hahuang65 Posted July 28 Posted July 28 Quick question...the sealer on my differential has basically come off during installation. What should I use to re-apply a new seal?
wdb Posted July 28 Posted July 28 My WAG is that that is excess sealant that squeezed out during assembly. Should not be a concern. 1
IamScotticus Posted July 29 Posted July 29 (edited) I'm surprised sealant was used at all. Doesn't the gasket have bonded rubber? I don't know what it is. The cover on my Chevy diff gets 9 bolts hand tight, no sealant. No leak in 189k. Edited July 31 by IamScotticus
jbcollier Posted July 31 Posted July 31 As mentioned, this is typical on differentials: all fine. For future reference, it is normal for a similar amount of excess to be pushed out inside as well as outside. In an engine, this is not good. Chunks may break away and get where they shouldn't*. Use silicone sealer sparingly. You want enough, not too much. More is not better. Also, gear oils can attack many engine-oil safe silicone sealers. Use one that is rated for gear oil. * Had a Maserati BiTurbo come in that had been "overhauled" with the addition of silicone sealer. Some broke away and plugged the oil passage to one of the heads. While barrelling down the highway at a prodigious rate of knots, the cams decided they no longer wished to rotate. It wasn't pretty. 1
IamScotticus Posted July 31 Posted July 31 @hahuang65 Do you have a pic or part number of that gasket?
wdb Posted July 31 Posted July 31 27 minutes ago, IamScotticus said: @hahuang65 Do you have a pic or part number of that gasket? There may not be any gasket. A lot of modern cars have no gasket in places there used to be gaskets. Precisely machined parts + RTV type sealants = no leaks.
IamScotticus Posted July 31 Posted July 31 (edited) 1 hour ago, wdb said: There may not be any gasket. A lot of modern cars have no gasket in places there used to be gaskets. Precisely machined parts + RTV type sealants = no leaks. The Sierra diff, if that's what he has, was introduced in the mid-80s Edited July 31 by IamScotticus
hahuang65 Posted July 31 Author Posted July 31 @IamScotticus I can't visibly see a gasket. I think it's just the sealant. It's a BMW diff, and I believe it's this part: https://caterhamparts.co.uk/differentials/4452-differential-bmw-391-including-backplate-bracket.html
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