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  #1  
Old 10-15-2018, 08:53 AM
Jmason Jmason is offline
 
Join Date: Jan 2017
Location: Enterprise AL
Posts: 16
Default How do I properly seat the #4 cylinder after I replace it?

I recently had to replace my #4 cylinder because the exhaust valve stuck and now I need to begging the process of breaking it in and seating the cylinder. Does anyone have any best practices and recommendations for me? I have heard that it can take anywhere from 4-35 hours for the cylinder to stat properly and for the temps to come back down. Looking for advice and recommendations.
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  #2  
Old 10-15-2018, 09:07 AM
Freemasm Freemasm is offline
 
Join Date: Nov 2017
Location: Orlando
Posts: 60
Default Ring Seating?

Assume you're talking about ring seating. Lycoming engine? Run mineral oil until oil consumption until stabilizes. Should be 5 to 50 hours IIRC, the SI. Keep ground operation to a minimum as excessive barrel heat will cause the oil to form a glaze on the cylinder wall. This will most assuredly prevent the rings from ever seating without cylinder removal, re-honing, etc. Best of luck, Sir.

Last edited by Freemasm : 10-15-2018 at 09:33 AM. Reason: typo
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  #3  
Old 10-15-2018, 09:26 AM
Robert Anglin Robert Anglin is offline
 
Join Date: Mar 2008
Location: houston, texas
Posts: 890
Default Just an old E.C.I. trick.

We learned from the guys at E.C.I. that they used Phillips 20-50 XC, I think it is in all their engines all the time. It is a mineral base for break-in and is used right through the break-in and on to full T.B.O.. We tried this on a few engines and found that it works just as advertised. I don't mined adding a quart of Aeroshell 100 from time to time while not breaking in a new cylinder and out on the road someplace wear the 20W-50 XC is not around. This may start a few to get upset but we have found the hard way that mixing a few quarts of different brands of oil has never hurt as long as it is good oil made to spec.
Just an idea for your thought. Yours, R.E.A. III # 80888
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  #4  
Old 10-15-2018, 10:23 AM
tim2542 tim2542 is offline
 
Join Date: Aug 2009
Location: Redding,Ca
Posts: 627
Default

I also have used Phillips XC/50 3 times now with good luck, break in and after, but Iíd go with the mfr or rebuilder recommendation to preserve any warrenty. The basic rules are keep ground runs to a minimum, fly at lower altitudes and keep the power up around 75%, and whatever you do keep the chtís down. Glazing canít happen under 400, maybe higher but try and keep it under that. Keep in mind we instrument the top of the cylinder, so we donít know the barrel temps. My opinion the break in is mostly over by first flight, but follow the rules for at least 10-15 hrs.
Good luck
Tim Andres
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  #5  
Old 10-15-2018, 02:26 PM
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n18pf n18pf is offline
 
Join Date: Mar 2006
Posts: 46
Default Welcome to the club

I just replaced all 4 of my cylinders - first flight was today. I used Millennium cylinders so I am following their instructions at the bottom of this page:
http://www.superiorairparts.com/millennium-cylinders/

Good luck with yours. I flew for 1.5 hours and have pretty good CHT numbers, but I'm going to continue with their procedure for another 5-10 hours.

I'm using Phillips Type M mineral oil for the first 25 hours or so, then I'll switch back to XC.
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  #6  
Old 10-15-2018, 02:55 PM
lr172 lr172 is offline
 
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Quote:
Originally Posted by n18pf View Post
I just replaced all 4 of my cylinders - first flight was today. I used Millennium cylinders so I am following their instructions at the bottom of this page:
http://www.superiorairparts.com/millennium-cylinders/

Good luck with yours. I flew for 1.5 hours and have pretty good CHT numbers, but I'm going to continue with their procedure for another 5-10 hours.

I'm using Phillips Type M mineral oil for the first 25 hours or so, then I'll switch back to XC.
Did you see a drop in CHTs/? If so, how long into your flight?

Larry
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  #7  
Old 10-15-2018, 04:24 PM
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n18pf n18pf is offline
 
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Default CHT drop

I noticed some drop within the first hour, but I don't have any hard data for you. I forgot my laptop (duh!), so I haven't had a chance to download the data from the engine monitor. I'll try to get it done tomorrow and let you know. Sorry!
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  #8  
Old 10-16-2018, 01:38 PM
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n18pf n18pf is offline
 
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Default Got some data

I pulled the data from my Dynon and plotted CHTs over time. It took a while to filter out the unneeded data, but I finally got down to the flight I was interested in.

I saw a temperature drop in all 4 CHTs within 15 minutes of about 25 degrees. It didn't seem to last long because they all pretty quickly recovered to the 360 degree range (no change in MP or RPM). I saw another small drop about 50 minutes into the flight of about 5 degrees. But overall, after about 20 minutes everything seemed to be fairly stable.

The whole flight only lasted about 1.5 hours, so I don't know if that is enough time to really draw any conclusions. I intend to continue the break-in process for another 10-20 hours. But right now I am very happy with the temperatures I have!

I hope that helps.
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  #9  
Old 10-16-2018, 05:51 PM
Jmason Jmason is offline
 
Join Date: Jan 2017
Location: Enterprise AL
Posts: 16
Default

This is great information. I am 20+ hours into the replacement of the #4 Cyl and i'm still in the 410 range. I have a feeling that it glazed over. I overhauled the original cyl so i'm thinking about putting it back on and trying it again. Thanks for all the advice.
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  #10  
Old 10-16-2018, 10:32 PM
lr172 lr172 is offline
 
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Location: Schaumburg, IL
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Quote:
Originally Posted by n18pf View Post
I pulled the data from my Dynon and plotted CHTs over time. It took a while to filter out the unneeded data, but I finally got down to the flight I was interested in.

I saw a temperature drop in all 4 CHTs within 15 minutes of about 25 degrees. It didn't seem to last long because they all pretty quickly recovered to the 360 degree range (no change in MP or RPM). I saw another small drop about 50 minutes into the flight of about 5 degrees. But overall, after about 20 minutes everything seemed to be fairly stable.

The whole flight only lasted about 1.5 hours, so I don't know if that is enough time to really draw any conclusions. I intend to continue the break-in process for another 10-20 hours. But right now I am very happy with the temperatures I have!

I hope that helps.
Thanks so much for digging that up. I am using Superior cyl's on my 540 build, in part due to the plateau honing and quick break in. I will be breaking in on the ground with a cooling shroud and was trying to gauge how much time I need for good ring seating.

Larry
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