Guy Lowe Posted February 1, 2015 Share Posted February 1, 2015 Try as I might I cannot find anything about this using the search.I am replacing the diff flange and oil seal on a Seirra diff and remember reading that you should seal the spines to prevent any leaks, but I cannot remember which sealant to use.looking at the Loctite web site it looks like is should be either 620 or 660, does anyone know?Thanks. Link to comment Share on other sites More sharing options...
Domus Posted February 1, 2015 Share Posted February 1, 2015 What do you want to seal? If you mean seal the two driveshafts out of the diff the only seal is the one pressed into the diff. The splines provide the drive and run in oil. The only other seal would be one on the propshaft side and would need the diff removing from the car to replace. Link to comment Share on other sites More sharing options...
ECR Posted February 1, 2015 Share Posted February 1, 2015 If there is wear in the splines, the resultant slop frees off the swaged seal in the plate that the nut tightens against. It's enough that oil can run down the splines and through the loosened plate. There's no guaranteed cure (other than new parts) but SPC recommend silicone sealant on the splines and on the joint in the plate. Link to comment Share on other sites More sharing options...
Guy Lowe Posted February 1, 2015 Author Share Posted February 1, 2015 Sorry I should have been more specific, I have the diff out and it is the prop shaft flange & oil seal that I am replacing. When I removed the old flange (R&R rebuild) there was a lot of grey sealant on the splines, that's what leads me to think it is Loctite 620 or 660. Link to comment Share on other sites More sharing options...
Guy Lowe Posted February 1, 2015 Author Share Posted February 1, 2015 No there is no excessive wear, I just thought it was good practice to seal the splines.The driveshaft splines are within the oil seals so there is no need to seal those besides they are constantly sliding in & out, however on the input from the prop shaft, the splines run right through the flange to the nut, therefore oil can seep along the splines. Link to comment Share on other sites More sharing options...
2GBR Posted February 2, 2015 Share Posted February 2, 2015 In my experience these usually leak when a diff has been made up out of bits and bobs from odd diffs and the oil creeps down the splines then under the large washer and nut, And then drips from this point and gets slung around under the car. A semi flexible sealant such as a Wurth product can be used but if the splines are actually well worn then you will probably find that oil still creeps through, Well worth trying to get a few used or a new input flange to try. But not the easiest job to keep changing them chasing an oil leak Link to comment Share on other sites More sharing options...
Guy Lowe Posted February 2, 2015 Author Share Posted February 2, 2015 Thanks 2GBR I think Wurth Silicone Special 250 Red would do it, as I said there is no excessive wear that I can detect & it has not been leaking, I just thought it would be a good precution to take. Link to comment Share on other sites More sharing options...
2GBR Posted February 2, 2015 Share Posted February 2, 2015 If you use a semi flexible product and apply liberally along and around the splines both male and female then push the input flange in and also apply under the large flat washer and to the ID of it also good luck Link to comment Share on other sites More sharing options...
Guy Lowe Posted February 2, 2015 Author Share Posted February 2, 2015 Thank you for the advice 2GBR, however I am a bit confussed as to the "large flat washer" you refere to. I have three 7" diffs here and none of them have washers below the flange nut, they all have flange nuts and no washers? Link to comment Share on other sites More sharing options...
2GBR Posted February 2, 2015 Share Posted February 2, 2015 Yep no worries under the washer of the flange nut, I have also seen a seperate loose washer which fits in the centre of the input flange Link to comment Share on other sites More sharing options...
Guy Lowe Posted February 2, 2015 Author Share Posted February 2, 2015 Thanks for your help Link to comment Share on other sites More sharing options...
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