The New And Improved Unofficial R65 Forum V2
Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: Adamastor on March 22, 2010, 12:20:21 PM
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Hi there!
I was wondering... does the R65 have these drain holes? (https://bmwr65.org/smf/proxy.php?request=http%3A%2F%2Fwww.bmwscotter.com%2Fprocedures%2Foil_breather_service%2Fsettling_chamber.jpg&hash=1fff39bce3b2f9e861572ddabbf401d1a9f847d6)
Regards,
Sergio
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Can't say I've ever seen it for real but that looks to me like the drain hole associated with the engine breather for allowing condensed vapour to drain back into the crankcase. Later bikes are supposed to have this so that should include the R65. I've been meaning to take a look to make sure it isn't blocked and also to check the breather pipes are clear. A job to do when the fuel rank runs low.
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I've never seen a cutaway of the engine case of an R65 engine .
The engine has a breather valve on top, under the cover over the starter .
Been a while since I've been in there, can't say for sure if it has any return drain holes or not .
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I Just checked mine, it doesnt... the breather itself is of the reed type (the newer) but the breather cap is small, has only two bolts (the ones with drain hole are supposed to have three) and no drain hole.
It is a pitty because I still have high oil consumption and was looking for another reason to justify it..
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Is there oil dripping out of the carbs, another source of oil consumption, is the crankcase breather .
There is a fair amount of atomized oil coming out of the breather, and it goes right into the carb intake 'horns' inside the airbox .
I read in the Airheads Beemer Club monthly newsletter about 15 years ago, that adding a small portion of a copper pot scrubbing pad to the cavity area above the reed valve in the breather housing, would reduce oil consumption, as the atomized oil can collect on the copper pad, and get returned to the oil sump, instead of being drawn into the intake system, or puddle in the airbox .
Other members here have mentioned, that if they keep topping off the oil quantity to the full mark, the bike seems to consume more than a normal amount of oil .
Try keeping the oil level at the mid-way between full and add, and see if that helps reduce the oil consumption .
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Hmmm interesting that mod. Last sunday I have done a 300miles ride and my oil dipstick went from middle to minimum (that's about half a litter).
It is a very high consumption, almost like a 2T engine. I am doing the piston rings break-in, could it be the only reason for this? Another weird thing was that, the first half of the ride the consumption was very low (I checked the oil level at middle of the ride just to be safe, and it was just a little bellow middle).
Some parts of the ride were a bit hilly, can this explain all this consumption?
Many regards and thanks for helping on my unstoppable wave of questions :) Learning is good ehe
I will post some photos of the ride so I can pay back a bit ;)
Sergio
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Hmmm, I do see oil goes to the carburator inlet, I really cant quantify if it is too much, maybe it is.
Can you please explain me better (or do you have any link) how that copper mod works?
Thanks :)
And here a link to the ride photos:
http://www.bmwr65.org/cgi-bin/yabb2/YaBB.pl?num=1269290170
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Don't have link, as it was explained in the article, the air coming out of the breather valve, contains a fine mist of oil, with the copper pad installed, the air goes through the pad, and the oil mist collects on the strands of copper, and then when enough collects, it runs down to the breather valve, and then seeps back into the oil sump when the engine is shut down .
There may be a slight vacuum develop in the crankcase when the engine cools off, and the oil is drawn back into the engine via the breather system .
But that's only a guess !!!
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Could this be a copper pad like those used on electronic kits:
(https://bmwr65.org/smf/proxy.php?request=http%3A%2F%2Fwww.westfloridacomponents.com%2Fmm5%2Fgraphics%2F00000001%2Fperf-board-xl.jpg&hash=2e27840d22af3b3c0b23582255c574bccce03ce1)
Sergio
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No, what was called out for in the article, was a common pot scrubbing pad made of shredded copper a lot coarser 'strands' than steel wool, used to clean dishes, and cooking pots .
You get them at a grocery store or similar retail outlet .
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On the Airheads Beemer Club list, I recall -I think, anyway- that some peeps were modifying the crankcase breather system in a way to eliminate the oil mist entering the carbs. I'm considering doing the same thing with some tubing and a small, concealed catch can.
Fairly common on hotrod engines / aircraft engine installs I've seen.
Monte
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I just found this:
For an old Airhead, greater than 2000 miles per quart.
For a bike with new rings that isn't been broken in yet, greater than 500 miles per quart.
in here:
http://www.bmwscotter.com/topics/engine_oil/engine_oil.htm#normal_oil_consumption
And got bit less worried about the oil consumption... maybe it's just normal consumption related to new rings. Nikasil cylinders make for a long time break-in, right?
Regards,
Sergio
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Going back to your original picture of the drain hole.
I think it is item 22 and I'm not sure you would be able to see it easily.
(http://)
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Hi Barry, the hole is located on a cavity under the breather valve case. It only exists on some models, mine only has the breather valve under the case and it is quite small..
Anyone knows if it is located in some other place?
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Adamastor
The oil diagram came from this document originally published in early 1979. It describes the breather function and return of condensed oil vapour via that drain hole
http://www.omnilex.com/public/bmw78/boxloob.pdf
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Although my engine is later than 1979, maybe R65 engines didn't have that hole. I know I opened the breather chamber case and didn't see anything but the breather it-self.
Has anyone seen one of those on a R65? Please don't make me go there again :)
I also found this:
The cases with this breather hole are easily identified. If the oil breather housing cover has just two bolts, the engine case doesn't have the oil cavity and breather hole. If the housing cover has three bolts, then you DO have the breather hole.
from here: http://bmwscotter.org/procedures/oil_breather_service/oil_breather_service.htm
My housing cover has only 2 bolts.
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Adamastor
The oil diagram came from this document originally published in early 1979. It describes the breather function and return of condensed oil vapour via that drain hole
http://www.omnilex.com/public/bmw78/boxloob.pdf
Hey Barry - check it out! I put you in the FAQ section!
http://www.bmwr65.org/cgi-bin/yabb2/YaBB.pl?num=1269537890/0
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Although my engine is later than 1979, maybe R65 engines didn't have that hole. I know I opened the breather chamber case and didn't see anything but the breather it-self.
Has anyone seen one of those on a R65? Please don't make me go there again :)
I also found this:
The cases with this breather hole are easily identified. If the oil breather housing cover has just two bolts, the engine case doesn't have the oil cavity and breather hole. If the housing cover has three bolts, then you DO have the breather hole.
from here: http://bmwscotter.org/procedures/oil_breather_service/oil_breather_service.htm
My housing cover has only 2 bolts.
Sergio, I don't have an answer for you, I am sorry.
But thank you for the neat website link! I don't think I have that in my collection.
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Hey Barry - check it out!I put you in the FAQ section!
http://www.bmwr65.org/cgi-bin/yabb2/YaBB.pl?num=1269537890/0
Thanks Rob.
You can understand why I recently took an interest in the lubrication system.
Adamastor
That's an excellent link to the breather service article. I had seen it before but it seems to have been substantially revised since then. I don't remember seeing the drain hole either but I'm going to have a look again when I get the chance. I'm getting the impression that there may be 2 drain holes. 1 internal that you can't see and 1 close to the breather disc which only some engines have.
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Glad you liked it, Barry and Rob.. it is strange that R65s don't have this drain hole, but it looks like it ain't there..
All of those with extra R65 engines out of the frame, or who are doing some work on the engine could just take a look and confirm if it exists?...
Regards,
Sergio
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Does one have to pull the flapper valve out of the block to see it?
If so, I am NOT going there! Maybe on my dead engine, next week, when I am off work.
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Apparently you just have to open the breather valve case (unscrew it and look inside). No need to take out the valve it-self (it ain't easy to do that).. At least that's what I did... it is a 10 min job at max..