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I have lower unit gear oil leqking into the bilge, under

Customer Question
i have lower unit gear...
i have lower unit gear oil leqking into the bilge
JA: Sometimes boat issues seem like they'll be really complicated, but end up being easy to fix. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so the Marine Mechanic can help you best.
Customer: under power the stern drive gear oil is leaking into the bilge on my 2001 volvo sx stern drive
JA: Is there anything else important you think the Marine Mechanic should know?
Customer: not that i can think of
Submitted: 1 year ago.Category: Boat
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Answered in 3 minutes by:
7/16/2016
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 16,415
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
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Hello my name is ***** ***** am I speaking with?

Is this an SX-A or a SX-M sterndrive?

Did you have any specific or general questions that you wanted me to answer? Or are you asking where the leak is coming from?

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Customer reply replied 1 year ago
hi ken here it is a 2001 volvo penta sx-m stern drive
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

HI Ken,

Did you have any specific or general questions that you wanted me to answer? Or are you asking where the leak is coming from?

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Customer reply replied 1 year ago
im asking how gear oil can get into the bilge
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

If you look at the sterndrive, there is a shaft that runs from the top of the sterndrive through the transom of the boat, and into the back of the engine. This is the input shaft. The input shaft has an oil seal on it where the shaft enters the sterndrive. This oil seal is the one that's leaking. What it's doing is dumping oil into the input shaft bellows, and the oil is leaking from the bellows, past the gimbal bearing, and into the back of the boat.

That's what is going on with it. Did you have any further questions on the issue?

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Customer reply replied 1 year ago
is the seal(s) that you are talking about the 2 "O" rings on the shaft?
Customer reply replied 1 year ago
is there any other way that gear oil can get into the bilge besides the input shaft seal(s)?
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

No not those. Click this link to pull up a picture, the one that is leaking is #11

http://www.volvopentastore.com/mall/image/view/7/7/19618_4.png

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Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

is there any other way that gear oil can get into the bilge besides the input shaft seal(s)?

No sir, it's specifically the oil seal on the input shaft.

Was there anything else?

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Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

1 correction, in the picture I sent you the seal is #9, not 11

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Customer reply replied 1 year ago
does the gimbel bearing have to be removed to replace the seal?
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

To replace the seal, no. To replace it the sterndrive comes off the boat ad the input shaft assembly gets removed from the upper unit. When the shaft is out then the circlip gets removed (#10 in the picture) and once that is out the old seal gets punched out and the new seal gets punched in. then it all goes back together.

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Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

I do want to make sure you are happy with my service before you go. If you had a further question on the issue by all means feel free to ask. If not, Just in case you do not understand the way the website works (and some folks do not). You do have to put forth a positive rating in order for it to credit me for helping you. When ratings are not done, the website simply keeps your deposit and they will not credit me. The ratings box is located at the top of the screen. To rate, you must select the star you wish and also confirm it. Please let me know if you run into any problems or errors when trying to do it. If you do have a problem, or if you can not see the ratings box which is at the top of the screen. Please reply back "I rate Jason's service _______" and fill in the blank.

Questions do not close out, so if you have to come back later on with follow up questions to the issue you still can even after doing a rating.

Thank you
Jason

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Customer reply replied 1 year ago
got it, jason, i was thinking that the gear oil was contained by the "o" rings, but now i see that it is contained by that seal in the upper unit. thanks so much for you help. should i replace the "o" rings while i'm there? what are they for?
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

The orings are to keep dust in the engine compartment out of the gimbal bearing and bellows. The transom gasket for the sterndrive will come with new orings so you would end up replacing those as well as part of the overall job.

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Customer reply replied 1 year ago
what number is ***** transom gasket in the diagram?
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

The gasket is not shown in that diagram, but if you click this link below, this is it.

https://www.amazon.com/Sierra-International-18-2613-Outdrive-Gasket/dp/B00144EOOE

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Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

I actually have to get running, have to run out to dinner. Was there anything else?

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Customer reply replied 1 year ago
thanks, ***** ***** took the stern drive off last winter, there was no transom gasket between the ginble housing and the stern drive what does that gasket do?
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

It keeps water out of the bellows. There should have been a gasket there...

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Customer reply replied 1 year ago
thanks, ***** ***** dinner
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

Thank you. Please do not forget to put a rating through for my help. The ratings box is at the top of your screen, if you can not see it please let me know.

Good luck!

Jason

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Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

It looks like you read my reply without putting through a rating for me. Please keep in mind the website did charge you to speak with me, but they will hold your money and not credit me for helping you out if no rating is put through. If you have a problem with the ratings box or can not see it please let me know.

Thanks

Jason

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Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

Hello, just checking in. No rating has been put forth yet, did you have any other questions on the issue?

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Jason
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 16,415
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Experience: Degree in Marine Technology. Gas and diesel marine mechanic.

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