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Unservicable bearing cups

 
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Dave Saylor



Joined: 11 Jan 2015
Posts: 115
Location: GILROY, CA

PostPosted: Sat Nov 11, 2017 10:24 am    Post subject: Unservicable bearing cups Reply with quote

Here's a picture of some of the cups I just changed.  I change them when they have even just one of the marks on the inner surface.  So obviously these are toast.

My plane sat in 2016 from April to October.  I suspect that may have something to do with these marks.  I'll be paying closer attention next year.  All the bearings in both MLGs and one side of NLG were replaced.
The rollers had corresponding marks.
PNs for future reference:
MLG
Timken LM29749 Cone (the part with the rollers)
Timken LM29710 Cup (the part pressed into the wheel)
Add "20629" or "2-629" the end of the PN for FAA approved parts
NLG
Timken LM67000LA Cone
Timken LM67010 Cup
(as listed on the MATCO drawing)


--Dave


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KWVI
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Tim Olson



Joined: 25 Jan 2007
Posts: 2702

PostPosted: Sat Nov 11, 2017 3:17 pm    Post subject: Unservicable bearing cups Reply with quote

Thanks for posting the pics and part number recap for the people who want to
save this for future reference!

Those marks almost have to not be from USAGE wear, but from sitting wear.
Notice how they are only on 1/2 of the race...that seems to indicate,
in my non-expert opinion, that either that is the side that all the weight
was on, or that was the side that had not much weight and therefore
had enough of a gap that moisture got in.

I would think that these went bad strictly from sitting too long with
moisture around.  Was this still somewhat near the ocean?
I bet if you had flown regularly you wouldn't have seen this.

The unevenness of the marks also make me wonder if maybe the
bearings were just slightly loose.  That's just thinking out loud...not
that I'd advise you to do anything different.

Anyway, very interesting.  If you scotchbrite those marks, do they polish
off? I wonder how deep they go.
Tim

On 11/11/2017 12:21 PM, David Saylor wrote:
Quote:
Here's a picture of some of the cups I just changed.  I change them
when they have even just one of the marks on the inner surface.  So
obviously these are toast.

My plane sat in 2016 from April to October.  I suspect that may have
something to do with these marks.  I'll be paying closer attention
next year.  All the bearings in both MLGs and one side of NLG were
replaced.

The rollers had corresponding marks.

PNs for future reference:

MLG
Timken LM29749 Cone (the part with the rollers)
Timken LM29710 Cup (the part pressed into the wheel)
Add "20629" or "2-629" the end of the PN for FAA approved parts

NLG
Timken LM67000LA Cone
Timken LM67010 Cup
(as listed on the MATCO drawing)
--Dave


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Dave Saylor



Joined: 11 Jan 2015
Posts: 115
Location: GILROY, CA

PostPosted: Sat Nov 11, 2017 4:41 pm    Post subject: Unservicable bearing cups Reply with quote

Ya l think ya got it narrowed down there Wink
It was parked for engine work for spring/summer 2016. It sat in a hangar in San Jose, so probably less salt air than Watsonville but still maybe some.  I’ve heard the rule of thumb is within 30 miles of salt water. But then it’s lived at WVI since 2007 without any real corrosion anywhere to speak of.
The marks aren’t gonna polish out.  They’re significant.
—Dave

On Sat, Nov 11, 2017 at 3:21 PM Tim Olson <Tim(at)myrv10.com (Tim(at)myrv10.com)> wrote:

Quote:
--> RV10-List message posted by: Tim Olson <Tim(at)MyRV10.com>

Thanks for posting the pics and part number recap for the people who want to
save this for future reference!

Those marks almost have to not be from USAGE wear, but from sitting wear.
Notice how they are only on 1/2 of the race...that seems to indicate,
in my non-expert opinion, that either that is the side that all the weight
was on, or that was the side that had not much weight and therefore
had enough of a gap that moisture got in.

I would think that these went bad strictly from sitting too long with
moisture around.  Was this still somewhat near the ocean?
I bet if you had flown regularly you wouldn't have seen this.

The unevenness of the marks also make me wonder if maybe the
bearings were just slightly loose.  That's just thinking out loud..not
that I'd advise you to do anything different.

Anyway, very interesting.  If you scotchbrite those marks, do they polish
off? I wonder how deep they go.
Tim

On 11/11/2017 12:21 PM, David Saylor wrote:
> Here's a picture of some of the cups I just changed.  I change them
> when they have even just one of the marks on the inner surface.  So
> obviously these are toast.
>
> My plane sat in 2016 from April to October.  I suspect that may have
> something to do with these marks.  I'll be paying closer attention
> next year.  All the bearings in both MLGs and one side of NLG were
> replaced.
>
> The rollers had corresponding marks.
>
> PNs for future reference:
>
> MLG
> Timken LM29749 Cone (the part with the rollers)
> Timken LM29710 Cup (the part pressed into the wheel)
> Add "20629" or "2-629" the end of the PN for FAA approved parts
>
> NLG
> Timken LM67000LA Cone
> Timken LM67010 Cup
> (as listed on the MATCO drawing)
>
>
> --Dave


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KWVI
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philperry9



Joined: 23 Nov 2011
Posts: 330

PostPosted: Thu Nov 16, 2017 10:40 am    Post subject: Unservicable bearing cups Reply with quote

Dave,

Do you recall which grease you were using while the airplane set? Just curious as I’m getting ready to repack (hopefully not replace!) my bearings.
I’ve got Aeroshell 5 in them now. The supplied wheels and bearings from Cleveland had Mobil SHC 100 installed in them from the factory.
I’m wanting to look at the corrosion inhibitors in each available grease going forward.
Thanks,
Phil

Sent from my iPhone

On Nov 11, 2017, at 6:40 PM, David Saylor <saylor.dave(at)gmail.com (saylor.dave(at)gmail.com)> wrote:
Quote:
Ya l think ya got it narrowed down there Wink.
It was parked for engine work for spring/summer 2016. It sat in a hangar in San Jose, so probably less salt air than Watsonville but still maybe some. I’ve heard the rule of thumb is within 30 miles of salt water. But then it’s lived at WVI since 2007 without any real corrosion anywhere to speak of.
The marks aren’t gonna polish out. They’re significant.
—Dave

On Sat, Nov 11, 2017 at 3:21 PM Tim Olson <Tim(at)myrv10.com (Tim(at)myrv10.com)> wrote:

Quote:
--> RV10-List message posted by: Tim Olson <Tim(at)MyRV10.com (Tim(at)MyRV10.com)>

Thanks for posting the pics and part number recap for the people who want to
save this for future reference!

Those marks almost have to not be from USAGE wear, but from sitting wear.
Notice how they are only on 1/2 of the race...that seems to indicate,
in my non-expert opinion, that either that is the side that all the weight
was on, or that was the side that had not much weight and therefore
had enough of a gap that moisture got in.

I would think that these went bad strictly from sitting too long with
moisture around. Was this still somewhat near the ocean?
I bet if you had flown regularly you wouldn't have seen this.

The unevenness of the marks also make me wonder if maybe the
bearings were just slightly loose. That's just thinking out loud...not
that I'd advise you to do anything different.

Anyway, very interesting. If you scotchbrite those marks, do they polish
off? I wonder how deep they go.
Tim

On 11/11/2017 12:21 PM, David Saylor wrote:
> Here's a picture of some of the cups I just changed. I change them
> when they have even just one of the marks on the inner surface. So
> obviously these are toast.
>
> My plane sat in 2016 from April to October. I suspect that may have
> something to do with these marks. I'll be paying closer attention
> next year. All the bearings in both MLGs and one side of NLG were
> replaced.
>
> The rollers had corresponding marks.
>
> PNs for future reference:
>
> MLG
> Timken LM29749 Cone (the part with the rollers)
> Timken LM29710 Cup (the part pressed into the wheel)
> Add "20629" or "2-629" the end of the PN for FAA approved parts
>
> NLG
> Timken LM67000LA Cone
> Timken LM67010 Cup
> (as listed on the MATCO drawing)
>
>
> --Dave


===========
-List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?RV10-List
===========
FORUMS -
eferrer" target="_blank">http://forums.matronics.com
===========
WIKI -
errer" target="_blank">http://wiki.matronics.com
===========
b Site -
-Matt Dralle, List Admin.
rel="noreferrer" target="_blank">http://www.matronics.com/contribution
===========








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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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Dave Saylor



Joined: 11 Jan 2015
Posts: 115
Location: GILROY, CA

PostPosted: Thu Nov 16, 2017 8:22 pm    Post subject: Unservicable bearing cups Reply with quote

I had Shell 5 in the mains and SHC100 in the nose. The nose failed one of
the two. All the mains failed.

--Dave

On Thu, Nov 16, 2017 at 10:38 AM, Phillip Perry <philperry9(at)gmail.com>
wrote:

[quote] Dave,

Do you recall which grease you were using while the airplane set? Just
curious as I’m getting ready to repack (hopefully not replace!) my bearings.

I’ve got Aeroshell 5 in them now. The supplied wheels and bearings from
Cleveland had Mobil SHC 100 installed in them from the factory.

I’m wanting to look at the corrosion inhibitors in each available grease
going forward.

Thanks,
Phil

Sent from my iPhone

On Nov 11, 2017, at 6:40 PM, David Saylor <saylor.dave(at)gmail.com> wrote:

Ya l think ya got it narrowed down there Wink.

It was parked for engine work for spring/summer 2016. It sat in a hangar
in San Jose, so probably less salt air than Watsonville but still maybe
some. I’ve heard the rule of thumb is within 30 miles of salt water. But
then it’s lived at WVI since 2007 without any real corrosion anywhere to
speak of.

The marks aren’t gonna polish out. They’re significant.

—Dave

On Sat, Nov 11, 2017 at 3:21 PM Tim Olson <Tim(at)myrv10.com> wrote:

>
>
> Thanks for posting the pics and part number recap for the people who want
> to
> save this for future reference!
>
> Those marks almost have to not be from USAGE wear, but from sitting wear


- The Matronics RV10-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?RV10-List

_________________
--Dave
KWVI
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