RDE-17 Crankshaft Needle Bearings 375763

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Buccaneer
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RDE-17 Crankshaft Needle Bearings 375763

Postby Buccaneer » Fri Jul 13, 2018 10:42 am

After I took out the upper crankshaft carbon seal, spring, etc.,
I noticed a little side play in the crankshaft.
Not sure if this thing is worth fixing up yet, as I haven't even
peeked at the pistons, but if it just needs a new needle bearing,
perhaps I'll forge ahead.
I was looking at the 375763 bearings, and in
some cases it appears they're just showing an outer "two piece"
shell with no rollers. Other's appear as a one piece with rollers / needles.
What's up with that?
Thanks.

FrankR
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Joined: Tue Mar 10, 2015 6:32 pm
Location: Florida

Re: RDE-17 Crankshaft Needle Bearings 375763

Postby FrankR » Fri Jul 13, 2018 11:28 am

Have no idea. It certainly needs rollers, which do not come out. It is normal to have miniscule side play, barely detectable. Hopefully, you do not see any rust. Roller bearings will die if run with zero clearance.

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Re: RDE-17 Crankshaft Needle Bearings 375763

Postby Buccaneer » Fri Jul 13, 2018 12:29 pm

I just pulled the bottom carbon seal and noted about
the same amount of side play on the crank there,
as the top. Not sure if OMC has a spec for side clearance,
and not sure how I'd measure it anyway.
I do have a mickey mouse magnetic base
and gauge for measuring "things", but
the aluminum block and magnets are no fun.

Also, when I removed the lower carbon seal assembly,
I see no large o-ring as the parts diagram shows.
Only the one in the carbon seal.
And I don't see where it would go, unless it's
around the needle bearing and must be crankcase must
be opened to see it???

The good news, I pulled the intake port covers,
no scoring on the pistons, and all the rings are free.
I can see one exhaust port via the bottom of the
motor, and the piston looks good there as well.

FrankR
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Joined: Tue Mar 10, 2015 6:32 pm
Location: Florida

Re: RDE-17 Crankshaft Needle Bearings 375763

Postby FrankR » Fri Jul 13, 2018 12:33 pm

OMC does not list any side play specs.

The o-ring is around the OD of the bearing, and no you can't see it.

I suspect you are ok.

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Re: RDE-17 Crankshaft Needle Bearings 375763

Postby Buccaneer » Fri Jul 13, 2018 5:05 pm

Thanks Frank!


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