N2652W will have a new home!

[hammdo]

Shipment #1 came in -- Millennium Cylinders, piston pins, alt belt.  Shipment 2 is delayed due to the snow storm but hopefully will be here on Monday or Tuesday.

The 4th cylinder etc. is already @ the shop since we thought it was the cylinder initially based on borescope.

-Don

[hammdo]

Whew, rest is finally in! Will be taking to shop tomorrow. Will get an idea of timeframe and if the shop needs anything else… She should be in much better shape after this. DLC lifters are nice…

-Don

[hammdo]

FYI, since the re-org of Superior, they have on shore manufacturing with their subsidiary:

https://superioraerospace.net/

I sent an email about where their products are now being machined (after the re-org) and Superior was kind enough to give me the details.

So Superior Aerospace does the manufacture and partial assemblies, while the Dallas (Coppell) Location does the rest.  I live a few miles from their Coppell location too ;o)

-Don

[Fly Boomer]

2 hours ago, hammdo said:

Whew, rest is finally in! Will be taking to shop tomorrow. Will get an idea of timeframe and if the shop needs anything else… She should be in much better shape after this. DLC lifters are nice…

-Don

[Echo]

Quite the saga. Hope all goes well for you Don. You deserve it.  Your positive mental attitude through this is very encouraging. Cheers for smooth running power plant. Scott 

[hammdo]

I was hoping something like this would have waited a bit longer. I’ve been saving for a big hit but it seems when I go off plan (like leather yokes or autopilot), that is when an event happens. IRAN will freshen things up. I’ve pretty much have done all the other Items as I went along (progressively trying to be ahead of maintenance where it makes sense).

I’m just glad I can do this much now. Bottom end should be good, basically new top end. If all goes well, I should still have leeway later to get the AeroCruze installed. Parts go to the shop tomorrow. The AP/IA doing the engine IRAN has decades of experience (semi-retired last year), has built 3 experimental aircraft (and is building one now), and offered to do this for me (5 years I’ve been going to them). The other AP/IA (who bought the other out) has lots of experience too - but likes to do avionics ;o).

Thanks for checking in!

-Don

[hammdo]

Parts dropped off, had a chance to speak to the APs.  They both agree that the lifters must have failed -- intake side. Exhaust showed no signs of issues -- just very odd but not surprising.

Engine is already off, AP is gonna mic the crank and if that is ok (which we don't see a reason why it wouldn't since we caught the metal very early), the IRAN will proceed.

She's naked:

 

[hammdo]

Tear down completed. Crank good, gonna freshen it up with new bearings, rod bolts, lifter plungers, 1 pushrod need’s replacing. Lower mount bushings need replacement. Goes to show things can happen even when maintenance is constantly being done.

We talked about doing the full OH but 3 to 6 months out and she won’t be hangered. I think just doing the IRAN is best for now. It will be as fresh as one can get.

-Don

 

[hammdo]

What they found on tear down:

Spalled lifters happen in the last 60 hours. Last year when we did the #4 cylinder, we saw nothing on the faces/cam.

821 hours since the last IRAN - this is the current condition. 

Basically, No NDI (non destructive inspection), and no crank polish/line boring will be done. 

-Don

 

[201Steve]

Maybe I’m mistaken, but the coloring of the tappets looks like DLC. I feel like the DLC’s are more black in color. I could be wrong on that… 

would be interesting to know for sure but it’s unclear to me when Lycoming started doing the DLC. 

[hammdo]

Those are the original ones from 1996 when it was a Lycoming factory overhaul. I looked at them and they are not DLC lifters. I also looked at the last IRAN (in 2006 from gear up) and they resurfaced those lifters/cam followers.

When I got the DLC lifters, you could tell the difference. My guess those are just dark from use. The faces are very light color vs the DLC one which are very dark/black faces.

-Don

[hammdo]

Here is a pic of the different types - original, DLC (Diamond Like Carbon), Rollers:

 

-Don

[DCarlton]

On 1/16/2025 at 2:21 PM, hammdo said:

What they found on tear down:

Spalled lifters happen in the last 60 hours. Last year when we did the #4 cylinder, we saw nothing on the faces/cam.

821 hours since the last IRAN - this is the current condition. 

Basically, No NDI (non destructive inspection), and no crank polish/line boring will be done. 

-Don

 

Spalling due to?   Corrosion?  

[hammdo]

No corrosion found. We checked the cam and lifters last year and nothing on them. My guess is these 4 just failed recently. I fly pretty much weekly, change the oils ~4 times a year so it’s not from that.

-Don