Lycoming SB 632 7/17/2017

[Sandrews]

I have a new Lycoming engine from Vans that is currently being built. Would I be correct to assume that my new currently being produced engine will not be affected?

[vic syracuse]

Originally Posted by Sandrews

I have a new Lycoming engine from Vans that is currently being built. Would I be correct to assume that my new currently being produced engine will not be affected?

I would think that is a safe bet. I have a Lycoming Thunderbolt that didn't make the list by about 2 weeks.

Vic

[TimO]

Interestingly, I just got off the phone with Lycoming because although my engine was shipped 12/2014, I still had the curiosity on the IO-390 being affected...it's not on the lists.

They told me that the IO-390 production never received any of the questionable parts, so the IO-390 is not affected.

I find it a bit strange because on some forum somewhere I did see that someone said that they had to have their IO-390 torn down for the SB. I don't know if they did that "just in case" or what, but according to Lycoming today, no IO-390 is affected at all. Strange but true or so I'm told.

[Caummisar]

I purchased a YIO-360-M1B last fall from Vans. Last night I got an email from Vans saying they believed I received an engine from Lycoming that is included in SB-632-b. Attached was a link to the SB ( https://www.lycoming.com/sites/default/files/SB632B%20Connecting%20Rod%20Identification.pdf )

I went to Table 1 in the SB and my EXACT engine model and serial number is listed on page 15. Following the instructions included in Van's email, I called Van's this morning. Lycoming indicates Vans is an "Authorized Distributor" and I should work through them.

Van's collected my information and is making arrangements to have the engine shipped back to Lycoming. Vans indicates the next step is to get authorization to return the engine and request a shipping crate. Shipping to be covered both ways. Vans says I'm the second builder they have worked with on this and that they are still learning the Lycoming process.

The engine has just barely been hung. I've made most of the connections and was starting to fit the cowl. Its never been started. Talk about taking the wind out of the building sails.

I'm taking this as just another hurdle to get over. First there was the recall for my heated Dynon pitot tube. Then the SB 14-01-31 for the inspection/repair of potential cracks the horizontal stab. It's all part of the build. I could have been worse....i.e. the big fan stopped with an off field landing. Maybe I should blame the Uncontrolled Airspace Podcast. I was listening to them talk about the SB in the shop right before I got the email. They Jinxed me. NOT!!

[mdaniell]

Originally Posted by Dustyone

Meanwhile ,down in Australia....

AWB 85-020 Issue 2 ? 9 August 2017

https://www.casa.gov.au/file/187126/...token=itziGCHn

I gather you need to have CASA login to use Ashley's link to this article, however I found another link which seems to be the latest version if any of you are interested. It also refers to engines around 2011.

https://casa.govcms.gov.au/files/awb...premature-wear

[ShookieRV7A]

Originally Posted by boom3

Big bummer. I'm always amazed when something like this comes up as the engines really haven't changed since the 50's.

Have they ever been perfect or does one SB eventually just create another down the road after material and or procedures change? I'm guessing it is always work in progress after looking at the 74 pages of Service Bulletins Letters and Instructions.

Wow, tough business...

Looks like it was a sub-contrator supplier problem...

"Lycoming has determined that a small percentage of the bushings manufactured by a sub-supplier during a specific time period were diametrically undersized, resulting in a tightness of fit below factory accepted tolerances.These non-conforming bushings may have a substantially lower push-in/pull-out force than conforming bushings and may be susceptible to unseating during normal engine operations."

[ctennis]

Replaced two connecting rods. Send everything back to the distributor including a detailed invoice for just over $3300. Let's see how smoothly my warranty refund goes.

The good news is airplane flew today for the first time with no issues.

What actually amazed me most was the fact that, in doing the inspection, Lycoming wanted the stamped lot number and serial number off of all of the installed connecting rods. However, the replacement rods I got have absolutely no lot or serial number on them. The SB even says this may be the case. What kind of quality control is this??

[bruceflys]

New YIO-540-D4A5, SN EL-36630-48E, bought through Van's, built July 2016, completely mounted, but not run on a RV-10 project. Connecting rods LW-11750 S from lots K476, K477, and K480. A&P, IA did the work in my shop. Bushings were tight on all six rods. Online survey completed.

Now the time has come to submit a warranty claim. Anyone know what shop rate Lycoming will reimburse? Will it pay for the tool and gasket kit?

I agree with ctennis that anonymous parts without identifying numbers is poor practice. How will anyone know if the parts are genuine? This disassembly was my first look into the guts of an engine and I was surprised the other way. It seemed everything, including components as small as a piston pin cap, had markings.

[rv7boy]

Mike Busch has an interesting blog entry about this SB/AD situation. Whether or not you like him, he has an interesting insight into how this AD developed.

[DanH]

Originally Posted by rv7boy

Mike Busch has an interesting blog entry about this SB/AD situation. Whether or not you like him, he has an interesting insight into how this AD developed.

The linked article about cylinder base and connecting rod bolt preload is worth reading. The short studs in particular offer some risk:

https://www.savvyaviation.com/wp-con...-be-afraid.pdf