High Oil Pressure proven

by Stuart Duncan in 912 / 914 Technical Questions 6 years ago

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Re: High Oil Pressure proven

by Stuart Duncan » 6 years ago

Stuart Duncan

2 5 0

The problem existed before I replaced the plug screw and the spring with the new style plug and a new spring. I have examined the old ball under a dissecting microscope and it is pristine but I put a new ball in anyway. I have tried both ways with the old and new spring plug and ball without any change.

The mechanical gauge was rock steady except with throttle changes.

Would a restriction somewhere other than the pressure relief system cause high pressure. I am thinking of removing hoses and examining them for internal damage. As previously mentioned they are on their 4th year of the 5 year replacement. My brother-in-law (non aviator) wondered about a piece of damaged o-ring loose somewhere but I would think I would have an oil leak in that case.

I am coming from a very limited knowledge base with no previous experience working on any sort of engines, aviation or otherwise. Everything that I know I learned from Rotec's videos. I say that to let you know how much I appreciate the help you have provided. There is no video on taking apart the oil pump but I have studied the heavy maintenance manual and if need be I will have a go at it. Local help is nonexistent. The joy of living in the forest a long way from aircraft mechanics. It's great.

Stu

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Re: High Oil Pressure proven

by Bill Hertzel » 6 years ago

Bill Hertzel

13 1.95k 7.97k

The only other way you might raise the oil pressure would be if the Crankcase is not venting.
This would show up when "Burping" the Oil Tank.
It is possible that the line from the crankcase to the Oil tank or the Oil tank vent line is plugged.
Crankcase pressure will overpower the Oil Tank Cap if it could not get out the vent hose.

Try removing the Crankshaft Lock hole plug just forward of, and above the #2 cylinder.
Blow a small amount of compressed air into the hole; Maybe 1-2 seconds worth.
The first shot might take a few seconds before the Oil Tank Burps due to the residual Oil.
Any subsequent Burps should happen immediately and be very Vocal even with the Oil Cap secured in place.

If, after 10 seconds, all the air just comes back out of the hole, you have found the problem.
- - - - -

Disassembling the Oil Pump Is very straightforward.
If you think you can do it, you probably can.
Having a "Can-Do" attitude will make up for experience.
If you can successfully change a tire, you can pull an Oil Pump.
Just pay attention to O-Rings, the Drive Pin, and the drill spots as mentioned earlier.
There are only about 8 parts to the whole thing.

Print out the Second post.
The instructions are about as over-detailed as I could get.

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

Thank you said by: Stuart Duncan, Roger Lee, RotaxOwner Admin, Alexander Cameron

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