04-12-2014, 10:22 PM | #41 |
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Join Date: Jun 2010
Location: College Station, Tx
Posts: 326
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Re: Rear main seal
I am using the new neoprene, it leaks and I know of three others that also leak. My thought stay away
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04-13-2014, 01:38 AM | #42 | |
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Join Date: May 2010
Location: South California
Posts: 6,188
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Re: Rear main seal
Quote:
What I'm wanting to know, is the 'new neoprene' that you are using....the Burtz seal which is one piece, or some others' creation, i.e.---some supply place/seller ? Quality is number one,eh ! Proper installation is also #1, but if seal is quality #2...well ? Reason I'm asking/curious, is that I've run a Burtz rear seal for 10 years in the B that is in my '30 roadster...without a drop of leaking ! I'm aware that the crank seal surface has to be 'dead smooth and concentric', to expect it to seal properly. To prove this and as an example of proof...I had a NEW crank to install at that time...so the Burtz worked ! Now need to do same operation again (B engine again)...BUT no new crank, but reground this time. |
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04-13-2014, 02:47 AM | #43 |
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Join Date: May 2010
Location: Campbell,CA, USA
Posts: 325
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Re: Rear main seal
The "Burtz" radial lip seal is made of Nitrile, not Neoprene.
Evey type of seal needs the seal rubbing surface to be concentric to the rear main bearing journal and smooth to function. Main bearing clearance also needs to be tight. Packing type seals (asbestos, teflon, cork, felt, etc) rely on the compression of the material when the engine is assembled to maintain contact with the seal rubbing surface. When they wear just a little (bearing clearance increases), seal compression is lost and they will leak. Radial lip seals are different because they have a flexible lip to maintain contact with the seal rubbing surface. The flexible lip is able to maintain contact with the rubbing surface much longer than packing type seals, however they will leak when bearing clearance and RPM's become large enough where the lip of the seal cannot respond quick enough to maintain contact with the rubbing surface. Clear as mud? |
04-13-2014, 07:57 AM | #44 | |
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Join Date: May 2010
Location: Gardiner Me.
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Re: Rear main seal
Quote:
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04-13-2014, 08:10 AM | #45 |
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Join Date: May 2010
Location: Gardiner Me.
Posts: 4,200
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Re: Rear main seal
Hardtimes wanted me to post one of my builds. This one has welds on counter weights and insert rods, complete balance job. Walt
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04-22-2014, 12:01 PM | #46 |
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Join Date: Mar 2014
Location: Vienna, Austria, Europe
Posts: 87
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Re: Rear main seal
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Once again, thanks to all for your helping input in this matter, for a newbie, who has just experience on V8/5Lit/twin turbo diesels at HP>390 these help was essential, thanks Albert
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