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Prop Oil seal test pressure

 
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SnowTexan



Joined: 08 Aug 2019
Posts: 185
City/Region: Carlton
State or Province: WA
C-Dory Year: 2006
C-Dory Model: 22 Cruiser
Vessel Name: Miss Maria
Photos: Miss Maria
PostPosted: Mon Aug 03, 2020 10:06 pm    Post subject: Prop Oil seal test pressure Reply with quote

So I pulled my lower unit to swap out an impeller and decided to pull the prop and inspect the seals. The outer seal looked terrible. I am a long way from any marine mechanic and do not have the proper tool to remove the prop shaft so I did the 5th or 6th best thing: i picked the worn seal out with a screwdriver (taking care not to scratch the shaft and shred the replacement shortly after installation). The inner seal looks great, and I performed a leak test using my dingy hand pump and some gorilla tape. Yeah thats right all you professional mechanics you read that correctly 😂. I left the inner seal after seeing no air bubbles escaping with a soap and water mix. Replaced outer seal. Best I can do under the circumstances but my question is this: when a shop tests for leaks how much pressure is used? The quest for self reliance continues via reliance on cbrat wisdom.

Thanks!

Nigel
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thataway



Joined: 02 Nov 2003
Posts: 20778
City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
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PostPosted: Mon Aug 03, 2020 10:50 pm    Post subject: Reply with quote

12 PSI, and should keep the pressure for 5 minutes. It is tested thru the upper port. The soapy water does a good job. You should be good to go.
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Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
Thisaway 2006 22' CDory November 2011 to May 2018
Caracal 18 140 Suzuki 2007 to present
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
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tsturm



Joined: 01 Nov 2003
Posts: 1134
City/Region: Soldotna
State or Province: AK
C-Dory Year: 2003
C-Dory Model: 25 Cruiser
Vessel Name: JMR TOO
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PostPosted: Mon Aug 03, 2020 10:56 pm    Post subject: Reply with quote

thataway wrote:
12 PSI, and should keep the pressure for 5 minutes. It is tested thru the upper port. The soapy water does a good job. You should be good to go.


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SnowTexan



Joined: 08 Aug 2019
Posts: 185
City/Region: Carlton
State or Province: WA
C-Dory Year: 2006
C-Dory Model: 22 Cruiser
Vessel Name: Miss Maria
Photos: Miss Maria
PostPosted: Mon Aug 03, 2020 10:56 pm    Post subject: Reply with quote

Alright thanks sir! Is it normal
For the prop to be a little stiffer at first after what i’ve done?
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T.R. Bauer



Joined: 17 Nov 2007
Posts: 1726
City/Region: Wasilla
State or Province: AK
C-Dory Year: 1993
C-Dory Model: 22 Cruiser
Vessel Name: C-Whisperer
PostPosted: Tue Aug 04, 2020 12:04 pm    Post subject: Reply with quote

I'd expect that since you actually have a seal now. Good Job Smile
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srbaum



Joined: 30 Aug 2010
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City/Region: Portsmouth
State or Province: VA
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Vessel Name: Osprey
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PostPosted: Tue Aug 04, 2020 12:25 pm    Post subject: Reply with quote

Something that is best practice, is to always pull the prop and related washers at each oil change period. This allows a good inspection of the propeller blades, ensures that the prop does not freeze up on the shaft, so that it can be changed in the future, allows a visual inspection of the seal and most of all, you get to ensure that there is no fishing line wrapped forward of the prop, chewing away the shaft seal.
You can true up the prop as needed with a block of wood and a ball pen hammer (minor dings) and you can use a file to clean up any burs.
When reinstalling the prop, lubricated the prop shaft and washers with a waterproof grease (synthetic Green Grease for your local auto store is great for this) place a small piece of 2x4 wood between the prop and the underside of the anti-cavitation plate. This will allow you to tighten to prop and align the nut to except the cotter pin.

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SnowTexan



Joined: 08 Aug 2019
Posts: 185
City/Region: Carlton
State or Province: WA
C-Dory Year: 2006
C-Dory Model: 22 Cruiser
Vessel Name: Miss Maria
Photos: Miss Maria
PostPosted: Tue Aug 04, 2020 2:36 pm    Post subject: Reply with quote

T.R. Bauer wrote:
I'd expect that since you actually have a seal now. Good Job Smile


Hah! Yes that occurred to me shortly after posting. Thank you all for the replies.
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