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Crank Seal?



 
 
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  #1  
Old November 10th 03, 02:57 AM
Mark S Conway
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Default Crank Seal?

What would cause a crank seal to leak?
Seal got replaced, and 15 hrs later, started leaking again.

Any thoughts?

Thanks


  #2  
Old November 10th 03, 03:22 AM
Stu Gotts
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Improper installation, dirt, scoring of the surface, misalignment of
the cases.

On Mon, 10 Nov 2003 01:57:28 GMT, "Mark S Conway"
wrote:

What would cause a crank seal to leak?
Seal got replaced, and 15 hrs later, started leaking again.

Any thoughts?

Thanks


  #3  
Old November 10th 03, 04:03 AM
Larry Smith
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"Mark S Conway" wrote in message
news:cgCrb.157136$Tr4.422856@attbi_s03...
What would cause a crank seal to leak?
Seal got replaced, and 15 hrs later, started leaking again.

Any thoughts?

Thanks



I don't know about Lycoming but Continental has an old service letter, iirc,
for lightly sanding the crank where the seal fits with something like 320
grit at about a 30 degree pitch. I've seen it done at 45. Oil is "screwed"
thereby back into the crankcase, as the crank turns. I rebuilt an engine
which had this problem and it leaked copiously around the new seal. The
crank had a little wear and scoring from the old seal, but the tiny "mill"
marks solved the problem. No more leak. This should be done by a pro,
natcherly. And, of course, the pitch must be like your prop's. If it's in
the wrong direction you screw the oil out onto the nose and aggravate the
problem.


  #4  
Old November 10th 03, 05:29 AM
G.R. Patterson III
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Mark S Conway wrote:

What would cause a crank seal to leak?
Seal got replaced, and 15 hrs later, started leaking again.


Check for a blocked crankcase ventilation tube.

George Patterson
If you're not part of the solution, you can make a lot of money prolonging
the problem.
 




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