Oil Change

[8322]

Do you guys n gals subscribe to oil analysis every change or every other? Just trying to build my own “oil change theology”

[8342]

I am in a little different situation with the 140 that I just purchased, but here is my plan with it.
It sat for several years and needs a lot of TLC to get it bad into shape.
The ultimate goal is to fly it for a while and then resell it.
With those thoughts in mind here is my plan for oil changes:

1. Install spin on oil filter. The screen will just not get the oil near as clean as a filter. The cleaner oil should make the engine last longer. They are not very expensive considering the cost of overhaul. I know I will not get my money back but it is a selling point when I do.

2. Change oil every 25 hours. Doing oil analysis each time to get a trend established as to how the engine is running and if any abnormal wear is occurring inside the engine.

3. Use Cam Guard to help reduce the wear inside the engine.

4. I too use the cardinal numbers game with oil changes. One look at the tach and you know if a oil change is needed.

5. Warm the oil before changing it. With it sloshing around inside it will get any of the heavier contaminants mixed with the oil and drain out before they have time to settle. Less contaminates, less wear.

Just my thoughts,

Rick

[8322]

I think I’m going to do the analysis thing too. Maybe every other. I think I’m going to skip it my first as it sat all summer so it probably going to show high from my understanding of them and begin once it’s been flying regularly again.

[8337]

Does the crush washer need to be replaced every time. If so what is the part I need. Where is the screen and how is it removed?

[6643]

AN900 crush washers are single use. (You can only crush them once...)

The oil screen is inside the round housing on the right side of the accessory case. The oil temperature probe is plugged in the back of the housing. Carefully remove the oil temperature probe, then unscrew the square 1 inch flats to remove the screen from the housing.

[8337]

Thank u John! That’s what I needed to know! I’m going to try and find the part to order it.

[8337]

Any Idea what size AN900 crush washer I need?

[6643]

AN900-28 for the screen and AN900-10 for the oil temp adapter. Both numbers have been superseded to MS35769-48 and -11 respectively.

[6352]

John, this sort of information is why this forum is so valuable. Thank you.

[bill_e]

Reviving this thread to ask a technique question. For those of you doing oil analyses during the oil change, what's the best way to take a sample without contaminating it? Would hate to get scary results then find out later it's my collection bucket that needs a top overhaul and not my engine! C-85-12, for reference.