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cjpilot710(at)aol.com
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 Posted: Tue Sep 10, 2013 5:44 pm Post subject: Hydraulic Lock Prevention |
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Bill,
All you have to do to prevent a hydraulic lock is take out the spark plugs. That leaves a VERY BIG HOLE, that the oil can flow though. And you really only need to do it on the bottom cylinders.
Also taking off the valve covers will NOT cause a hydraulic lock. One. there is not enough oil in the covers. Two. the oil will not flow into the cylinder, it simply falls on the floor OR a bucket/pan. All the valve covers in total would not have more than quart in them.
Do not worry about the oil pump ball valve or seat. Simply drain all the oil from the oil tank (you're changing it anyway). Also you'll be taking all 4 oil screens out to check and clean, so the engine will be draining oil anyway.
If you don't have a A&P license and have done this before, PLEASE get a qualified guy to do it for you and watch.
Jim "Pappy" Goolsby
In a message dated 9/10/2013 8:32:36 P.M. Eastern Daylight Time, bwade154(at)yahoo.com writes:
| Quote: | Hi guys and gals I'm doing my condition inspection now and on the to do list is adjust the valves well after draining all the oil and removing the oil hoses let drip a couple days time for the valves remove the covers and another quart or two of oil from the lower cylinders valve covers. So my question is how do you know if its the oil pump ball seat or a valve guide that's not quite up to par creating the hydraulic lock?. All this talk about ball valves after the oil tank and before the oil pump maybe we need to get the oil out of the push rod tubes? Has anyone put a drain tube on the valve covers and if so the results?
Bill Wade
N4450Y
From: Michael B. Cavanagh <mikecavanagh1(at)hotmail.com>
To: yak-list(at)matronics.com
Sent: Tuesday, September 10, 2013 7:05 PM
Subject: Re: Yak-List: Re: Hydraulic Lock Prevention
--> Yak-List message posted by: "Michael B. Cavanagh" <mikecavanagh1(at)hotmail.com (mikecavanagh1(at)hotmail.com)>
LOOKS REALLY NICE! I PUT A BALL VALVE ON MY RYAN STA YEARS AGO WHICH WORKED WELL. I WAS LUCKY THE OIL LINE WAS LOCATED IN A POSITION WHERE THE BALL VALVE CONTROL HANDLE WAS ACCESSED AT THE REAR OF THE COWLING. IN THE OFF POSITION THE HANDLE STUCK OUT IN PLAIN SIGHT, AND I ATTACHED A RED STREAMER TO IT AS AN ADDED PRECAUTION. I KNOW ANOTHER GUY WHO DID THE SAME THING BUT HAD A DOOR IN THE COWLING WHICH COULD NOT BE CLOSED WITH THE VALVE CLOSED. (CONTROL HANDLE STICKING OUT) YOURS LOOKS VERY NICE. MIKE
On Sep 10, 2013, at 2:04 PM, Vic <vicmolnar(at)aol.com (vicmolnar(at)aol.com)> wrote:
| Quote: | --> Yak-List message posted by: "Vic" <vicmolnar(at)aol.com (vicmolnar(at)aol.com)>
Wot, no comments - still ??
Please understand, I don´t sell any sets but wanted to share my idea with those who like the purely mechanical way. So feel free to include this idea of unlocking the oil valve from the fuel shut-off by Bowden cable in your own design that may look quite differently. But then, you will need some metal working facilities......
Cheers
Vic
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=408376#408376
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mikecavanagh1(at)hotmail.
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| Posted: Tue Sep 10, 2013 6:40 pm Post subject: Hydraulic Lock Prevention |
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I BELIEVE THE LATE LES CROWDER HAD VALVE COVER DRAINS, AN OIL SHUTOFF VALVE, AN ELECTRIC POST SHUTDOWN SCAVENGE PUMP. AND INTAKE DRAINS. WORKED GOOD. LOTS OF WORK.
On Sep 10, 2013, at 7:29 PM, bill wade <bwade154(at)yahoo.com (bwade154(at)yahoo.com)> wrote:
[quote]Hi guys and gals I'm doing my condition inspection now and on the to do list is adjust the valves well after draining all the oil and removing the oil hoses let drip a couple days time for the valves remove the covers and another quart or two of oil from the lower cylinders valve covers. So my question is how do you know if its the oil pump ball seat or a valve guide that's not quite up to par creating the hydraulic lock?. All this talk about ball valves after the oil tank and before the oil pump maybe we need to get the oil out of the push rod tubes? Has anyone put a drain tube on the valve covers and if so the results?
Bill Wade
N4450Y
From: Michael B. Cavanagh <mikecavanagh1(at)hotmail.com (mikecavanagh1(at)hotmail.com)>
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Sent: Tuesday, September 10, 2013 7:05 PM
Subject: Re: Re: Hydraulic Lock Prevention
--> Yak-List message posted by: "Michael B. Cavanagh" <mikecavanagh1(at)hotmail.com (mikecavanagh1(at)hotmail.com)>
LOOKS REALLY NICE! I PUT A BALL VALVE ON MY RYAN STA YEARS AGO WHICH WORKED WELL. I WAS LUCKY THE OIL LINE WAS LOCATED IN A POSITION WHERE THE BALL VALVE CONTROL HANDLE WAS ACCESSED AT THE REAR OF THE COWLING. IN THE OFF POSITION THE HANDLE STUCK OUT IN PLAIN SIGHT, AND I ATTACHED A RED STREAMER TO IT AS AN ADDED PRECAUTION. I KNOW ANOTHER GUY WHO DID THE SAME THING BUT HAD A DOOR IN THE COWLING WHICH COULD NOT BE CLOSED WITH THE VALVE CLOSED. (CONTROL HANDLE STICKING OUT) YOURS LOOKS VERY NICE. MIKE
On Sep 10, 2013, at 2:04 PM, Vic <vicmolnar(at)aol.com (vicmolnar(at)aol.com)> wrote:
| Quote: | --> Yak-List message posted by: "Vic" <vicmolnar(at)aol.com (vicmolnar(at)aol.com)>
Wot, no comments - still ??
Please understand, I don´t sell any sets but wanted to share my idea with those who like the purely mechanical way. So feel free to include this idea of unlocking the oil valve from the fuel shut-off by Bowden cable in your own design that may look quite differently. But then, you will need some metal working facilities......
Cheers
Vic
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=408376#408376
t;
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mark.bitterlich(at)navy.m
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| Posted: Thu Sep 12, 2013 10:03 am Post subject: Hydraulic Lock Prevention |
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I own Les Crowder's test aircraft, and it had the valve cover drains and scavenge pump. It had (and I still have stored) new valve covers that allowed drainage and then subsequent pumping back to the oil tank. It did work well, however it added a lot of hoses and clamps that increased the chances for an oil leak that would not be visible from the cockpit, so I removed all of it and went back to stock. It did not include an oil shut off valve.
His hydraulic toe brake conversation using Cleveland wheels and brakes was SUPERB and are still in use.
Mark
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mark.bitterlich(at)navy.m
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| Posted: Thu Sep 12, 2013 10:08 am Post subject: Hydraulic Lock Prevention |
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Les Crowder's modification included specially made valve covers that had hose outlets cast into them. A short rubber hose then connected these together much like some P&W radial engines. The engine sump drain was also connected into this whole design where then an electric pump returned all this oil up to the main tank. You could turn on the master and hit this switch and listen to it as it pumped the oil back. When there was no more oil, the pump would speed up and you knew it was done. Worked extremely well. However, there was no oil shut-off valve, so you just went out and did this little exercise every so often . I wrote another message on this already (sorry) but then read this and decided to go into more detail.
Mark
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Vic
Joined: 12 Aug 2008
Posts: 116
Location: Southern Bavaria
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| Posted: Thu Sep 12, 2013 1:29 pm Post subject: Re: Hydraulic Lock Prevention |
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Hello,
I´d be very interested to hear if this valve cover drain showed some reduced oil consumption. Basically there are only two ways for oil loss : Via the piston rings or via the valve stems. Maybe someone knows what Les Crowder´s experiences were in this respect ?
Vic
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JOE HOWSE
Joined: 10 Jan 2006
Posts: 140
Location: DUNCAN BC CANADA
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| Posted: Thu Sep 12, 2013 3:03 pm Post subject: Hydraulic Lock Prevention |
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Hello
I worked with Les Crowder several years ago, copied his ideas on the valve
covers except I had new ones machined from aluminum
with a boss for drilling and tapping for the drain fittings and piped to a
recovery pump. worked quite well except no way to drain all the oil from
the lower cylinder rocker boxes as the valve guides were lower than the
fittings on the covers
Also worked with Les on th SS slip joint exhaust systems he instigated, they
were beautiful.
Joe
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