Don:
One more thing to check.....check to see that your 'o-ring seal' on your
raw water strainer is tight .....if it isn't, your water cooling system
will suck in air and not enough water to cool your engine.
If you take the top off the strainer out to clean it, you might not have
put it back together tight enough. How do I know this? Daa!
Bob Abbott
AZURA
C&C 32 - 84
Halifax, N.S.
On 2013/05/23 11:13 PM, Dennis C. wrote:
Good suggestion from Rich. Even a new impeller can spin.
Also, there may be a suction leak on the intake side of the pump.
Disconnect the discharge at the pump. Start the engine and check for
flow there. (It won't hurt the engine to run a couple minutes with no
water flow.) Try to stop the flow by blocking the hose with a rag or
your hand. If the flow and pressure are good, move downstream. If no
flow or you can stop the flow then the issue is the pump or ahead of
the pump.
If the flow is good, disconnect the hose to the little elbow you
cleaned. Check for flow and pressure there.
Dennis C.
Touche' 35-1 #83
Mandeville, LA
------------------------------------------------------------------------
*From:* Knowles Rich <r...@sailpower.ca>
*To:* "cnc-list@cnc-list.com" <cnc-list@cnc-list.com>
*Sent:* Thursday, May 23, 2013 8:35 PM
*Subject:* Re: Stus-List Overheating 3GMD - the plot thickens
Suggest checking the raw water pump impellor to make sure the
bronze insert is not spinning inside the rubber impellor. This can
happen with a new or old unit and can fool you in an inspection as
the rubber vanes may look perfect.
Rich Knowles
Indigo. LF38
Halifax
On 2013-05-23, at 22:00, "Don Jonsson" <dbjons...@shaw.ca
<mailto:dbjons...@shaw.ca>> wrote:
Hi
I had previously sent out a message about an overheating diesel.
The culprit, so I thought, was the knuckle going into the mixing
elbow, because generally when I cleaned it, it worked again. For
a while.
So I finally took of the mixing elbow and gave everything a proper
cleaning. I checked the water pump. I checked all hoses by
blowing through them and the engine.
I put it all back together and it all worked and water pumped like
it is supposed to, except the water pump leaked a bit -- needed a
new gasket, but I knew that and just wanted to see if it would
work. Got a new gasket and put it on. Started up and no water.
I took out the thermostat and checked to see it worked -- slightly
corroded but it worked, i.e. opened in hot water. Put everything
back together and started it up and a bit of water but too much
steam. Took the thermostat out and put it in more carefully.
Tried again, water running, no steam everything is perfect. Ran
it for a while just to be sure.
Turned it off. Waited a while (an hour) and started it up again.
No water.
So the problem is not the mixing elbow (and likely never was as it
wasn't that bad). Not the pump as it looks fine. Not the
thermostat -- I don't think although I will replace it.
The problem is sometimes the engine pumps water and sometimes not.
And I'm stumped.
This is a raw water cooled engine which makes things different.
Has anyone had a similar problem and ideas for a solution.
Also, it seems hard to get part numbers for a 3GMD and the local
mechanic had to go find an old book. Is there any place online to
find part numbers for that engine?
Thanks to anyone that can help.
Don
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