Oil Temperature Thermostat

Re: Oil Temperature Thermostat

by James Dugan » 14 years ago

James Dugan

1 4 0

The way I understand it is the thermostat always allows a little oil to pass through it, but opens up more when the oil heats up.

Re: Oil Temperature Thermostat

by Paul Winder » 14 years ago

Paul Winder

2 6 0

Thanks, James, do you think the first oil pressure indication would still mean the air is out or would you push a little extra oil through?

Re: Oil Temperature Thermostat

by bill martin » 14 years ago

bill martin

10 757 0

Paul,

The oil thermostat never closes off the oil flow to the cooler completely. The reason being that If you shut it off completely, when the thermostat opened it would suddenly dump very hot oil into a very cold oil cooler. By letting a little oil through the cooler constantly, it is warmed and gets no cold shock from being suddenly filled with hot oil as the thermostat opens. You can purge a cold engine with a thermostat per rotax instructions just as you would an engine without a thermostat. It just may take a few more pulls on the prop. If you are adding the thermostat to an engine that has already been run, and your inlet and outlet are on top of the oil cooler, the cooler will be full of oil already and you should have no problem at all purging. If your inlet and outlet are on the bottom of the cooler, it may take a little longer to get the air out of the cooler. Richard can probably give you more details than I can.

Bill.

Re: Oil Temperature Thermostat

by James Dugan » 14 years ago

James Dugan

1 4 0

I removed the upper spark plugs and turned the prop over by hand until I had oil pressure on my gage and then installed the spark plugs and turned engine over until I heard the gurgle in the oil tank serviced the tank up to the full mark. I then started the engine keeping a close watch on the oil pressure, ran engine maybe 5 minutes or so and shut down and checked oil level in tank again, at that time I had to add a bit more. Thats what I did.

Re: Oil Temperature Thermostat

by Roger Lee » 14 years ago

Roger Lee

131 5.38k 5.44k

Here is the correct way to purge the system. Just rotating the prop and looking for oil pressure will give a false reading. You may get oil pressure, but still have air in one of the lifters and then you run it and the lifters can't pump air so you ruin the lifter, rod and more. You need pressure to all areas that get oil and depend on the oil to operate correctly. Oil purges aren't hard and really don't take that long once you have done one.



http://www.rotax-owner.com/information-reg/expanded-video-instructions-reg/33-exp-si-912-018

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Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell