crank seal question

smokie · Post by **smokie** » Mon Apr 06, 2009 1:21 pm

2 years ago I replaced a left outer crank seal on the 380. I took the dimensions off the old seal and got one from the local bearing shop. I just read on a previous post that the crank seals HAVE to have the flap on them so oil is channeled to the bearing. Am I asking for a melt down?

Post by **Suzsmokeyallan** » Mon Apr 06, 2009 1:54 pm

I hope im reading this correct,,,
Is this seal you are referring to the one you can see behind the LH engine cover??? if so, placing a standard type of oil seal there without the face raised sections will be fine since its rear open side is facing inwards to the main bearing.

smokie · Post by **smokie** » Mon Apr 06, 2009 4:25 pm

Correct, ill try to find that post I read earlier and see which seal they were talking about. If I remember right the old seal had the raised sections but I may be wrong.

Post by **Suzsmokeyallan** » Mon Apr 06, 2009 4:51 pm

The seals with the raised portions on the face are there to space it evenly off the bearings outer race on that side and to allow for space for the mixture to lubricate it. For the typical back facing installation against the bearing its not an issue.

H2RICK · Post by **H2RICK** » Mon Apr 13, 2009 5:52 pm

The L/H outboard crank bearing is the first to get lubrication from the pump's
crank injection line on that cylinder......so no worries about proper lubrication. The oil gets injected into the bearing from the outboard side and passes through the bearing toward the inboard side. The oil then gets picked up by the collector plate press fitted onto the outboard side of the crank flywheel and channelled into the big end rod bearing for that cylinder.
If you look here, you'll see it all quite easily.....
http://www.3cyl.com/~mraxl/gt/manuals/p ... piston.htm

As Allan mentions above, that outboard seal is a conventional seal WITHOUT any projections on it for "spacing" it from the bearing.