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Old 12-01-2011, 06:21 PM   #16
Bill Harris OP
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Jim, 'Shaft, 'Wire--

This is going to be a lively topic. It's beyond "use a drilling guide and clean out the rocker oil supply holes".

I've posted a link to this thread on The Airlist and have already gotten responses. I'll bet that 'Bum will get involved-- I won't know right away since I'm on Digest Mode there. I've notified other "Guru's Of Note on this topic, too.

Dis be a can o'worms...
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Old 12-01-2011, 06:42 PM   #17
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Let us know what they say. Personally, I don't think there is a can of worms here if you vacuum clean the oiling system. It works perfectly as far as I can tell. The chips are super light weight and are easily picked up with a good shop vacuum. Flushing and blowing isn't the answer here.
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Old 12-02-2011, 08:50 PM   #18
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Why exactly does everyone wait to hear what snowbum says?
I'm not ever sure, every time this kind of stuff comes up.
Luckily for me, I was never much into hero worship, religion, government etc.
Bill, I think that you're heading down the right path with the information and tools that you currently have and you seem extremely savvy in the way of mechanical systems. Go forth and prosper I say!
Damn the torpedoes, full speed ahead.
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Old 12-02-2011, 09:07 PM   #19
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Quote:
Originally Posted by wirewrkr View Post
why exactly does everyone wait to hear what snowbum says?
I'm not ever sure, every time this kind of stuff comes up.
Luckily for me, i was never much into hero worship, religion, government etc.
Bill, i think that you're heading down the right path with the information and tools that you currently have and you seem extremely savvy in the way of mechanical systems. Go forth and prosper i say!
Damn the torpedoes, full speed ahead.

+1 There is so much crap from the so called "gurus" just think for yourself and use common sense and make it happen.
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Old 12-02-2011, 09:13 PM   #20
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Posting at certain places one really has no idea what to expect-- I just tossed it out there for "peer review".

Posting here, I incorporated enough keywords so it'll show up in any Search relating to Airhead cylinder stud repair. I don't think that the oil passage by itself is a problem, but ignoring or not being aware of it is THE major problem.
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Old 12-03-2011, 12:11 PM   #21
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+1 wirewrker and robtg.

Dangerous talk around here but it needs to be said way more often. I am glad you guys are doing it this time!
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Old 12-06-2011, 09:12 PM   #22
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+1 wirewrker and robtg.

Dangerous talk around here but it needs to be said way more often. I am glad you guys are doing it this time!
I guess we're not on " double secret probation" yet.
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Old 12-06-2011, 09:52 PM   #23
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I guess we're not on " double secret probation" yet.
" double secret probation"? Ok, i'm in, how do we get there?
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Old 12-07-2011, 09:27 AM   #24
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" double secret probation"? Ok, i'm in, how do we get there?
First ya gotta rent the movie " Animal House" and watch it while consuming large quantities of beer.
Oh wait, neither one of us does that anymore.................
Oh well, we're past the point of needing Booze to be socially unacceptable reprobates.
It just comes natural to some of us.
Storm the Bastille!
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Old 12-07-2011, 12:28 PM   #25
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Originally Posted by wirewrkr View Post
First ya gotta rent the movie " Animal House" and watch it while consuming large quantities of beer.
Oh wait, neither one of us does that anymore.................
Oh well, we're past the point of needing Booze to be socially unacceptable reprobates.
It just comes natural to some of us.
Storm the Bastille!
7/14. You gotta love Bastille Day! My kind of Holiday.

Count me in as usual.
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Old 12-07-2011, 03:46 PM   #26
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Pure coincidence...watch AH last night with a couple good scotches

Billy mentioned the BMW coil...it's longer and more robust than the standard O'Reilly's, Pep Boys stuff. I did 2 engines last week and another one scheduled for tomorrow. Not as many as some true mechanics on the list but out of around 40 cases over the years..never had a BMW version come out.
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Old 12-26-2013, 08:41 AM   #27
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backflushing

First timer here doing this, I think I understand most of this thread, but do have a question.

I am repairing a top right stud on the left cylinder of an R75/5 ('73).

How would I go about backflushing it with oil. I took off the oil pressure sender and pressurizesd there, but all I got was air (I think), did not see any oil come out of there. The rest of the engine is intact and I do have the motor topped off with oil. (I guess I don't completely understand the oiling system)

Advice would be much appreciated.

Scott
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Old 12-26-2013, 10:07 AM   #28
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Hot oil will drain down, at least I think that's what applies here. So when you pressurized the oil pressure switch hole you didn't get much of anything because it was essentially empty. Take an oil squirt can, prime the oil pressure switch hole and follow with air. Now you should see the oil coming out that you primed the hole with.
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Old 12-26-2013, 12:49 PM   #29
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Originally Posted by strichzwei View Post
How would I go about backflushing it with oil. I took off the oil pressure sender and pressurizesd there, but all I got was air (I think), did not see any oil come out of there.
Unless you turn the crank just so, the oil feed is sealed off. There is a small notch in the crank that allows a pulse of oil to the rockers as it passes by the feed hole in the bearing. Looking at a crank I have here, the notch is on top when the crank is at BDC, so rotate it about 60 toward whichever cylinder you're working on to allow it to open the feed hole.

Haven't done this myself, but that is how I see it.
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Old 12-26-2013, 02:16 PM   #30
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+1. I wouldn't count on getting all that lined up properly to work very well. Like I have said earlier, I think the best way to get the chips out is to vacuum them out the same way they went in. Blowing them out can't work very well for how the oil gets there to start with and blowing them through is an even worse idea. Aluminum chips are very light. Left on their own with no oil or grease to get them stuck where ever, they will come right out with a good strong vacuum. I do use some grease on my tap but I keep in mind what I just said about keeping the chips clean so they won't get stuck where ever they might end up before getting vacuumed out. My advise is to try and do it right. I have seen a number of engines lunched for a bunch of those chips going through the oiling system.

supershaft screwed with this post 12-26-2013 at 02:25 PM
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