MooneyBob Posted March 12, 2017 Report Posted March 12, 2017 I have read and hear from different sources recently that the Phillips X/C 20W50 oil is recommended for the overhauled engine break in. I know that straight mineral oil is way to go but I would like to hear some opinions. Thanks
Guest Posted March 12, 2017 Report Posted March 12, 2017 Here is what Lycoming says, https://www.lycoming.com/sites/default/files/Lycoming Reciprocating engine Break-In and Oil Consumption.pdf Clarence
Andy95W Posted March 12, 2017 Report Posted March 12, 2017 https://www.lycoming.com/sites/default/files/Lubricating Oil Recommendations.pdf
jetdriven Posted March 12, 2017 Report Posted March 12, 2017 I used Philips X/C 20W50 type M. It's non detergent oil that satisfies Lycoming requirements. 1
kortopates Posted March 12, 2017 Report Posted March 12, 2017 If you have any kind of warranty from the engine or cylinder overhauler, their opinion is the only one that matters. Sent from my iPhone using Tapatalk
DXB Posted March 12, 2017 Report Posted March 12, 2017 Agree must go with the overhauler. It's interesting to note however that a very good engine shop thinks Phillips 20/50 XC is just fine: http://www.zephyrengines.com/breakin.pdf I got zero guidance from my shop after rehoning two cylinders and used Phillips 20/50 XC without issue - oil consumption stablized to <1qt/10hrs within the first 5 hrs.
BDPetersen Posted March 12, 2017 Report Posted March 12, 2017 Wish I could recall the oil guru who long ago advocated Philips X-C for break in. Advantage being viscosity on start up and keeping bad stuff in suspension in the process. I've run in a number of Continental cylinders on it with good results.
aaronk25 Posted March 12, 2017 Report Posted March 12, 2017 I think the issue with using a mineral oil is it accelerates wear on high pressure surfaces with little or no extra saftey factor such as cam to lifters. Sure it debatably may help set the rings faster but there are parts that can't tolerate the extra wear. But I broke in my cylinders running LOP and with 20w-50w standard Phillips x/c oil so what do I know. 1 qt in first 15 hours of consumption ain't bad though.Sent from my iPhone using Tapatalk
xcrmckenna Posted March 17, 2017 Report Posted March 17, 2017 Aaron , and DXB are you still running the Phillips 20w-50 in your planes after break in? My plane has a new cylinder and that is what they put in it. I was told the Phillips is good for the life of the engine?
DXB Posted March 17, 2017 Report Posted March 17, 2017 2 minutes ago, xcrmckenna said: Aaron , and DXB are you still running the Phillips 20w-50 in your planes after break in? My plane has a new cylinder and that is what they put in it. I was told the Phillips is good for the life of the engine? I am still running 20w50 XC. Will add camguard at next oil change - not good for initial breakin. I run Aeroshell W100 plus camguard in the summer 1
aaronk25 Posted March 17, 2017 Report Posted March 17, 2017 I'm still running same oil. Added cam guard at about 10 hours.Sent from my iPhone using Tapatalk
Bravoman Posted March 17, 2017 Report Posted March 17, 2017 For Lycoming turbocharged engines the use of AD ( ashless dispersent) oil, such as the above referenced Phillips, is required. Mineral oil is ok for non turbo set ups. 1
ArtVandelay Posted March 17, 2017 Report Posted March 17, 2017 So if you replace just 1 cylinder, how do you break in one without accelerating wear on everything else?
Bravoman Posted March 18, 2017 Report Posted March 18, 2017 22 hours ago, teejayevans said: So if you replace just 1 cylinder, how do you break in one without accelerating wear on everything else? Shouldn't use camguard or the like because anti scuff agents as I understand it prevent rings from seating. Just use correct oil for break in for the type of engine in question and run hard. Will not hurt the other cylinders since these engines are made to run high % power all day. As Anthony says, this is just the understanding of a pp as I am definitely no mechanic! regards, Frank 2
StevenL757 Posted March 18, 2017 Report Posted March 18, 2017 1 hour ago, Bravoman said: Shouldn't use camguard or the like because anti scuff agents as I understand it prevent rings from seating. Just use correct oil for break in for the type of engine in question and run hard. Will not hurt the other cylinders since these engines are made to run high % power all day. As Anthony says, this is just the understanding of a pp as I am definitely no mechanic! regards, Frank Exactly right.
PTK Posted March 18, 2017 Report Posted March 18, 2017 Here's some authoritative advice on the subject of break-in... http://www.shell.com/business-customers/aviation/aeroshell/knowledge-centre/technical-talk/techart08-30071255.html 1
slowflyin Posted March 18, 2017 Report Posted March 18, 2017 Last top end I used Phillips 20/50 XC with excellent results. Started adding cam guard after the rings were fully seated. Very low consumption during break in and very low now.
Jsavage3 Posted March 18, 2017 Report Posted March 18, 2017 On 3/16/2017 at 11:31 PM, DXB said: Will add camguard at next oil change - not good for initial breakin. I've heard this before too, but thus far just a rumor. Is there any definitive Camguard info out there that would explain the reasons why Camguard shouldn't be used during break-in? My situation is I just replaced two cylinders with new ones due to low compression on my turbo Continental -MB engine. The other four cylinders have compressions in the low 70s with about 400 hours SMOH. So, I'll be doing the break-in with Phillips XC 20W50 and wishing I could add Camguard during this break-in period to protect the rest of the engine while the two new ones get broke-in... Thoughts?
jetdriven Posted March 18, 2017 Report Posted March 18, 2017 maybe it increases the risk of bore polishing during break in.. you want friction there from ring debris. even the inventor of camguard recommends using it after break in is complete. maybe do a couple long flights, then add the camguard after the break-in is complete
Jsavage3 Posted March 18, 2017 Report Posted March 18, 2017 That's a good idea! I like that. I went back and read the "Engine Break-in" article found earlier in this thread and it was quite helpful as well...
DXB Posted March 18, 2017 Report Posted March 18, 2017 46 minutes ago, Jsavage3 said: I've heard this before too, but thus far just a rumor. Is there any definitive Camguard info out there that would explain the reasons why Camguard shouldn't be used during break-in? My situation is I just replaced two cylinders with new ones due to low compression on my turbo Continental -MB engine. The other four cylinders have compressions in the low 70s with about 400 hours SMOH. So, I'll be doing the break-in with Phillips XC 20W50 and wishing I could add Camguard during this break-in period to protect the rest of the engine while the two new ones get broke-in... Thoughts? Camguard manufacturer specifically recommends not using for breakin because of anti-scuff additives 1
aaronk25 Posted March 19, 2017 Report Posted March 19, 2017 A good way to cause a pre-mature cam failure is when overhauling or replacing one cylinder is to run straight mineral oil in a attempt to break in the cylinder. Normal 20w-50w Phillips for break in. Sent from my iPhone using Tapatalk
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