---------------------------------------------------------- RV10-List Digest Archive --- Total Messages Posted Sat 11/11/17: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 0. 07:36 AM - Make Sure You're Listed! List of Contributors Published in December! (Matt Dralle) 1. 10:24 AM - Unservicable bearing cups (David Saylor) 2. 03:17 PM - Re: Unservicable bearing cups (Tim Olson) 3. 04:41 PM - Re: Unservicable bearing cups (David Saylor) ________________________________ Message 0 _____________________________________ Time: 07:36:22 AM PST US From: Matt Dralle Subject: RV10-List: Make Sure You're Listed! List of Contributors Published in December! Dear Listers, The List of Contributors (LOC) is just around the corner! In December I post a list of everyone that so generously made a Contribution to support the Lists. Its my way of publicly thanking everyone that took a minute to show their appreciation for the Lists. Won't you take minute and assure that your name is on the upcoming LOC? Tell others that you appreciate the Lists. Making a Contribution to support the Lists is fast and easy using your Visa, MasterCard, or Paypal account: http://www.matronics.com/contribution Or, drop a personal check in the mail to: Matt Dralle / Matronics 581 Jeannie Way Livermore CA 94550 USA I would like to thank everyone that has so generously made a Contribution thus far during this year's List Fund Raiser! Remember that its YOUR support that keeps these Lists running and improving! Don't forget to include a little comment about how the Lists have helped you! Thank you! Matt Dralle Matronics Email List Administrator ________________________________ Message 1 _____________________________________ Time: 10:24:06 AM PST US From: David Saylor Subject: RV10-List: Unservicable bearing cups 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 ________________________________ Message 2 _____________________________________ Time: 03:17:43 PM PST US Subject: Re: RV10-List: Unservicable bearing cups From: Tim Olson 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 ________________________________ Message 3 _____________________________________ Time: 04:41:43 PM PST US From: David Saylor Subject: Re: RV10-List: Unservicable bearing cups Ya l think ya got it narrowed down there ;-). 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=99ve heard the rule of thumb is within 30 miles of salt water. But then it=99s lived at WVI since 2007 without any real corrosion anywhere to speak of. The marks aren=99t gonna polish out. They=99re significant. =94Dave On Sat, Nov 11, 2017 at 3:21 PM Tim Olson 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. > 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 weigh t > 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 > > =========== =========== =========== =========== =========== > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv10-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV10-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rv10-list Browse Digests http://www.matronics.com/digest/rv10-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.