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CJcanuck

Joined: 05 Jul 2006
Posts: 39

Posted: Fri May 02, 2008 6:51 am Post subject: Prop's

Hey All!



I've just reinstalled my prop after having it overhauled and repainted.   After shutting down from the first run we had a small amount of grease running down each prop blade from the hub  The flow is symmetrical as far as I can tell. Having brand new seals and all I'm wondering if this is 'normal' or if there are other issues at work here.



On a related issue, I'm keen to contact the company in Australia that is selling the prop spinners and some of the speed mods.  Anyone have contact info?



Thanks!



Mike Kirk

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talew(at)bellsouth.net
Guest

Posted: Fri May 02, 2008 7:35 am Post subject: Prop's

A couple of questions?

1)What kind of prop?

2) Is the grease on the blade really grease or is it engine oil?

Terry Lewis

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cpayne(at)joimail.com
Guest

Posted: Fri May 02, 2008 8:13 am Post subject: Prop's

Assuming you have the paddle blage prop, sounds like a normal situation following re-greasing. A certain amount of grease, smeared inside, is going to be thrown out for the first few hours. Be concerned that a blade seal is not seated if it lasts longer than that.



Crai Payne

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wlannon(at)persona.ca
Guest

Posted: Fri May 02, 2008 8:31 am Post subject: Prop's

That could be a normal condition after overhaul if excess grease was left 

outside of the blade seal area. Clean it and recheck. Is it both blades?

If it continues you need to know whether it is grease or oil. Oil can only 

come from the pitch change unit or transfer tube and will initially show up 

leaking from the front of the hub at the "spinner" cap.

Eventually it will fill the hub, dilute the grease and leak past the grease 

seals. The usual source is the two pitch change seals which would be 

replaced at overhaul.

Who did your overhaul?



Walt

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mark.bitterlich(at)navy.m
Guest

Posted: Fri May 02, 2008 10:36 am Post subject: Prop's

Not sure whether the CJ is identical to the M-14 in this regard, but on

the latter, there is a third source for the problem that you detail (oil

getting into the hub and diluting the grease to the point where it makes

it out past the prop shaft seals) and that is the transfer tube seal

itself.  This is a crush washer type deal that is installed "underneath"

the threaded portion of the transfer tube that screws into the motor and

then sticks out and provides the oil path to get into the hub itself.  A

lot of people like to try and use these seals over again after pulling

them out for inspection.  That doesn't work real well.  



Good luck, 



Mark Bitterlich

 



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Bill Tally

Joined: 11 Jul 2007
Posts: 20

Posted: Fri May 02, 2008 10:51 am Post subject: Re: Prop's

George Coy wrote an excellent article on prop maintenance that appears in Vol. 5, No. 2, page 3 of the old "Yak Driver" publication (from 1997).  Referring to the assembly procedure, George says "You will see also that there is a blade "v" type seal that is supposed to retain the grease.  I have found that these are not very effective, and that for the first 5 to 10 hours after lubricating the prop, grease will run out of these shank seals and leave streaks on the prop.  That is just the way it is."



I have found George's observations to be right on point.

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wlannon(at)persona.ca
Guest

Posted: Fri May 02, 2008 6:21 pm Post subject: Prop's

Mark;



The J9 G1 and the V530 are absolutely identical in this respect.  If you 

would re-read my post you will find that I did refer to the transfer as a 

third potential leak source.



Cheers;

Walt



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mark.bitterlich(at)navy.m
Guest

Posted: Mon May 05, 2008 12:04 pm Post subject: Prop's

Thanks for explaining that both props are the same in this regard Walt.

If you will re-read your post you will see that it mentioned the

transfer tube as a possible source but did not give any details on the

crush washer and where it was and the fact that it can not be reused

without the strong chance of it leaking again.  If you will re-read my

post you will see that I just was trying to add more detail to your

already excellent comments. 



By the way, Doug Sapp has the seals on hand for anyone who needs them.

Bon Chance, 



Mark



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