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Old 02-11-2011, 11:18   #1
TOM
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Leaking Water Pump

whilst inspecting our motor {4JH4TE YANMAR 75HP TURBO 1800 HRS} yesterday i noticed blue green powder around the water pump which tells me it is leaking ,this is a bit disapointing as the motor is just over 2 years old .Could anyone advise me on what course of action i should take as i'm keen to do the work myself .Obviously i will have to remove the pump which looks fairly straight forward,but i would love to hear from anyone who has done this before.
Thanks.
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Old 02-11-2011, 11:40   #2
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Re: Leaking water pump.

Check out this thread post #34. It gives a link to a manual. Have never done it myself but have a similar engine the 4JH4E
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Old 02-11-2011, 12:54   #3
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Re: Leaking water pump.

Thanks ,but would like to hear from any members who have had this problem .I find the manuals a little geared towards very mechanicaly minded people.
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Old 02-11-2011, 13:26   #4
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Re: Leaking Water Pump

Before wading into the deep end, try and pinpoint the leak before doing anything.
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Old 02-11-2011, 13:37   #5
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Re: Leaking Water Pump

I'm 97% certain that the leak is from the water pump the residue is just underneath the pump it has to be a leaking water pump.what i need is some one who can tell me ins and outs of getting it off fixing it and putting it back on.
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Old 02-11-2011, 13:40   #6
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Re: Leaking Water Pump

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Originally Posted by TOM View Post
I'm 97% certain that the leak is from the water pump the residue is just underneath the pump it has to be a leaking water pump.what i need is some one who can tell me ins and outs of getting it off fixing it and putting it back on.
The pump can leak from the front cover or from the shaft seal. The location of the leak will determine the difficulty of the repair.
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Old 02-11-2011, 14:28   #7
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Re: Leaking Water Pump

I have had a small leak coming from the front cover. I replaced the gasket and put in bolts that had a hex head which are easier to work with. Happened once. I have been looking for a thread but haven't been able to find it. The thread goes over the difference between the pumps for the 4JH and the 3JH the 3JH is considerably less expensive and there is only a small change needed. I'll keep on looking and link it when I find it but if someone else knows the thread I am talking about perhaps they can help.
Ok I found it Yanmar 4JH Engine Owners: READ THIS !
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Old 02-11-2011, 14:51   #8
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Re: Leaking Water Pump

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Originally Posted by TOM View Post
whilst inspecting our motor {4JH4TE YANMAR 75HP TURBO 1800 HRS} yesterday i noticed blue green powder around the water pump which tells me it is leaking ,this is a bit disapointing as the motor is just over 2 years old .Could anyone advise me on what course of action i should take as i'm keen to do the work myself .Obviously i will have to remove the pump which looks fairly straight forward,but i would love to hear from anyone who has done this before.
Thanks.
www.byamee.com
It could be leaking from a number of places : where the pipes go on, where bronze fittings are screwed in, from the gasket, and from the shaft seal. The latter is the only one that necessitates a new pump. So make it leak and look where it's coming from!
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Old 02-11-2011, 15:02   #9
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Re: Leaking Water Pump

Fix it immediately! If the leak lets sea water into your engine, it is toast!!
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Old 02-11-2011, 15:35   #10
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Re: Leaking Water Pump

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Originally Posted by Rex Delay View Post
Fix it immediately! If the leak lets sea water into your engine, it is toast!!
I don't see how that would happen if its leaking around the seal
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Old 02-11-2011, 15:44   #11
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Re: Leaking Water Pump

I had a buhk DV 20 with 2000 hrs on it. It ran perfectly except for this greenish growth around the water pump which I was attempting to track down. Short story is the engine seized but got me home. Post mortem by the mechanic was the seal had failed, the tell tale was plugged so could not see leak, sea water entered and contaminated engine oil, $15k gone!
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Old 02-11-2011, 16:44   #12
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Re: Leaking Water Pump

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Originally Posted by Rex Delay View Post
I had a buhk DV 20 with 2000 hrs on it. It ran perfectly except for this greenish growth around the water pump which I was attempting to track down. Short story is the engine seized but got me home. Post mortem by the mechanic was the seal had failed, the tell tale was plugged so could not see leak, sea water entered and contaminated engine oil, $15k gone!
Different motor different problem!!!

If the leak is coming from the seal area it'll most likely be sling water elsewhere out the casting gaps. So do check to see where the water is likely coming from. It maybe something as simple as a loose hose.



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Old 03-11-2011, 10:34   #13
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Re: Leaking Water Pump

I have been there with our 3GM, there was a small drip coming from the hole in the casting at the bottom of the water pump. It is pretty straightforward to loosen the mounting bolts, drop the belt off and the pump is then in your hands.
Remove the cover, usually 6-8 small bolts then pull the impellor out.
After that I had to remove the pulley the belt was on, then there was a snap ring or two to remove (you will need snap ring pliers) and then the whole shaft of the pump could be slid out from the housing. There is a seal on the shaft that is on the inboard end of the impeller that needed to be changed in my case. If memory serves the seal was about half the cost of a new impellor. Put it all back together and all has been well for about a year now. I should mention I am mechanically inclined by degree and profession...
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Old 03-11-2011, 12:04   #14
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Re: Leaking Water Pump

Thankyou, this is the kind of info i need .I'm going to attempt this tomorrow .The bottom right hand nut looks like it is going to be a real b--tch to get off . I have got the no of a good mechanic just in case i screw it up.

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