Modern crank seals

Bob Johnson

Bob Johnson

Well-known member
I am rebuilding my Model B engine. It has modern seal at the front and rear of the crankshaft. Can anyone tell me which ones I have (see pictures) and where I can get new ones?

Bob
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I agree with James,
Comments regarding the use of the modern front seal: A lot of the new front pulleys are rough at the area the front seal mates to. A rough surface will quickly destroy the modern seal. Devise a mandrel to fit in a lathe or drill press to allow you to polish the pulley. The other thing to consider when installing the modern front seal is to get it centered around the pulley wear surface. This requires installing both the pan and front timing cover while the sealant you are using around the perimeter of the seal is still very pliable. I try to install them within 10 minutes of each other when using silicone. The first one I ever used failed due to not being centered. I installed the front cover on an engine and waited overnight to let the sealant set-up and then set the pan. This method pushed the seal off center and with a less than perfect surface on the pulley, it started leaking within 4 hours on the break-in stand. I've used over 40 of the modern front seals in the last couple years and only had that initial failure. The rest are all non-leakers! I have had one on my own engine for over 50,000 miles with no leaks.
Where to get the front seal: Mike's, Bratton's, Snyders....most of the rest have them.
Good Day!
Dave in MN
 
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Good comments by Dave in MN. For that reason I usually use the stock dog turd on the front. On B engines I like the 1-piece Burtz which requires a special "slinger".
 
For anyone replacing the front seal with the old original... I have always cut a widely spaced, light lefthand thread on the shaft area of the pulley. This tends to whip the oil back in if it tries to get out.
 
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