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Direct this to Lycoming also
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Lots of 150 HP 320's (Low CR) are still running at over 3500 hours. Lots of old 540's go well past 2000 hours, so I would deduct that this is either a soft bushing (Material) problem or a dimension (not enough press fit) problem, unless they had a design or process change. However until somebody presents more factual information as to the cause we are all in the dark. |
I have a YIO-360-M1B affected by the SB. Here are the results of my research so far. The ST-531 tool is not available in Aviall's system yet nor did they have a price as of this morning. The rep at Lycoming thought is would cost around $200 and he felt there should be plenty available. This tool is new and specially built just for this SB. The connecting rods that use the stretch bolts are not used in most of the engines we have, they are primarily used in the turbo charged and high compression engines ( per Lycoming rep ). Best I can tell they are not used in my engine. This means all I need is a torque wrench for the Connecting rod nuts. The top overhaul gasket kit P/N 05K22949 was not listed in Aviall's system. ( Aviall is Lycoming's largest distributor ) Aviall implied they would contact Lycoming to get it setup. I spoke to two people at Lycoming and no one would venture a guess as to how many defective bushings may be in service. I am going to purchase the ST-531 tool and can pass it on to someone else when I am finished.
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I spoke with someone at AERO yesterday. The ST-531 will be $216.00 + shipping and can be returned for a refund of $116.00 ($100.00 rental, essentially). However, as noted, it's not widely available. .... Just spoke with another distributor and they are also waiting on the tool.
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My con rods were reconditioned in June of 2015 BEFORE the bad batch shipped. Are you saying that previous bushings are defective also? Also, I'm very interested in knowing what the specific problem is, was it a materials issue or were they dimensionally incorrect? Tim |
bushings
The bushings are dimensionally incorrect! I have heard from a large shop that they had issues back on 2015 before the MSB and Lycoming did nothing.
Jesse |
Wow, I would think a competent machinist would check them first and even if he didn't he would notice they press in easier than they should.
I hope they don't expand the SB, so far I'm good by 5 months. Tim |
Tim, there are two problems at play here. The recent bushes from late 2015 were most likely but I can't confirm, to resolve issues that go back to around 2011 and who knows when else.
Strangely the new design that is subject to the MSB were still being shipped to customers down here in Feb this year. I am guessing this is not the end of it. |
Dear Folks Im very angry, we are building a RV-10 and the engine is in the original crate. It is affected by the SB and lycoming said that they will not change the engine. These is a very bad new and speaks bad of Lycoming responsability.
They said that we have to send the engine at our cost to a service station and open the NEW engine!! I always speak fine about lycoming engines but these case is inacceptable. |
We're at KOSH (drove). Our -M1B is likely on the list based on the time frame of the purchase. Bet the Lyc booth will be crowded. :mad:
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