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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel > Universal 5411 Cooling
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


Thread: Universal 5411 Cooling Reply to Thread
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Topic Review (Newest First)
10-30-2012 08:11 PM
Ajay73
Re: Universal 5411 Cooling

I have a 5411 in my 1980 Catalina 27. My exhaust spits out very little water until the engine gets up to 150F. As I motor along the temp gauge will increase slightly over the 150F and then come back down. When the temp increases I get a lot more water flow out the exhaust and then the temp backs down to 150F. My engine runs consistently at the 150F mark. I have had people yell to me that I have no water flow out the exhaust thinking something is wrong like my intake valve is closed.

When I winterized my engine this year I had the marina do the job. They hook up a rubber coupling that covers my intake screen under the boat and then I started the engine. In this case I had water running out the exhaust continuosly and the engine temp only got up to about 125F. I must have had a lot more water bypass the thermostat than normally occurs when operating the engine with the boat in the water.
10-06-2012 01:49 PM
Stu Jackson
Re: Universal 5411 Cooling

Yes, of course. They are Kubota tractor engines. Find a Kubota tractor dealer and order a thermostat. You'll need to know which tractor engine you have:

scroll down Universal 5432 & M40 engine information

NewSite and Kubota Tractor Corporation for dealers near you.

I bought a $42 Universal thermostat from our local Kubota dealer for less than $20!
10-03-2012 09:21 AM
dbruce85
Re: Universal 5411 Cooling

Thanks,
I did look at pricing, you are right.
Has anyone ever found a non marine source for thermostats you could cross reference
10-03-2012 09:01 AM
JimsCAL
Re: Universal 5411 Cooling

The operation you describe initially is how it should operate - a little water out the exhaust until the thermostat begins to open, then increased flow. However, the flow should go up and down with the power as the need for cooling changes. Sounds like its not closing down again after you reduce power.

A new thermostat is worth a try. You're going to be shocked at what they cost however, but its worth having a spare onboard.
10-02-2012 11:38 AM
dbruce85
Re: Universal 5411 Cooling

Switched hoses back to like the diagram in the manual. At start up and until the thermostat opened there is a lot less water out the exhaust ( only the water that is getting thru the small hole in the thermostat) when the thermostat opens the water increases.
Engine only runs at about 100F. Took it for a 1/2 hour run yesterday. When I brought the throttle back to idle position it went up to around 125F. Gave it a little throttle and within 4 or 5 seconds it was back to 100F ( with a lot of water out the exhaust).
I think the thermostat is opening too soon, a new one may be my next test.
09-28-2012 09:22 PM
JimsCAL
Re: Universal 5411 Cooling

Sounds like a previous owner has modified the cooling system to eliminate the recirculation. I would go back to the arrangement in the Universal manual and see what happens.
09-28-2012 11:32 AM
Bateau25
Re: Universal 5411 Cooling

Water starts to pulse out at around a cup's worth every second or two right after starting. When the temperature has climbed to about 135 deg F the amount of water pulsing out nearly doubles. At that temperature and under load with rpm around 2000 - 2300, water pulses out almost constantly and stays that way under load. At idle, it goes back to a pulse every one or two seconds plus a full discharge every now and then. So you see I spend a great deal of time observing my exhaust pipe! BTW, the temperature of the water pump also rises to around 118 deg F when the gage shows engine temp at 136 deg F. That is due to the mixing of hot returned water and cold raw water at the mixing tee. Hope this helps!
09-28-2012 11:20 AM
Rockter
Re: Universal 5411 Cooling

Take both the thermostat and the temperature sensor out and put them in the same hot water bath on the boat.
Wire up a wee long earth return to the ship's battery earth from the temperature sensor otherwise it won't give a reading. Make sure ignition circuits are on but do not start the motor.
Put a wee bit of wood in the bottom of the hot water bath so that they don't rest on the bottom of the heating container. They may get far too hot if you do that.
Now heat the water up slowly and note the thermostat behaviour and the output to the temp guage.
I suspect that the guage is still reading zero when the thermostat opens???
Give it a try.
09-28-2012 10:52 AM
dbruce85
Re: Universal 5411 Cooling

Thanks,
How much difference do you see in the amount of exhaust water from when the thermostat is closed to when it opens?
09-28-2012 10:40 AM
Bateau25
Re: Universal 5411 Cooling

My 5411 raw water cooling system is exactly as described in the manual, and I get a temperature range from around 100 to 136 degrees F. I get the same amount of water through the exhaust port as you described in your case. A few years ago, the 5411 was always running too cold (around 100 deg F max) so I reduced the 5/8 inch line from the bottom of the thermostat housing to around 3/8 inch using a home-made brass insert. That resulted in up to 136 deg F, which I believe is much better for the engine. just my 2 cents.
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