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Larry |
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RHill |
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I did not document which cylinder got the new pin, so I would likely have to pull 3-4 cylinders to replace the opposing pin. That means most of the baffling has to come off :mad: I found the SI from Superior, they indicate the weight issue with interchanging, but they don't document the weight difference. If it is only a few grams, I figure it will fall under the tolerances for out of balance rods. Given that my rods were balanced, I should have some room for some weight offset margin. I will call superior tomorrow. Larry |
Perhaps another point of view - it isn't especially alarming that a freshly assembled engine will generate some aluminum, and it's very possible that it's the piston pin plugs. But it may not be. Sorry to say, but there are many other potential issues. So, I'd recommend that you just follow the guidance of the service letter (earlier post) and not assume the source.
If, with a little more time, the metal stops showing up in the filter, then I'd leave it alone. I definitely would not pull a jug to replace a piston pin plug. (If somewhere down the line it has to come off, that's another story.) There are so many reasons that there could be balance issues that it might be easier to take it to a shop that does prop balancing once you get past the question of where the metal is coming from. YMMV Dan |
rHill may have figured out my shavings issue. My block came back shiney clean from ECI with the gallery plugs out (it had clearly been "hot tanked" as all of the paint was gone). This was my first aircraft rebuild, but have done many auto engines. Auto machine shops (performance shops anyways) fully clean the blocks after machining and the rebuilder doesn't need to clean out the galleries. Though they don't install the gallery plugs for you. I foolishly followed that convention and didn't think to clean out the galleries. If aviation shops don't clean them, that would explain the alum. flakes.
Either way, I will cut another filter at 10 hours. As long as the quantity of metallic debris is on the decline, I'll just keeping pulling filters every 10 hours until comfortable that it has stopped. Thanks for all of the guidance here. Larry |
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Larry |
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Prop ballance
The new Dyna Vibe will pick up prop and crank unbalance.Sometimes you wont feel vibration that the tool will pick up. It's money well spent,have the prop balanced,it will put your mind at ease,any weight difference,will as you noted, be small,pulling the engine apart at this point will do more damage then good.One final note,along with the filter change,pull the finger screen at the back of the sump.
RHill |
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Larry |
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