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Old 25-10-2015, 13:20   #1
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Yanmar 1gm water discharge

I just replaced a defective impeller on my yanmar one GM I don't seem to be getting too much water coming out the exhaust. How much water should be coming out? I was using the bucket method and it didn't seem to be drawing any water whatsoever? Is there a thermostat like a car would have in this thing?
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Old 31-10-2015, 21:30   #2
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Re: Yanmar 1gm water discharge

Check for "crunchy" hoses, calcium build up in the raw water feed hoses can cause this problem.



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Old 31-10-2015, 22:26   #3
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Re: Yanmar 1gm water discharge

The replaced impeller was defective? Does that mean broken? If so, the broken pieces could be clogging the heat exchanger.

Was the new impeller installed with the blades flexed in the correct direction?
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Old 01-11-2015, 02:02   #4
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Re: Yanmar 1gm water discharge

Have you checked you mixing elbow (water injection point on the exhaust) for blockage?
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Old 01-11-2015, 02:08   #5
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Re: Yanmar 1gm water discharge

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Originally Posted by larman View Post
I just replaced a defective impeller on my yanmar one GM I don't seem to be getting too much water coming out the exhaust. How much water should be coming out? I was using the bucket method and it didn't seem to be drawing any water whatsoever? Is there a thermostat like a car would have in this thing?
Is it raw water cooled or do you have an heat exchanger?

The thermostats are quite different between these systems and operate in different manners.

If the engine is fresh water cooled (i.e. heat exchanger), the thermostat has no effect on the raw water discharge.
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Old 01-11-2015, 02:12   #6
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Re: Yanmar 1gm water discharge

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Originally Posted by Neo View Post
The replaced impeller was defective? Does that mean broken? If so, the broken pieces could be clogging the heat exchanger.

Yes, this could be a reason for reduced water flow


Was the new impeller installed with the blades flexed in the correct direction?
However, in the pumps fitted to these Yanmar engines, it doesn't matter which way the impeller vanes are flexed during assembly. The first revolution of the pump will re-align any incorrect vanes.
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Old 01-11-2015, 04:51   #7
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Re: Yanmar 1gm water discharge

" I was using the bucket method and it didn't seem to be drawing any water whatsoever?"

If you are trying to lift water from a bucket with air in line (not primed) then you may not get water. Not 100% sure what you are doing.
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Old 01-11-2015, 11:19   #8
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Re: Yanmar 1gm water discharge

You could pull the hose off of the outlet side of the raw water pump, and then see if it pumps water or not. If not, it's either sucking air from the strainer (hope you installed one), or isn't primed.

Raw water engines don't have heat exchangers so that won't be a problem.
And the impeller will change to the proper position if installed incorrectly.
What happened to the old impeller to cause a "defect", or was it chewed up?

You can also pull off the hose connecting to the exhaust riser to see if it has good flow.
These are simple engines but cooling passages can get clogged up in a few ways.
Start at the source of the water, inlet thru hull valve, To be sure the thru hull valve is clear


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Old 03-11-2015, 16:18   #9
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Re: Yanmar 1gm water discharge

If you get no water, then your bucket method is not working.
They don't put out a lot of water.


Why can't things remain where i carelessly left them?
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Old 04-12-2015, 20:53   #10
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Re: Yanmar 1gm water discharge

Did you get it figured out. I was in the same boat" 83 tanzer 27" as you in May/15 when I bought my first boat. Got it running and found it spits water out. Not a solid flow. I had changed the impelled, mixing elbow the exhaust connecter and starter. Now starts right up. We are on the lower Chesapeake bay and am starting to really like this boat. I think we are the only Tanzer 27 owners around the net. Feel free to message me if you think I can help.

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Old 05-12-2015, 05:33   #11
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Re: Yanmar 1gm water discharge

Greetings and welcome aboard the CF, Ken.
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Old 05-12-2015, 17:53   #12
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Re: Yanmar 1gm water discharge

Thanks GordMay, been following some things here and decided to jump in when I found another Tanzer 27 owner out there. An 83 at that. Except for the usual 2% this seems like a good bunch to hang out with. Thanks again for the wave.

Ken
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Old 06-12-2015, 10:38   #13
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Re: Yanmar 1gm water discharge

Thanks for the replies, it is a work in progress going to go out today and prime the pump which I did not do. When I replace the impeller it came out intact but the center metal ring was detached from the rubber so I guess the metal was spinning but the rubber stayed still. Either way it came out intact. I do get some water out almost in a trickle not a stream. Will update as soon as trying priming the pump.
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Old 12-12-2015, 13:51   #14
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Re: Yanmar 1gm water discharge

Finally got out to work on the boat. I primed the water pump/impeller and she worked like a charm. It drew the water right out of the bucket and I was able to winterize the cooling system. Thanks all for your help.
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