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Old 01-14-2020, 07:03 AM
rich rich is offline
Join Date: Feb 2006
Location: Fort Worth, Tx
Posts: 180

After 1950hrs and 18 years I had the prop shop do a IRAN (inspect,repair,as necessary)on the prop. Prop was not slinging grease but I felt a slight imbalance.
Hub was impacted with grease after 6 pumps x 18 years. They cleaned it out, replaced seals and said Hartzell recommends only 2 pumps in each blade at annual.
Cost was $700. Much cheaper than a overhaul.
Hangared and flown regularly.
Rich Rudolph
RV6A 2000 HRS.
Fort Worth,Tx.
Wright Brothers “Master Pilot” Award
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Old 01-14-2020, 07:57 AM
dekagram dekagram is offline
Join Date: Jan 2008
Location: NOLA
Posts: 10

Thanks for replies...

I'm thinking that after 12 years, the blade retaining seals eventually become hard and flatten out. It's impossible to know whether a little grease on a blade is a nuisance leak from a seal or a crack developing.

All the best,

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Old 01-14-2020, 09:11 AM
Bavafa Bavafa is offline
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,324

I had read and was told four pumps in the past. I don't have the manual handy to see where I read it. But it was four pumps or till grease comes out of the other hole.
N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - Flying
Dues paid
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Old 01-14-2020, 09:40 AM
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rocketbob rocketbob is offline
Join Date: Jun 2006
Location: 8I3
Posts: 3,557

I've had a number of these props apart and have resealed them myself so I know how the bearings and races work. It is my opinion that greasing these propellers does nothing but cause problems. It is in essence a sealed bearing and there is not enough movement in the bearing rotation (around 1/8" or so) to warrant yearly regreasing.

There is virtually no way for contaminants to enter the bearings and races.

I would be willing to bet that if there was ZERO grease in the bearings nothing adverse would happen.

Why doesn't the manufacturer employ dry-film lubrication so that there is no reason to ever grease them?

I could go on but my $.02 is to not bother.

Please don't PM me! Email only!

Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.

Last edited by rocketbob : 01-14-2020 at 09:45 AM.
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Old 01-14-2020, 11:48 AM
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RV8JD RV8JD is offline
Join Date: Jan 2005
Posts: 914

Originally Posted by Bavafa View Post
I had read and was told four pumps in the past. I don't have the manual handy to see where I read it. But it was four pumps or till grease comes out of the other hole.
See Posts #7 & #10.
Carl N.
Arlington, WA (KAWO)
RV-8, 780 Tach Hours
(Pic 1),(Pic 2)
- Out with the Old, In with the New
RV-8, 1938 Tach Hours (Pic 1),(Pic 2) - Sold

Glasflugel Standard Libelle 201B - Sold
Rolladen-Schneider LS1-f - No longer owned
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Old 01-15-2020, 07:56 AM
Red Mtn flyer Red Mtn flyer is offline
Join Date: Jul 2017
Location: Carson City, NV
Posts: 120
Default to dekagram

From the pic, your diagnosis is correct - a leaking seal. Depending on your flight sched, and $$/ comptroller issues, fly it or IRAN it [NOT "overhaul"]. It will get worse, but primary issue at this stage is cleaning the grease off. {I'm assuming this is not a 15 minute accumulation, of course.]
AS for 'annual greasing': the prop needs what it needs, not what you want to give it. '2 pumps' '4' '6' are all rubrics that have more to do with maintainer's habits than the prop's needs. Read the Hartzell book and do it their way [or MT's, or WW's if that's what you have].
Ben K.
A&P; RLSA - A,G,W/S Falco F-8L
50 yrs of flight and counting
Dues paid 2017 thru 2020
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Old 01-16-2020, 07:16 AM
Boyd Birchler Boyd Birchler is offline
Join Date: Sep 2014
Location: IN
Posts: 254

On an 800 hour prop DO NOT have it overhauled! If it keeps leaking, have it resealed,ONLY. On an overhaul they remove 5/1000 inch,or more, by grinding/sanding off the thickness of the blades. The result after a few overhauls is the blades may no longer meet minimum thickness or chord and need to be scrapped.
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