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CS Crankshaft end - what's it look like

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recapen(at)earthlink.net
Guest

Posted: Fri Sep 01, 2006 7:47 am Post subject: CS Crankshaft end - what's it look like

Reposting since my original post failed to make it......



Fellow listers,



I'm trying to determine what the prop end of the crankshaft is supposed to look

like when it is set up for a constant speed prop.



Folks have written about plugs - but that doesn't tell me what to look for. 

If it's plugged, should I only see the plug?  If it's not plugged, what 

does the inside look like?



FWIW, I'm not seeing 'just a plug' - I'm seeing stuff in there -

looks like a bar going across with a notch cut in to it...maybe to allow a tool 

to get all the way in to the back.



Anyone have any drawings or photographs?



I know this is one that I don't want to have the wrong way...



Thanks,

Ralph Capen

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Tim(at)MyRV10.com
Guest

Posted: Fri Sep 01, 2006 8:13 am Post subject: CS Crankshaft end - what's it look like

Hey Ralph,



The crankshaft has the large flange, maybe 6-8" but in the

center is about a 1.5" hole, or something bigger than an inch

I think.  When they ship the engine then, they send it with

a plastic plug in the hole.   I'm not sure what you do

if you are not using a C/S prop, but my guess is they'd

probably have some more permanent cap that gets put in.

I've never looked real far inside, but I think you'll

just see a big hole, that goes way in, right in the

dead center.  I'm no expert...the only one I've ever

seen is my own.



Someone else may have to explain the bar and notch thing.

It may be that yours is just fine.  I wish I could offer

you more info.



Tim Olson - RV-10 N104CD - Flying

do not archive

Ralph E. Capen wrote:

 	  Quote: 	
		   

 

 Reposting since my original post failed to make it......

 

 Fellow listers,

 

 I'm trying to determine what the prop end of the crankshaft is supposed to look

 like when it is set up for a constant speed prop.

 

 Folks have written about plugs - but that doesn't tell me what to look for. 

 If it's plugged, should I only see the plug?  If it's not plugged, what 

 does the inside look like?

 

 FWIW, I'm not seeing 'just a plug' - I'm seeing stuff in there -

 looks like a bar going across with a notch cut in to it...maybe to allow a tool 

 to get all the way in to the back.

 

 Anyone have any drawings or photographs?

 

 I know this is one that I don't want to have the wrong way...

 

 Thanks,

 Ralph Capen

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KBelue(at)drs-tem.com
Guest

Posted: Fri Sep 01, 2006 9:57 am Post subject: CS Crankshaft end - what's it look like

Ralph,  

   

I am not an A&P, but this is based on experience:  

   

Hollow Lycoming cranks have two plug locations.   

   

If a fixed-pitch prop is used, then a ~ 1.910" plug (Expansion Plug STD-1211) goes in the end of the crank opening with no plug in the back of the crank opening. The front plug is convex and is installed by tapping with a hammer so that it tightens in the hole as it expands.   

   

If a constant-speed prop is used, the front plug is not installed but there is a smaller plug installed deep in the back of the crank opening, behind the cross-tube. This plug can be difficult to install because the cross tube must not be damaged. I believe the cross tube is where the pressurized oil from the governor gets to the prop.  

   

Some rear plugs have a setscrew-type plug in them so you don't have to remove the whole plug, just the setscrew when you are using a fixed-pitch prop.  

   

The front and rear plug should not be installed at the same time, else the oil pressure can build up and blow out the front plug, loosing a lot of oil.  

   

Since you see the cross tube, it is setup for a constant-speed prop if the rear plug is installed.  

   

I've included a cross-section picture of the crank in this email, but if does not appear you can see it in: Service Bulletin 505B.  

   

Kevin D. Belue  

RV6A ~700 hrs.  

RV10 finish kit  

   

   

[img]cid:image002.gif(at)01C6CDC5.A6AE4CD0[/img]  

   

   

[quote] --

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rickgray(at)adelphia.net
Guest

Posted: Fri Sep 01, 2006 10:18 am Post subject: CS Crankshaft end - what's it look like

Correct on 'most' of this.

Clarification: the 'crossover' tube is NOT where the oil from the govenor enters the crank.....that oil is introduced forward of the crossover tube.....you can see the hole if you look inside of the crank (if it's set up for C/S). The crossover tube, also called a 'slinger' tube or a 'sludge' tube is where oil that seeps through the large front bearing #1/#2 ends up. The tube is slightly off center....the oil enters from both ends of the tube from the surrounding bearing and is eventually thrown out of the CENTER of the tube where centrifugal force will throw any impurities to the inner sidewall of the hollow crankshaft....and the oil will run back down the shaft into the sump. If/when you remove a prop for conversion or whatever you'll typically see a buildup of sludge in this area....don't be alarmed.....just make a little 'hoe' out of some soft .020 and drag it out then clean things up.



Hope this helps.



Rick in Ohio at the Buffalo Farm - Ohio Valley RVators - too many RV's to list

http://rv6rick.tripod.com/ohiovalleyrvators/

[quote] 

 Ralph,

 

  

 

 I am not an A&P, but this is based on experience:

 

  

 

 Hollow Lycoming cranks have two plug locations. 

 

  

 

 If a fixed-pitch prop is used, then a ~ 1.910" plug (Expansion Plug

 STD-1211) goes in the end of the crank opening with no plug in the back of

 the crank opening. The front plug is convex and is installed by tapping with

 a hammer so that it tightens in the hole as it expands. 

 

  

 

 If a constant-speed prop is used, the front plug is not installed but there

 is a smaller plug installed deep in the back of the crank opening, behind

 the cross-tube. This plug can be difficult to install because the cross tube

 must not be damaged. I believe the cross tube is where the pressurized oil

 from the governor gets to the prop.

 

  

 

 Some rear plugs have a setscrew-type plug in them so you don't have to

 remove the whole plug, just the setscrew when you are using a fixed-pitch

 prop.

 

  

 

 The front and rear plug should not be installed at the same time, else the

 oil pressure can build up and blow out the front plug, loosing a lot of oil.

 

  

 

 Since you see the cross tube, it is setup for a constant-speed prop if the

 rear plug is installed.

 

  

 

 I've included a cross-section picture of the crank in this email, but if

 does not appear you can see it in: Service Bulletin 505B.

 

  

 

 Kevin D. Belue

 

 RV6A ~700 hrs.

 

 RV10 finish kit

 

  

 

  

 

 

 

  

 

  

 

 > --

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recapen(at)earthlink.net
Guest

Posted: Fri Sep 01, 2006 10:37 am Post subject: CS Crankshaft end - what's it look like

Thanks Kevin!



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recapen(at)earthlink.net
Guest

Posted: Fri Sep 01, 2006 10:42 am Post subject: CS Crankshaft end - what's it look like

Thanks Rick!



--

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