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Governor mounting stud question

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rleffler

Joined: 05 Nov 2006
Posts: 680

Posted: Wed Aug 20, 2014 3:22 pm Post subject: Governor mounting stud question

It's after Lycoming's support hours.   Does anyone know if the governor mounting studs on a io-540-d4a5 go through the case?



I have an oil leak coming out one of the mounting studs of my governor.    I've replaced the gasket several times, but the leak is persistent.



I was wondering if oil is coming through the stud mounting hole.   If it doesn't go through the case, then that would eliminate that potential cause.



Hartzell is recommending that I use oil as a release agent this time as oppose to installing the gasket dry.



Just attempting to determine whether or not it's a gasket failure or coming through the stud mounting hole.



Thanks,

Bob



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_________________
Bob Leffler
N410BL - Phase I
http://mykitlog.com/rleffler

flying-nut(at)cfl.rr.com
Guest

Posted: Wed Aug 20, 2014 3:46 pm Post subject: Governor mounting stud question

Well ..... The hole for the stud may have been drilled into the inside 

of the case, depending on which stud is leaking.  R&R the stud is an 

option, using Loctite as a sealer .....



You may have some luck drawing a little vacuum on the inside of the case 

... close off the vent and use the oil filler as a vacuum port .......

Clean around the stud and while you have the vacuum on, keep it wet with 

laquer thinner to draw some inside to 'clean' the oil out, and then use 

some green Loctite to seal it.



I've used the vacuum method on case leaks where the case halves meet.  

Mostly successes.



Linn

On 8/20/2014 7:21 PM, Bob Leffler wrote:

 	  Quote: 	
		   



 It's after Lycoming's support hours.   Does anyone know if the governor mounting studs on a io-540-d4a5 go through the case?



 I have an oil leak coming out one of the mounting studs of my governor.    I've replaced the gasket several times, but the leak is persistent.



 I was wondering if oil is coming through the stud mounting hole.   If it doesn't go through the case, then that would eliminate that potential cause.



 Hartzell is recommending that I use oil as a release agent this time as oppose to installing the gasket dry.



 Just attempting to determine whether or not it's a gasket failure or coming through the stud mounting hole.



 Thanks,

 Bob



 Sent from my iPad

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charliewaffles

Joined: 15 Mar 2011
Posts: 18

Posted: Wed Aug 20, 2014 6:14 pm Post subject: Re: Governor mounting stud question

I'm pretty sure the install instructions I had for the Hartzel Governor said to use a release agent - and NOT to do it dry. I believe they specify dow DC-4 compound.

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larkrv10(at)gmail.com
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Posted: Wed Aug 20, 2014 6:54 pm Post subject: Governor mounting stud question

Bob, my Lycoming had studs installed for a Hartzell governor, which I had changed out to fit the MT governor.  The engine builder told me the studs were a "friction" fit, and could possibly need heat to be removed. Didn't sound like locktite was needed.

 

I never asked whether the studs went all the way into the inner case but by the way he talked in our discussions, I feel they do not.

 

 Not much help but be careful if you try to remove that stud (hate to hear of one getting snapped off).

 

Rick

#40956

Southampton, Ont



 On Wed, Aug 20, 2014 at 7:21 PM, Bob Leffler <rv(at)thelefflers.com (rv(at)thelefflers.com)> wrote:

[quote] --> RV10-List message posted by: Bob Leffler <rv(at)thelefflers.com (rv(at)thelefflers.com)>

 

 It's after Lycoming's support hours.   Does anyone know if the governor mounting studs on a io-540-d4a5 go through the case?

 

 I have an oil leak coming out one of the mounting studs of my governor.    I've replaced the gasket several times, but the leak is persistent.

 

 I was wondering if oil is coming through the stud mounting hole.   If it doesn't go through the case, then that would eliminate that potential cause.

 

 Hartzell is recommending that I use oil as a release agent this time as oppose to installing the gasket dry.

 

 Just attempting to determine whether or not it's a gasket failure or coming through the stud mounting hole.

 

 Thanks,

 Bob

 

 Sent from my iPad

 

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rleffler

Joined: 05 Nov 2006
Posts: 680

Posted: Thu Aug 21, 2014 11:16 am Post subject: Re: Governor mounting stud question

Just as a follow to my question.   Per Lycoming, the studs do NOT go through the case.



bob

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Bob Leffler
N410BL - Phase I
http://mykitlog.com/rleffler

rv10pro(at)gmail.com
Guest

Posted: Thu Aug 21, 2014 11:44 am Post subject: Governor mounting stud question

To the age old question of lubricating valve cover gaskets.  I intentional left one au natural and the others got a combination of engine oil and DC4.  The Au Natural developed in immediate leak.  Lesson learned, lube with DC4 as recommended and DO NOT overtorque the gasket thinking you know better than the specs. 



Check those gaskets!

John



On Thu, Aug 21, 2014 at 12:16 PM, rleffler <rv(at)thelefflers.com (rv(at)thelefflers.com)> wrote:

 [quote]--> RV10-List message posted by: "rleffler" <rv(at)thelefflers.com (rv(at)thelefflers.com)>

  

 Just as a follow to my question.   Per Lycoming, the studs do NOT go through the case.

 

 bob

 

 --------

 Bob Leffler

 N410BL - Phase I

 http://mykitlog.com/rleffler

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=429016#429016

 

 

 

 

 

 

 

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