Oil cooler flush

by Neil Cooper in 912 / 914 Technical Questions 7 years ago

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Re: Oil cooler flush

by Bill Hertzel » 7 years ago

Bill Hertzel

13 1.95k 7.96k

If you consider your pressure readings in the Normal Temperature ranges (<110c), you maintain > 2 bar overall.

An interesting consideration is that although the Pressure Sensor appears to be integral with the oil pump, It is functionally very far away.
The Oil enters the block in the vicinity of the Oil Filter.
After passing through the Oil Galleys, it finally arrives at the boss on the Oil Pump just above where the oil returns from the Oil Tank.

The plug on the front of this boss is where the Propeller Governor, or Turbo Charger (if you have either) sources its Oil.
Otherwise, this is the end of the line for the Oil.
The pressure you get at this point is about as low of a pressure that exists anywhere in the engine.
In other words, whatever pressure the sender sees, the rest of the engine is seeing more.

Your pressure regulator may be holding 2.5 Bar just fine, but by the time the oil reaches the sender, the pressure can drop 1/2 bar or more.

Your problem may be the Oil Temperature, the Low Pressure is just a symptom caused by the high temp.

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

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Re: Oil cooler flush

by Neil Cooper » 7 years ago

Neil Cooper

23 67 92

Thanks for the replies, The oil and cooler hoses are the last on my list of the five year rubber change, it's not something I have been able to do all in one hit but I'm nearly there. I started using Aero Shell sport plus four as soon as it came out and continue to do so. I'll see what the mechanical guage tells me before I do anything. The oil pressure reg is easy to install but I'll start with the gauge first. There is definitely no perceivable change in pressure with rpm so it think the ground at the sender is ok. I took the sender out and cleaned up the thread too. Thanks for the carb cleaner tip. The 120° has been a fairly recent phenomenon and only occures in prolonged climbs. That said, there has been some very hot weather here this summer with temps of 35-40+ ....its hard to keep my airbox temps under 37° until I get quite some altitude, and even then it still can be quite high. Perhaps I need some ducting onto the oil cooler. Given that it is a fairly recent change, it may be a seasonal thing with the above average hot weather? I'm pleased though that you all think my oil (average) pressure might be acceptable. I'll let you know what the mechanical guage says when it arrives. On that subject. Is there anything wrong with runnin the mechanical gauge Int to cockpit? I realise it means that if there is a failure I would have fluid in there, but the same could be said for the fuel pressure guage with is also a direct read mechanical gauge. It seems a more reliable reading to have the direct reading mechanical guage set up. Thoughts?

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Re: Oil cooler flush

by Roger Lee » 7 years ago

Roger Lee

125 5.12k 4.53k

Hi Neil,

If this is an acute onset issue then I would be a little suspicious. The mechanical gauge will help with the diagnosis. If it confirms an issue an oil cooler flush is easy and couldn't hurt. With 104F OAT high oil temps can be a lot more possible. I live in the desert and the OAT temps can easily get there.
While installing the oil hoses make sure none have a tight enough radius to cause a flattened area on the hose which slows the oil flow which increases heat.

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

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Re: Oil cooler flush

by Neil Cooper » 7 years ago

Neil Cooper

23 67 92

Thanks I'll let you know once I get the guage across it. Today I found where my oil leak is coming from. It's weeping from the top of the crankcase out of the seem just rear of the gearbox. It has very concerned. I took a photo but I'm not sure how to upload it

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Re: Oil cooler flush

by Neil Cooper » 7 years ago

Neil Cooper

23 67 92

Figured out the upload. The oil is weeping from this point on the top of the crankcase. I hope it's not a major problem :(

image.png (You do not have access to download this file.)

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Oil cooler flush

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