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Post by danie on Mar 19, 2010 22:10:36 GMT 2
As mentioned under another post, I have stripped two front and two rear diffs before - on all diffs both pinion bearings were in good condition, while both inner housing bearings (part no 2101 - 2403036 were worn to a certain extend. One of these bearings almost collapsed completely in my Lada's front diff. While having a close look at the location of the front diff oil filler plug, it became clear that if the diff gets filled with oil only until the oil starts to overflow, the (worn) bearings would still not be in touch with the oil level - see pic below: (The black pen points at the bottom of the oil filler hole, while the top of the ruler indicates the normal oil level. The rollers of the bearing (part no 2101 - 2403036) on the pic would clearly be above the oil level.) I decided to overfill my Lada's front diff in future, until the oil reach the top of the filler hole. This means the oil level will be about 22 mm higher, and both inner housing bearings will always be in touch with the oil - see pic below. (The top of the ruler, now level with the top of the filler hole, shows that some of the bearing rollers will be in touch with the oil at all times) In order to make this overfill easier in future, I have drilled and tapped a hole in the filler hole plug, and I have made a stainless steel "funnel" - which will be mounted on the plug permanently. A socket has been welded on the inlet (top) of the "funnel", and a new plug will seal the funnel . In future I should be able to fill the front diff more easily, while standing next to the car - see "funnel" below: Danie
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Post by Ari Bezuidenhout on Mar 19, 2010 22:37:44 GMT 2
Hi Danie
This is very interesting. Wouldn't the turning of shafts and the vehicle's motion move the oil and splash it up?
ari
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Post by danie on Mar 19, 2010 22:52:42 GMT 2
Correct Ari - those bearings are supposed to be lubricated by "splashing" - mainly caused by the Crown wheel, and inner diff housing.
My concern is - would there be enough splashing when the car is moving slowly ?
Also, if the oil seals are leaking and the oil level gets low, I think there is a huge possibility that those bearings will be running without proper lubrication.
Bottom line - why do those bearings seem to wear faster than the other ones ?
Regards
Danie
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Post by lada & korean parts on Mar 20, 2010 1:32:43 GMT 2
hi Danie,
we don't usually have problems with bearings in those diffs.......
what grade oil are you using??
should be good quality 85/140
have to careful with overfilling that you don't start popping seals......
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Post by danie on Mar 20, 2010 7:45:45 GMT 2
Hi Andy
I know that you recommend 85w140 for warm areas, but since I bought my Lada I use 80w90 GL5.
As far as I know a thinner oil like 80w90 would splash easier than the thicker 85w140 - but I must admit, my theory could be completely wrong. I think with better splashing, there is a better chance that those bearings will get proper lubrication.
I do not think the oil seals will pop at a slight (22mm) overfill. I do have knowledge and technical experience about oil seals in high pressure pumps - oil seals only pop when breather holes are blocked, and not when pumps have been overfilled.
Like in high pressure pumps, the air inside the diff will expand when the diff becomes hot - but the expanded air will escape via the diff breather cap. So as long as the diff breather cap is not blocked, the chance that the seals will pop, is almost non existent.
A 22mm overfill sounds like a lot of extra oil - but in fact, it's not. Just remember that big parts of the pinion gear, inner diff housing, and other components will be submerged in the oil - so it will not take that much oil to rise the level with 22 mm.
If bought in South Africa at one of the agents - the price of those two bearings are R495.00 each (excl. 14% VAT) . That means a total of R1120.60 for only two bearings...........which probably explains why it is so important to make sure that the diffs are properly lubricated, at all times.
Regards
Danie
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Post by danie on Mar 21, 2010 8:35:35 GMT 2
If imported directly from Russia, those two bearings can be bought for US$18.00 each + airfreight cost (US$25.00)
Total cost for two bearings + airfreight + import tax + VAT = R499.02 (Calculated at current exchange rate - US$1.00 = ZAR7.33)
Danie
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Post by Ari Bezuidenhout on Mar 21, 2010 9:42:08 GMT 2
Hi
So it is buy 1 get 1 free if from Russia. Interesting?
Ari
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Post by ronnie on Mar 21, 2010 11:13:36 GMT 2
Hi Danie
It shows how much profit the agents make. And no doubt they buy in quantity and gain also in shipping charges for the same reason.
Regards
Ronnie
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Post by danie on Mar 21, 2010 12:57:25 GMT 2
Hi Ronnie
Don't forget about the discounts which the agents get on large orders. When I once ordered spareparts from Graf Corvet, I've been offered a number of discounts - the bigger the order, the more discount one gets.
I can't remember exact figures, but if an order exceeded US$1000.00, the discount was something like 10 or 15 %.
Regards
Danie
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Post by lada & korean parts on Mar 22, 2010 1:59:09 GMT 2
you have to remember,if it's one of those russian sites like the ebay ones,most of their stuff is not genuine parts.........few of our customers have been there done that...........
oil: that oil is WAYYYYYYY to thin for our conditions....it would be like water once you started doing couple of k's,85/140 is recommended......... as i said,we don't have problems with those bearings at all........(usually) ;Op
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Post by danie on Mar 22, 2010 6:51:21 GMT 2
Hi Andy I must say I did not have any problems with part, or service quality when I ordered parts from Valerij Nekrasov (Graf Korvet) before. The service was excellent, and Valerij really did a good job in finding the correct parts I wanted. The prices were the same as quoted by Ladaparts.ru.
On my previous order, the parts have been delivered 19 days after payment - at my street address at work.
I know about more local owners who ordered parts from the same source before, and I haven't heard about any complains yet.
Thanks for the advice about oil - will also try 85w140 in future.
Regards
Danie
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Post by lada & korean parts on Mar 23, 2010 2:22:59 GMT 2
hi danie,
never heard of him. but there are a lot of shonks out there
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