocrossed a ratty looking but very quick classic Mini with amazing success. He ran M*b*l* One synthetic oil as he wanted to have the "best oil" he could to protect the engine/gearbox. Sometime after he switched to synthetic, the car started to experience differential failure. He asked the manufacturer of that oil if there was a problem using their synthetic oil in the classic Mini. He got a reply that their synthetic oil was fine in the engine, also in the gearbox, but the shear forces generated in the differential (which uses the same oil as engine and gearbox) would break down their synthetic oil and they recommended he not to use it. I actually saw that letter, so this is not heresay, and ever since, I have not considered using synthetic in my classic Minis."
Maybe this is proof of the statement. In three years and a little over 2000 Km of using Mobil1 15W-50 this happened.
Posted 12 March 2012 - 10:54 PM
Have you considered replacing the standard diff with a cross-pin. They really are good for higher powered Minis, although I did manage to break one.
Posted 12 March 2012 - 11:36 PM
Was the pin worn out already when I bought the car (made out of chocolate syndrome)? Or, the synthetic oil can not take the loading in the differential as stated in the FAQ's and in just 2000Km can accelerate the wear to the failing point. Notice in the pictures that the pin is worn to half of its diameter.
If it is the second case, then potential oil leaks from using synthetic oil people talk about is not even an issue. The destruction of the differential in just a few miles of very light use when using synthetic oil would be the concern.
Posted 13 March 2012 - 01:30 AM
Posted 13 March 2012 - 02:38 PM
Edited by xrocketengineer, 13 March 2012 - 02:39 PM.
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