Oil presure Rotax 912ULS

[Johan Nortje]

Is there someone that can give me guidance. I have the following problem with my Rotax 912 ULS.

Ad normal operating revs 4900rpm the oil pressure is 65 - 70 psi. Sins last week for some reason the oil pressure "jump" to 90 - 110 psi for max. 5 seconds and then back to normal for +- 5 min, and then up again for 5 seconds etc etc.
What is the reason for this, and is it harmfull to the engine.
The engine has done only 180 hours. I have a MGL oil pressure gauge.
I have already replace the oil and oil filter, and and the problem still exist, at 1800 rpm.

Please help me.

[MAGNIficent]

This might be your Oil Pressure Sender - VDO or the pressure relief ball and spring.

[Johan Nortje]

Thanks, I will replace the VDO tomorrow. I have allready clean the ball and spring.

[Morph]

Comet sell a fix for the ball and spring, part 100857230, Oil Pressure Control Valve, about R180. replaces the ball and string. I am thinking of moving my VDO off the engine and mounting it on the firewall, with a flexible rubber tube connecting it to the engine. I replaced two VDO sendors in 100 hours

[Dobbs]

Agree with Morph, I am on my third VDO sender in 500 hrs, next one will go on the fire wall.

I enquired about an electronic alternative which is available, and even these are not trouble free.

[MADDOG]

In my experience, the capillary tube gauges are more reliable but make sure you protect the capillary tube.