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03-14-2014, 03:04 PM
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Join Date: Jan 2007
Location: LI, NY
Posts: 409
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Copper Crush Washer On Oil Pickup Screen
I wanted to order a few copper crush washers for the oil pickup screen on my Lycoming sump. I got what they told me was the replacement part for what I had. The part number is MS35769-21. the -21 denotes the inside diameter of 1" which is correct. But my oil screen pickup has a hard flat copper washer on it. The part they sent me is a round copper case with fiber material in it. It's meant to be crushed but is that ok to use on the pickup screen? I'm hoping someone has experience with this.
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Richard Fazio
LI, NY
N966RV
RV-6 Slider
O-360
FP Wood Prop
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03-14-2014, 03:11 PM
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Join Date: Dec 2008
Location: Ontario, Canada
Posts: 464
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The one they sent is correct, throw the other one out.
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03-14-2014, 03:11 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,408
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Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010 
Phase 1 done, 2/4/2011
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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03-14-2014, 03:32 PM
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Join Date: Jan 2007
Location: LI, NY
Posts: 409
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Thanks
Thanks guys, I knew I would get the right info here.
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Richard Fazio
LI, NY
N966RV
RV-6 Slider
O-360
FP Wood Prop
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03-15-2014, 01:05 PM
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Join Date: Jan 2005
Location: St. Paul, MN.
Posts: 4,792
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Related question (sort of): The torque value for that bolt and gasket as I recall was something like "finger tight plus 135 degrees." I get a fair leak out of that spot at finger tight plus 135 degrees. so what are my options here. Tighten it more and violate the torque guidelines or just accept an oil drip there?
Also, I can never remember the rule of thumb for crush gaskets. Does the seam part face TOWARD the engine or AWAY from the engine?
Last edited by LettersFromFlyoverCountry : 03-15-2014 at 01:13 PM.
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03-16-2014, 10:12 AM
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Join Date: May 2012
Location: Houston tx
Posts: 124
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Split side goes to case and I tighten them a little bit more than the +135 degrees. Something like 20-25 FTLB, whatever feels good and tight.
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Byron
1977 Mooney 201
Houston, TX
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03-16-2014, 12:18 PM
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Join Date: Mar 2009
Location: Rochester NY
Posts: 669
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The trouble is ... if you tighten too much (more than the desired crush) the leak will leak more.
If it's only a drip, it might be worth trying a light application of fuel lube on the washer.
Dan
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RV7A (N7101) - Flying 10/2008
CFI- SE/ME/Inst
A&P
KC2ZEL
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03-16-2014, 02:00 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by LettersFromFlyoverCountry
Related question (sort of): The torque value for that bolt and gasket as I recall was something like "finger tight plus 135 degrees." I get a fair leak out of that spot at finger tight plus 135 degrees. so what are my options here. Tighten it more and violate the torque guidelines or just accept an oil drip there?
Also, I can never remember the rule of thumb for crush gaskets. Does the seam part face TOWARD the engine or AWAY from the engine?
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Use this as a reference -
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Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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