Seals too tight on bottom end??

Wags

New Member
Aug 4, 2016
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Michigan
I'm rebuilding my bottom end. My crank spun perfect until I insalled the new seals. Now I have to use some pretty serious force to spin the crank. Is this normal? Please help.
 

Kioshk

Active Member
Oct 21, 2012
1,152
7
38
Connecticut
You've attributed the issue to your seals; is the crank isolated from the drive-train? Is the engine completely reassembled? Is the resistance continual or intermittent?
 

2door

Moderator
Staff member
Sep 15, 2008
16,326
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Littleton, Colorado
Something else is goin on. Crankshaft seals do not add that much rotational resistance.

Even if you didn't lubricate the seals while installing them, they wouldn't keep the crank from turning as much as you describe. Keep looking.

Tom
 

allen standley

Well-Known Member
Oct 22, 2011
1,118
218
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Bangor, Maine
Check shaft keys. If one has slipped too far back it will bind against that brand new seal.
I had this issue with a half round shaft key, kinda banana'ed up at the rear and bound up the rotation.
 

Wags

New Member
Aug 4, 2016
32
0
0
Michigan
I had the whole bottom end put together. I decided to take one thing off at a time until I found the problem. It wasn't until I I got to the drive side seal that the crank decided to spin like it was supposed to all along. Now I know and I learned something new today ...that seals can be pushed in too far. Thanks for everybody's time.
 

2door

Moderator
Staff member
Sep 15, 2008
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Littleton, Colorado
Not saying you're wrong but every engine I've seen has a shoulder machined into the case that the seal bottoms against. I've never seen one where the seal could be pressed in too deep. A seal with the wrong inside diameter, too small, could account for it however.

Tom