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  #1  
Old 02-26-2019, 08:00 AM
flysrv10 flysrv10 is offline
 
Join Date: Jan 2010
Location: Florida
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Default how often do you remove your prop to clean sludge in the hollow cranck?

Let time I removed my prop for nose seal replacement i was shocked by the amount of sludge I found. What is the recommended interval for cleaning the crank? thanks.
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  #2  
Old 02-26-2019, 09:22 AM
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Rick_A Rick_A is offline
 
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Default Fan Belt

I think the real question should be how often do you replace your fan belt?

On average, I replaced my fan belt every three years and cleaned out the sludge while the prop was off.
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Old 02-26-2019, 09:45 AM
Bavafa Bavafa is offline
 
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What the heck is the fan belt?
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  #4  
Old 02-26-2019, 09:58 AM
bob888 bob888 is offline
 
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You know...the belt connected to the big fan in front
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Old 02-26-2019, 10:35 AM
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The only ?sludge? removal requirement I am aware of is a Lycoming AD for non ?PID? stamped hollow cranks to inspect for corrosion (pitting) on 320 and 360 engines. Not sure there is a required interval, or even a recommended practice, for sludge removal. Engine gurus?
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  #6  
Old 02-26-2019, 10:36 AM
Bavafa Bavafa is offline
 
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I guess we are talking about the alternator belt then, right?
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  #7  
Old 02-26-2019, 11:33 AM
scsmith scsmith is offline
 
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Default

I seem to recall a recommendation of 500 hrs somewhere in Lycoming literatature, but I can't remember where. I could be imagining it.

I didn't know anything about the sludge at 300 hrs when my prop came off to re-seal it. OMG, I thought. So I read up on it, and I think that is where I came across it.

One of the thoughts I had was, YUK! If there is sludge here, what about elsewhere? I think the unique thing about the crank is the high centrifugal load that probably slings the sludge out rather than keeping it in suspension.

My other thought was, "this is engine oil. The only exposure to lead would be from blow-by during combustion. How is there so much?"

Back in the days of leaded fuel for cars, I used to find similar grey sludge deposited in various parts of the engine. Getting rid of this will be a nice side-benefit when they eliminate lead from our avgas.
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  #8  
Old 02-26-2019, 11:51 AM
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Mike S Mike S is online now
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Quote:
Originally Posted by scsmith View Post
I think the unique thing about the crank is the high centrifugal load that probably slings the sludge out rather than keeping it in suspension.
Old Honda motorcycle engines used to have a "can" bolted to the end of the crank, just for this purpose.



Worked quite well, but needed regular service/cleaning.



Imagine what our engines would have in the crank if we did not also have a real oil filter??
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Old 02-26-2019, 06:25 PM
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Quote:
Originally Posted by Bavafa View Post
I guess we are talking about the alternator belt then, right?
Yep. I guess maybe I'm dating myself calling it a fan belt. I remember having many old cars were the fan belt actually drove a fan.
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  #10  
Old 02-26-2019, 06:59 PM
greghale greghale is offline
 
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I cycle my prop a couple of times before shutting down. This replaces the sludge with clean oil. This was a suggestion from the war birds on the field.
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