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  #11  
Old 19th August 2018
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The Piston looks like oil starvation, too slow of an idle? I always idle mine a little fast, so the pistons get lots of oil.

The lifter damage is due to a lack of oil or oil contamination (gas) or oil breakdown (heat).

They don't call me Ironhead Rick just because I'm hard headed
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The thing that gets to me is it looks like nobody else so far has seen a hole through that screen. I mean it was almost as big around as a dime...that's a lot of bird shot in the gear case...and trans, which might help explain the cracked c/s boss...I'm kicking myself that I didn't keep it so y'all could see it.
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  #13  
Old 19th August 2018
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A hole in that screen would have to have been made by the screen getting wadded up or pushed into the rotating breather valve.

Was there damage to the breather valve or the bore of the sleeve? Like it had been eating at the screen?

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Old 19th August 2018
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i cannot visualize anything requiring that screen. if something gives in the cam case, there is plenty of void for it to settle. as far as coming from the trap, the hole from the c/c trough is not very big and even if something could go through it, the trap has plenty of void space to contain it.
i have seen the screen dissolved however, not worn out. i believe the issue to be acid oil. when a machine sits up long periods, moisture in the oil can become acidic and since this screen sees moisture laden blowby, makes sense.
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Old 19th August 2018
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Quote:
Originally Posted by ryder rick View Post
A hole in that screen would have to have been made by the screen getting wadded up or pushed into the rotating breather valve.

Was there damage to the breather valve or the bore of the sleeve? Like it had been eating at the screen?

They don't call me Ironhead Rick just because I'm hard headed
I won't have the case in front of me for a while...I too was thinking the screen hit that rotating valve...the pump dissassembled hard as if it had been together for a long time with the old gaskets kinda sticking it together...but the engine would have had to come out so they could put the new pistons in, so poss. they took the pump out to look it over and didn't use assembly grease to hold the screen in while they put the pump back in, and it shifted and got a hole worn in it...the steel top of the pump was stuck fast to the case I do remember that...the cover screws were worn like it had been apart in the past...

I think the oil flows out the top of that valve like a fountain and a bit of the screen went between the rear intake tappet wheel and the cam lobe and broke that tappet wheel bearing...also the cam needle bearing is damaged there...Imma have to look over all the cam gears very carefully...the lobe on the rear intake is damaged of course so I got an ebay one for there...

Also I will probably have to do the magic marker ink test trick on all those gears...I know I plan to do it to the tranny gears (Which is getting at least 3 new ones anyway)
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Quote:
Originally Posted by bustert View Post
i cannot visualize anything requiring that screen. if something gives in the cam case, there is plenty of void for it to settle. as far as coming from the trap, the hole from the c/c trough is not very big and even if something could go through it, the trap has plenty of void space to contain it.
i have seen the screen dissolved however, not worn out. i believe the issue to be acid oil. when a machine sits up long periods, moisture in the oil can become acidic and since this screen sees moisture laden blowby, makes sense.
hmmmmm yeah in 46 years that screen could dissolve...note to self: keep oil changed

sounds like a likely scenario considering it didn't, to me, look like the pump had ever been taken out.

I will *probably* put a new screen in there then, as long as I know how they go bad...I do have assembly grease coming in the mail...

Or I might not...but a poster did mention that he'd seen bits get into the valve due to a screen not being installed there...shut off engine, circulating crap in the oil could settle in there...
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Old 20th August 2018
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well, upgrade the screen to stainless steel.
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  #18  
Old 20th August 2018
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Moon Wolf posed the same question. I'm not sure what the final decision was.

http://xlforum.net/forums/showthread.php?t=490378
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