Crankcase front seal leaking

Tiny
JHELMS1955
  • MEMBER
  • 2007 GMC SIERRA
  • 4.3L
  • V6
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
I had the front seal on the crankcase replace about twelve months ago and it started leaking again. The auto shop where I had the work done told me my motor bearings were probably going bad and caused a wobble that probably caused the seal to start leaking again. Is this a possibility or is he giving me a bunch of BS?
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Wednesday, December 12th, 2018 AT 2:44 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

No, he is on point.

When the main bearings wear, the crankshaft will move up and down a little and that movement will cause the seal to leak.

Before we assume this, ask him to check the surface of the crank where the seal rides. If it is worn, then the seal will leak. It can be repaired by using a seal with what is called a speedy sleeve. It creates a new surface for the seal to ride on.

Roy
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Wednesday, December 12th, 2018 AT 4:33 PM

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