Oil Seal

[jh121]

Hi all
I have fitted several oil seals to my prop shaft on my mariner 150 but it still leak . The latest seal is as good a fit as i can see. So I am stumped. Any suggestions pls ? Should i add a layer of say silicone sealant or like before pressing in the seal ? thks

 

[carholme]

Re: Oil Seal

Did you replace the O Ring around the bearing carrier before you installed it?

What is your engine s/n?

You say in your previous posts that you had a piece broken out of the prop hub. Did you hit something?

Did you do a prop shaft runout to see if you bent the shaft?

Gerry

 

[Texasmark]

Re: Oil Seal

Do you have a lot of operating hours on this engine? Sometimes rubber seals will score a groove in the shaft they are protecting requiring either a sleeve or a new shaft.

Mark

 

[Moody Blue]

Re: Oil Seal

Are you randomly trying different seals for a "best fit"? Have you tried the recommended seal?

What do you mean by 'still leaking'? Leaking oil OUT of the lower unit or leaking water INTO the lower unit?

Silicone is never the answer, especially if it is continually submerged in water.

 

[jh121]

Re: Oil Seal

Hi Gerry
Thank you for your reply and apology for late response as i was travelling.
I did not replace O ring around bearing carrier. I did try to remove the bearing carrier but that resulted in a few broken teeth on the carrier. Is there a special tool to remove carrier ? Do I have to drop the lower unit first ? Is it necesarry to remove carrier in the first place ?
My engine is a V6 Mariner Marathon 2 litre. The serial no. is 0810650 ( or 0B10650 ? smudged ). But I can't seem to find this serial no. on this site. Its probably a 1980s or early 1990s 150 or 175hp model. Again I am stumped.
I had a piece of carpet caught in the prop the other day.
No I did not do a shaft runout. I dont think i bend it.

Further advice appreciated. Especially regarding bearing carrier oil seal. Thks

 

[jh121]

Re: Oil Seal

Hi Mark
I bought the boat used last year . It was based in my club. From what I see I dont think it has high operating hours, though its more than 20 years old.
One thing I noticed is that the shaft oil seal is not leaking where it grips the shaft but leaking on the outer circumference. Strange.

Joe

 

[jh121]

Re: Oil Seal

Hi Moody Blue
I bought a new seal using the old as a sample. It was too loose. Then I tried several before settling on one that fit well. I did not use a recommended seal as I dont really know my engine model.
I can see oil leaking out of the lower unit. Also I drain the gear oil after 1 use and it is yellow and milky, so I think water is getting in as well.

Joe

 

[carholme]

Re: Oil Seal

What is the P/N of the seal which you purchased?

There should be a disc on the powerhead with the s/n stamped into it. Here is a link to see what the disc looks like:

http://imageshack.us/a/img84/8224/391496208.jpg

Gerry

 

[carholme]

Re: Oil Seal

As there is one number missing from the end of the s/n, I have inserted all numbers from 0 thru 8 and all result in:

MARINER - (200 H.P. (1986 ))
Serial No: 0B106505 Model No: 7200726 2.4 L

Inserting the only number left, that being a 9, results in:

MARINER - (135 H.P. (1986 ))
Serial No: 0B106509 Model No: 7135876 2.0 L

So it would be helpful if you can confirm the s/n from the disc on the powerhead.

Gerry

 

[jh121]

Re: Oil Seal

Gerry thanks
will try to confirm s/n

 

[Moody Blue]

Re: Oil Seal

Hi Moody Blue
I bought a new seal using the old as a sample. It was too loose. Then I tried several before settling on one that fit well. I did not use a recommended seal as I dont really know my engine model.
I can see oil leaking out of the lower unit. Also I drain the gear oil after 1 use and it is yellow and milky, so I think water is getting in as well.

Joe

Can you determine if the oil leaking out is gear oil or unburnt combustion sludge? Gear oil smells like, well, gear oil and is light brown while combustion sludge smells "gas" like and is dark brown/black. Could be you are just seeing "normal" combustion fluids leaking out thru the prop hub exhaust.

Can you pressure test the lower unit?

 

[Maxz695]

Re: Oil Seal

There is an Oring on the center that may have a nick View attachment 179603View attachment 179604View attachment 179605 I hope this helps View attachment 179606

 

[jh121]

Re: Oil Seal

Gerry
I have located the s/n on the disc on the powerhead and it reads 6520508
thanks to your picture

 

[jh121]

Re: Oil Seal

Hi Moody Blue
I am quite sure its gear oil
After changing to new gear oil , the leak looks and feel like the new gear oil.
Pressure testing sounds like a good idea thks

 

[jh121]

Re: Oil Seal

Maxz
Pardon me but your pictures are which part of the engine ?

 

[carholme]

Re: Oil Seal

Joe;

The s/n from the powerhead, 6520508 comes up as:

MARINER - (150 H.P. (1984 ))
Serial No: 06520508 Model No: 7150824

Something strange here as this s/n is different from the previous one you gave me, 0B10650 ? smudged. Where did you find the 0B s/n?

As well, what parts list did you use to order the seals or what p/n seals did you order?

It is possible that the powerhead has previously been changed.

Most of the parts lists I am looking at do not even show a model 7150824, yet Mercury confirms it but even they do not have the full parts list.

I will do some more research and come back to you but if you could answer the questions, it would help.

Gerry

 

[CharlieB]

Re: Oil Seal

Most bearing carriers have two seals, one stacked onn top of the other.

Are you changing both propshaft seals in the bearing carrier?

 

[Maxz695]

Re: Oil Seal

Sorry was a long day yesterday I missread, and your stating prop shaft not shift shaft please disregaurd. Did you check for out of round (Shaft bent) and wing worrm (Seal wear groove)on the prop shaft? The other seal had a reason it failed. Did you hit something? You need a dail indicator to check for a straight shaft as a wobbely shaft will cause it too leak. I know on a power head seals can be inserted in a reverse direction but I have no clue as to if this would be able to be done on the propshaft seal on an LU.

 

[oldman570]

Re: Oil Seal

If the powerhead or the trasom bracket have been replaced as Gerry sugguests, then it might be best to pull the LU and dig into it and see if you can find a part# on one of the componets. Then you can match it up with the rest of the parts for LU's that used that part# inorder to get the seals needed to replace the ones in your unit. A pressure/vacum test should be done to confirm just where the leak is comming from. JMO
Oldman570

 

[Maxz695]

Re: Oil Seal

I believe using Loctite on the outter perimiter before instaling the seal is required and you should check the manaul to confirm if this is correct information or not.( Never use permatex gasket maker or sealer as it will tear the seal to pieces if caught between the shaft and the seal.) I would also inspect the carrier for a hairline crack letting oil seep past the outter edge of the seal. This can be fixed if you can locate it with PB weld after a good cleaning and sanding to make it adhere better. Heli arch welding can be done as well. Replacing the carrier is also an option. You may find one cheap on ebay. JMO. Also as stated by Oldman570 Presure testing the LU is a great idea before going to much farther.