---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Thu 08/15/13: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:13 AM - Hydraulic Lock Prevention (Walter Lannon) 2. 09:36 AM - Yak 50 Parts / Transport (Todd McCutchan) 3. 09:50 AM - Re: Hydraulic Lock Prevention (dabear) 4. 11:53 AM - Re: Hydraulic Lock Prevention (LawnDart) 5. 02:36 PM - Re: CJ Oil Cooler Drain - Can't Remove (keithmckinley) 6. 07:14 PM - Re: Hydraulic Lock Prevention (Joe Howse) 7. 10:51 PM - Re: Hydraulic Lock Prevention (Byron Fox) ________________________________ Message 1 _____________________________________ Time: 09:13:40 AM PST US From: "Walter Lannon" Subject: Yak-List: Hydraulic Lock Prevention Gentlemen; Would greatly appreciate your comments on this subject. Both the Huosai and M14P (and probably the whole Ivchenko series) are notoriously bad in this area. I have not been too keen on oil shut-off valves in the past but now am convinced it is necessary. Any suggestions on valve and systems to purchase? Is an auxiliary oil scavenge pump a necessity? Or will a standard post-flight scavenge run suffice given that oil from the tank will be closed off? Thanks; Walt ________________________________ Message 2 _____________________________________ Time: 09:36:13 AM PST US From: "Todd McCutchan" Subject: Yak-List: Yak 50 Parts / Transport I am looking for the following for the Yak 50: 1. Parts a. Gear box castings b. Ailerons (L &R) c. Wing ribs d. Rudder e. Wing tips (L & R) f. Gear legs 2. Transport (to fit inside a 26' box truck) a. "false" gear b. Fuselage cradle c. Wing cradle d. Horizontal / vertical stab cradle e. Elevator cradle I am also looking for recommended repair shops who may specialize in the Yak 50. Kind regards, Todd McCutchan Fast Aircraft T-34A - N134FA KDVT Hangar 42-06 Cell - 260.402.1740 Email: todd@fastaircraft.com Skype: tmccutchan Web: www.fastaircraft.com & www.toddmccutchanairshows.com ________________________________ Message 3 _____________________________________ Time: 09:50:10 AM PST US From: "dabear" Subject: RE: Yak-List: Hydraulic Lock Prevention I've used the system from Kevin Kimball for about 6 years. Yes, you need the shut off valve and the scavenge pump both. Even running up at 1800 rpm for a while doesn't get all the oil out. I've NEVER had a lock since the system has been installed (over 700 hours). I've had some oil in the exhaust/drain (very small amount). But never close enough to cause a problem Bear From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Walter Lannon Sent: Thursday, August 15, 2013 12:11 PM Subject: Yak-List: Hydraulic Lock Prevention Gentlemen; Would greatly appreciate your comments on this subject. Both the Huosai and M14P (and probably the whole Ivchenko series) are notoriously bad in this area. I have not been too keen on oil shut-off valves in the past but now am convinced it is necessary. Any suggestions on valve and systems to purchase? Is an auxiliary oil scavenge pump a necessity? Or will a standard post-flight scavenge run suffice given that oil from the tank will be closed off? Thanks; Walt ________________________________ Message 4 _____________________________________ Time: 11:53:01 AM PST US Subject: Yak-List: Re: Hydraulic Lock Prevention From: "LawnDart" I started years ago with no "add-on" system. I always do a quick post-flight scavenge run and I added an intake drain system several years back. Although this has reduced the number of locks to almost zero, they still happen occasionally (usually if the plane sits a while). I am convinced to reduce the odds further, I must do something about the sump filling (oil past the pump valve, etc.). I have a hose with fittings that I can connect to the sump drain (M14P) and open the valve and allow the oil to collect in a jug (all done with hand through the cowl flaps). I am working on replacing the stock sump valve with one that will be easier to actuate and have a semi-permanent line run to a convenient location low on the firewall for future. I am currently not interested in a shut-off valve or and electronic scavenge system. We'll see how it goes. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=406792#406792 ________________________________ Message 5 _____________________________________ Time: 02:36:57 PM PST US Subject: Yak-List: Re: CJ Oil Cooler Drain - Can't Remove From: "keithmckinley" Mike, 36mm socket (I believe). Don't eff it up with a crescent wrench! The 36mm also works on a the front sump screen and the oil screen just above the carb. Keith -------- Keith McKinley 700HS X26 Sebastian, FL Read this topic online here: http://forums.matronics.com/viewtopic.php?p=406806#406806 ________________________________ Message 6 _____________________________________ Time: 07:14:45 PM PST US From: "Joe Howse" Subject: Re: Yak-List: Hydraulic Lock Prevention Hi Walt My 2 cents worth We decided against the electric shut off attached to the oil tank as I know of several cases of the tank cracking with the weight of the valve and associated plumbing. I believe some owners have installed a mechanical gate valve and bowden cable with safety micro switch. Looks like best fix to me. We have a drain manifold installed with a drain valve when parked plus cans hanginging under the ex pipes. Carl Hayes engineered a better gravity check valve in the oil pump, we had him modify one for us but have not changed it yet. Only had one hyd. lock so far before attempting to start! I believe the cause was oil from the master rod with crank throw in the lowest position allowing oil to fill one of the bottom pistons then past the rings into the cylinder, removed a spark plug to drain, rare, but I am sure that is what happened, I was afraid to turn the prop without removing the spark plug. One owner I spoke to when parking long term, removes a top plug to make sure the master rod is a the top. I think Craig Payne has installed a window in the case for visibly checking rod pos.(I think one of the older engines with centrifuge port) How did you make out with your leaking prop Good to see you but too but you did not make Vandehoof Joe ________________________________ Message 7 _____________________________________ Time: 10:51:43 PM PST US Subject: Re: Yak-List: Hydraulic Lock Prevention From: Byron Fox I'm previously one of those with an electric valve that ultimately failed an d also cracked the oil tank because the valve hanging beneath the tank was i nsufficiently supported. Now have a mechanical ball valve mounted to the por t firewall. When the valve is open, it's red handle closes a micro switch wi red to the start switch. I must open the valve with my dumb hand before gett ing into the cockpit. Should my dumb hand forget, the engine won't start and a red light on the panel advises me of the dumb hand's error. It's worked f lawlessly since Vladimir installed it three years ago. Blitz Fox 415-307-2405 On Aug 15, 2013, at 7:09 PM, "Joe Howse" wrote: > > Hi Walt > My 2 cents worth > > We decided against the electric shut off attached to the oil tank as I kno w of several cases of the tank cracking with the weight of the valve > and associated plumbing. > I believe some owners have installed a mechanical gate valve and bowden c able with safety micro switch. Looks like best fix to me. > We have a drain manifold installed with a drain valve when parked plus can s hanginging under the ex pipes. > Carl Hayes engineered a better gravity check valve in the oil pump, we had him modify one for us but have not changed it yet. > Only had one hyd. lock so far before attempting to start! I believe the ca use was oil from the master rod with crank throw in the lowest > position allowing oil to fill one of the bottom pistons then past the ring s into the cylinder, removed a spark plug to drain, rare, but I am sure that is what happened, I was afraid to turn the prop without removing the spark p lug. > One owner I spoke to when parking long term, removes a top plug to make su re the master rod is a the top. > I think Craig Payne has installed a window in the case for visibly checkin g rod pos.(I think one of the older engines with centrifuge port) > > How did you make out with your leaking prop > > Good to see you but too but you did not make Vandehoof > > Joe > > > > > > > > > ========================== ========= ========================== ========= ========================== ========= ========================== ========= > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message yak-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Yak-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/yak-list Browse Digests http://www.matronics.com/digest/yak-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.