1GM10 cooling problem.... again! - SailNet Community

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  #1  
Old 06-25-2013
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Smile 1GM10 cooling problem.... again!

Hi All,
I'm new to the site and new to diesel trouble shooting and maintenance also.
My 1GM10 is run on fresh water and has been perfectly behaved since 2008.
It gets few hours use each season... sails up - off we go!

Now the engine is alarming after 4 or 5 minutes.
There is little or no water out at low revs, some at mid revs and almost none at high revs.
I changed the impeller, old was broken. I retrieved some of the pieces but there may be a little still at large ...?
I checked the thermostat... not functioning so replacement is ordered asap.
I ran the engine with no thermostat and still no water out.
There is water coming to the impeller.

There is a drip of water from behind the impeller unit, not from gasket.
Could this indicate something?
All water pipes look as new.

By the way...is it normal that the impeller pin is slightly off centre?

All suggestions welcome,
Captain Aubrey
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Old 06-25-2013
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Re: 1GM10 cooling problem.... again!

Sounds like your pump may be pooched.
Can you wiggle the pump shaft with the impeller out?
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Old 06-25-2013
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Re: 1GM10 cooling problem.... again!

when you say fresh water do you have a heat exchanger or are you sailing in fresh water. first check the pump by removing the discharge hose and pump into a bucket. run engine just long enough to confirm pumping or not. if it pumps you have a clog in the engine. first is to check the exhaust elbow by running the engine with the exhaust cooling hose removed. the drip behind the pump means the shaft seal needs replacing. also did you put the impeller in so the vanes go in the correct direction.
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Old 06-25-2013
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Re: 1GM10 cooling problem.... again!

I assume you mean "raw water" cooled (which is fresh water if you sail on a lake).
Yes, first check that pump is actually pumping.
If the pump works then you likely have a clog from bits of the old impeller. Check all cooling water lines after the pump, especially elbows.
Once flow is restored consider running 1 gallon of white vinegar into the engine with the thermostat removed, let it sit overnight before restarting engine. This can help clean out your cooling passages in the block.
Go sailing.
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Re: 1GM10 cooling problem.... again!

Your impeller shaft isn't actually off center, I don't think, but there's a 'shoe/cam' in the body to isolate inlet from outlet and allow the vanes to push the water through.

I'd say your exhaust elbow is the first candidate, if you've changed an impeller recently and the old one was not intact, then there may be rubber bits blocking things. Easier to find these if you've got a heat exchanger...
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Re: 1GM10 cooling problem.... again!

Thank you bljones and overbored,
Yes, we sail on fresh water so raw water cooling.
I will fit a shaft seal next opportunity and dismantle pipes from pump onwards.
There is no wiggle in the pump pin.
I will report progress as soon as i can.
Thanks again everyone.
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Old 06-25-2013
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Re: 1GM10 cooling problem.... again!

Sounds like carbon/scale build-up in the exhaust elbow. Drain the cooling system. Then take the hose off of the "out" side of the pump and blow into it. If there is more than slightest resistance the mixing/exhaust elbow is probably clogged right where the cooling water enters (usually via a much smaller elbow fitting). The same thing happened to my 2gm20 a while back. I changed it since it also had about 10 or 15 years of saltwater corrosion. Since your boat is in fresh water, you may be able to just clean it out.

It could also be a stray bit of the old impeller. If so it's probably stuck in the smaller elbow fitting. Either way you'll have to take off the mixing elbow and clean it out, or just replace it.
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Re: 1GM10 cooling problem.... again!

If no wiggle in the pump shaft, then disregard the pump itself as the culprit. I agree with everyone else- elbows and hoses.
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Re: 1GM10 cooling problem.... again!

Had a similar problem with my 1gm10. Pulled the pump cover off and found broken impeller. I replaced but still had a problem. then pulled the thermostat and found broken rubber from the impellor restricting water flow. Problem solved.. Something you might check... Cheers.
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Last edited by larrytwo; 06-25-2013 at 09:22 PM.
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