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Old 11-15-2016, 04:28 PM
cguarino cguarino is offline
Join Date: May 2005
Posts: 378
Default A couple of engine assembly questions

I'm finally about to reassemble my engine after a main bearing failure. I've read the service instructions but I want some advice from guys that do this regularly. My first question is what do you use to pre-lube the cam and lifters and the bearings when assembling the engine? Lycoming recommends lubricants that are near impossible to find. My second question is about the case sealant. Lycoming has approved 3 methods. Perfect Seal #4 and silk thread, Loctite 515 and RTV 102. Which one works the best? Thanks in advance for the help.
Charlie "T.Bear" Guarino
Springtown, TX
RV-4 Flying again with a fresh overhaul
Exempt but paid
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Old 11-15-2016, 05:22 PM
Kyle Boatright Kyle Boatright is offline
Join Date: Aug 2005
Location: Atlanta, GA
Posts: 4,459

Amazon, Aircraft Spruce, and Ebay are your friends in finding unusual lubricants. I don't remember any particular difficulties finding the Lycoming specified ones when I did my engine.

On the case, I used locktite without the silk thread, which has worked fine. I can't tell you if the other choices are better or worse. At that point, it is probably down to the skill or attention to detail of the assembler and the condition of the case halves rather than the specific sealant used.
Kyle Boatright
Marietta, GA
2001 RV-6 N46KB
2019(?) RV-10
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Old 11-15-2016, 05:46 PM
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Radomir Radomir is offline
Join Date: Jan 2005
Location: Charlotte, NC
Posts: 1,524

For cam lubrication I used US Lubricants Assembly Lube (one tube is plenty).. But you should be able to find Lubri-bond A (skygeek seems to sell, though in spray can??)... I'd stick to something that comes in a tube.. but that's just me

As mentioned, you should be able to source out everything fairly easily.. even that food-grade anti seize .. .need a small dab of it... you'll never use 99.999% of the can content again ..
RV-7A sold
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Old 11-15-2016, 08:30 PM
cajunwings cajunwings is offline
Join Date: Jun 2007
Location: new iberia la
Posts: 826
Default Lubes & Sealants

Aircraft Specialty Services in Tulsa supplies a little tube of cam assembly lube with their camshafts. I presume they would sell it outright. They should also be able to supply the silk thread. On the recommendation of one of the well known engine shops I've used Hylomar Aerograde (blue) sealant with the silk thread on several engines and have had great results.

Don Broussard A&P, IA

RV-9 Rebuild in Progress
Piper Pacer
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Old 11-16-2016, 10:25 AM
tim2542 tim2542 is offline
Join Date: Aug 2009
Location: Redding,Ca
Posts: 633

You can buy moly cam assembly lube at any auto parts store, there's nothing special about it, here's a NAPA p/n
SEP 55403B
Tim Andres
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Old 11-16-2016, 10:45 AM
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az_gila az_gila is offline
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011

Originally Posted by tim2542 View Post
You can buy moly cam assembly lube at any auto parts store, there's nothing special about it, here's a NAPA p/n
SEP 55403B
Tim Andres
And the Vantage Overhaul Manual simply calls out for "cam pre-lube" and states a "moly-graphite" one is preferred.

Just go to an auto parts store as Tim says...
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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Old 11-17-2016, 10:28 AM
Steve Steve is offline
Join Date: Jan 2005
Location: Roy, Utah
Posts: 1,189
Default A few hints and tips here:
Five Sierra Fox
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