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Old 20-05-2009, 14:27   #1
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Yanmar 3GM30F Raw Water Drip

Need advice,
Recently, I noticed that the water pump">raw water pump on my 3GM30F yanmar has a slow drip from beneath the housing from what looks like a weep hole.

Is this something I should be worried about?

Thanks
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Old 20-05-2009, 14:44   #2
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Need advice,
Recently, I noticed that the raw water pump on my 3GM30F yanmar has a slow drip from beneath the housing from what looks like a weep hole.

Is this something I should be worried about?

Thanks
George P

Worried...No
Fix it...Yes
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Old 20-05-2009, 15:02   #3
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The weep hole is there to warn you of a worn part.....i2f
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Old 20-05-2009, 15:31   #4
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Thanks for the quick responses. I had a feeling that the weep hole was there just for that reason. I'll start my pump search.
Thanks Again
George P
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Old 20-05-2009, 16:52   #5
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Sounds like your seals in the pump need to be replaced. The weep hole is there for a reason - it tells you when the seals are shot.
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Old 20-05-2009, 17:45   #6
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Speciald@ocens.

Are you saying that I can replace the seals only? Reason I ask is that an new pump is about $400 to $500!!
Thanks
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Old 20-05-2009, 22:46   #7
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The most common cause for this failure is the belt being too tight.

This causes a side load on the pump and alternator leading to bearing/seal failure.

All too often people put a bar and pry the alternator till the belt is "bar tight".

That is not the way it is done.

I am hesitant to post the proper method due to liability issues.....ask your local mechanic and tell us what he says....I will agree or disagree with you.
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Old 21-05-2009, 00:44   #8
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Seals are gone. It's a relatively straightforward fix
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Old 21-05-2009, 04:37   #9
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The most common cause for this failure is the belt being too tight.
This causes a side load on the pump and alternator leading to bearing/seal failure...
The proper tension for a V-Belt drive is the lowest tension at which the belts won't slip, under peak load conditions. Because drive belts stretch over time; they need to be checked & re-tensioned after operating (for 15 min to 2 hours) under load.

See also:

http://www.cruisersforum.com/gallery...r&imageuser=79
http://www.cruisersforum.com/gallery...r&imageuser=79

And an on-line belt tension calculator

Notes on Pulleys and Belts
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Old 21-05-2009, 09:04   #10
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The most common cause for this failure is the belt being too tight.

This causes a side load on the pump and alternator leading to bearing/seal failure.

All too often people put a bar and pry the alternator till the belt is "bar tight".

That is not the way it is done.

I am hesitant to post the proper method due to liability issues.....ask your local mechanic and tell us what he says....I will agree or disagree with you.
Chief I understand your concern. It shames to me that my country has come to this. In my own business I have to word everything correctly, and put it in writing to protect myself. What have we done to ourselves I ask myself at times........i2f
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Old 21-05-2009, 09:28   #11
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Chief I understand your concern. It shames to me that my country has come to this. In my own business I have to word everything correctly, and put it in writing to protect myself. What have we done to ourselves I ask myself at times........i2f

Lawyers....
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Old 21-05-2009, 21:12   #12
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Lawyers....
But I won't work on a lawyers boat...or a Phd in Education.....The latter always want to be addressed as "Doctor" while my Physician customers insist on me calling them by their first name....
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Old 22-05-2009, 11:50   #13
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Speciald@ocens.

Are you saying that I can replace the seals only? Reason I ask is that an new pump is about $400 to $500!!
Thanks
George P
Seals AND bearing!
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Old 22-05-2009, 20:26   #14
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You can buy a rebuild kit.
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Old 22-05-2009, 20:47   #15
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www.depcopump.com

That's who I use.

Good folks, excellent delivery time.
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