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oil shut-off valve

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popesickel(at)mindspring.
Guest

Posted: Fri Oct 02, 2009 8:13 am Post subject: oil shut-off valve

Reference to the oil shut-off valve, I have a manual shut-off valve 

installed in the bottom of my oil sump, (CJ with M14P).  From there, is 

approx 15" of oil line to the oil pump. When I shut down, I open the left 

access panel in the lower left cowling to close the valve (a red warning 

flag is left hanging out of the opening to prevent starting). This leaves 

that amount of oil in the line to siphon thru the pump during the period of 

storage until the next flight. I also have bottom cylinder drains tied to a 

central shut off drain valve, which I manually open and leave draining to a 

clean container during storage between flights. This does help resolve the 

oil-hydraulic problem.



When I prepare for the first flight of the day, I always pull the prop for 9 

full cylinders (18 blades) and  ALWAYS  get oil to drain in varying amounts, 

even with the drain valve left open.  So to sum up, even with the shutoff 

valve, I would NEVER consider starting the M14P (for the first flight of the 

day) without pulling the (1 blades. I would rather be over cautious than 

chance a hydraulic lock.

Garry Pope

N92864

"Black Bird"



---

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psb777

Joined: 12 Aug 2009
Posts: 34
Location: UK

Posted: Sat Oct 03, 2009 5:02 am Post subject: Re: oil shut-off valve

The last thing I am suggesting is that we should not be cautious.  But: 18 blades?  You seem to relate this to 9, the number of cylinders.  Are you saying that if the engine had 7 cylinders you would pull 14 blades?  Every 720 degrees of engine rotation takes every cylinder in the engine through a full cycle, no matter how many cylinders there are.  Also, the prop is geared 0.658 to the engine so 18 (two-bladed prop) blade pulls is 9 prop revolutions or 13 engine revolutions.  



I have the inlet manifold drains and I have been pulling 9 blades, that's 4.5 prop revs or just short of 7 engine revs.  Or at least 3 inlet strokes and at least 3 exhaust strokes on every cylinder.  As often as not I see no oil.  If I see more than the slightest dribble I will wait and pull again.  But I think I am being overly cautious.  My experience suggests if there is no oil by blade 5 there will be no oil by blade 9.  On the other hand I don't want to feel I am lacking in engine care by not doing 18 blades like you.  



There should be some rationality behind this.  If(!) there is no logical reasoning behind the advice to pull 18 then why is that good enough?  Why don't you pull 20 blades?



And if I am pulling 9 but only 5 can *properly* be argued to be necessary, then why pull 9?  (I will keep on pulling 9!)



Paul Beardsell HA-YAB Yak-18T

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_________________
Paul Beardsell
G-PYAK http://beardsell.com/flying/g-pyak
Yak-18T http://beardsell.com/flying/yak18t

mark.bitterlich(at)navy.m
Guest

Posted: Sat Oct 03, 2009 12:22 pm Post subject: oil shut-off valve

Gary that is a completely different shut off valve located at a completely different place than I was describing and recommending.  With the valve installed as you describe, you are absolutely correct and your recommendation is of course valid.  

 

However, apples and oranges are being compared here.  I will write up another posting and be more specific. 

 

Thanks, 

 

Mark Bitterlich

 



________________________________



From: owner-yak-list-server(at)matronics.com on behalf of Garry Pope

Sent: Fri 10/2/2009 12:06 PM

To: yak-list(at)matronics.com; Yak-List Digest List

Subject: oil shut-off valve






Reference to the oil shut-off valve, I have a manual shut-off valve

installed in the bottom of my oil sump, (CJ with M14P).  From there, is

approx 15" of oil line to the oil pump. When I shut down, I open the left

access panel in the lower left cowling to close the valve (a red warning

flag is left hanging out of the opening to prevent starting). This leaves

that amount of oil in the line to siphon thru the pump during the period of

storage until the next flight. I also have bottom cylinder drains tied to a

central shut off drain valve, which I manually open and leave draining to a

clean container during storage between flights. This does help resolve the

oil-hydraulic problem.



When I prepare for the first flight of the day, I always pull the prop for 9

full cylinders (18 blades) and  ALWAYS  get oil to drain in varying amounts,

even with the drain valve left open.  So to sum up, even with the shutoff

valve, I would NEVER consider starting the M14P (for the first flight of the

day) without pulling the (1 blades. I would rather be over cautious than

chance a hydraulic lock.

Garry Pope

N92864

"Black Bird"



---

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

mark.bitterlich(at)navy.m
Guest

Posted: Sat Oct 03, 2009 12:44 pm Post subject: oil shut-off valve

Or am I totally misunderstanding what you are saying?  Your mention of a manual shut off valve at the bottom of the oil sump has me confused.  Sorry. 

 

Mark

 



________________________________



From: owner-yak-list-server(at)matronics.com on behalf of Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E

Sent: Sat 10/3/2009 4:16 PM

To: yak-list(at)matronics.com

Subject: RE: oil shut-off valve






Gary that is a completely different shut off valve located at a completely different place than I was describing and recommending.  With the valve installed as you describe, you are absolutely correct and your recommendation is of course valid. 



However, apples and oranges are being compared here.  I will write up another posting and be more specific.



Thanks,



Mark Bitterlich

________________________________



From: owner-yak-list-server(at)matronics.com on behalf of Garry Pope

Sent: Fri 10/2/2009 12:06 PM

To: yak-list(at)matronics.com; Yak-List Digest List

Subject: oil shut-off valve






Reference to the oil shut-off valve, I have a manual shut-off valve

installed in the bottom of my oil sump, (CJ with M14P).  From there, is

approx 15" of oil line to the oil pump. When I shut down, I open the left

access panel in the lower left cowling to close the valve (a red warning

flag is left hanging out of the opening to prevent starting). This leaves

that amount of oil in the line to siphon thru the pump during the period of

storage until the next flight. I also have bottom cylinder drains tied to a

central shut off drain valve, which I manually open and leave draining to a

clean container during storage between flights. This does help resolve the

oil-hydraulic problem.



When I prepare for the first flight of the day, I always pull the prop for 9

full cylinders (18 blades) and  ALWAYS  get oil to drain in varying amounts,

even with the drain valve left open.  So to sum up, even with the shutoff

valve, I would NEVER consider starting the M14P (for the first flight of the

day) without pulling the (1 blades. I would rather be over cautious than

chance a hydraulic lock.

Garry Pope

N92864

"Black Bird"



---

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

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